CN103806890B - Obtain the method for fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method - Google Patents
Obtain the method for fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method Download PDFInfo
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Abstract
The present invention relates to a kind of method obtaining fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method, after utilizing geostatic stress and seismic data determination fracture extension direction exist favourable Reservoir Body, comprise following operation: determine that required transformation dummy joint is long according to the distance between Reservoir Body and pit shaft; Under the long prerequisite determined of required seam, then calculate applicable discharge capacity be issued to this seam long needed for fracturing fluid consumption; To lose activity required time-optimized acid solution discharge capacity according to acid solution, sour rock optimum contacting time determination acid solution consumption when obtaining maximum flow conductivity in conjunction with different blocks acid-etched fracture.The method provides reliable basis for design, efficient and while building productive rate in the construction of raising acid fracturing, reduces unnecessary fluid waste as far as possible.
Description
Technical field
The present invention relates to oil-gas field development technical field, be specifically related to a kind of method obtaining fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method.
Background technology
Tarim Basin is mainly seam hole type carbonate oil-gas reservoir, and acid fracturing is the Main Yield-increasing measure of this type of reservoir exploitation, and system in Tahe Oilfield at present annual acid fracturing wells reaches about 300 mouthfuls.
Conventional carbonate reservoir acid fracturing design method continues to use the design concept of sandstone fracturing, that is: with production capacity or maximization of economic benefit for target, by software simulation, determine optimum liquid scale and discharge capacity etc., the parameters such as the seam obtaining thus simulating is long.The main Reservoir Body of system in Tahe Oilfield fracture-cavity type carbonate reservoir is corrosion hole, major alterations technique is that (fracturing fluid is mainly used in making seam for the compound acid fracturing of fracturing fluid+acid solution, acid solution kluftkarren wall produces certain flow conductivity), acid fracturing is to link up around pit shaft favorable reservoir body for target, first must determine that much seams are long in conjunction with seismic data and can lead to Reservoir Body by ditch, fracturing fluid scale and construction parameter etc. are determined in simulation further more thus.Therefore, this method for designing inapplicable system in Tahe Oilfield fracture-cavity type carbonate reservoir, must explore a kind of acid fracturing design method being suitable for stitching hole type Carbonate Reservoir newly.
Summary of the invention
Effective time when the present invention's dissimilar acid solution that experimentally room records loses activity at different temperatures, bonding crack is wide, it is high to stitch and the long parameter of dummy joint and different displacements data obtain the EFFECTIVE RANGE of dissimilar acid solution under different temperatures and discharge capacity, optimizes acid solution discharge capacity; Sour rock optimum contacting time when the oil field different blocks acid-etched fracture that experimentally room records obtains maximum flow conductivity and the acid solution discharge capacity optimized determine best acid solution consumption.
The technical problem that the present invention solves is, a kind of method obtaining fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method is provided, for acid fracturing design provides reliable basis, efficient and while building productive rate in the construction of raising acid fracturing, reduce unnecessary fluid waste as far as possible.
For solving the problems of the technologies described above, according to the distance between Reservoir Body and pit shaft, first the present invention determines that required transformation dummy joint is long; Under the long prerequisite determined of required seam, then simulation obtain applicable discharge capacity be issued to this seam long needed for fracturing fluid consumption; To lose activity required time-optimized acid solution discharge capacity according to acid solution, sour rock optimum contacting time determination acid solution consumption when obtaining maximum flow conductivity in conjunction with different blocks acid-etched fracture; Utilize high temperature deep well Carbonate Reservoir down-hole micro-seismic monitoring acid fracturing construction crack form, and for revising well designed method.
Specifically, the concrete technical scheme that the present invention adopts is, a kind of method obtaining fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method, and the method comprises following operation:
1) distance between Reservoir Body and pit shaft is defined as minimum transformation dummy joint long;
2) well head pressure under different fracturing fluid discharge capacity is calculated by formula 1,
P
well head=P
extend+ P
frictional resistance-P
fluid column(1)
Wherein, P
well headfor the well head pressure calculated, unit is MPa,
P
extendfor stitching high extending pressure, P
extend=stratum extending pressure gradient × depth of reservoirs, unit is MPa,
P
fluid columnfor fluid column gravity in oil pipe, P
fluid column=fluid density × acceleration of gravity × liquid-column height, unit is MPa,
P
frictional resistancefor pipe friction pressure, P
frictional resistance=pipe friction factor × pipe range, unit is MPa;
By the well head pressure under the different fracturing fluid discharge capacities calculated, select the fracturing fluid displacement data group of well head pressure within the scope of well head pressure-bearing of calculating;
3) from operation 2) fracturing fluid displacement data group, to meet according to the dummy joint length that fracturing fluid discharge capacity is corresponding and be greater than operation 1) the long condition of the minimum transformation dummy joint of gained, select maximum fracturing fluid discharge capacity to be best fracturing fluid discharge capacity, dummy joint corresponding to this best fracturing fluid discharge capacity be long, stitch wide and seam is high for long, the best seam of best dummy joint is wide and best seam is high;
4) by operation 3) high, the best seam of long, the best seam of best dummy joint that obtains is wide, calculates acid solution discharge capacity according to formula 2,
Q=L
dummy joint× S
crack/ T
acid solution(2)
Wherein, Q is acid solution discharge capacity, and unit is m
3/ min,
L
dummy jointfor operation 3) the best dummy joint determined is long, and unit is m,
S
crackfor the total cross-sectional area in double-vane crack, S
crackhigh × best seam of=2 × best seam is wide, and unit is m
2,
T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min;
5) acid solution consumption is calculated by formula 3,
M
acid solution=Q × T
contact(3)
Wherein, M
acid solutionfor acid solution consumption, unit is m
3,
Q is acid solution discharge capacity, and unit is m
3/ min,
T
contactfor rock optimum contacting time sour in real well, unit is min.
