CN113107413A - Split type all-metal sealing device - Google Patents
Split type all-metal sealing device Download PDFInfo
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- CN113107413A CN113107413A CN202010020658.4A CN202010020658A CN113107413A CN 113107413 A CN113107413 A CN 113107413A CN 202010020658 A CN202010020658 A CN 202010020658A CN 113107413 A CN113107413 A CN 113107413A
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- 238000007789 sealing Methods 0.000 title claims abstract description 210
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 8
- 210000000078 claw Anatomy 0.000 claims description 14
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
-
- 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
- E21B33/134—Bridging plugs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Sealing Devices (AREA)
Abstract
The invention discloses a split type all-metal sealing device which comprises a central tube (16), wherein a setting mechanism and a slip mechanism which are arranged up and down are sleeved outside the central tube (16), the setting mechanism comprises an inner guide tube (1), a push tube (2), an upper sealing assembly (3) and a lower sealing assembly (5), in the process that the push tube (2) pushes the upper sealing assembly (3) to move along the axial direction, the upper sealing assembly (3) and the lower sealing assembly (5) are overlapped gradually along the axial direction, the upper sealing assembly (3) and the lower sealing assembly (5) are gradually far away from the axis of the central tube (16) along the radial direction, and the upper sealing assembly (3) and the lower sealing assembly (5) can be combined into a cylinder which is complete in the circumferential direction. The split type all-metal sealing device has a split type sealing assembly structure, and the use of rubber materials can be greatly reduced.
Description
Technical Field
The invention relates to the field of oil exploitation equipment, in particular to a split type all-metal sealing device.
Background
With the increase of the demand of unconventional oil and gas exploitation, the horizontal well staged fracturing technology has wider and wider application prospects in the aspects of reservoir transformation and single well yield improvement. At present, drillable bridge plugs (including large-drift-diameter bridge plugs, fast-drilling bridge plugs and the like) are mostly adopted in the staged fracturing technology of horizontal wells. The drillable bridge plug is in that the drilling tool must be gone down to grind and mill the operation after fracturing construction, easily causes the accident in the pit, and the operation construction cost is high, and piece and operation mud easily pollute the reservoir simultaneously. Therefore, the development of the soluble bridge plug which can reduce the cost and simplify the fracturing process is of great significance.
The soluble bridge plug can be dissolved automatically after fracturing construction is completed, salvage and drilling and grinding are avoided, and a full-bore shaft is left for production and later measures without any intervention. Compared with a drillable bridge plug, the soluble bridge plug can reduce operation risk and cost and provide powerful technical support for increasing production in the later period of the oil field.
At present, the soluble bridge plug at home and abroad adopts a rubber material to manufacture a rubber cylinder to ensure the plugging effect, but the problem that the rubber material cannot be dissolved or the dissolution rate is low and cannot ensure the same dissolution rate as that of soluble metal is generally existed, the rubber cylinder cannot be dissolved, so that a full-bore shaft cannot be left for operation, the well dredging operation is required, the overall dissolution time of the bridge plug is longer due to the slow dissolution rate of the rubber cylinder, and the production period is increased after fracturing construction.
Disclosure of Invention
In order to greatly reduce the use of rubber materials in a soluble bridge plug, the invention provides a split type all-metal sealing device, which can greatly reduce the use of rubber materials in the bridge plug, and can ensure the solubility, reduce the length of a sealing structure and reduce the dissolving time if the split type all-metal sealing device is used as the soluble bridge plug. If the split type all-metal sealing device is used as a quick drilling bridge plug, the drilling and grinding time can be reduced due to the short sealing structure.
