CN111927363A - High pressure difference resistant hydraulic anchor - Google Patents
High pressure difference resistant hydraulic anchor Download PDFInfo
- Publication number
- CN111927363A CN111927363A CN202010871906.6A CN202010871906A CN111927363A CN 111927363 A CN111927363 A CN 111927363A CN 202010871906 A CN202010871906 A CN 202010871906A CN 111927363 A CN111927363 A CN 111927363A
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- CN
- China
- Prior art keywords
- anchor
- fluke
- hole
- pressure difference
- tool
- 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.)
- Pending
Links
- 241000935974 Paralichthys dentatus Species 0.000 claims abstract description 58
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000004873 anchoring Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 4
- 238000011900 installation process Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 3
- 241000242541 Trematoda Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a high pressure difference resistant hydraulic anchor, which comprises an anchor body, wherein an anchor hole is formed in the anchor body along the radial direction of the anchor body, an anchor fluke is arranged in the anchor hole, the anchor fluke is a solid cylinder inserted into the anchor hole from the inner cavity of the anchor body, a flange is arranged at one end of the anchor fluke, which points to the axis of the anchor body, an elastic part is arranged between the anchor fluke and the anchor hole, a liner pipe for supporting the anchor fluke is further arranged in the inner cavity of the anchor body, a slot is formed in the liner pipe, and at least two O-shaped rubber sealing rings for hydraulic gas are arranged between the anchor fluke. The structure and the installation process of the anchor fluke are improved on the basis of the structure of the original hydraulic anchor, and the sealing ring is additionally arranged on one side of the original sealing ring in parallel by utilizing the structural characteristics of the novel anchor fluke, so that the bearing capacity of a tool is increased, liquid can be prevented from seeping out of an anchor hole when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body, and the problems that the traditional hydraulic anchor cannot resist high pressure difference and sand is stuck are solved.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a high pressure difference resistant hydraulic anchor.
Background
At oil gas well later stage fracturing in-process, for preventing the cluster of fracturing string from moving, increase the anchor module usually, but domestic anchor structure singleness is offered the anchor eye usually on the anchor block, installs the fluke in the anchor eye, and the external preforming of installing fixed fluke of anchor block, and the shortcoming that this kind of anchoring structure exists has:
1. because of the existence of the pressing sheet, a clamping groove for embedding the pressing sheet is formed in the anchor fluke, the anchor fluke is of a U-shaped structure, the bottom of the anchor fluke is thin, only one sealing ring can be installed in an outer circle sealing groove of the anchor fluke, in engineering, according to the design requirement of GBT 3452.2-2007O-shaped rubber sealing ring for hydraulic and pneumatic pressure, the pressure difference borne by the one sealing ring is less than 35 Mpa, when high pressure difference occurs between an oil pipe and a sleeve, liquid in the anchor body can seep out through the sealing ring, sand in the liquid can precipitate to form a sand plug, the rebound space of the anchor fluke is limited, and the sleeve clamping phenomenon is generated.
2. Traditional hydraulic anchor passes through cylindrical spring return, and cylindrical spring sets up between preforming and draw-in groove, and because of installation space's limitation, the resilience force that cylindrical spring produced is less, often causes the sand card because of the inside remaining fracturing fine sand of instrument in the actual application, and unable abundant resilience produces the card tubular column phenomenon in the sleeve pipe.
In conclusion, the traditional hydraulic anchor has poor high pressure resistance, and the fluke is not easy to reset when the hydraulic anchor works in a high pressure difference environment.
Disclosure of Invention
The invention aims to provide a high pressure difference resistant hydraulic anchor which can solve the problems that a traditional hydraulic anchor is not resistant to high pressure difference and sand is stuck.