The method of fracturing fluid consumption and acid solution consumption in aforesaid acquisition fractured-vuggy reservoir acid fracturing method, wherein, operation 5) in, described acid solution is gel acid, cross-linked acid or the acid that becomes sticky.
The method of fracturing fluid consumption and acid solution consumption in aforesaid acquisition fractured-vuggy reservoir acid fracturing method, wherein, operation 4) described in acid solution required time that loses activity under the reservoir temperature of wellblock be that hydrochloric acid loses activity the required time under the reservoir temperature of wellblock, its assay method is: according to the chemical reaction equation of hydrochloric acid and calcium carbonate, under measuring wellblock reservoir temperature, acid solution reacts the Δ m of poor quality of front and back rock beam by rock beam in guiding gutter and groove, the hydrochloric acid mole calculating consumption is 2 Δ m/100, calculates the rear acid solution molar concentration of reaction by formula 4:
C=(C
initially× Q ' × t-2 Δ m/100)/(Q ' × t) (4)
Wherein, C is acid solution molar concentration after the reaction t time, and unit is mol/L;
C
initiallyfor reacting front acid solution molar concentration, unit is mol/L;
Acid solution discharge capacity when Q ' is for testing, unit is L/min;
T is the reaction time of acid solution and rock beam, and unit is min;
Δ m is the of poor quality of rock beam before and after acid solution is reacted by rock beam in guiding gutter and groove, and unit is g;
By formula 4 acquired results, calculate acid solution according to formula 5 and lose activity the required time under the reservoir temperature of wellblock:
T/T
acid solution=(C
initially-C)/(C
initially-C
lost efficacy) (5)
Wherein, T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min;
C is acid solution molar concentration after the reaction t time, and unit is mol/L;
C
initiallyfor reacting front acid solution molar concentration, unit is mol/L;
C
lost efficacyacid solution molar concentration during for losing efficacy, unit is mol/L;
T is the reaction time of acid solution and rock beam, and unit is min.
The method of fracturing fluid consumption and acid solution consumption in aforesaid acquisition fractured-vuggy reservoir acid fracturing method, wherein, operation 5) described in real well the preparation method of sour rock optimum contacting time be:
1) the flow conductivity data group of sour rock when time of contact is 10min, 30min, 45min, 60min under the effective clossing pressure in acquisition wellblock, its preparation method is: contact after 10min, 30min, 45min, 60min by rock beam with acid solution, the flow conductivity of test rock beam;
2) effective clossing pressure of real well is calculated by formula 6,
P
closed=G
closed× H
reservoir-H
reservoir/ 100 × F
stratum(6)
Wherein, P
closedfor effective clossing pressure of real well, unit is MPa,
G
closedfor clossing pressure gradient, unit is MPa/m,
H
reservoirfor depth of reservoirs, unit is m,
F
stratumfor reservoir pressure coefficient;
3) effective clossing pressure of the real well calculated according to formula 6, select from flow conductivity data group the effective clossing pressure in wellblock identical with effective clossing pressure of real well or obtain maximum flow conductivity closest to the acid-etched fracture under condition time time of contact be sour rock optimum contacting time.
The method of fracturing fluid consumption and acid solution consumption in aforesaid acquisition fractured-vuggy reservoir acid fracturing method, wherein, when carrying out acid fracturing construction, adopts 31/2 " oil pipe and 27/8 " oil pipe.
The present invention is directed to the particularity of system in Tahe Oilfield seam hole type Carbonate Reservoir, propose a kind of design concept and the method that obtain acid solution consumption in the type Carbonate Reservoir acid fracturing method of seam hole, and adopt high temperature deep well Carbonate Reservoir down-hole micro-seismic monitoring acid fracturing construction crack form, for revising well designed method.The method is that the acid fracturing design of seam hole type Carbonate Reservoir provides foundation, not only can improve acid fracturing and constructs efficient and build productive rate, can also reduce unnecessary fluid waste.
According to the distance between Reservoir Body and pit shaft, the present invention determines that required transformation seam is long, under the long prerequisite determined of required seam, and the fracturing fluid scale that simulation is required under obtaining applicable discharge capacity; To lose activity required time-optimized acid filling discharge capacity according to acid solution, sour rock optimum contacting time determination acid solution consumption when obtaining maximum flow conductivity in conjunction with different blocks acid-etched fracture, preferably provides a kind of foundation newly for acid solution consumption again.
Accompanying drawing explanation
Fig. 1 is favorable reservoir body distribution map near S72-17 well wellblock.
Fig. 2 is the acid fracturing fracture pattern that monitors of S72-17 well and orientation.
Detailed description of the invention
Conventional seam hole type Carbonate Reservoir acid fracturing method is that Optimizing Reconstruction seam is long using production capacity or maximization of economic benefit as target, and determines Optimum Fracturing liquid consumption under prerequisite transformation seam is long, causes unnecessary fluid waste.
