CN114658385B - Hydraulic expansion type open hole packer - Google Patents
Hydraulic expansion type open hole packer Download PDFInfo
- Publication number
- CN114658385B CN114658385B CN202011527564.2A CN202011527564A CN114658385B CN 114658385 B CN114658385 B CN 114658385B CN 202011527564 A CN202011527564 A CN 202011527564A CN 114658385 B CN114658385 B CN 114658385B
- Authority
- CN
- China
- Prior art keywords
- sealing
- pressure
- liquid
- rubber cylinder
- pressure relief
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 claims abstract description 108
- 238000007789 sealing Methods 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 62
- 239000007924 injection Substances 0.000 claims abstract description 62
- 230000000903 blocking effect Effects 0.000 claims abstract description 35
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000012856 packing Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 8
- 238000004880 explosion Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 2
- 230000009172 bursting Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The invention provides a hydraulic expansion type open hole packer, which comprises a sealing rubber sleeve, an outer sleeve, a central tube with a liquid inlet, a rubber sleeve liquid injection channel, a pressure relief assembly and a plugging piston, wherein the rubber sleeve liquid injection channel is formed by encircling the central tube and the outer sleeve and communicated with the liquid inlet; the starting pressure of the pressure relief assembly is larger than the preset expansion sealing pressure of the sealing and pressing rubber cylinder; the blocking piston is arranged in the rubber cylinder liquid injection channel and retreats to block the liquid inlet after the pressure relief assembly is opened. The invention has the advantages of preventing the packer from being sealed by secondary expansion during fracturing, having good adaptability to pump pressure fluctuation and the like.
Description
Technical Field
The invention relates to the field of oilfield exploitation, in particular to a hydraulic expansion type open hole packer.
Background
Open hole staged fracturing is one of the effective processes for improving single well production and realizing single well uphole production. The open hole packer is a key tool for open hole interlayer segmentation, and at present, the open hole packer of a hydraulic drive compression rubber cylinder is adopted for annulus packing. However, for fractured reservoirs such as carbonate rock, the well diameter is irregular, the well expansion rate is generally large, and at this time, the open hole packer with the conventional compression rubber sleeve structure cannot be used for reliable and effective packing.
In order to solve the technical problems, hydraulic expansion type open hole packers are generally adopted in the prior art to meet the reliable packing requirement of irregular wellbores. However, when the hydraulic expansion packer rubber cylinder is applied to open hole staged fracturing operation, as the pumping of fracturing fluid and the reduction of the environmental temperature, the pressure of the fluid in the hydraulic expansion packer rubber cylinder is reduced due to the effect of thermal expansion and cold contraction, the condition of secondary fluid inlet expansion sealing can occur in the fracturing process of the existing packer, and the risk of bursting of the packer is caused.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the hydraulic expansion open hole packer which can prevent the packer from being secondarily sealed during fracturing and has good adaptability to pump pressure fluctuation.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the hydraulic expansion type open hole packer comprises a sealing and pressing rubber sleeve, an outer sleeve, a central tube with a liquid inlet, a rubber sleeve liquid injection channel, a pressure relief assembly and a plugging piston, wherein the rubber sleeve liquid injection channel is formed by enclosing the central tube and the outer sleeve and communicated with the liquid inlet, and the pressure relief assembly is arranged on the outer sleeve and communicated with an external annulus; the starting pressure of the pressure relief assembly is larger than the preset expansion sealing pressure of the sealing and pressing rubber cylinder; the blocking piston is arranged in the rubber cylinder liquid injection channel and retreats to block the liquid inlet after the pressure relief assembly is opened.
As a further improvement of the above technical scheme:
the pressure relief assembly comprises a pressure relief channel, a blasting valve and a one-way valve for preventing annular liquid from entering the packer, and the pressure relief channel is arranged at the position of the outer sleeve close to the liquid inlet; the one-way valve and the explosion valve are installed in the pressure relief channel, and the explosion pressure of the explosion valve is the starting pressure of the pressure relief assembly.
And a first sealing piece is arranged between the two end parts of the plugging piston and the central tube, and the first sealing piece is positioned at the two sides of the liquid inlet hole when the liquid inlet hole is plugged.