In order to achieve the purpose, the technical scheme of the invention is as follows: a high pressure difference resistant hydraulic anchor comprises an anchor body, wherein an anchor hole is formed in the anchor body in the radial direction of the anchor hole, an anchor claw is arranged in the anchor hole, an anchor tooth is arranged on the outer end face of the anchor claw, the anchor claw is a solid cylinder which is inserted into the anchor hole from an inner cavity of the anchor body, pressure is suppressed through the inside of an oil pipe, the liquid pressure in the inner cavity of the anchor body is increased, pressure difference is generated inside and outside a tool, the anchor claw extends out of the anchor hole under the action of the pressure difference, the anchor tooth is embedded into the wall of a sleeve, the tool is limited from moving up and;
a flange is arranged at one end of the anchor fluke, which points to the axis of the anchor body, and the flange is matched with the inner opening of the anchor hole, so that the anchor fluke is prevented from falling out of the anchor body;
an elastic piece is arranged between the anchor fluke and the anchor hole, in the anchoring process, the anchor fluke extends out of the anchor hole and simultaneously extrudes and compresses the elastic piece, after the pressure is stopped, the pressure difference between the inside and the outside of the tool is eliminated, and the elastic piece enables the anchor fluke to reset under the elastic action of the elastic piece to release anchoring;
the inner cavity of the anchor body is also provided with a liner pipe for supporting the anchor fluke, so that the anchor fluke is prevented from withdrawing from the anchor hole when the tool goes into the well or the anchoring is released, and the tool is prevented from losing efficacy;
the liner pipe is provided with a slot, and well fluid enters the inner cavity of the anchor body through the slot in the process of descending the well by the tool, so as to filter coarse sand;
at least two hydraulic-pneumatic O-shaped rubber sealing rings are arranged between the anchor fluke and the anchor hole in parallel, so that when the pressure bearing capacity of the tool is increased, liquid can be prevented from seeping out of the anchor hole when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body, and the resilience space of the anchor fluke is limited.
Preferably, the elastic member is a disc spring. Because the limitation of installation space, the elastic component is shorter, and the resilience force that can produce is less, and dish spring elastic performance is superior, can improve the resilience force of elastic component in the confined space greatly, guarantees that the fluke resets, removes the anchoring.
The invention has the beneficial effects that: the structure and the installation process of the anchor fluke are improved on the basis of the structure of the original hydraulic anchor, and the sealing ring is additionally arranged on one side of the original sealing ring in parallel by utilizing the structural characteristics of the novel anchor fluke, so that the bearing capacity of a tool is increased, liquid can be prevented from seeping out of an anchor hole when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body, and the problems that the traditional hydraulic anchor cannot resist high pressure difference and sand is stuck are solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a graph showing fluid flow analysis of the lumen of the anchor body at the current differential pressure.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1-2, a high pressure difference resistant hydraulic anchor comprises an anchor body 1, an anchor hole 2 arranged along the radial direction of the anchor body 1 is arranged on the anchor body 1, an anchor fluke 3 is arranged in the anchor hole 2, an anchor tooth is arranged on the outer end face of the anchor fluke 3, the anchor fluke 3 is a solid cylinder inserted into the anchor hole 2 from the inner cavity of the anchor body 1, through suppressing pressure in an oil pipe, the liquid pressure in the inner cavity of the anchor body 1 is increased, a pressure difference is generated inside and outside a tool, the anchor fluke 3 extends out of the anchor hole 2 under the action of the pressure difference, the anchor tooth is embedded into the wall of a casing, the tool is limited;
a flange 31 is arranged at one end of the fluke 3, which points to the axis of the anchor body 1, and the flange 31 is matched with the inner opening of the anchor hole 2, so that the fluke 3 is prevented from falling out of the anchor body 1;
an elastic part 7 is arranged between the anchor fluke 3 and the anchor hole 2, in the anchoring process, the anchor fluke 3 extends out of the anchor hole 2 and simultaneously extrudes and compresses the elastic part 7, after the pressure is stopped, the pressure difference between the inside and the outside of the tool is eliminated, and the elastic part 7 enables the anchor fluke 3 to reset under the elastic action of the elastic part 7 to release the anchoring;
the inner cavity of the anchor body 1 is also provided with a liner pipe 5 for supporting the fluke 3, so that the problem that the anchor fluke 3 is withdrawn from the anchor hole 2 to cause tool failure when the tool is put into a well or the anchoring is released is avoided;
the liner pipe 5 is provided with a slot (not shown in the figure), and well fluid enters the inner cavity of the anchor body 1 through the slot to filter coarse sand during the process of going down the well by the tool;
at least two hydraulic air pressure O-shaped rubber sealing rings 4 are arranged between the anchor fluke 3 and the anchor eye 2 in parallel, so that when the pressure bearing capacity of the tool is increased, liquid can be prevented from seeping out of the anchor eye 2 when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body 1, and the rebound space of the anchor fluke 3 is limited.