According to the distance between Reservoir Body and pit shaft, first the present invention determines that required transformation dummy joint is long; Under the long prerequisite determined of required seam, the fracturing fluid consumption that simulation is required under obtaining applicable discharge capacity; To lose activity required time-optimized acid solution discharge capacity according to acid solution, sour rock optimum contacting time determination acid solution consumption when obtaining maximum flow conductivity in conjunction with different blocks acid-etched fracture; Utilize high temperature deep well Carbonate Reservoir down-hole micro-seismic monitoring acid fracturing construction crack form, and for revising well designed method.The method not only can improve acid fracturing and constructs efficient and build productive rate, can also reduce unnecessary fluid waste.
The method of fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method is obtained, to set forth the feature of the method applied in the present invention and to prove effect of the present invention the following detailed description of the present invention.
According to the method for fracturing fluid consumption and acid solution consumption in acquisition fractured-vuggy reservoir acid fracturing method of the present invention, after utilizing geostatic stress and seismic data determination fracture extension direction exist favourable Reservoir Body, comprise following operation:
1) distance between Reservoir Body and pit shaft is defined as minimum transformation dummy joint long.
2) by P
well head=P
extend+ P
frictional resistance-P
fluid columncalculate the well head pressure under different fracturing fluid discharge capacity, wherein, P
well headfor calculative well head pressure, unit is MPa.P
extendfor stitching high extending pressure, P under different fracturing fluid discharge capacity
extend=stratum extending pressure gradient × depth of reservoirs, unit is MPa.Stratum extending pressure gradient and depth of reservoirs are the intrinsic parameter in stratum, can be measured obtain by existing routine techniques.
P
fluid columnfor fluid column gravity in oil pipe, P
fluid column=fluid density × acceleration of gravity × liquid-column height, unit is MPa.
P
frictional resistancefor pipe friction pressure, P
frictional resistance=pipe friction factor × pipe range, unit is MPa.
Here " different fracturing fluid discharge capacity " refers to empirically, selects suitable one group of fracturing fluid discharge capacity, such as 4.5m
3/ min, 5.0m
3/ min, 5.5m
3/ min, 6.0m
3/ min etc., then bring into respectively in above-mentioned formula and calculate, draw well head pressure respectively.By the well head pressure under the different fracturing fluid discharge capacities calculated, select the fracturing fluid discharge capacity composition fracturing fluid displacement data group of well head pressure within the scope of well head pressure-bearing of calculating.Pipe friction factor can be obtained by conventional method, as adopted Ч e р н и к и н, method (Ч e р н и к и н, the A.B. of A.B..The calculating of the pipeline hydraulic coefficient of friction resistance, Oil & Gas Storage, 1999,18(2) 26-28) in method calculate, also can calculate according to the method in " calculating falls in HG/T20570.7-95 pipeline pressure ".
In operation 3) front, need to consider the need of control seam high according to wellblock water body development situation, be specially: 1) if wellblock water body agensis, do not consider that control seam is high, then within the scope of well head pressure-bearing, improve fracturing fluid discharge capacity as far as possible, because fracturing fluid discharge capacity is larger, the seam obtained under identical fracturing fluid consumption is longer, and the fracturing fluid consumption required when reaching set seam and being long is less; 2) if wellblock water body development, then under the prerequisite of clear and definite oil-water interfaces, the fracture height under simulation different displacements extends situation, guarantee to stitch high extension not ditch lead to bottom water body, grow up under the prerequisite that minimum transformation dummy joint is long meeting dummy joint, select high fracturing fluid discharge capacity to construct as far as possible.
3) from operation 2) fracturing fluid displacement data group, to meet according to the dummy joint length that fracturing fluid discharge capacity is corresponding and be greater than operation 1) the long condition of the minimum transformation dummy joint of gained, select maximum fracturing fluid discharge capacity to be best fracturing fluid discharge capacity, dummy joint corresponding to this best fracturing fluid discharge capacity be long, stitch wide and seam is high for long, the best seam of best dummy joint is wide and best seam is high.
Dummy joint in fracturing fluid displacement data group under each fracturing fluid discharge capacity is grown, it is wide to stitch, seam high pass conventional method can calculate, such as, adopt " fracturing design value computational methods " (Wang Hongxun, Zhang Shicheng.Petroleum industry publishing house) method of 178-188 page, calculate the method for crevice volume rate of change and following formula according to " fracturing design value computational methods " 184 pages, calculate dummy joint long, stitch wide, stitch high:
Also conventional software can be adopted in addition to simulate, and the dummy joint obtained in fracturing fluid displacement data group under each fracturing fluid discharge capacity is grown, it is wide to stitch, it is high to stitch, and such as, in a detailed description of the invention, intends three-dimensional FRACTURING DESIGN computational methods and obtain in employing FracproPT software.The parameter wherein related to, such as fracturing fluid friction, the change of fracturing fluid stream, fracturing fluid leak etc., formation temperature, degree of porosity, permeability etc., and the parameter such as reservoir stress, young's modulus of elasticity, poisson's ratio, fracture toughness all adopts prior art conventional method to obtain.