The technical scheme adopted by the invention for solving the technical problems is as follows: a split type all-metal sealing device comprises a central tube, a setting mechanism and a slip mechanism which are vertically arranged are sleeved outside the central tube, the setting mechanism comprises an inner guide cylinder, a push cylinder, an upper sealing assembly and a lower sealing assembly, wherein the central pipe, the inner guide cylinder and the push cylinder are sequentially sleeved from inside to outside, the upper sealing assembly and the lower sealing assembly are arranged up and down, the upper sealing assembly comprises a plurality of upper sealing blocks arranged at intervals along the circumferential direction, the lower sealing assembly comprises a plurality of lower sealing blocks arranged at intervals along the circumferential direction, a gap is formed between every two adjacent lower sealing blocks, the upper sealing blocks correspond to the gaps one by one, in the process that the push cylinder pushes the upper sealing assembly to move downwards along the axial direction, the upper sealing assembly and the lower sealing assembly are overlapped gradually along the axial direction, the upper sealing assembly and the lower sealing assembly are gradually far away from the axis of the central tube along the radial direction, and the upper sealing assembly and the lower sealing assembly can be combined into a cylinder with complete circumferential direction.
The central tube is in an upright state, the central tube is fixedly connected with the inner guide cylinder, the push cylinder comprises a cylinder section, a circular ring section and a conical section which are sequentially arranged from top to bottom, and the upper sealing assembly and the lower sealing assembly are both positioned outside the conical section.
The conical surface section contains a plurality of split claws arranged at intervals along the circumferential direction, the number of the split claws is equal to the sum of the number of the upper sealing blocks and the number of the lower sealing blocks, and axial guide grooves and axial insertion grooves which are alternately arranged are formed at intervals between every two adjacent split claws along the circumferential direction of the push cylinder.
The lower part of the inner guide cylinder is provided with outer convex edges which are correspondingly spliced with the axial splicing grooves one by one, and outer sliding grooves are arranged in the outer surfaces of the outer convex edges.
The distance from the upper end of the outer sliding groove to the axis of the central pipe is smaller than the distance from the lower end of the outer sliding groove to the axis of the central pipe, an inner sliding block is arranged on the inner surface of the upper sealing block, the inner sliding block is connected with the outer sliding groove in a matched and inserting mode, and the upper sealing block can slide along the outer sliding groove by means of the inner sliding block.
The both sides of outer spout all are equipped with the outer slide, and the outer slide is parallel with the outer spout, and interior slider passes through first round pin axle and is connected with the outer slide, and the axis of first round pin axle is perpendicular with the axis of center tube.
The center tube overcoat is equipped with the base, the base is located sealing component's below down, the base is telescopic structure, the base contains inboard barrel and outside barrel, inboard barrel and outside barrel pass through first connecting plate and connect, form the passageway that the axial link up between inboard barrel and the outside barrel, the upper portion of first connecting plate can be pegged graft in the axial guiding groove, the up end of first connecting plate is the inclined plane, the inner on this inclined plane is higher than the outer end on this inclined plane, be equipped with the through-hole spout in the upper end of first connecting plate, the through-hole spout is rectangular shape, the through-hole spout is parallel with this inclined plane, lower seal block passes through second round pin axle and is connected with the through-hole spout, the axis of second round pin axle is perpendicular with the axis of center tube, lower.
The side surface of the upper sealing block is of a trapezoidal structure with the top end facing downwards and the bottom end facing upwards after being unfolded, the side surface of the lower sealing block is of a trapezoidal structure with the top end facing upwards and the bottom end facing downwards after being unfolded, and when the upper sealing assembly and the lower sealing assembly are combined into a cylinder with complete circumferential direction, the contact surfaces of the upper sealing block and the lower sealing block are matched; the outer surface of the upper sealing block is embedded with an arc-shaped upper sealing rubber strip, the outer surface of the lower sealing block is embedded with an arc-shaped lower sealing rubber strip, and when the upper sealing assembly and the lower sealing assembly are combined into a cylinder with complete circumference, the upper sealing rubber strip and the lower sealing rubber strip can be combined into a circular ring with complete circumference.
The slip mechanism comprises a base, an upper cone, a lower cone and a lower push ring which are sequentially arranged from top to bottom, wherein a plurality of upper slip seats are arranged between the base and the upper cone, a plurality of lower slip seats are arranged between the lower cone and the lower push ring, the upper slip seats and the lower slip seats can both be gradually away from the axis of a central tube along the radial direction, and the inner guide cylinder, the push cylinder, the upper sealing assembly, the lower sealing assembly, the base, the upper cone, the lower push ring and the central tube are made of soluble alloy.
The base, go up the cone and the cone homoenergetic is removed along the axis direction of center tube down, and push ring is connected fixedly with the center tube down, and the lower part of center tube is equipped with the annular groove, and the axial position of annular groove is corresponding with the axial position of lower slip seat, and when the upper end of center tube received ascending pulling force, the center tube can be at annular groove department fracture.
The invention has the beneficial effects that: the split type all-metal sealing device has a split type sealing assembly structure, so that the use of rubber materials can be greatly reduced, and the solubility is ensured; the invention also has a releasing structure, which can reduce the length of the sealing structure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a top view of the split all-metal seal of the present invention.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Fig. 3 is a sectional view taken along the direction B-B in fig. 1.
Fig. 4 is a perspective view of the pusher.
Fig. 5 is a cross-sectional view of the pusher.
Fig. 6 is a front view of the pusher.
Fig. 7 is a schematic view of an inner guide barrel.
Fig. 8 is a schematic view of an upper seal block.
Fig. 9 is a schematic view of the lower seal block.
Fig. 10 is a schematic view of the base in a cross-sectional view taken along the direction C-C in fig. 2.
FIG. 11 is a side expanded schematic view of the upper and lower seal assemblies.
Fig. 12 is an enlarged schematic view of the base portion of fig. 2.
1. An inner guide cylinder; 2. a push cylinder; 3. an upper seal assembly; 4. an upper sealing rubber strip; 5. a lower seal assembly; 6. a lower sealing rubber strip; 7. a base; 8. an upper hoop; 9. an upper slip seat; 10. ceramic particles; 11. a lower hoop; 12. an upper cone; 13. a lower cone; 14. a lower slip seat; 15. a push ring is pushed down; 16. a central tube;
101. an outer rib; 102. an outer chute; 103. an outer slide way;
201. a cylinder section; 202. a circular ring section; 203. a conical surface section; 204. a split claw; 205. an axial guide groove; 206. an axial insertion groove;
301. an upper sealing block; 302. an inner slide block; 303. a first pin shaft;
501. a lower seal block; 502. a second pin shaft;
701. an inner cylinder; 702. an outer cylinder; 703. a first connecting plate; 704. a second connecting plate; 705. a through-hole chute;
1601. an annular groove.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A split type all-metal sealing device comprises a central tube 16, a setting mechanism and a slip mechanism which are arranged up and down are sleeved outside the central tube 16, the setting mechanism comprises an inner guide tube 1, a push tube 2, an upper sealing assembly 3 and a lower sealing assembly 5, the central tube 16, the inner guide tube 1 and the push tube 2 are sequentially sleeved from inside to outside, the upper sealing assembly 3 and the lower sealing assembly 5 are arranged up and down, the upper sealing assembly 3 comprises a plurality of upper sealing blocks 301 which are uniformly arranged along the circumferential direction at intervals, the lower sealing assembly 5 comprises a plurality of lower sealing blocks 501 which are uniformly arranged along the circumferential direction at intervals, a gap is formed between every two adjacent lower sealing blocks 501, the upper sealing blocks 301 correspond to the gap one by one, in the process that the push tube 2 pushes the upper sealing assembly 3 to move downwards along the axial direction, the upper sealing blocks 301 gradually enter the gap, so that the upper sealing assembly 3 and the lower sealing assembly 5 are gradually overlapped along the axial direction, both the upper seal assembly 3 and the lower seal assembly 5 are radially spaced from the axis of the central tube 16, and eventually the upper seal assembly 3 and the lower seal assembly 5 can be combined into a circumferentially complete cylinder, as shown in fig. 1-12.
In the present embodiment, the center tube 16 is in an upright state, and the axis of the center tube 16, the axis of the inner guide sleeve 1, and the axis of the push sleeve 2 coincide. The central tube 16 is fixed with the inner guide cylinder 1 through threaded connection, the push cylinder 2 comprises a cylinder section 201, a ring section 202 and a conical section 203 which are sequentially arranged from top to bottom, and the upper sealing assembly 3 and the lower sealing assembly 5 are both positioned outside the conical section 203. The ring segment 202 is used to push the upper seal assembly 3 and the lower seal assembly 5 downward along the axial direction of the central tube 16, and the tapered surface segment 203 is generally in a tapered structure with the top end facing downward and the bottom end facing upward, as shown in fig. 4 to 6.
In the present embodiment, the tapered surface section 203 includes a plurality of split claws 204 arranged at intervals in the circumferential direction, the number of the split claws 204 is equal to the sum of the number of the upper seal blocks 301 and the number of the lower seal blocks 501, for example, the upper seal assembly 3 includes 2 upper seal blocks 301, the lower seal assembly 5 includes 2 lower seal blocks 501, and the tapered surface section 203 includes 4 split claws 204. In the circumferential direction of the push tube 2, the interval between two adjacent split claws 204 forms axial guide grooves 205 and axial insertion grooves 206 which are alternately arranged.
In this embodiment, the lower portion of the inner guide cylinder 1 is provided with the outer protruding ribs 101, the outer protruding ribs 101 are arranged along the axial direction of the central tube 16, the outer protruding ribs 101 are correspondingly inserted into the axial insertion grooves 206 one by one, that is, the outer protruding ribs 101 are inserted into the axial insertion grooves 206 in a matching manner, the lower portion of the inner guide cylinder 1 is provided with two outer protruding ribs 101, the two outer protruding ribs 101 are symmetrically arranged in front and back, and the outer sliding grooves 102 are arranged in the outer surfaces of the outer protruding ribs 101, as shown in fig. 7.
In this embodiment, the distance from the upper end of the outer sliding groove 102 to the axis of the central tube 16 is smaller than the distance from the lower end of the outer sliding groove 102 to the axis of the central tube 16, an inner sliding block 302 is arranged on the inner surface of the upper sealing block 301, the inner sliding block 302 is inserted into the outer sliding groove 102 in a matching manner, the upper sealing block 301 can slide along the outer sliding groove 102 by means of the inner sliding block 302, and the inner surfaces of the upper sealing blocks 301 on both sides of the inner sliding block 302 are matched with the outer surfaces of the split claws 204 on both sides of the axial insertion.
In order to prevent the upper sealing block 301 from being separated from the inner guide cylinder 1, the outer slide ways 103 are arranged on two sides of the outer slide way 102, the outer slide ways 103 are parallel to the outer slide way 102, the inner slide block 302 is connected with the outer slide ways 103 through a first pin shaft 303, and the axis of the first pin shaft 303 is perpendicular to the axis of the central tube 16. A first pin shaft 303 penetrates through the inner slide block 302, and both ends of the first pin shaft 303 are located in the outer slide way 103.
In this embodiment, a base 7 is sleeved outside the central tube 16, the base 7 is located below the lower sealing assembly 5, the base 7 is of a sleeve-type structure, the base 7 includes an inner cylinder 701 and an outer cylinder 702, the inner cylinder 701 and the outer cylinder 702 are connected through a first connecting plate 703, an axially through channel is formed between the inner cylinder 701 and the outer cylinder 702, the first connecting plate 703 can be fittingly inserted into the axially guiding groove 205, an upper end surface of the first connecting plate 703 is an inclined surface, an inner end of the inclined surface is higher than an outer end of the inclined surface, a through-hole sliding groove 705 is formed in an upper end of the first connecting plate 703, the through-hole sliding groove 705 is in a long strip shape, the through-hole sliding groove 705 is parallel to the inclined surface, the lower sealing block 501 is connected with the through a second pin shaft 502, the second pin shaft 502 passes through the through-hole sliding groove 705, both ends of the second pin 502 are located at the lower sealing block 501, a, the second pin 502 can prevent the lower sealing block 501 from separating from the base 7, the axis of the second pin 502 is perpendicular to the axis of the central tube 16, and the lower sealing block 501 can slide along the through-hole sliding groove 705. The inner surface of the lower sealing block 501 matches the outer surface of the split claw 204 on both sides of the axial guide groove 205.
