CN108441196A - One kind is for low temperature, fracture formation underground synthesized gel rubber profile control agent and its preparation method and application - Google Patents
One kind is for low temperature, fracture formation underground synthesized gel rubber profile control agent and its preparation method and application Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 86
- 239000003795 chemical substances by application Substances 0.000 abstract description 51
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 abstract description 32
- 229920001971 elastomer Polymers 0.000 abstract description 27
- 230000015572 biosynthetic process Effects 0.000 abstract description 18
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 abstract description 17
- 229910001870 ammonium persulfate Inorganic materials 0.000 abstract description 16
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 abstract description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 14
- 238000011049 filling Methods 0.000 abstract description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000005489 elastic deformation Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- FIKFOOMAUXPBJM-UHFFFAOYSA-N hepta-2,5-dienediamide Chemical class NC(=O)C=CCC=CC(N)=O FIKFOOMAUXPBJM-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 31
- 239000000243 solution Substances 0.000 description 27
- 239000000178 monomer Substances 0.000 description 20
- 238000013019 agitation Methods 0.000 description 16
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 239000004971 Cross linker Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229920002401 polyacrylamide Polymers 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000003999 initiator Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 101150047834 SNAI2 gene Proteins 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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Abstract
The invention discloses one kind for low temperature, fracture formation underground synthesized gel rubber profile control agent, and each component and its shared mass percent include：Acrylamide monomer 6~10%, acrylic acid 1.0~2%, N.N methylene-bisacrylamides 0.02~0.03%, Ammonium Persulfate 98.5 0.06~0.1%, surplus are water.The profile control agent belongs to underground synthesized gel rubber profile control agent, its inject viscosity it is low, into generation high-strength gel can be reacted behind water breakthrough channel, gained gel has higher intensity and preferable elastic deformation characteristic, it can effectively water breakthrough caused by control critical eigenvalue (especially to unstable crack) dilatating and deformable, achieve the purpose that block water breakthrough channel, changes water drive direction, improves displacement of reservoir oil by filling water efficiency, and the manufacturing cost that is related to is low, quick construction, safe and reliable, it is environmental-friendly, there is important economy and environmental benefit.
Description
Technical field
The invention belongs to field of petroleum exploitation, and in particular to one kind is for low temperature, fracture formation underground synthesized gel rubber profile control
Agent and its preparation method and application.
Background technology
Profile control technique is a kind of control water stable yields of waterflooding oil field, yield-increasing technology, is mainly used for blocking water breakthrough channel, carry
High displacement of reservoir oil by filling water efficiency.For waterflooding oil field, once injection water to the quick water breakthrough of certain oil well, will cause waterflood,
Yield decline, aqueous raising, displacement of reservoir oil by filling water efficiency will substantially reduce, and water breakthrough problem caused by crack and macropore is especially bright
It is aobvious.
It is main problem existing for each oil field of Ordos Basin to inject water along the quick water breakthrough in crack.In order to inhibit crack water
It alters, improve waterflooding development effect.Chemical water shutoff and chemical profile control technical research are carried out in succession in each oil recovery factory of Changqing oilfields.Mainly
Based on compound displacement technology, the technology with polymer weak gel, remove native glue, Weak gel particle, based on cement, using multistage
Match, low discharge capacity, large dosage of construction technology realize that deep profile controlling, scene see certain effect.But there is also some problems：1) work
Cement mortar Duan Sai's easily causes accident, the too shallow lower part of tubing string with increasing under construction risk, tubing string to oil reservoir lower part in skill
Oil reservoir is easy to be buried dead；2) water breakthrough is unable to control for serious water breakthrough well, sensitive direction oil well can only be closed；3) it can not solve strong
Water breakthrough and the secondary water breakthrough problem of fracture propagation.Unstable characteristic is acted in pressure, it is necessary to study one for the oil fields Ping Bei microcrack
Kind high-strength high-elasticity gel profile-controlling, inhibits fracture propagation using the deformation characteristic of high-strength gel, and gel is made to make in pressure
With the crack wall surface for being close to expansion after lower compressive deformation, avoids high intensity rigidity blocking agent (morphotropism is poor) and split after pressure rising
Seam continues to continue water breakthrough phenomenon caused by expanding.