4) by operation 3) high, the best seam of long, the best seam of best dummy joint that obtains is wide, according to Q=L
dummy joint× S
crack/ T
acid solutioncalculate acid solution discharge capacity, wherein, Q is acid solution discharge capacity, and unit is m
3/ min, L
dummy jointfor operation 4) the best dummy joint determined is long, and unit is m, S
crackfor the total cross-sectional area in double-vane crack, S
crackhigh × best seam of=2 × best seam is wide, and unit is m
2, T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min;
Wherein, acid solution required time that loses activity under the reservoir temperature of wellblock is hydrochloric acid and loses activity the required time under the reservoir temperature of wellblock, its assay method is: according to the chemical reaction equation of hydrochloric acid and calcium carbonate, under measuring wellblock reservoir temperature, acid solution reacts the Δ m of poor quality of front and back rock beam by rock beam in guiding gutter and groove, the hydrochloric acid mole calculating consumption is 2 Δ m/100, by C=(C
initially× Q ' × t-2 Δ m/100)/(Q ' × t) calculate the rear acid solution molar concentration of reaction, in conjunction with t/T
acid solution=(C
just begin-C)/(C
initially-C
lost efficacy) calculate acid fluid system and lose activity the required time under the reservoir temperature of wellblock, wherein, C is acid solution molar concentration after the reaction t time, and unit is mol/L, C
initiallyfor reacting front acid solution molar concentration, unit is mol/L, Q ' for testing time acid solution discharge capacity, can be arbitrary value, do not affect T
acid solutioncalculating, generally rule of thumb choose suitable acid solution discharge capacity, unit is L/min, t is the acid-rock reaction time, can be the arbitrary value in the acid-rock reaction complete time, and unit is min, T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min, C
lost efficacyfor molar concentration when acid solution lost efficacy, unit is mol/L.
5) by P
closed=G
closed× H
reservoir-H
reservoir/ 100 × F
stratumcalculate effective clossing pressure of real well, in conjunction with the flow conductivity data group of sour rock under the effective clossing pressure in wellblock when time of contact is 10min, 30min, 45min, 60min, select from data group the effective clossing pressure in wellblock identical with effective clossing pressure of real well or obtain maximum flow conductivity close to the acid-etched fracture under condition time sour rock optimum contacting time, by M
acid solution=Q × T
contactcalculate acid solution consumption; Wherein, P
closedfor effective clossing pressure of real well, unit is MPa, G
closedfor clossing pressure gradient, unit is MPa/m, H
reservoirfor depth of reservoirs, unit is m, F
stratumfor reservoir pressure coefficient; M
acid solutionfor acid solution consumption, unit is m
3, Q is operation 4) and the acid solution discharge capacity that calculates, unit is m
3/ min, T
contactfor sour rock optimum contacting time when acid-etched fracture in real well obtains maximum flow conductivity, unit is min.
Wellblock is different, and effective clossing pressure of wellblock is also different.The time of contact of acid rock is not limited to 10min, 30min, 45min, 60min, and those skilled in the art also rule of thumb can choose other different times of contact.
Operation 5) in the preparation method of the wellblock acid flow conductivity data group of rock when time of contact is 10min, 30min, 45min, 60min be: after rock beam is contacted 10min, 30min, 45min, 60min with acid solution, utilize the flow conductivity of acid-etched fracture guide instrument test rock beam under the clossing pressure of wellblock.
The method of fracturing fluid consumption and acid solution consumption in aforesaid acquisition fractured-vuggy reservoir acid fracturing method, when carrying out acid fracturing construction, adopts 31/2 " oil pipe and 27/8 " oil pipe.
The aforesaid method obtaining acid solution consumption in the type Carbonate Reservoir acid fracturing method of seam hole, gained dummy joint is long, seam is high carries out error comparative analysis with fracture pattern when utilizing down-hole micro-seismic monitoring to construct, and binding analysis result revises well designed method further.
The present invention adopt of the fracturing fluid source and consist of:
Frozen glue: adopt and tell the fracturing fluid goods that the model of breathing out down-hole technical operation sold is TH-HPG, it consists of: 0.5%HPG melon glue+1.0%LZ-1 cleanup additive+1.0%LP-1 demulsifier+0.1%LK-7 bactericide+0.02%pH value conditioning agent+0.5%LK-6 temperature stability agent+1.0%LK-8 clay stabilizer, and all the other are water; Wherein, melon glue is generally HPG.
As long as the acid solution with strong acid erosion ability all can be used for the present invention, the preferred gel acid of the present invention, cross-linked acid and the acid that becomes sticky; The composition of described gel acid, cross-linked acid and the acid that becomes sticky is respectively:
Gel acid: the model adopting Xi'an to surpass the sale of new science and technology Development Co., Ltd is the gel acid goods of CX-208, it consists of: 20%HCl+1.0%CX-208 gelling agent+2.0%YHS-2 high-temperature corrosion inhibitor+1.0%CX-307 demulsification cleanup agent+0.15%CX-301 ferrous stability, all the other are water.
Cross-linked acid: the model adopting Beijing Hongyi Enze Energy Technology Co., Ltd. to sell is the frozen glue acid goods of ECA-160, it consists of: 20%HCl+0.9% acid fracturing thickening agent-ECA-1+2.0% acid fracturing corrosion inhibiter-EEH+1.0% acid fracturing cleanup additive-EEZ+1.0% acid fracturing demulsifier-EEP+1.0% acid fracturing ferrous stability-EET+3.5% acid fracturing crosslinking agent-ECA+0.03% acid fracturing gel breaker-ECB, all the other are water.