In this embodiment, the side of the upper sealing block 301 is unfolded to form an isosceles trapezoid structure with a downward top end and a downward bottom end, the side of the lower sealing block 501 is unfolded to form an isosceles trapezoid structure with a downward top end and a downward bottom end, and when the upper sealing assembly 3 and the lower sealing assembly 5 are combined into a cylinder with a complete circumferential direction, the contact surfaces of the upper sealing block 301 and the lower sealing block 501 are matched, namely, the inclined surfaces of the two sides of the upper sealing block 301 are completely matched with the inclined surfaces of the two sides of the lower sealing block 501. The meaning of a cylinder with complete circumferential direction is that no notch penetrating along the axial direction is arranged on the cylinder wall of the cylinder, and the cylinder wall of the cylinder is continuous within the range of 360 degrees in the circumferential direction.
In this embodiment, the embedded arc-shaped upper joint strip 4 that is equipped with in outside surface of upper seal block 301, the embedded arc-shaped lower joint strip 6 that is equipped with in outside surface of lower seal block 501, upper joint strip 4 is the same with the quantity of lower joint strip 6, when upper seal assembly 3 and lower seal assembly 5 make up into the complete drum of a circumference, upper joint strip 4 corresponds with lower joint strip 6 and is connected, upper joint strip 4 can make up into the complete ring of circumference with lower joint strip 6, thereby realize sitting and seal.
Specifically, 2 upper sealing rubber strips 4 are embedded in the outer side surface of the upper sealing block 301, 2 lower sealing rubber strips 6 are embedded in the outer side surface of the lower sealing block 501, and when the upper sealing assembly 3 and the lower sealing assembly 5 are combined into a cylinder with complete circumferential direction, 2 sealing rings or sealing circles with complete circumferential direction are formed on the cylinder. The meaning of the circumferentially complete ring is that the ring has no axially through-going gap, and the ring is continuous in the circumferential direction over 360 degrees, as shown in fig. 1.
In this embodiment, the slip mechanism includes a base 7, an upper cone 12, a lower cone 13 and a lower push ring 15, which are sequentially arranged from top to bottom, wherein a plurality of upper slip seats 9 are arranged between the base 7 and the upper cone 12, a plurality of lower slip seats 14 are arranged between the lower cone 13 and the lower push ring 15, and both the upper slip seats 9 and the lower slip seats 14 can gradually move away from the axis of the central tube 16 along the radial direction.
The base 7, the upper cone 12, the lower cone 13 and the lower push ring 15 are all cylindrical structures, the axis of the central tube 16, the axis of the base 7, the axis of the upper cone 12, the axis of the lower cone 13 and the axis of the lower push ring 15 are overlapped, and the lower push ring 15 is in threaded connection with the lower end of the central tube 16. The plurality of upper slip seats 9 are evenly spaced along the circumference of the base 7, and the plurality of lower slip seats 14 are evenly spaced along the circumference of the base 7. A plurality of last slip bowl 9 are through last hoop 8 and 11 fixed positions of hoop down, and a plurality of slip bowl 14 down are through last hoop 8 and 11 fixed positions of hoop down, and the surface of going up slip bowl 9 and slip bowl 14 down all is equipped with ceramic particle 10.
The base 7 is of a sleeve type structure, the base 7 comprises an inner cylinder 701 and an outer cylinder 702, and the split claw 204 of the push cylinder 2 enters the axially through channel in the process that the push cylinder 2 pushes the upper sealing assembly 3 to move axially. A second connecting plate 704 is further provided between the inner cylinder 701 and the outer cylinder 702, and the upper end of the second connecting plate 704 abuts against the lower end of the outer convex ridge 101 of the inner guide cylinder 1. The position of the lower sealing block 501 corresponds to the position of the first connecting plate 703, the inner cylinder 701 and the outer cylinder 702 are connected by the two first connecting plates 703 and the two second connecting plates 704, the two first connecting plates 703 are arranged in bilateral symmetry, and the two second connecting plates 704 are arranged in vertical symmetry, as shown in fig. 10, the position of the lower sealing block 501 corresponds to the position of the first connecting plate 703 one by one, and the position of the upper sealing block 301 corresponds to the position of the second connecting plate 704 one by one.