A compression spring is arranged on the moving stroke of the blocking piston, and is arranged between the blocking piston and the outer sleeve in a compressed mode when the blocking piston is fixed; when the pressure relief assembly is opened, the blocking piston retreats under the hydraulic action of the compression spring and the sealing rubber cylinder.
The plugging piston is fixed in the rubber cylinder liquid injection channel through a positioning component when the packer enters a well, the positioning component comprises a shear pin sleeve and a shear pin, and the shear pin sleeve is arranged on the inner side wall of the outer sleeve; the shear pin is arranged between the blocking piston and the shear pin sleeve and is sheared when the liquid is injected to hold pressure.
The outer sleeve comprises an upper joint, a mounting joint and a connecting shell which are sequentially connected, the mounting joint, the connecting shell and the central tube are enclosed to form the rubber cylinder liquid injection channel, and the rubber cylinder liquid injection channel is communicated with the inner cavity of the sealing and pressing rubber cylinder through a flowing through hole arranged on the connecting shell; the pressure relief assembly is arranged on the mounting joint; the sealing and pressing rubber cylinder is connected with the connecting shell.
The sealing piston comprises a sealing section and a limiting section, the sealing section is sleeved in the mounting joint, and the sealing section moves and breaks away from the mounting joint after the sealing rubber cylinder liquid injection is started so as to open the rubber cylinder liquid injection channel; the limiting section is in axial limiting fit with the mounting joint when the liquid inlet is plugged.
The limiting sections are a plurality of limiting convex parts which are arranged at intervals along the circumferential direction of the plugging piston, and through-flow grooves for the passage of injection liquid are formed between the adjacent limiting convex parts.
And second sealing elements for preventing liquid from leaking are arranged between the sealing section and the mounting joint and between the sealing section and the central tube.
The upper joint is provided with a third sealing piece for preventing liquid from leaking out, and the connection positions of the upper joint, the installation joint and the connection shell are respectively provided with a third sealing piece for preventing liquid from leaking out.
Compared with the prior art, the invention has the advantages that:
according to the invention, the pressure release assembly and the plugging piston are combined, so that the plugging piston can reach the liquid inlet position to realize permanent plugging, and after plugging, no matter how high the pressure is, the liquid cannot enter the rubber cylinder liquid injection channel, thereby effectively avoiding the occurrence of secondary expansion sealing of the sealing rubber cylinder when the upper open hole section of the packer is fractured, and ensuring the sealing reliability of the packer in the operation process. Specifically, after the packing element notes liquid and expands and seal, the pressure release subassembly is opened, packing element notes liquid passageway and outside annular space intercommunication, the pressure in the center tube will be discharged outside annular space through the pressure release subassembly, and it makes the inside and outside pressure balance of packer, seals the high pressure of packing element position, and at this moment, shutoff piston will fall back, the pressure that the pressure release subassembly can be with the back production and liquid discharge outside annular space for shutoff piston can effectively remove to the feed liquor hole site and realize the shutoff.
Meanwhile, the starting pressure of the pressure relief assembly is larger than the preset expansion pressure of the sealing rubber cylinder, so that the packer has good adaptability to pump pressure fluctuation during liquid injection expansion sealing, the liquid injection caused by the pump pressure fluctuation can be effectively prevented from being permanently closed in advance, and the reliable and effective operation of the packer is ensured. Specifically, the pressure release assembly is always in a closed state when the filling expansion seal does not reach the starting pressure, and when the ground operation or the filling pump has a problem and is required to stop the pump, the pressure release assembly is not opened to release the pressure, and at the moment, the pressure release assembly returns to the initial position, so that the pressure release assembly does not block the liquid inlet; when the liquid is injected in the subsequent pressure rising process, the blocking piston moves downwards continuously, the sealing rubber cylinder starts to inject liquid, the pressure release assembly is opened only when the expansion seal meets the requirement and the injection pressure reaches the opening pressure of the pressure release assembly, and at the moment, the liquid inlet can be blocked by the blocking piston. That is, the rubber cylinder liquid injection channel is not permanently closed no matter how the liquid pressure fluctuates or any abnormal situation exists on the ground before the liquid injection pressure reaches the opening pressure of the pressure release assembly. Therefore, the invention has the advantages of well adapting to pump pressure fluctuation and preventing the injection from being closed in advance while preventing secondary expansion sealing in the fracturing process.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic illustration of the structure (initial state) of a hydraulically expandable open hole packer of the present invention.