Become sticky acid: the model adopting Sichuan beidellite oil tech Development Co., Ltd to sell is the sour goods that become sticky of BD1-11, it consists of, and: 20%HCl+0.8%BD1-11 becomes sticky sour gelling agent+2.0%BD120C high-temperature corrosion inhibitor+1.0%BD1-2 ferrous stability+1.0%BD1-3 demulsifier+1.0%BD1-5 cleanup additive, and all the other are water.
In addition, it should be noted that, those reagent being used as pH value regulator, melon glue, demulsifier, bactericide, cleanup additive, demulsification cleanup agent, temperature stability agent, clay stabilizer, crosslinking agent, gelling agent, corrosion inhibiter and ferrous stability that every this area is commonly used all can be used in the application.Such as, gelling agent can be butyl acrylate, and corrosion inhibiter can be KI, ferrous stability can be ascorbic acid, cleanup additive can be APES, and demulsifier can be SYNPERONIC PE/F68, and activator can be buserelin.Cleanup additive described in the application and demulsification cleanup agent adopt APES composed as follows usually: NPE (NPEO) accounts for 80% ~ 85%, OPEO (OPEO) accounts for more than 15%, and binonylphenol and dodecyl phenol polyethenoxy ether respectively account for 1%.
Lose activity under the reservoir temperature of the wellblock hydrochloric acid that is determined as of required time of aforementioned acid solution loses activity the required time under the reservoir temperature of wellblock, its assay method is: when it has been generally acknowledged that acid strength reaches 10% of initial concentration, namely acid solution loses activity, the application's acid solution used contains mass fraction 20%(and 6.2mol/L) hydrochloric acid, when concentration of hydrochloric acid is reduced to 2%(and 1mol/L) time acid solution lose activity.Utilize acid-etched fracture guide instrument unit simulation acid-rock reaction process, acid solution is selected from gel acid, cross-linked acid, become sticky acid, rock beam adopts Ordovician of Tahe oil to appear (carbonate content is greater than 95%), according to the chemical reaction equation of hydrochloric acid and calcium carbonate, under measuring wellblock reservoir temperature, acid solution reacts the Δ m of poor quality of front and back rock beam by rock beam in guiding gutter and groove, and the hydrochloric acid mole calculating consumption is 2 Δ m/100, by C=(C
initially× Q ' × t-2 Δ m/100)/(Q ' × t) calculate the rear acid solution molar concentration of reaction, in conjunction with t/T
acid solution=(C
initially-C)/(C
initially-C
lost efficacy) calculate acid fluid system and lose activity the required time under the reservoir temperature of wellblock, wherein, C is acid solution molar concentration after the reaction t time, and unit is mol/L, C
just beginfor reacting front acid solution molar concentration, unit is mol/L, Q ' for testing time acid solution discharge capacity, can be arbitrary value, do not affect T
acid solutioncalculating, generally rule of thumb choose suitable acid solution discharge capacity, in the reaction time of unit to be L/min, t be acid solution and rock beam, unit is min, T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min, C
lost efficacyfor molar concentration when acid solution lost efficacy, unit is mol/L.
The preparation method of the flow conductivity data group of aforementioned wellblock acid rock when time of contact is 10min, 30min, 45min, 60min is: test that acid solution used is conventional gel acid, the cross-linked acid of system in Tahe Oilfield, become sticky acid, and rock beam adopts Ordovician of Tahe oil to appear (carbonate content is greater than 95%); Rock beam is contacted certain hour (as 10min, 30min, 45min, 60min) with acid solution after, acid-etched fracture guide instrument is utilized to test rock beam flow conductivity of (as 10MPa, 20MPa, 30MPa, 40MPa) under the clossing pressure of wellblock.
When carrying out acid fracturing construction, adopt 31/2 " oil pipe and 27/8 " oil pipe, such as, can adopt 31/2 " EUE external upset tubing/31/2 " TP-JC oil pipe and 27/8 " EUE external upset tubing/27/8 " TP-JC oil pipe.
Below, enumerate embodiment and the present invention is further described, but the present invention is not limited to following embodiment.
Embodiment
To acid solution in embodiment below lose activity under the reservoir temperature of wellblock the required time the effective clossing pressure of assay method and wellblock under acid-etched fracture obtain maximum flow conductivity time sour rock optimum contacting time assay method in the device, the raw material that use be described as follows:
Acid-etched fracture guide instrument device: Hai'an oil scientific research Instrument Ltd., model is SNF-1.
Rock beam: adopt Ordovician of Tahe oil to appear, wherein carbonate content is greater than 95%.
Acid fracturing method of the present invention is described in detail below by way of to the field trial of system in Tahe Oilfield.
Embodiment 1(maintains secrecy and tests)
To system in Tahe Oilfield S72-17 well acid fracturing construction simulation
It is gel acid that system in Tahe Oilfield commonly uses acid solution, generally adopts cross-linked acid when sand pressure break is taken in needs acid, generally adopts the acid that becomes sticky to fall filter when local metafiltration is lost larger.This well intrinsic fracture is grown, and leak-off is comparatively large, and select the acid construction that becomes sticky, by mass%, it is composed as follows:
Become sticky acid: the model adopting Sichuan beidellite oil tech Development Co., Ltd to sell is the sour goods that become sticky of BD1-11, it consists of, and: 20%HCl+0.8%BD1-11 becomes sticky sour gelling agent+2.0%BD120C high-temperature corrosion inhibitor+1.0%BD1-2 ferrous stability+1.0%BD1-3 demulsifier+1.0%BD1-5 cleanup additive, and all the other are water.
In addition, it should be noted that, those reagent being used as gelling agent, demulsifier, cleanup additive, high-temperature corrosion inhibitor and ferrous stability that every this area is commonly used all can be used in the application.Such as, gelling agent can be butyl acrylate, and corrosion inhibiter can be KI, and ferrous stability can be ascorbic acid, and cleanup additive can be APES, and demulsifier can be SYNPERONIC PE/F68.Cleanup additive described in the application adopts APES composed as follows usually: NPE (NPEO) accounts for 80% ~ 85%, OPEO (OPEO) accounts for more than 15%, and binonylphenol and dodecyl phenol polyethenoxy ether respectively account for 1%.
As shown in Figure 1, S72-17 well wellblock maximum horizontal stress direction is probably 15 °, E15S(east by south), minimum level stress direction is probably 15 °, N15E(north by east), according to crack perpendicular to minimum principal stress crack initiation, this well fracture initiation direction should be E15S.Constructed from Fig. 1 the plane amplitude change rate figure of target interval, and E15S direction exists favourable Reservoir Body, and this side up Reservoir Body apart from this well shaft apart from about 77m.Fig. 2 is the acid fracturing fracture pattern that monitors of S72-17 and orientation, and its fracture extension direction is consistent with Fig. 1 fracture extension direction.
So according to above-mentioned analysis, minimum transformation dummy joint is long should be 77m.
This well depth of reservoirs is 5513m, and reservoir temperature is 125 DEG C, and reservoir intrinsic fracture grows (leak-off is large), stratum extending pressure gradient 0.0162MPa/m, clossing pressure gradient 0.0145MPa/m, reservoir pressure coefficient 1.1, water at the bottom of this wellblock growth is grown, and oil-water interfaces are probably positioned at 5548m.Oil pipe: 31/2 " 5400m+27/8 " 10m.According to P
well head=P
extend+ P
friction-P
fluid column, under can calculating different fracturing fluid discharge capacity, well head pressure is as shown in table 1 below, wherein, and P
extendfor stitching high extending pressure, P under different fracturing fluid discharge capacity
extend=stratum extending pressure gradient × depth of reservoirs, unit is MPa, P
fluid columnfor fluid column gravity in oil pipe, P
fluid column=fluid density × acceleration of gravity × liquid-column height, unit is MPa, P
frictionfor pipe friction pressure, P
friction=coefficient of pipe friction × pipe range, unit is MPa.
Well head pressure under the different fracturing fluid discharge capacity of table 1
Note: system in Tahe Oilfield acid fracturing S72-17 well well head is 105 type well heads, pressure-bearing 105Mpa.
Calculating well head pressure under the different displacements of fracturing fluid shown in table 1 is within the scope of well head pressure-bearing.
Utilize " fracturing design value computational methods " (Wang Hongxun, Zhang Shicheng.Petroleum industry publishing house) to calculate fracturing fluid discharge capacity be 5m for the computational methods of 178-188 page
3/ min and 6m
3/ min and fracturing fluid consumption are respectively 180m
3, 200m
3, 220m
3, 250m
3dummy joint under condition is grown, it is wide to stitch, it is high to stitch, and result is as shown in table 2 and table 3.
Table 2 fracturing fluid discharge capacity is 5m
3/ min and fracturing fluid consumption are respectively 180m
3, 200m
3, 220m
3, 250m
3dummy joint under condition is grown, it is wide to stitch, it is high to stitch
Table 3 fracturing fluid discharge capacity is 6m
3/ min and fracturing fluid consumption are respectively 200m
3, 220m
3, 250m
3dummy joint under condition is grown, it is wide to stitch, it is high to stitch
Water at the bottom of this wellblock growth is grown, and needs to consider that control seam is high in construction.Degree of depth 5513m in the middle part of this well construction well section, distance bottom oil-water interfaces 35m, fracturing fluid discharge capacity is 5m
3during/min, dummy joint is grown up long in minimum transformation dummy joint, and when namely dummy joint length is for 83.2m, the high 31.8m of lower seam, links up less than water body, and when fracturing fluid discharge capacity brings up to 6m
3during/min, dummy joint is grown up long in minimum transformation dummy joint, and when namely dummy joint length is for 85.4m, the high 35.9m of lower seam, ditch leads to bottom water body.Therefore preferred fracturing fluid discharge capacity 5m
3/ min, and select fracturing fluid consumption to be 220m
3, now dummy joint reaches 83.2m, meets dummy joint and grows up in the requirement of the long 77m of minimum transformation dummy joint.
When it has been generally acknowledged that acid strength reaches 10% of initial concentration, namely acid solution loses activity.The application's acid solution used contains mass fraction 20%(and 6.2mol/L) hydrochloric acid, when concentration of hydrochloric acid is reduced to 2%(and 1mol/L) time acid solution lose activity.The dissimilar acid solution determined by laboratory (preferred gel acid, cross-linked acid, become sticky acid) loses activity the required time at different temperatures, as shown in table 4.
Different acid solution effective acting time is at different temperatures determined in table 4 laboratory
This well intrinsic fracture is grown, and leak-off is comparatively large, selects the acid construction that becomes sticky.In addition, wellblock reservoir temperature is 125 DEG C, so select the effective time 20.5min of acid 125 DEG C time that become sticky.
Be 83.2m by the above-mentioned dummy joint length determined, seam height is 61.5m, and stitching wide is 1.01cm, the total cross-sectional area S in double-vane crack
crack=2 × stitch high × stitch wide, i.e. S
crack=2 × 61.5 × 1.01/100=1.24m
2.Suppose that acid solution discharge capacity is Qm
3/ min, then Q/1.24 is the linear velocity of acid solution in crack, and it is the EFFECTIVE RANGE of acid solution under Q that linear velocity is multiplied by acid solution effective time again, namely has Q/1.24 × 20.5>=83.2, obtains Q>=5.03m
3/ min, determines acid solution discharge capacity 5.5m thus
3/ min can meet construction requirement completely.
Acid (become sticky acid) rock optimum contacting time when the different blocks acid-etched fracture that laboratory is determined obtains maximum flow conductivity is as shown in table 5.
Flow conductivity under table 5 acid (become sticky acid) rock different time of contact
The effective clossing pressure of this well is: 0.0145 × 5513-55.13 × 1.1=19.3MPa.By under the known effective clossing pressure 20MPa of table 5 data, during sour rock contact 45min, flow conductivity reaches maximum.Acid solution discharge capacity is multiplied by acid (become sticky acid) rock optimum contacting time when acid-etched fracture obtains maximum flow conductivity, obtains best acid solution consumption, i.e. 5.5m
3/ min × 45min=247m
3, consider that the injection of acid solution progressively puies forward discharge capacity, during low discharge capacity, penetration range is lower, and therefore, acid solution is had more than needed 10m
3round to obtain 260m
3become sticky acid.
Simulate effect is evaluated
By analyzing above, determine this well fracturing fluid scale 220m
3, fracturing fluid operational discharge capacity 5m
3/ min; Become sticky sour consumption 260m
3, become sticky sour operational discharge capacity 5.5m
3/ min.
Fracture pattern when down-hole microseism detects the S72-17 well practice of construction obtained is as shown in table 6.
Fracture pattern during table 6 practice of construction
| Validity event | Seam group leader (m) | Seam group high (m) | Inclination angle (degree) |
| 78 | 181.25 | 53.88 | E13S |
Interpretation of result:
Fracture extension direction E13S, namely there is favourable Reservoir Body in E13S direction, substantially identical with this wellblock stress direction;
Seam group leader 181.25m, i.e. the long 90.625m of dummy joint, with design error is: (90.625-83.2)/83.2 × 100%=8.9%;
Stitch high 53.88m, with design error be: (61.5-53.88)/61.5 × 100%=12.4%.
The actual goodness of fit of method and scene that the present invention obtains acid solution consumption in the type Carbonate Reservoir acid fracturing method of seam hole is higher.
Claims (5)
1. obtain a method for fracturing fluid consumption and acid solution consumption in fractured-vuggy reservoir acid fracturing method, comprise following operation:
1) distance between Reservoir Body and pit shaft is defined as minimum transformation dummy joint long;
2) well head pressure under different fracturing fluid discharge capacity is calculated by formula 1,
P
well head=P
extend+ P
frictional resistance-P
fluid column(1)
Wherein, P
well headfor the well head pressure calculated, unit is MPa,
P
extendfor stitching high extending pressure, P
extend=stratum extending pressure gradient × depth of reservoirs, unit is MPa,
P
fluid columnfor fluid column gravity in oil pipe, P
fluid column=fluid density × acceleration of gravity × liquid-column height, unit is MPa,
P
frictional resistancefor pipe friction pressure, P
frictional resistance=pipe friction factor × pipe range, unit is MPa;
By the well head pressure under the different fracturing fluid discharge capacities calculated, select the fracturing fluid displacement data group of well head pressure within the scope of well head pressure-bearing of calculating;
3) from operation 2) fracturing fluid displacement data group, to meet according to the dummy joint length that fracturing fluid discharge capacity is corresponding and be greater than operation 1) the long condition of the minimum transformation dummy joint of gained, select maximum fracturing fluid discharge capacity to be best fracturing fluid discharge capacity, dummy joint corresponding to this best fracturing fluid discharge capacity be long, stitch wide and seam is high for long, the best seam of best dummy joint is wide and best seam is high;
4) by operation 3) high, the best seam of long, the best seam of best dummy joint that obtains is wide, calculates acid solution discharge capacity according to formula 2,
Q=L
dummy joint× S
crack/ T
acid solution(2)
Wherein, Q is acid solution discharge capacity, and unit is m
3/ min,
L
dummy jointfor operation 3) the best dummy joint determined is long, and unit is m,
S
crackfor the total cross-sectional area in double-vane crack, S
crackhigh × best seam of=2 × best seam is wide, and unit is m
2,
T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min;
5) acid solution consumption is calculated by formula 3,
M
acid solution=Q × T
contact(3)
Wherein, M
acid solutionfor acid solution consumption, unit is m
3,
Q is acid solution discharge capacity, and unit is m
3/ min,
T
contactfor rock optimum contacting time sour in real well, unit is min.
2. the method for fracturing fluid consumption and acid solution consumption in acquisition fractured-vuggy reservoir acid fracturing method according to claim 1, wherein, operation 5) in, described acid solution is gel acid, cross-linked acid or the acid that becomes sticky.