Invention content
The purpose of the present invention is being directed to the unstable crack water breakthrough in oil field, provide a kind of injection viscosity it is low, into water
The underground synthesized gel rubber profile control agent for generating high-strength gel can be reacted after altering channel, the gel is with higher intensity and preferably
Elastic deformation characteristic, can effectively water breakthrough caused by control critical eigenvalue dilatating and deformable, reach block water breakthrough channel, change water drive direction,
The purpose of displacement of reservoir oil by filling water efficiency is improved, and the manufacturing cost being related to is low, quick construction, it is securely and reliably, environmental-friendly, have important
Economy and environmental benefit.
To achieve the above object, the technical solution adopted by the present invention is：
For low temperature, fracture formation underground synthesized gel rubber profile control agent, each component and its shared mass percent include one kind：
Acrylamide monomer 6~10%, acrylic acid 1.0~2%, N.N- methylene-bisacrylamides 0.02~0.03%, Ammonium Persulfate 98.5
0.06~0.1%, surplus is water.
For different water breakthrough degree, following different optimization formulas may be selected：
1) it is directed to weak water breakthrough well, each component and its shared mass percent include：Acrylamide monomer 6~7%, acrylic acid
1.0%, N.N- methylene-bisacrylamide 0.02%, Ammonium Persulfate 98.5 0.06~0.1%, surplus are water.
2) it is directed to strong water breakthrough well, each component and its shared mass percent include：Acrylamide monomer 9~10%, propylene
2.0%, N.N- of acid methylene-bisacrylamides 0.02%, Ammonium Persulfate 98.5 0.06~0.1%, surplus is water.
3) selection initiator concentration is changed according to ambient air temperature：Amount of initiator is reduced when temperature is high controls reaction speed,
Initiator Ammonium Persulfate 98.5 generally uses 0.08%, and summer uses 0.06%, and winter uses 0.10%.
It is furthermore preferred that it is described can also add 0.02 for low temperature, in the synthesized gel rubber profile control agent prescription of fracture formation underground~
0.03% 2- acrylamide-2-methyl propane sulfonics, it is described to be used in low temperature, fracture formation underground synthesized gel rubber profile control agent, respectively
Component and its shared mass percent are：Acrylamide monomer 6~10%, acrylic acid 1.0~2%, N.N- methylene bisacrylamides
Amide 0.02~0.03%, Ammonium Persulfate 98.5 0.06~0.1%, 2- acrylamide-2-methyl propane sulfonics 0.02~0.03%, surplus
For water；Acrylamide monomer, acrylic acid, 2- acrylamide-2-methyl propane sulfonics are used cooperatively, and in crosslinking agent and initiator
Under the action of, the anti-high valence ion performance in the building-up process of gained profile control agent underground can be effectively promoted, and it is former effectively to promote stratum
The intensity of position reaction gained gel.
The profile control agent is mainly used for blocking caused crack water breakthrough in the injecting process, can effectively inhibit existing profile control technology
In be easy the rapid polymerization phenomenon caused by local concentration is excessively high, control inefficient water injection problem improves water-injection efficiency, is suitable for ground
Less than the 50 DEG C low temperature formation Profile Control in Injection Well constructions below of layer temperature；In addition, the profile control agent has preferable flexible deformation
Characteristic and intensity can be close to crack wall surface under pressure, avoid because of profile control agent after water injection pressure raising, fracture propagation
With sides of fracture emaciated face from and form new water breakthrough phenomenon.
The present invention also provides a kind of preparation methods for low temperature, fracture formation underground synthesized gel rubber profile control agent, by this
Method can be to avoid the risk polymerizeing in local concentration sudden and violent poly- and ground and pipeline caused by excessively high with liquid；The preparation side of profile control agent
Method includes the following steps：
1) it is required to weigh each component according to said ratio, acrylamide is slowly added into the water for weighing water 1/2~2/3
Monomer and acrylic acid, are uniformly mixed, and obtain monomer solution；
2) it is weighed to residue and N.N- methylene-bisacrylamides and Ammonium Persulfate 98.5 is added in water, be uniformly mixed, must hand over
Join solution；
3) add jet pump that polyacrylamide pulvis is drawn into third Agitation Tank with cementing truck, supply clear water (protection liquid
In the clear water that additionally adds) and cycle balance to get protection liquid；
4) monomer solution and crosslinker solution are uniformly mixed, obtain the underground synthesized gel rubber profile control agent, liquid is protected in injection
Afterwards, gained underground synthesized gel rubber profile control agent is injected into progress profile control processing at formation fracture to be blocked.