In the process that the push cylinder 2 pushes the upper sealing assembly 3 to move axially downwards, the push cylinder 2 also pushes the lower sealing assembly 5 to move axially downwards, meanwhile, the upper sealing assembly 3 and the lower sealing assembly 5 are gradually away from the axis of the central tube 16 along the radial direction, and finally, the upper sealing assembly 3 and the lower sealing assembly 5 can be combined into a complete cylinder in the circumferential direction.
In the present embodiment, the base 7, the upper cone 12 and the lower cone 13 are all capable of moving along the axial direction of the central tube 16, the lower push ring 15 is screwed with the central tube 16, the lower part of the central tube 16 is provided with an annular groove 1601, the axial position of the annular groove 1601 corresponds to the axial position of the lower slip seat 14, and when the upper end of the central tube 16 is pulled upwards, the central tube 16 can be broken at the annular groove 1601.
The push cylinder 2 can make the base 7, the upper cone 12 and the lower cone 13 move axially in sequence through the upper sealing assembly 3 and the lower sealing assembly 5, that is, the push cylinder 2 can make the base 7, the upper cone 12 and the lower cone 13 move downwards in sequence through the upper sealing assembly 3 and the lower sealing assembly 5, as shown in fig. 2. The upper slip bowl 9 may be gradually radially displaced from the axis of the base pipe 16 when the base 7 and the upper cone 12 are brought closer together, and the lower slip bowl 14 may be gradually radially displaced from the axis of the base pipe 16 when the lower cone 13 and the lower push ring 15 are brought closer together, thereby achieving anchoring support, as shown in fig. 2.
The operation of the split type all-metal sealing device will be described.
When the tool is put down, the split type all-metal sealing device is connected to the lower end of a setting tool, after the tool reaches a preset position, the upper end of the inner guide cylinder 1 is connected with a central tube of the setting tool and is kept fixed, the outer cylinder of the setting tool pushes the push cylinder 2 to move downwards, and the circular ring section 202 on the push cylinder 2 pushes the upper sealing assembly 3 (the upper sealing block 301 and the upper sealing rubber strip 4) to move downwards. In the process that the push cylinder 2 pushes the upper sealing assembly 3 to move downwards, the upper sealing block 301 of the upper sealing assembly 3 and the lower sealing block 501 of the lower sealing assembly 5 are overlapped gradually along the axial direction, the lower sealing assembly 5 also moves downwards, the upper sealing assembly 3 and the lower sealing assembly 5 are both gradually away from the axis of the central tube 16 along the radial direction, finally, the upper sealing assembly 3 and the lower sealing assembly 5 radially expand and are combined into a cylinder with complete circumferential direction, the upper sealing rubber strip 4 and the lower sealing rubber strip 6 are combined into a sealing ring with complete circumferential direction, and the lower end of the cylinder is abutted against the base 7, so that sealing support is realized.
Under the action of the push barrel 2, the base 7 continues to move downwards to push an upper slip composed of an upper slip seat 9 and ceramic particles 10, an upper cone 12 and a lower cone 13 to move downwards, the lower push ring 15 is connected with the inner guide barrel 1 through a central tube 16 to be kept fixed at the moment, the upper slip seat 9 and the lower slip seat 14 respectively do radial movement outwards on frustum structures of the upper cone 12, the base 7, the lower cone 13 and the lower push ring 15 and break an upper hoop 8 and a lower hoop 11, and the sleeve pipe is anchored and supported to achieve the purpose of setting.
After setting is finished, the central tube of the setting tool pulls the inner guide cylinder 1 upwards to break the central tube 16 at the annular groove 1601, and then the parts above the broken parts of the inner guide cylinder 1, the push cylinder 2 and the central tube 16 are lifted upwards to finish releasing.
