CN111456665A - Soluble expansion patching device and method - Google Patents
Soluble expansion patching device and method Download PDFInfo
- Publication number
- CN111456665A CN111456665A CN202010366731.3A CN202010366731A CN111456665A CN 111456665 A CN111456665 A CN 111456665A CN 202010366731 A CN202010366731 A CN 202010366731A CN 111456665 A CN111456665 A CN 111456665A
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- Prior art keywords
- expansion
- pipe
- bottom plug
- sealing
- ball
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000002195 soluble material Substances 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- 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)
- Earth Drilling (AREA)
Abstract
The invention discloses a dissolvable expansion patching device and a dissolvable expansion patching method, which comprise a connecting pipe, an expansion head, a bottom plug, a ball seat and a sealing ball; the outer wall of the expansion pipe is provided with a sealing strip, the connecting pipe is positioned in the expansion pipe, the expansion head is arranged on the circumferential surface of the bottom of the connecting pipe, the diameter of the expansion head is larger than the inner diameter of the expansion pipe, the bottom of the expansion pipe is hermetically connected with a bottom plug, the center of the bottom plug is provided with an axial through hole, and the bottom plug is coaxially connected with a ball seat; a sealing ball is arranged on the ball seat; the bottom plug, the ball seat and the sealing ball are all made of water-soluble materials. After the patching is finished, the bottom plug, the ball seat and the sealing ball can be dissolved by water, so that the bottom plug fishing operation after the patching is finished is avoided, a large number of working procedures are saved, the well repairing time is obviously shortened, and the recovery of production is accelerated.
Description
Technical Field
The invention belongs to the field of oil and gas field development casing damage well treatment, and relates to a dissolvable expansion patching device and method.
Background
The casing patching technology is introduced into a casing damage treatment process in China from the United states from the end of the 20 th century and the 80 th year, and at present, the casing patching technology mainly comprises three patching processes of corrugated pipe patching, reinforcing pipe patching and expansion pipe patching. The expansion pipe patching technology has the advantages of rapid development of pipe performance improvement and construction process optimization progress, wide application field and relatively high construction success rate. The expansion pipe patching is a very effective means for treating casing damage wells, can realize patching and permanent sealing of damaged parts of the casing, and the expansion pipe after patching is permanently attached to the inner wall of the damaged casing, so that the patching and reinforcing effects are good. However, after the patching of the existing expansion pipe patching technology is finished, the expansion pipe needs to be re-drilled to salvage bottom plugs, so that the construction cost is increased, the well occupying time is prolonged, and the difficulty is brought to the quick production and re-injection of oil, gas and water wells.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a soluble expansion patching device and a soluble expansion patching method, so that the fishing bottom plugging operation after patching is finished is avoided, the well repairing time is obviously shortened, and the recovery of production is accelerated.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a dissolvable expansion patching device comprises a connecting pipe, an expansion head, a bottom plug, a ball seat and a sealing ball;
the outer wall of the expansion pipe is provided with a sealing strip, the connecting pipe is positioned in the expansion pipe, the expansion head is arranged on the circumferential surface of the bottom of the connecting pipe, the diameter of the expansion head is larger than the inner diameter of the expansion pipe, the bottom of the expansion pipe is hermetically connected with a bottom plug, the center of the bottom plug is provided with an axial through hole, and the bottom plug is coaxially connected with a ball seat; a sealing ball is arranged on the ball seat; the bottom plug, the ball seat and the sealing ball are all made of water-soluble materials.
Preferably, the bottom of the expansion pipe extends radially inwards to form a pressure-bearing annular table; the top of the bottom plug extends radially outwards and is arranged at the top of the pressure-bearing annular table.
Preferably, a sealing ring is arranged between the expansion pipe and the bottom plug.
Preferably, the bottom plug, the ball seat and the sealing ball are all made of water-soluble metal.
Preferably, the expansion pipe extends out of the lower part of the bottom plug, and the ball seat is positioned at the bottom of the bottom plug.
Preferably, the expansion head is in threaded connection with the connecting pipe.