FIG. 2 is a schematic diagram of the structure of a hydraulically expandable open hole packer (fluid injection state) of the present invention.
FIG. 3 is a schematic view of the structure of the hydraulically expanded open hole packer of the present invention (plugged condition).
Fig. 4 is a schematic structural view of a pressure relief assembly according to the present invention.
Fig. 5 is a schematic structural view of the plugging piston of the present invention.
The reference numerals in the drawings denote:
1. sealing and pressing a rubber cylinder; 2. an outer sleeve; 21. an upper joint; 22. installing a joint; 23. a connection housing; 231. a through-flow hole; 3. a central tube; 31. a liquid inlet hole; 4. a rubber cylinder liquid injection channel; 5. a pressure relief assembly; 51. a pressure relief channel; 52. a burst valve; 53. a one-way valve; 531. a valve core; 532. a valve core spring; 6. plugging the piston; 61. a sealing section; 62. a limiting section; 621. a limit protrusion; 622. a flow trough; 7. a sealing member; 71. a first seal; 72. a second seal; 73. a third seal; 8. a compression spring; 9. a positioning member; 91. a shear pin sleeve; 92. and (5) cutting nails.
Detailed Description
The invention will now be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the hydraulic expansion type open hole packer of the present embodiment includes a packing rubber 1, an outer sleeve 2, a center tube 3 and a rubber injection passage 4. Wherein the central tube 3 is provided with a liquid inlet hole 31; the rubber cylinder liquid injection channel 4 is formed by enclosing the central tube 3 and the outer sleeve 2, and meanwhile, the rubber cylinder liquid injection channel 4 is communicated with the liquid inlet hole 31 so as to convey pump liquid to the sealing rubber cylinder 1 through the central tube 3 and the rubber cylinder liquid injection channel 4 to complete expansion sealing. In the embodiment, the hydraulic expansion type open hole packer further comprises a pressure relief assembly 5 and a plugging piston 6, wherein the pressure relief assembly 5 is arranged on the outer sleeve 2, and two ends of the pressure relief assembly 5 are communicated with the rubber cylinder liquid injection channel 4 and an external annulus; the starting pressure of the pressure relief assembly 5 is larger than the preset expansion sealing pressure of the sealing and pressing rubber cylinder 1; the blocking piston 6 is arranged in the rubber cylinder liquid injection channel 4, and the blocking piston 6 retreats to the blocking liquid inlet hole 31 after the pressure relief assembly 5 is opened.
According to the invention, the pressure release assembly 5 and the blocking piston 6 are combined, so that the blocking piston 6 can reach the position of the liquid inlet hole 31 to realize permanent blocking, the central tube 3 after blocking does not enter the rubber cylinder liquid injection channel 4 no matter how high the pressure is, the occurrence of secondary expansion sealing of the sealing rubber cylinder 1 during fracturing of the upper open hole section of the packer is effectively avoided, and the reliability and safety of the packer in the operation process are ensured. Specifically, after the packing element 1 is filled with liquid and expands and seals, the pressure release subassembly 5 is opened, the packing element is filled with liquid passageway 4 and outside annular space intercommunication, the pressure in the center tube 3 will be discharged to outside annular space through the pressure release subassembly 5, it makes the inside and outside pressure balance of packer, the packing element 1 position pressure is high, at this moment, shutoff piston 6 will fall back, pressure and the liquid that pressure release subassembly 5 can be with the production of falling back are discharged to outside annular space, make shutoff piston 6 can effectively remove to feed liquor hole 31 position and realize the shutoff.