All parts of the split type all-metal sealing device except the upper sealing rubber strip 4 and the lower sealing rubber strip 6 are made of metal materials, so that the split type all-metal sealing device is called as a split type all-metal sealing device. The split type all-metal sealing device can also be called a split type metal sealing device or a split type sealing device.
The split type all-metal sealing device has the following characteristics:
1. the overall structure mostly adopts a guide rail and a hollow structure, and after the setting action is finished, the inner guide cylinder 1, the push cylinder 2 and the central tube 16 are lifted upwards, the releasing is finished, the length of the sealing structure is reduced, the weight is obviously lightened, and the weight is about 8kg when the sealing structure is applied to a 5.5-inch well.
2. Designing a full alloy structure: the split upper sealing component 3 and the split lower sealing component 5 are obliquely installed and reach the base 7 through the movement of the inner guide cylinder 1 and the push cylinder 2 to complete sealing, so that the problem that the conventional rubber cylinder type deformation expansion sealing cannot be realized by a conventional metal structure is solved.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.
Claims (10)
1. The split type all-metal sealing device is characterized by comprising a central tube (16), wherein a setting mechanism and a slip mechanism which are arranged up and down are sleeved outside the central tube (16), the setting mechanism comprises an inner guide tube (1), a push tube (2), an upper sealing assembly (3) and a lower sealing assembly (5), the central tube (16), the inner guide tube (1) and the push tube (2) are sequentially sleeved from inside to outside, the upper sealing assembly (3) and the lower sealing assembly (5) are arranged up and down, the upper sealing assembly (3) comprises a plurality of upper sealing blocks (301) which are arranged at intervals along the circumferential direction, the lower sealing assembly (5) comprises a plurality of lower sealing blocks (501) which are arranged at intervals along the circumferential direction, a gap is formed between every two adjacent lower sealing blocks (501), the upper sealing blocks (301) correspond to the gap one by one, and in the process that the push tube (2) pushes the upper sealing assembly (3) to move downwards along the axial direction, the upper sealing assembly (3) and the lower sealing assembly (5) are overlapped gradually along the axial direction, the upper sealing assembly (3) and the lower sealing assembly (5) are gradually far away from the axis of the central pipe (16) along the radial direction, and the upper sealing assembly (3) and the lower sealing assembly (5) can be combined into a cylinder which is complete in the circumferential direction.
2. The split type all-metal sealing device according to claim 1, wherein the central tube (16) is in an upright state, the central tube (16) is fixedly connected with the inner guide cylinder (1), the push cylinder (2) comprises a cylindrical section (201), a circular section (202) and a conical section (203) which are sequentially arranged from top to bottom, and the upper sealing assembly (3) and the lower sealing assembly (5) are both positioned outside the conical section (203).
3. The split type all-metal sealing device is characterized in that the conical surface section (203) comprises a plurality of split claws (204) which are arranged at intervals along the circumferential direction, the number of the split claws (204) is equal to the sum of the number of the upper sealing blocks (301) and the number of the lower sealing blocks (501), and the intervals between two adjacent split claws (204) form axial guide grooves (205) and axial insertion grooves (206) which are alternately arranged along the circumferential direction of the push cylinder (2).
4. The split type all-metal sealing device according to claim 3, wherein the lower portion of the inner guide cylinder (1) is provided with outer convex ribs (101), the outer convex ribs (101) are correspondingly inserted into the axial insertion grooves (206), and outer sliding grooves (102) are formed in the outer surfaces of the outer convex ribs (101).
5. The split type all-metal sealing device according to claim 4, wherein the distance from the upper end of the outer chute (102) to the axis of the central tube (16) is smaller than the distance from the lower end of the outer chute (102) to the axis of the central tube (16), an inner sliding block (302) is arranged on the inner surface of the upper sealing block (301), the inner sliding block (302) is in matched insertion connection with the outer chute (102), and the upper sealing block (301) can slide along the outer chute (102) by means of the inner sliding block (302).