In said program, in the protection liquid, mass percent shared by polyacrylamide powder is 0.4~0.6%
In said program, the molecular weight of the polyacrylamide is 4,000,000~6,000,000, degree of hydrolysis 10~15%.
Profile control agent belongs to underground synthesized gel rubber profile control agent obtained by said program, to breakthrough pressure after man-made fracture reservoir core plugging
Gradient reaches 32MPa/m, and average water injection pressure rises 2MPa after field test；Polymerization reaction time is more than 7 days at 20 DEG C,
The reaction time is more than 4 hours at 50 DEG C；Gained gel has preferable globality, higher intensity and elastic deformation characteristic, right
Crack (especially unstable crack) profile control effect is preferable；Meet the needs of low temperature, crack well profile control.
The present invention also provides a kind of applications for low temperature, fracture formation underground synthesized gel rubber profile control agent, by profile control agent
Squeezing includes the following steps with progress profile control processing, specific profile control agent is reacted behind stratum with liquid and squeezing construction：
I) it according to ratio requirement, carries out matching liquid using special liquid equipment, the special liquid equipment includes first with liquid
Tank and the second Agitation Tank, the first Agitation Tank and the second Agitation Tank respectively by respective oil pipe successively with respective centrifugal water pump,
Flowmeter links and is connected with pond is mixed；
Ii) be put into clear water in stirring pool, start blender, be slowly added into monomer, acrylic acid, then use cementing truck or from
Solution in stirring pool is pumped into monomer tank by heart pump, is continued to supply clear water to 1/2 and cycle balance of profile control agent liquid measure, is obtained list
Liquid solution；
Iii it) is put into clear water in stirring pool, starts blender, be slowly added into N.N- methylene-bisacrylamides and over cure
Then solution in stirring pool is pumped into monomer tank by acid amide with cementing truck or centrifugal pump, continue to supply clear water to profile control agent liquid
1/2 and cycle balance of amount, obtain crosslinker solution；
Iv clear water) is added in third Agitation Tank, polyacrylamide pulvis is then added, is uniformly mixed to obtain protection liquid；
V) profile control is constructed：Profile control construction is carried out by the slug sequence of protection liquid-profile control agent-protection liquid-clear water；Squeeze first
Start to prepare after protection liquid slug and squeeze into profile control agent to stratum simultaneously, profile control agent compounding method is by monomer solution and to be crosslinked molten
Liquid is pumped into mixing and stirring tank with same traffic and is uniformly mixed, and is then squeezed into ground by the profile control agent in agitator tank with cementing truck
Layer, then squeezes into protection liquid and clear water successively, and profile control construction is completed in closing well reaction.
Vi) in said program, circulating pump is respectively set in first Agitation Tank and the second Agitation Tank, introduces monomer solution
1.5h or more is recycled respectively with crosslinker solution.
In said program, in the protection liquid, mass percent shared by polyacrylamide powder is 0.4~0.6%.
Compared with prior art, beneficial effects of the present invention are：
1) profile control agent and profile control technology of the present invention optimize liquid equipment and side by preferably suitable formula, proportioning
Method, site construction technology, ensureing profile control effect and under the premise of water-injection efficiency, be successfully difficult to the polymerisation of control from
Ground Application to underground, the raw material for overcoming the influence of the factors such as water environment, high valence ion, acid-base value, oxidant, and being related at
This is low, easy to operate reliable, has important engineering application value.
2) profile control agent of the present invention is underground synthesized gel rubber profile control agent, and polymerization reaction time is more than 7 days at 20 DEG C,
The reaction time is more than 4 hours at 50 DEG C, disclosure satisfy that safe construction needs；The gel of formation has preferable globality, has excellent
Different intensity and elastic deformation characteristic, fracture have good profile control effect, meet the profile control needs of low temperature, crack well.