The high pressure difference resistant hydraulic anchor is characterized in that the anchor fluke 3 is a solid cylinder, compared with a traditional anchor fluke with a groove in the middle, at least two sealing rings 4 can be arranged between the anchor fluke and the anchor hole 2, according to the design requirement of GBT 3452.2-2007O-shaped rubber sealing ring for hydraulic and pneumatic, the pressure difference which can be borne by the tool is not less than 70Mpa, and therefore liquid can be prevented from penetrating through the sealing rings 4 to seep out from the anchor hole 2 when the pressure difference is large, and sand blocking is formed. The specific analysis is as follows:
as shown in fig. 3, the tool comprises a first sealing ring 8 and a second sealing ring 9, when the internal and external pressure difference of the tool exceeds 35 Mpa but is less than 70Mpa, because the first sealing ring 8 can only bear the pressure difference of 35 Mpa, the liquid in the inner cavity of the anchor body permeates between the first sealing ring 8 and the second sealing ring 9 after being blocked by the first sealing ring 8, and the pressure difference between the blocked liquid and the liquid outside the tool is less than 35 Mpa, the double sealing rings can enable the tool to be suitable for the working environment when the pressure difference exceeds 35 Mpa but is less than 70Mpa, and the limitation of the resilience space of the fluke caused by the seepage of the liquid is ensured.
However, the flukes of the traditional hydraulic anchor are fixed outside, and the middle part of the fluke needs to be grooved, so that the problem solved by the invention cannot be solved by the traditional hydraulic anchor.
Further, the elastic member 7 is a disc spring. Because installation space's limitation, the elastic component is shorter, and the resilience force that can produce is less, and dish spring elastic performance is superior, can improve the resilience force of elastic component in the confined space greatly, guarantees fluke 3 and resets, removes the anchoring.
The structure and the installation process of the anchor fluke are improved on the basis of the structure of the original hydraulic anchor, and the sealing ring is additionally arranged on one side of the original sealing ring in parallel by utilizing the structural characteristics of the novel anchor fluke, so that the bearing capacity of a tool is increased, liquid can be prevented from seeping out of an anchor hole when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body, and the problems that the traditional hydraulic anchor cannot resist high pressure difference and sand is stuck are solved.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
Claims (2)
1. A high pressure difference resistant hydraulic anchor comprises an anchor body, wherein an anchor hole is formed in the anchor body along the radial direction of the anchor body, an anchor claw is arranged in the anchor hole, and an anchor tooth is arranged on the outer end face of the anchor claw;
a flange is arranged at one end of the anchor fluke, which points to the axis of the anchor body, and the flange is matched with the inner opening of the anchor hole, so that the anchor fluke is prevented from falling out of the anchor body;
an elastic piece is arranged between the anchor fluke and the anchor hole, in the anchoring process, the anchor fluke extends out of the anchor hole and simultaneously extrudes and compresses the elastic piece, after the pressure is stopped, the pressure difference between the inside and the outside of the tool is eliminated, and the elastic piece enables the anchor fluke to reset under the elastic action of the elastic piece to release anchoring;
the inner cavity of the anchor body is also provided with a liner pipe for supporting the anchor fluke, so that the anchor fluke is prevented from withdrawing from the anchor hole when the tool goes into the well or the anchoring is released, and the tool is prevented from losing efficacy;
the liner pipe is provided with a slot, and well fluid enters the inner cavity of the anchor body through the slot in the process of descending the well by the tool, so as to filter coarse sand;
at least two hydraulic-pneumatic O-shaped rubber sealing rings are arranged between the anchor fluke and the anchor hole in parallel, so that when the pressure bearing capacity of the tool is increased, liquid can be prevented from seeping out of the anchor hole when the pressure difference is large, fine sand is precipitated in the inner cavity of the anchor body, and the resilience space of the anchor fluke is limited.
2. A differential pressure water anchor as claimed in claim 1, wherein said resilient member is a disc spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010871906.6A CN111927363A (en) | 2020-08-26 | 2020-08-26 | High pressure difference resistant hydraulic anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010871906.6A CN111927363A (en) | 2020-08-26 | 2020-08-26 | High pressure difference resistant hydraulic anchor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111927363A true CN111927363A (en) | 2020-11-13 |
Family
ID=73305858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010871906.6A Pending CN111927363A (en) | 2020-08-26 | 2020-08-26 | High pressure difference resistant hydraulic anchor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111927363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991708A (en) * | 2022-05-30 | 2022-09-02 | 盐城他山石液压机械有限公司 | Anti-loosening self-locking bridge plug |
-
2020
- 2020-08-26 CN CN202010871906.6A patent/CN111927363A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991708A (en) * | 2022-05-30 | 2022-09-02 | 盐城他山石液压机械有限公司 | Anti-loosening self-locking bridge plug |
| CN114991708B (en) * | 2022-05-30 | 2023-09-12 | 盐城他山石液压机械有限公司 | Locking auto-lock bridging plug that moves |
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| SE01 | Entry into force of request for substantive examination | ||
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