Preferably, the sealing bands are sleeved on the outer wall of the expansion pipe in a circle, and the sealing bands are multiple in number and are arranged along the radial direction of the expansion pipe.
A dissolvable inflatable patch method based on the device of any one of the above, comprising the steps of;
step one, extending the bottom of a connecting pipe into the bottom of an expansion pipe, hermetically connecting a bottom plug with the bottom of the expansion pipe, and connecting a ball seat with the bottom plug;
step two, placing the assembled device into a well until the expansion pipe extends into an area needing to be repaired in the well, and putting a sealing ball into the connecting pipe;
and step three, the connecting pipe is pulled upwards, the expansion head extrudes the expansion pipe to be attached to the well wall until the connecting pipe is pulled out to finish the patching, and the bottom plug, the ball seat and the sealing ball are dissolved by well fluid in the subsequent production process.
Preferably, the bottom of the expansion vessel is pre-expanded prior to step one.
Compared with the prior art, the invention has the following beneficial effects:
according to the device, the bottom plug, the ball seat and the sealing ball are made of water-soluble materials, so that the bottom plug, the ball seat and the sealing ball can be dissolved automatically in water after patching is finished on the premise of ensuring patching effect, fishing of the bottom plug after patching is avoided, a large number of working procedures are saved, well repairing time is remarkably shortened, and recovery production is accelerated.
Furthermore, the expansion head is connected with the connecting pipe in a threaded manner, so that the expansion heads with different sizes can be replaced conveniently, and the expansion pipe is suitable for expansion pipes with different sizes.
According to the method, the patching is carried out by only pulling out the connecting pipe from the bottom of the expansion pipe, so that the patching can be completed, the bottom plug, the ball seat and the sealing ball can be automatically dissolved by well liquid in the subsequent production process, the bottom plug salvaging operation after the patching is completed is avoided, a large number of working procedures are saved, the well repairing time is obviously shortened, and the production recovery is accelerated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a diagram illustrating the effect of the patch of the present invention after completion.
Wherein: 1-connecting pipe; 2-expansion pipe; 3-well wall; 4-an expansion head; 5-bottom blocking; 6-ball seat; 7-sealing ball.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in figure 1, the soluble expansion patching device comprises a connecting pipe 1, an expansion pipe 2, an expansion head 4, a bottom plug 5, a ball seat 6 and a sealing ball 7.
2 external diameters of expansion pipe are less than 3 internal diameters of the wall of a well, and 2 outer walls of expansion pipe are provided with the sealing strip for 2 outer walls of expansion pipe and 3 laminating anchorages of the wall of a well, sealing strip snare are on 2 outer walls of expansion pipe, and sealing strip quantity is a plurality of, and three sealing strip is a set of, and the multiunit sealing strip is along the radial setting of expansion pipe 2, guarantees that each position of 2 outer walls of expansion pipe can be inseparable with 3 laminating of the wall of a well.
The external diameter of connecting pipe 1 is less than expansion pipe 2 internal diameters, and expansion head 4 sets up on 1 bottom is global in the connecting pipe, and expansion head 4 diameter is greater than expansion pipe 2 internal diameters for with expansion pipe 2 along radial expansion, the expansion head 4 outside is circular, reduces to cause the damage to expansion pipe 2, expansion head 4 and 1 threaded connection of connecting pipe, conveniently change not unidimensional expansion head 4, thereby adapt to not unidimensional expansion pipe 2.
The bottom of the expansion pipe 2 is hermetically connected with a bottom plug 5, and a sealing ring, specifically an O-shaped rubber sealing ring, is arranged between the expansion pipe 2 and the bottom plug 5, so that the sealing effect is ensured. The bottom of the expansion pipe 2 extends inwards in the radial direction to form a pressure-bearing ring platform, the top of the bottom plug 5 extends outwards in the radial direction to form a step, and the bottom of the step is arranged at the top of the pressure-bearing ring platform, so that the pressure-bearing performance is guaranteed.
The expansion pipe 2 extends out of the lower part of the bottom plug 5, the ball seat 6 is in threaded sealing connection with the bottom of the bottom plug 5, the ball seat 6 is provided with a sealing ball 7, and the sealing ball 7 is a hollow ball; the center of the bottom plug 5 is provided with an axial through hole for the passing of a sealing ball 7.
The bottom plug 5, the ball seat 6 and the sealing ball 7 are all made of water-soluble materials, in particular water-soluble metals. The oil-water well liquid can be dissolved into liquid after meeting well liquid, and the normal production of oil and water wells is not influenced after the oil-water well liquid is dissolved.
When the device is used, firstly, components are installed, the bottom of the expansion pipe 2 is pre-expanded, the bottom of the connecting pipe 1 is extended into the bottom of the expansion pipe 2, the expansion head 4 is extended from the bottom of the expansion pipe 2 and is in threaded connection with the bottom of the connecting pipe 1, and the expansion head 4 is located in a pre-expansion area of the expansion pipe 2; the bottom plug 5 is hermetically connected with the bottom of the expansion pipe 2, and the ball seat 6 is in threaded connection with the bottom of the bottom plug 5.
And then placing the assembled device into a well, wherein the bottom of the expansion pipe 2 faces downwards until the expansion pipe 2 extends into an area needing to be repaired in the well, putting a sealing ball 7 into the connecting pipe 1, and positioning the sealing ball 7 on the ball seat 6 after penetrating through the connecting pipe 1 and the bottom plug 5.
The connecting pipe 1 is pulled upwards, the expansion head 4 extrudes the expansion pipe 2 to radially expand to be attached to the well wall 3 until the connecting pipe 1 is pulled out to finish subsiding, so that the expansion pipe 2 is anchored with the casing wall in a sealing manner, the subsiding pipe column and the expansion cone of the expansion pipe 2 are pulled out after the subsiding is finished, and well completion production can be continued after the subsiding operation is finished. The bottom plug 5, the ball seat 6 and the sealing ball 7 are dissolved by well fluid in the subsequent production process, and as shown in figure 2, the smoothness of patching a shaft is realized.
Before construction, all work needs to be completely prepared, stopping is strictly avoided in the construction process, and the like, liquid is forbidden to be left in a well, so that the problem of pressure bearing in the patching process and even underground accidents caused by the dissolution of the bottom plug 5, the ball seat 6 and the sealing ball 7 is avoided.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A soluble expansion patching device is characterized by comprising a connecting pipe (1), an expansion pipe (2), an expansion head (4), a bottom plug (5), a ball seat (6) and a sealing ball (7);
the outer wall of the expansion pipe (2) is provided with a sealing strip, the connecting pipe (1) is positioned in the expansion pipe (2), the expansion head (4) is arranged on the circumferential surface of the bottom of the connecting pipe (1), the diameter of the expansion head (4) is larger than the inner diameter of the expansion pipe (2), the bottom of the expansion pipe (2) is hermetically connected with a bottom plug (5), the center of the bottom plug (5) is provided with an axial through hole, and the bottom plug (5) is coaxially connected with a ball seat (6); a sealing ball (7) is arranged on the ball seat (6); the bottom plug (5), the ball seat (6) and the sealing ball (7) are all made of water-soluble materials.
2. A soluble expansion patch device according to claim 1, characterised in that the bottom of the expansion tube (2) extends radially inwards to form a pressure-bearing annular table; the top of the bottom plug (5) extends outwards in the radial direction and is arranged at the top of the pressure-bearing annular table.
3. A soluble expansion patching device as claimed in claim 1, characterised in that a sealing ring is arranged between the expansion pipe (2) and the bottom plug (5).
4. A soluble expandable patching device according to claim 1, characterized in that the bottom plug (5), the ball seat (6) and the sealing ball (7) are made of water-soluble metals.
5. A soluble expandable patching device in accordance with claim 1, characterized in that the expansion pipe (2) is extended below the bottom plug (5) and the ball seat (6) is located at the bottom of the bottom plug (5).
6. A soluble expandable patching device according to claim 1, characterized in that the expansion head (4) is screwed to the connection pipe (1).