Meanwhile, the starting pressure of the pressure relief assembly 5 is larger than the preset expansion pressure of the packing rubber 1, so that the packer has good adaptability to pump pressure fluctuation during liquid injection expansion, the liquid injection caused by pump pressure fluctuation can be effectively prevented from being permanently closed in advance, and the reliable and effective operation of the packer is ensured. Specifically, the pressure release assembly 5 is always in a closed state when the filling expansion seal does not reach the starting pressure, and when the ground operation or the filling pump has a problem and the pump is required to be stopped, the pressure release assembly 5 is not opened, the pressure of the plugging piston 6 cannot be released, and at the moment, the plugging piston 6 returns to the initial position and does not plug the liquid inlet hole 31; when the liquid is injected in the subsequent pressure rising process, the blocking piston 6 moves downwards continuously, the sealing and pressing rubber cylinder 1 starts to inject liquid, the pressure release assembly 5 is opened only when the expansion seal meets the requirement and the injection pressure reaches the opening pressure of the pressure release assembly 5, and at the moment, the liquid inlet hole 31 can be blocked by the blocking piston 6. That is, the pressure of the injection liquid does not cause permanent closing of the packing element injection channel 4 until the pressure of the injection liquid reaches the opening pressure of the pressure release assembly 5, regardless of fluctuation of the hydraulic pressure or any abnormal situation on the ground. Therefore, the invention has the advantages of well adapting to pump pressure fluctuation and preventing the injection from being closed in advance while preventing secondary expansion sealing in the fracturing process.
As shown in fig. 4, the pressure relief assembly 5 includes a pressure relief passage 51, a burst valve 52, and a check valve 53. Wherein, the two ends of pressure release channel 51 communicate packing element annotate liquid passageway 4 and outside annular space, and pressure release channel 51 locates the position that is close to feed liquor hole 31 of outer tube 2 to effectively arrange the pressure and the liquid in feed liquor hole 31 position to outside annular space, guarantee the effective shutoff of feed liquor hole 31. The check valve 53 and the explosion valve 52 are installed in the pressure release channel 51, the check valve 53 comprises a valve core 531 and a valve core spring 532, and the valve core 531 abuts against the conical hole of the pressure release channel 51 through the acting force of the valve core spring 532 so as to prevent annular liquid from entering the packer and avoid secondary expansion sealing of the sealing rubber cylinder 1. Meanwhile, the bursting pressure of the bursting valve 52 is the starting pressure of the pressure relief assembly 5, when the injection pressure reaches the bursting pressure of the bursting valve 52, the bursting valve 52 is ruptured, and at the moment, the rubber cylinder injection channel 4 is communicated with an external annulus so as to finish pressure relief and liquid drainage.
The pressure release assembly 5 of the embodiment has a simple structure, and can effectively prevent secondary expansion sealing of the sealing and pressing rubber cylinder 1 while guaranteeing reliable pressure release. In other embodiments, the pressure relief assembly 5 is within the scope of the present invention as long as the pressure relief channel 51 is capable of communicating when the pressure of the injection liquid reaches the opening pressure of the pressure relief assembly 5.
Further, first sealing members 71 are provided between both end portions of the plugging piston 6 and the center tube 3, and the first sealing members 71 are located on both sides of the liquid inlet hole 31 when the liquid inlet hole 31 is plugged. After the rubber cylinder liquid injection channel 4 is permanently plugged, the central tube 3 does not enter the rubber cylinder liquid injection channel 4 no matter how high the pressure is, and the secondary expansion sealing of the sealing and pressing rubber cylinder 1 is further prevented.
As shown in fig. 1 to 3, a compression spring 8 is provided on the displacement path of the blocking piston 6, the compression spring 8 being arranged in a compressed manner between the blocking piston 6 and the outer sleeve 2 when the blocking piston 6 is fixed. When the plugging piston 6 starts to move at the injection pressure, the compression spring 8 starts to compress; when the pressure release assembly 5 is opened, the blocking piston 6 is retracted under the elastic restoring force of the compression spring 8 and the hydraulic action of the sealing rubber cylinder 1, and the effective retraction of the blocking piston 6 is ensured by the arrangement of the compression spring 8.