3) present invention gained profile control agent has injection viscosity is low, gel strength is high, elastic deformability is good after reaction (to remove outer
After force effect, fast quick-recovery formability can be good) the advantages that, it is especially good to unstable crack plugging effect；And the cost that is related to it is low,
Quick construction is suitble to promote and apply.
4) it carries out matching liquid using special liquid equipment, can effectively inhibit the rapid polymerization caused by local concentration is excessively high existing
As, while making effectively to combine with liquid and squeezing, it improves with liquid quality and reduces construction risk, ensure the same of profile control processing validity
Shi Tigao profile control treatment effeciencies.
Description of the drawings
Fig. 1 is the special liquid equipment structural schematic diagram that one embodiment of the invention uses.
Fig. 2 is surface line connection diagram described in application examples of the present invention.
Specific implementation mode
To be best understood from the present invention, the present invention is further described with reference to embodiments, but the present invention is not only
It is confined to the following examples.
Embodiment 1
For low temperature, fracture formation underground synthesized gel rubber profile control agent, each component and its shared mass percent are one kind：Third
Acrylamide monomer 10%, acrylic acid 2%, N.N- methylene-bisacrylamides 0.02%, Ammonium Persulfate 98.5 0.08%, surplus are water,
With 20 side of profile control agent；Preparation method includes the following steps：
1) it is slowly added 2000Kg acrylamide monomers and 400Kg acrylic acid successively into 8.0 side's clear water, then supplies clear
Water is uniformly mixed to 10 sides, obtains monomer solution；
2) 4Kg N.N- methylene-bisacrylamides and 16Kg Ammonium Persulfate 98.5s will be added successively in 8.0 side's clear water, then mend
Sufficient clear water is stirred uniformly mixed to 10 sides, obtains crosslinker solution；
3) gained monomer solution and crosslinker solution are uniformly mixed, obtain low temperature, fracture formation underground synthesized gel rubber profile control agent.
The viscosity of gel profile control agent obtained by the present embodiment is 1.0mP.S；In temperature it is 50 DEG C, under normal pressure pressure condition by it
After reaction 3 days, gained gel such as transparent rubber shape, intensity is too high to be characterized with viscosity, measured by crack rock core test prominent
Broken barometric gradient is 32MPa/m, while rapid polymerization phenomenon caused by effective inhibition is excessively high because of local concentration, it is ensured that envelope
Stifled effect, and significantly reduce manufacturing cost；And gained gel elastomer morphotropism is good, and formability is recovered immediately after removing external force action
It can be good.
Embodiment 2
For low temperature, fracture formation underground synthesized gel rubber profile control agent, each component and its shared mass percent are one kind：Third
Acrylamide monomer 6%, acrylic acid 1%, N.N- methylene-bisacrylamides 0.02%, Ammonium Persulfate 98.5 0.1%, surplus are water, are matched
20 side of profile control agent；Preparation method includes the following steps：
1) it is slowly added 1200Kg acrylamide monomers and 200Kg acrylic acid successively into 8 side's clear water, then supplies clear water
It to 10 sides, is uniformly mixed, obtains monomer solution；
2) 4Kg N.N- methylene-bisacrylamides and 20Kg Ammonium Persulfate 98.5s are added successively into 8 side's clear water, then supply
Clear water is stirred uniformly mixed to 10 sides, obtains crosslinker solution；
3) gained monomer solution and crosslinker solution are uniformly mixed, obtain low temperature, fracture formation underground synthesized gel rubber profile control agent.
The viscosity of gel profile control agent obtained by the present embodiment is 1.0mP.S；In temperature it is 50 DEG C, under normal pressure pressure condition by it
After reaction 3 days, gained gel such as transparent rubber shape, intensity is too high to be characterized with viscosity, measured by crack rock core test prominent
Broken barometric gradient is 24MPa/m, while rapid polymerization phenomenon caused by effective inhibition is excessively high because of local concentration, it is ensured that envelope
Stifled effect, and significantly reduce manufacturing cost；And gained gel elastomer morphotropism is good, and formability is recovered immediately after removing external force action
It can be good.