6. The split type all-metal sealing device according to claim 5, wherein the outer sliding ways (103) are arranged on two sides of the outer sliding groove (102), the outer sliding ways (103) are parallel to the outer sliding groove (102), the inner sliding block (302) is connected with the outer sliding ways (103) through a first pin shaft (303), and the axis of the first pin shaft (303) is perpendicular to the axis of the central pipe (16).
7. The split type all-metal sealing device according to claim 3, wherein the base (7) is sleeved outside the central tube (16), the base (7) is located below the lower sealing component (5), the base (7) is of a sleeve type structure, the base (7) comprises an inner cylinder (701) and an outer cylinder (702), the inner cylinder (701) and the outer cylinder (702) are connected through a first connecting plate (703), an axially through channel is formed between the inner cylinder (701) and the outer cylinder (702), the upper part of the first connecting plate (703) can be inserted into the axially guiding groove (205), the upper end surface of the first connecting plate (703) is an inclined surface, the inner end of the inclined surface is higher than the outer end of the inclined surface, a through hole sliding groove (705) is arranged in the upper end of the first connecting plate (703), the through hole sliding groove (705) is of a long strip shape, and the through hole sliding groove (705) is parallel to the inclined surface, the lower sealing block (501) is connected with the through hole sliding groove (705) through a second pin shaft (502), the axis of the second pin shaft (502) is perpendicular to the axis of the central pipe (16), and the lower sealing block (501) can slide along the through hole sliding groove (705).
8. The split type all-metal sealing device according to claim 1, wherein the upper sealing block (301) is of a trapezoidal structure with the top end facing downwards and the bottom end facing upwards after being unfolded laterally, the lower sealing block (501) is of a trapezoidal structure with the top end facing upwards and the bottom end facing downwards after being unfolded laterally, and when the upper sealing assembly (3) and the lower sealing assembly (5) are combined into a cylinder with complete circumferential direction, the contact surfaces of the upper sealing block (301) and the lower sealing block (501) are matched;
the outer surface of the upper sealing block (301) is embedded with an arc-shaped upper sealing rubber strip (4), the outer surface of the lower sealing block (501) is embedded with an arc-shaped lower sealing rubber strip (6), and when the upper sealing assembly (3) and the lower sealing assembly (5) are combined into a cylinder with complete circumferential direction, the upper sealing rubber strip (4) and the lower sealing rubber strip (6) can be combined into a circular ring with complete circumferential direction.
9. The split type all-metal sealing device according to claim 1, wherein the slip mechanism comprises a base (7), an upper cone (12), a lower cone (13) and a lower push ring (15) which are sequentially arranged from top to bottom, a plurality of upper slip seats (9) are arranged between the base (7) and the upper cone (12), a plurality of lower slip seats (14) are arranged between the lower cone (13) and the lower push ring (15), the upper slip seats (9) and the lower slip seats (14) can be gradually away from the axis of the central tube (16) along the radial direction, and the inner guide tube (1), the push tube (2), the upper sealing assembly (3), the lower sealing assembly (5), the base (7), the upper cone (12), the lower cone (13), the lower push ring (15) and the central tube (16) are all made of soluble alloy.
10. The split type all-metal sealing device according to claim 1, wherein the base (7), the upper cone (12) and the lower cone (13) can move along the axial direction of the central tube (16), the lower push ring (15) is fixedly connected with the central tube (16), an annular groove (1601) is formed in the lower portion of the central tube (16), the axial position of the annular groove (1601) corresponds to the axial position of the lower slip seat (14), and when the upper end of the central tube (16) is pulled upwards, the central tube (16) can be broken at the annular groove (1601).
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| CN202010020658.4A CN113107413B (en) | 2020-01-09 | 2020-01-09 | Split type all-metal sealing device |
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| CN202010020658.4A CN113107413B (en) | 2020-01-09 | 2020-01-09 | Split type all-metal sealing device |
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| CN116733413A (en) * | 2023-05-31 | 2023-09-12 | 江苏腾龙石化机械有限公司 | Guiding self-dissolving type soluble bridge plug |
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| CN113107413B (en) | 2022-06-03 |
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