Further, the plugging piston 6 is fixed in the packing element injection channel 4 by a positioning component 9 when the packer is put into the well, and the positioning component 9 comprises a shear pin sleeve 91 and a shear pin 92. Wherein the shear pin sleeve 91 is mounted on the inner side wall of the outer sleeve 2; the shear pin 92 is arranged between the blocking piston 6 and the shear pin sleeve 91, and the shear pin 92 shears when the injection is suppressed, so that the blocking piston 6 moves along the axial direction of the glue cylinder injection channel 4. The setting of the positioning component 9 ensures that the plugging piston 6 is reliably fixed before entering a well and injecting liquid, and realizes the expansion sealing of the sealing and pressing rubber cylinder 1 and the effective plugging of the liquid inlet hole 31 after liquid injection, thereby ensuring the reliable and safe operation of the packer.
Further, the outer sleeve 2 includes an upper joint 21, a mounting joint 22 and a connection housing 23, which are connected in this order. Wherein, the installation joint 22, the connection housing 23 and the central tube 3 are enclosed to form a rubber tube liquid injection channel 4, and the rubber tube liquid injection channel 4 is communicated with the inner cavity of the sealing and pressing rubber tube 1 through a through hole 231 arranged on the connection housing 23 so as to inject liquid into the sealing and pressing rubber tube 1. Meanwhile, the upper joint 21 is connected with the central tube 3, the pressure relief assembly 5 is arranged on the installation joint 22, the sealing and pressing rubber cylinder 1 is connected with the connection shell 23, and the shear pin sleeve 91 is installed on the inner side wall of the connection shell 23. The structure is simple, and the disassembly and the assembly are convenient.
Further, the plugging piston 6 comprises a sealing section 61 and a limiting section 62, the sealing section 61 is sleeved in the mounting joint 22, and the sealing section 61 moves and is separated from the mounting joint 22 after the injection of the sealing and pressing rubber cylinder 1 is started, at this time, the rubber cylinder injection channel 4 is opened, and effective expansion sealing of the sealing and pressing rubber cylinder 1 can be realized; meanwhile, the limiting section 62 is in axial limiting fit with the mounting connector 22 when the liquid inlet hole 31 is blocked, so that the blocking position of the blocking piston 6 is effectively fixed.
As shown in fig. 5, in the present embodiment, the limiting section 62 is a plurality of limiting protrusions 621, the plurality of limiting protrusions 621 are arranged at intervals along the circumferential direction of the plugging piston 6, and a through-flow groove 622 through which the injection liquid passes is formed between adjacent limiting protrusions 621. The sealing and pressing rubber cylinder 1 can effectively enter the sealing and pressing rubber cylinder 1 when the sealing and pressing rubber cylinder 1 is inflated while effective limit of the sealing and pressing piston 6 is guaranteed. In other embodiments, the limiting section 62 is configured and modified to ensure effective limiting and over-current protection.
Further, the second sealing member 72 is provided between the sealing section 61 and the mounting joint 22, and between the sealing section 61 and the center tube 3, and the second sealing member 72 between the sealing section 61 and the center tube 3 and the first sealing member 71 located at the upper side of the liquid inlet 31 when the liquid inlet 31 is plugged are the same sealing member. Meanwhile, the third sealing piece 73 is arranged at the connection positions of the upper joint 21 and the mounting joint 22, the mounting joint 22 and the connection housing 23, and the connection housing 23 and the sealing and pressing rubber cylinder 1. In this embodiment, the sealing members 7 are sealing rings, so as to prevent liquid from leaking, and ensure reliable and safe operation of the packer.