Embodiment 3
For low temperature, fracture formation underground synthesized gel rubber profile control agent, each component and its shared mass percent are one kind：Third
Acrylamide monomer 6%, acrylic acid 1%, N.N- methylene-bisacrylamides 0.02%, Ammonium Persulfate 98.5 0.1%, 2- acrylamides-
2- methyl propane sulfonic acids 0.02%, surplus are water, match 20 side of profile control agent；Preparation method includes the following steps：
1) 1200Kg acrylamide monomers, 200Kg acrylic acid and 4Kg 2- acryloyls are slowly added successively into 8 side's clear water
Then amine -2- methyl propane sulfonic acids supply clear water to 10 sides, are uniformly mixed, obtain monomer solution；
2) 4Kg N.N- methylene-bisacrylamides and 20Kg Ammonium Persulfate 98.5s are added successively into 8 side's clear water, then supply
Clear water is stirred uniformly mixed to 10 sides, obtains crosslinker solution；
3) gained monomer solution and crosslinker solution are uniformly mixed, obtain low temperature, fracture formation underground synthesized gel rubber profile control agent.
The viscosity of gel profile control agent obtained by the present embodiment is 1.0mP.s；In temperature it is 50 DEG C, under normal pressure pressure condition by it
After reaction 3 days, gained gel such as transparent rubber shape, intensity is too high to be characterized with viscosity, measured by crack rock core test prominent
Broken barometric gradient is 28MPa/m, and excellent gel strength can be realized under conditions of low monomer concentration, is inhibited because of office effective
Caused by portion's excessive concentration while rapid polymerization phenomenon, it is ensured that plugging effect, and significantly reduce manufacturing cost；And gained is solidifying
Glue elasticity morphotropism is good, removes that recover immediately shape performance after external force action good.
Application examples 1
Synthesized gel rubber profile control agent in underground of the present invention is applied to waterflooding oil field, blocks water breakthrough channel；Wherein use
Amount is designed as：Protection liquid is 20 side of individual well, 40 side of profile control agent；Detail design parameter is：Operational discharge capacity 200-400L/min, construction
Pressure≤14MPa；Specifically comprise the following steps：
I) it according to recipe requirements, carries out matching liquid using special liquid equipment (structural schematic diagram is shown in Fig. 1)；Wherein profile control agent is matched
Each component and its shared mass percent are in side：Acrylamide monomer 10%, acrylic acid 2%, N.N- methylene bisacrylamide acyls
Amine 0.02%, Ammonium Persulfate 98.5 0.06%, surplus are water；The special liquid equipment includes the first Agitation Tank and the second Agitation Tank,
First Agitation Tank and the second Agitation Tank linked successively with respective centrifugal water pump, flowmeter by respective oil pipe respectively and with it is mixed
Stirring pool is closed to be connected；
Ii it) is slowly added to acrylamide monomer, acrylic acid into the water for accounting for general name water withdrawal 1/2, is uniformly mixed, so
After be pumped into the first Agitation Tank, start the cycle pump circulation 1.5h or more that is arranged in the first Agitation Tank, it is spare to obtain monomer solution；
Iii N.N- methylene-bisacrylamides and Ammonium Persulfate 98.5) are added into remaining water, is uniformly mixed, then pumps
Enter in the second Agitation Tank, starts the cycle pump circulation 1.5h or more being arranged in the second Agitation Tank, it is spare to obtain crosslinker solution；
Iv clear water) is added in third Agitation Tank, polyacrylamide (molecular weight is 4,000,000~6,000,000) powder is then added
Agent is uniformly mixed to obtain protection liquid, and it is 0.4~0.6% to protect mass percent shared by polyacrylamide powder in liquid；
V) surface line is connected by positive squish flow journey, tries to squeeze 5 sides, 100~300L/min of discharge capacity, geodetic after clear water pressure testing qualification
The absorbability of layer, while measuring shut-in pressure decline curve；
Vi) monomer solution and crosslinker solution are pumped into same traffic in mixing and stirring tank and are uniformly mixed, underground synthesis is obtained
Gel profile control agent is spare；
Vii stifled construction) is squeezed, it is as follows to squeeze into sequence：15m3Protect liquid --- 20~40m3Underground synthesized gel rubber profile control agent ---
5m3Protect liquid --- clear water (flow line volume+1~2) m3；
Viii) closing well reacts 5 days, observes and records well head pressure drop situation；The primary pressure of every 10 minutes records in closing well 1 hour
Power, every 1 hour record is primary in 1~4 hour, and record in subsequent 4 hours or more is primary (test result is shown in Table 1)；
Ix) after reaction, former tubing string restores water filling by injection allocation scheme.
Average water injection pressure rises 2MPa after field test；It is close to expand after the compressive deformation under pressure of gained gel
Crack wall surface, avoid high intensity rigidity blocking agent (morphotropism is poor) and continue water caused by crack continues to expand after pressure rising
Phenomenon is altered, it is good to unstable crack plugging effect.
Closing well pressure drop data record sheet after the processing of 1 profile control of table
| Closed-in time | Pressure after closing well, MPa |
| 0 | 11.5 |
| 10min | 10.0 |
| 20min | 9.0 |
| 30min | 8.8 |
| 40min | 8.6 |
| 50min | 8.4 |
| 60min | 8.3 |
| 1.5h | 8.2 |
| 2.0h | 8.1 |
| 3.0h | 8.0 |
| 4.0h | 7.9 |
| 8.0h | 7.8 |
| 14.0h | 7.8 |
| 36.0h | 7.8 |
| 48.0h | 7.8 |
| 96.0h | 7.8 |
| 120.0h | 7.8 |
Application examples 2
The profile control agent prescription that application examples 2 uses is roughly the same with application examples 1, the difference is that initiator ammonium persulfate institute
It is 0.08% to account for mass percent, is suitable for constructing under 20 DEG C or so temperature using 2 identical profile control technology of application examples, application examples
1 formula is suitable for constructing under 25 DEG C or more temperature；There is gained gel preferable globality, higher intensity and elasticity to become
Shape characteristic, fracture profile control effect are preferable.
Application examples 3
The profile control agent prescription that application examples 3 uses is roughly the same with application examples 1, the difference is that shared by acrylamide monomer
Mass percent is 6%, and using 1 identical profile control technology of application examples, main processing water breakthrough is not too serious well profile modification；Such as
Fruit system allows water injection pressure for 10.0MPa, and water injection pressure has reached 8.0MPa or more before profile control well profile control.In the water filling item
Under part, if formula in acrylamide additive amount select 11%, profile control processing after be likely to because block excessively due to cause note not into
Profile control effect is not achieved in water.
Obviously, above-described embodiment be only intended to clearly illustrate made by example, and not limitation to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation or change therefore amplified
It moves within still in the protection domain of the invention.
Claims (7)
1. one kind is for low temperature, fracture formation underground synthesized gel rubber profile control agent, each component and its shared mass percent include：Third
Acrylamide monomer 6~10%, acrylic acid 1.0~2%, N.N- methylene-bisacrylamides 0.02~0.03%, Ammonium Persulfate 98.5
0.06~0.1%, surplus is water.
2. according to claim 1 for low temperature, fracture formation underground synthesized gel rubber profile control agent, which is characterized in that each group
Divide and its shared mass percent includes：Acrylamide monomer 6~7%, acrylic acid 1.0%, N.N- methylene-bisacrylamides
0.02%, Ammonium Persulfate 98.5 0.06~0.1%, surplus is water.
3. according to claim 1 for low temperature, fracture formation underground synthesized gel rubber profile control agent, which is characterized in that each group
Divide and its shared mass percent includes：Acrylamide monomer 9~10%, acrylic acid 2.0%, N.N- methylene-bisacrylamides
0.02%, Ammonium Persulfate 98.5 0.06~0.1%, surplus is water.
4. the preparation method described in any one of claims 1 to 3 for low temperature, fracture formation underground synthesized gel rubber profile control agent,
It is characterized in that, includes the following steps：
1) each component is weighed according to recipe requirements, acrylamide monomer and propylene is added into the water for weighing water 1/2~2/3
Acid is uniformly mixed, and obtains monomer solution；
2) it is weighed to residue and N.N- methylene-bisacrylamides and Ammonium Persulfate 98.5 is added in water, be uniformly mixed, must be crosslinked molten
Liquid；
3) add jet pump to suck polyacrylamide pulvis in Agitation Tank with cementing truck, add water and cycle balance, obtain protection liquid；
4) monomer solution and crosslinker solution are uniformly mixed, obtain the underground synthesized gel rubber profile control agent, it, will after liquid is protected in injection
Gained underground synthesized gel rubber profile control agent injects progress profile control processing at formation fracture to be blocked.
5. being used for the application of low temperature, fracture formation underground synthesized gel rubber profile control agent, feature described in any one of claims 1 to 3
It is, being applied to profile control and handling, specific profile control agent includes the following steps with liquid and squeezing construction：
I) according to ratio requirement, liquid match using special liquid equipment, the special liquid equipment include the first Agitation Tank and
Second Agitation Tank, the first Agitation Tank and the second Agitation Tank respectively by respective woven hose successively with respective centrifugal water pump, stream
Gauge links and is connected with pond is mixed；
Ii) be put into clear water in stirring pool, start blender, acrylamide monomer, acrylic acid is added, then use cementing truck or from
Solution in stirring pool is pumped into monomer tank by heart pump, is continued to supply clear water to 1/2 and cycle balance of profile control agent liquid measure, is obtained list
Liquid solution；
Iii it) is put into clear water in stirring pool, starts blender, N.N- methylene-bisacrylamides and Ammonium Persulfate 98.5 is added, then
The solution in stirring pool is pumped into monomer tank with cementing truck or centrifugal pump, continue to supply clear water to profile control agent liquid measure 1/2 simultaneously
Cycle balance obtains crosslinker solution；
Iv clear water) is added in third Agitation Tank, polyacrylamide pulvis is then added, is uniformly mixed to obtain protection liquid；
V) profile control is constructed：Profile control construction is carried out by the slug sequence of protection liquid-profile control agent-protection liquid-clear water；The first protection is squeezed
After liquid slug, starts to prepare and squeeze into profile control agent to stratum simultaneously, profile control agent compounding method is by monomer solution and crosslinker solution
It is pumped into mixing and stirring tank and is uniformly mixed with same traffic, then gained profile control agent in agitator tank is squeezed into ground with cementing truck
Layer, then protection liquid and clear water are squeezed into successively, profile control construction is completed in closing well reaction.
6. application according to claim 5, which is characterized in that be respectively set in first Agitation Tank and the second Agitation Tank
Circulating pump recycles 1.5h or more respectively after introducing monomer solution and crosslinker solution.
7. application according to claim 5, which is characterized in that in the protection liquid, quality shared by polyacrylamide powder
Percentage is 0.4~0.6%.
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| CN112878996A (en) * | 2021-01-29 | 2021-06-01 | 中国石油天然气集团有限公司 | Method for judging and identifying fracture channeling of fractured horizontal well |
| CN114437686A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | High-temperature-resistant high-salt-resistant chemical bridge plug composition for well bore, gel thereof, preparation method and application |
| CN116426258A (en) * | 2022-09-27 | 2023-07-14 | 中海石油（中国）有限公司天津分公司 | Crack type submarine mountain oil reservoir multi-section plug combined profile control agent and construction method thereof |
| CN117209657A (en) * | 2023-09-13 | 2023-12-12 | 西南石油大学 | Polymer gel plugging agent suitable for tight fractured reservoir and preparation method thereof |
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Effective date of registration: 20191205 Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant after: China Petrochemical Co., Ltd. Applicant after: PETROLEUM ENGINEERING TECHNOLOGY RESEARCH INSTITUTE, JIANGHAN OILFIELD BRANCH OF CHINA PETROCHEMICAL CORPORATION Address before: 430035 Hubei city of Wuhan province Gutian two Road No. 37 HSBC Nanniwan Avenue headquarters block fifth B Applicant before: PETROLEUM ENGINEERING TECHNOLOGY RESEARCH INSTITUTE, JIANGHAN OILFIELD BRANCH OF CHINA PETROCHEMICAL CORPORATION |
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Application publication date: 20180824 |