3. the method for fracturing fluid consumption and acid solution consumption in acquisition fractured-vuggy reservoir acid fracturing method according to claim 1 and 2, wherein, operation 4) described in acid solution required time that loses activity under the reservoir temperature of wellblock be that hydrochloric acid loses activity the required time under the reservoir temperature of wellblock, its assay method is: according to the chemical reaction equation of hydrochloric acid and calcium carbonate, reacted the Δ m of poor quality of front and back rock beam by rock beam in guiding gutter and groove by acid solution under the reservoir temperature of measurement wellblock, the hydrochloric acid mole calculating consumption is 2 Δ m/100, the rear acid solution molar concentration of reaction is calculated by formula 4:
C=(C
initially× Q ' × t-2 Δ m/100)/(Q ' × t) (4)
Wherein, C is acid solution molar concentration after the reaction t time, and unit is mol/L;
C
initiallyfor reacting front acid solution molar concentration, unit is mol/L;
Acid solution discharge capacity when Q ' is for testing, unit is L/min;
T is the reaction time of acid solution and rock beam, and unit is min;
Δ m is the of poor quality of rock beam before and after acid solution is reacted by rock beam in guiding gutter and groove, and unit is g;
By formula 4 acquired results, calculate acid solution according to formula 5 and lose activity the required time under the reservoir temperature of wellblock:
T/T
acid solution=(C
initially-C)/(C
initially-C
lost efficacy) (5)
Wherein, T
acid solutionfor acid solution loses activity the required time under the reservoir temperature of wellblock, unit is min;
C is acid solution molar concentration after the reaction t time, and unit is mol/L;
C
initiallyfor reacting front acid solution molar concentration, unit is mol/L;
C
lost efficacyacid solution molar concentration during for losing efficacy, unit is mol/L;
T is the reaction time of acid solution and rock beam, and unit is min.
4. the method for fracturing fluid consumption and acid solution consumption in acquisition fractured-vuggy reservoir acid fracturing method according to claim 1 and 2, wherein, operation 5) described in real well the preparation method of sour rock optimum contacting time be:
1) the flow conductivity data group of sour rock when time of contact is 10min, 30min, 45min, 60min under the effective clossing pressure in acquisition wellblock, its preparation method is: contact after 10min, 30min, 45min, 60min by rock beam with acid solution, the flow conductivity of test rock beam;
2) effective clossing pressure of real well is calculated by formula 6,
P
closed=G
closed× H
reservoir-H
reservoir/ 100 × F
stratum(6)
Wherein, P
closedfor effective clossing pressure of real well, unit is MPa,
G
closedfor clossing pressure gradient, unit is MPa/m,
H
reservoirfor depth of reservoirs, unit is m,
F
stratumfor reservoir pressure coefficient;
3) effective clossing pressure of the real well calculated according to formula 6, select from flow conductivity data group the effective clossing pressure in wellblock identical with effective clossing pressure of real well or obtain maximum flow conductivity closest to the acid-etched fracture under condition time time of contact be sour rock optimum contacting time.
5. the method for fracturing fluid consumption and acid solution consumption in acquisition fractured-vuggy reservoir acid fracturing method according to claim 3, wherein, operation 5) described in real well the preparation method of sour rock optimum contacting time be:
1) the flow conductivity data group of sour rock when time of contact is 10min, 30min, 45min, 60min under the effective clossing pressure in acquisition wellblock, its preparation method is: contact after 10min, 30min, 45min, 60min by rock beam with acid solution, the flow conductivity of test rock beam;
2) effective clossing pressure of real well is calculated by formula 6,
P
closed=G
closed× H
reservoir-H
reservoir/ 100 × F
stratum(6)
Wherein, P
closedfor effective clossing pressure of real well, unit is MPa,
G
closedfor clossing pressure gradient, unit is MPa/m,
H
reservoirfor depth of reservoirs, unit is m,
F
stratumfor reservoir pressure coefficient;
3) effective clossing pressure of the real well calculated according to formula 6, select from flow conductivity data group the effective clossing pressure in wellblock identical with effective clossing pressure of real well or obtain maximum flow conductivity closest to the acid-etched fracture under condition time time of contact be sour rock optimum contacting time.
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| CN106522935B (en) * | 2016-12-26 | 2019-04-26 | 西南石油大学 | An experimental method for determining the conductivity distribution of acid fracturing fractures in carbonate reservoirs |
| CN110359900A (en) * | 2018-03-13 | 2019-10-22 | 西南石油大学 | A kind of optimization method of carbonate reservoir acid fracturing construction parameter |
| CN111963108B (en) * | 2019-05-20 | 2022-07-05 | 中国石油天然气股份有限公司 | Method for determining acid liquor consumption in gas well blockage removal process |
| CN113565481A (en) * | 2020-04-28 | 2021-10-29 | 中国石油化工股份有限公司 | Method for exploiting reservoir bodies in fractured zone |
| CN114508338B (en) * | 2020-11-17 | 2024-08-06 | 中国石油化工股份有限公司 | Method for selecting acid liquor system for locating holes by circulating seams |
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| CN101314713A (en) * | 2008-05-08 | 2008-12-03 | 伊向艺 | Controlled Viscosity Acid Fluid System for Acid Fracturing in Carbonate Reservoirs |
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