In this embodiment, the working process of the hydraulic expansion type open hole packer is as follows: when the packer is put in place, the wellhead pumps liquid, the shear pins 92 are sheared by pressure build-up, the plugging piston 6 moves under the action of hydraulic pressure, and the liquid enters the sealing and pressing rubber cylinder 1 through the rubber cylinder liquid injection channel 4 so as to realize expansion sealing; when the injection pressure reaches the bursting pressure of the bursting valve 52, the bursting valve 52 bursts, at the moment, the pumping is stopped, the liquid in the central tube 3 enters the external annulus through the pressure relief channel 51, the blocking piston 6 retreats under the action of the liquid pressure of the compression spring 8 and the sealing rubber cylinder 1, and the liquid inlet hole 31 of the central tube 3 is closed. At the moment, the rubber cylinder liquid injection channel 4 is permanently closed, and even if the pressure in the central tube 3 rises again, the blocking piston 6 cannot displace, so that the packer cannot be inflated secondarily; meanwhile, when the open hole section at the upper part of the packer is fractured, the check valve 53 ensures that annular liquid cannot enter the packer, and further ensures that secondary expansion sealing of the packer cannot occur.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (7)
1. The hydraulic expansion type open hole packer comprises a sealing and pressing rubber sleeve, an outer sleeve, a central tube with a liquid inlet hole and a rubber sleeve liquid injection channel, wherein the rubber sleeve liquid injection channel is formed by enclosing the central tube and the outer sleeve and is communicated with the liquid inlet hole; the starting pressure of the pressure relief assembly is larger than the preset expansion sealing pressure of the sealing and pressing rubber cylinder; the blocking piston is arranged in the rubber cylinder liquid injection channel and retreats to block the liquid inlet after the pressure relief assembly is opened;
the pressure relief assembly comprises a pressure relief channel, a blasting valve and a one-way valve for preventing annular liquid from entering the packer, and the pressure relief channel is arranged at the position of the outer sleeve close to the liquid inlet; the one-way valve and the explosion valve are arranged in the pressure relief channel, and the explosion pressure of the explosion valve is the starting pressure of the pressure relief assembly;
a compression spring is arranged on the moving stroke of the blocking piston, and is arranged between the blocking piston and the outer sleeve in a compressed mode when the blocking piston is fixed; when the pressure relief assembly is opened, the blocking piston retreats under the hydraulic action of the compression spring and the sealing rubber cylinder;
the plugging piston is fixed in the rubber cylinder liquid injection channel through a positioning component when the packer enters a well, the positioning component comprises a shear pin sleeve and a shear pin, and the shear pin sleeve is arranged on the inner side wall of the outer sleeve; the shear pin is arranged between the blocking piston and the shear pin sleeve and is sheared when the liquid is injected to hold pressure.
2. The hydraulically expanded open hole packer of claim 1, wherein a first seal is disposed between the two ends of the plugging piston and the center tube, the first seal being located on both sides of the feed port when the feed port is plugged.
3. The hydraulic expansion type open hole packer according to claim 2, wherein the outer sleeve comprises an upper joint, a mounting joint and a connecting shell which are sequentially connected, the mounting joint, the connecting shell and the central tube are enclosed to form the rubber cylinder liquid injection channel, and the rubber cylinder liquid injection channel is communicated with an inner cavity of the sealing and pressing rubber cylinder through a through-flow hole arranged on the connecting shell; the pressure relief assembly is arranged on the mounting joint; the sealing and pressing rubber cylinder is connected with the connecting shell.
4. The hydraulically expanded open hole packer of claim 3, wherein the plugging piston comprises a sealing section and a limiting section, the sealing section is sleeved in the installation joint, and the sealing section moves and breaks away from the installation joint after the packing element injection is opened to open the packing element injection channel; the limiting section is in axial limiting fit with the mounting joint when the liquid inlet is plugged.
5. The hydraulically expanded open hole packer of claim 4, wherein the limit segments are a plurality of limit protrusions circumferentially spaced along the plugging piston, and a flow channel for the passage of injection fluid is formed between adjacent ones of the limit protrusions.
6. The hydraulically expandable open hole packer of claim 5, wherein a second seal is provided between the seal segment and the installation sub, the seal segment and the center tube to prevent leakage of fluid.