7. A soluble expansion patching device according to claim 1, characterized in that the sealing band is looped on the outer wall of the expansion tube (2), the number of sealing bands being multiple and arranged radially along the expansion tube (2).
8. A dissolvable inflatable patch method based on a device according to any of claims 1-7, comprising the steps of;
firstly, the bottom of a connecting pipe (1) is extended into the bottom of an expansion pipe (2), a bottom plug (5) is hermetically connected with the bottom of the expansion pipe (2), and a ball seat (6) is connected with the bottom plug (5);
step two, placing the assembled device into a well until the expansion pipe (2) extends into an area needing to be repaired in the well, and putting a sealing ball (7) into the connecting pipe (1);
and step three, the connecting pipe (1) is pulled upwards, the expansion head (4) extrudes the expansion pipe (2) to be attached to the well wall (3) until the connecting pipe (1) is pulled out to finish the patching, and the bottom plug (5), the ball seat (6) and the sealing ball (7) are dissolved by well fluid in the subsequent production process.
9. A soluble expandable patch device method according to claim 8, characterised in that prior to step one, the bottom of the expansion tube (2) is pre-expanded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010366731.3A CN111456665A (en) | 2020-04-30 | 2020-04-30 | Soluble expansion patching device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010366731.3A CN111456665A (en) | 2020-04-30 | 2020-04-30 | Soluble expansion patching device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111456665A true CN111456665A (en) | 2020-07-28 |
Family
ID=71677836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010366731.3A Pending CN111456665A (en) | 2020-04-30 | 2020-04-30 | Soluble expansion patching device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111456665A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483033A (en) * | 2020-11-17 | 2021-03-12 | 中国石油天然气股份有限公司 | Non-metal pipe sleeve repairing structure and repairing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206319852U (en) * | 2016-11-17 | 2017-07-11 | 陈学虎 | A kind of bottom with pressure is blocked up |
| US20170241231A1 (en) * | 2015-12-22 | 2017-08-24 | Mohawk Energy Ltd. | Expandable Anchor Sleeve |
| CN109869108A (en) * | 2018-10-22 | 2019-06-11 | 中国石油集团渤海钻探工程有限公司 | A kind of broken well expandable casing patching device and its subsidy method |
| CN209483260U (en) * | 2018-11-27 | 2019-10-11 | 中国石油天然气股份有限公司 | A kind of expandable casing patching, which returns, to be inserted every adopting tool |
| CN210422553U (en) * | 2019-08-14 | 2020-04-28 | 崔海涛 | Soluble oil pipe plug for petroleum underground operation |
| CN111236880A (en) * | 2020-03-16 | 2020-06-05 | 北京中科金腾科技有限公司 | Method for compensating diameter of circular ring by corrugation, bridge plug and plugging device |
-
2020
- 2020-04-30 CN CN202010366731.3A patent/CN111456665A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170241231A1 (en) * | 2015-12-22 | 2017-08-24 | Mohawk Energy Ltd. | Expandable Anchor Sleeve |
| CN206319852U (en) * | 2016-11-17 | 2017-07-11 | 陈学虎 | A kind of bottom with pressure is blocked up |
| CN109869108A (en) * | 2018-10-22 | 2019-06-11 | 中国石油集团渤海钻探工程有限公司 | A kind of broken well expandable casing patching device and its subsidy method |
| CN209483260U (en) * | 2018-11-27 | 2019-10-11 | 中国石油天然气股份有限公司 | A kind of expandable casing patching, which returns, to be inserted every adopting tool |
| CN210422553U (en) * | 2019-08-14 | 2020-04-28 | 崔海涛 | Soluble oil pipe plug for petroleum underground operation |
| CN111236880A (en) * | 2020-03-16 | 2020-06-05 | 北京中科金腾科技有限公司 | Method for compensating diameter of circular ring by corrugation, bridge plug and plugging device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483033A (en) * | 2020-11-17 | 2021-03-12 | 中国石油天然气股份有限公司 | Non-metal pipe sleeve repairing structure and repairing method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20200728 |