7. The hydro-expandable open hole packer of claim 6, wherein the upper joint and the installation joint, the installation joint and the connection housing, and the connection location of the connection housing and the packing element are all provided with a third sealing element for preventing liquid from leaking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011527564.2A CN114658385B (en) | 2020-12-22 | 2020-12-22 | Hydraulic expansion type open hole packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011527564.2A CN114658385B (en) | 2020-12-22 | 2020-12-22 | Hydraulic expansion type open hole packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114658385A CN114658385A (en) | 2022-06-24 |
| CN114658385B true CN114658385B (en) | 2024-03-26 |
Family
ID=82025156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011527564.2A Active CN114658385B (en) | 2020-12-22 | 2020-12-22 | Hydraulic expansion type open hole packer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114658385B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079534A (en) * | 1959-03-09 | 1963-02-26 | Ass Elect Ind | Air or gas blast electric circuit breakers |
| CN202220580U (en) * | 2011-08-25 | 2012-05-16 | 中国石油化工股份有限公司 | Combined injection tool for external casing packer |
| CN202866741U (en) * | 2012-11-16 | 2013-04-10 | 中国石油集团渤海钻探工程有限公司 | Expanding open hole packer with hydraulic control lock |
| CN109441397A (en) * | 2018-12-06 | 2019-03-08 | 盐城市森鑫石油机械有限公司 | The back-washable self-test sealing packer of oilfield exploitation and its envelope, anti-flushing well method are tested certainly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120285695A1 (en) * | 2011-05-11 | 2012-11-15 | Schlumberger Technology Corporation | Destructible containers for downhole material and chemical delivery |
| GB2580906B (en) * | 2019-01-25 | 2022-12-07 | Pragma Well Tech Limited | Pressure actuated downhole device |
-
2020
- 2020-12-22 CN CN202011527564.2A patent/CN114658385B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079534A (en) * | 1959-03-09 | 1963-02-26 | Ass Elect Ind | Air or gas blast electric circuit breakers |
| CN202220580U (en) * | 2011-08-25 | 2012-05-16 | 中国石油化工股份有限公司 | Combined injection tool for external casing packer |
| CN202866741U (en) * | 2012-11-16 | 2013-04-10 | 中国石油集团渤海钻探工程有限公司 | Expanding open hole packer with hydraulic control lock |
| CN109441397A (en) * | 2018-12-06 | 2019-03-08 | 盐城市森鑫石油机械有限公司 | The back-washable self-test sealing packer of oilfield exploitation and its envelope, anti-flushing well method are tested certainly |
Non-Patent Citations (1)
| Title |
|---|
| 核电站用DN350爆破阀剪切盖的动力学分析;周劭;;核技术;20130410(04);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114658385A (en) | 2022-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9567822B2 (en) | Downhole tool having setting valve for packing element | |
| US10704358B2 (en) | Device and method for opening and stopping a toe valve | |
| EP1165934B1 (en) | Apparatus for maintaining uniform pressure within an expandable well tool | |
| CN102817575B (en) | Downhole blow-out preventer with automatic controlling and anchoring function | |
| US20220349282A1 (en) | Permanent packer and extended gas lift method using permanent packer | |
| AU2019394664B2 (en) | Annular barrier with valve unit | |
| WO2014153412A1 (en) | Casing mounted metering device | |
| CN114658385B (en) | Hydraulic expansion type open hole packer | |
| US20180252068A1 (en) | Packing Element Having a Bonded Petal Anti-Extrusion Device | |
| US10669811B2 (en) | Device for protecting a degradable pin for isolation system in an annular barrier | |
| CN113863888B (en) | Underground three-channel integrated blowout preventer for double-tube drilling | |
| CN209892156U (en) | Plugging bypass for leakage well | |
| US8973663B2 (en) | Pump through circulating and or safety circulating valve | |
| RU2777032C1 (en) | Set of equipment for multi-stage hydraulic fracturing | |
| US20220098954A1 (en) | Annular barrier with pressure-intensifying unit | |
| RU2802635C1 (en) | Packer with a four-section hydraulic setting chamber | |
| CN114909104A (en) | Hydraulic expansion type open hole packer capable of being closed permanently | |
| US20230349258A1 (en) | Protection apparatus on swellable packers to prevent fluid reaction | |
| EP3978722A1 (en) | Annular barrier with pressure-intensifying unit | |
| CN113338846A (en) | Packing type stage cementing device | |
| CN116104442A (en) | Expansion type open hole packer | |
| CN115596386A (en) | Naked eye anchor | |
| CN110821440A (en) | Packer | |
| CN116025306A (en) | Self-anchored balanced expansion packer | |
| CN111852389A (en) | Well cementing device for controlling shearing deformation of casing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |