CN115478809B - Soluble ball seat device for cleaning well completion of liner tube - Google Patents
Soluble ball seat device for cleaning well completion of liner tube Download PDFInfo
- Publication number
- CN115478809B CN115478809B CN202110677423.7A CN202110677423A CN115478809B CN 115478809 B CN115478809 B CN 115478809B CN 202110677423 A CN202110677423 A CN 202110677423A CN 115478809 B CN115478809 B CN 115478809B
- Authority
- CN
- China
- Prior art keywords
- ball seat
- ball
- pressure
- soluble
- holding
- 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.)
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Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 239000002195 soluble material Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000011241 protective layer Substances 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 238000003801 milling Methods 0.000 abstract description 7
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005086 pumping Methods 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
-
- 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
Abstract
The invention provides a liner cleaning well completion soluble ball seat device, which comprises a shell; an inner sleeve arranged in the shell, wherein a ball seat is arranged in the inner sleeve; and the pressure-holding ball is clamped on the ball seat after being thrown into the pressure-holding ball, and the packer above the setting is continuously held so that the ball seat is separated from the inner sleeve and falls into the liner tube; wherein the ball seat and the pressure holding ball are made of soluble materials and are completely dissolved in a liquid environment in a well. The invention adopts soluble materials, can be completely dissolved, does not need milling, and meets the requirements of cleaning and well completion operation of the liner tube. The two-stage sealing surface is designed in the ball seat, so that the ball can be thrown twice, and the pressure holding reliability of the ball seat is improved.
Description
Technical Field
The invention relates to a liner tube cleaning well completion soluble ball seat device, and belongs to the technical field of petroleum well completion and production.
Background
In the well completion operation of the liner pipe, after the well completion pipe string is put into a preset position, a well mouth is required to throw balls, pumping balls are arranged on ball seats in the well completion pipe string, pressure is build up, an upper hydraulic packer is set, then the ball seats are continuously build up and hit down, and the ball seats fall into the liner pipe at the lower part.
Because the ball seat is insoluble, the problems of blocking a production channel and affecting normal production exist, and the ball seat is milled in the later stage, so that the problems of difficult milling, long milling time, high risk, high operation cost and the like exist. In addition, the problem of pressure holding failure caused by poor contact effect of the ball and the ball seat is solved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a soluble ball seat device for cleaning and completing a liner tube, which adopts soluble materials, can be completely dissolved, does not need milling, and meets the requirements of cleaning and completing the liner tube. The two-stage sealing surface is designed in the ball seat, so that the ball can be thrown twice, and the pressure holding reliability of the ball seat is improved.
The invention provides a liner cleaning well completion soluble ball seat device, which comprises:
a housing;
an inner sleeve arranged in the shell, wherein a ball seat is arranged in the inner sleeve; and
the ball is clamped on the ball seat after being put into the ball, and the packer above the ball seat is set, so that the ball seat is separated from the inner sleeve and falls into the liner tube;
wherein the ball seat and the pressure holding ball are made of soluble materials and are completely dissolved in a liquid environment in a well.
The invention is further improved in that the inner side of the inner sleeve is provided with a conical surface with larger upper end diameter and smaller lower end diameter; the lower part of the conical surface is provided with a primary sealing surface, and the upper part of the conical surface is provided with a secondary sealing surface;
the pressure-holding ball comprises a first pressure-holding ball matched with the primary sealing surface and a second pressure-holding ball matched with the secondary sealing surface.
According to the invention, the surface of the ball seat is coated with an insoluble protective layer, and the protective layer is damaged by stress when the pressure holding ball is connected with the ball seat.
The invention is further improved in that the primary sealing surface comprises a sealing cambered surface matched with the first pressure-holding ball, a protruding structure is arranged at the bottom of the sealing cambered surface, and a protective layer of the protruding structure is damaged when the protruding structure is subjected to collision stress of the first pressure-holding ball.
A further improvement of the present invention is that the tee uses soluble magnesium aluminum alloy or PGA as the soluble matrix material.
A further improvement of the invention is that the protective layer is a polytetrafluoroethylene coating.
The invention is further improved in that the ball seat is connected with the inner sleeve through a shear pin.
The invention is further improved in that a limiting step is arranged at the lower part of the inner wall of the shell, and the lower end of the inner sleeve is limited on the limiting step.
The invention further improves that the upper end of the outer shell is provided with an outer joint, and the upper end of the inner sleeve is limited at the lower end of the outer joint.
The invention further improves that the outer joint is connected with the outer cylinder through threads and is provided with a sealing ring.
Compared with the prior art, the invention has the advantages that:
the soluble ball seat device for cleaning and completing the liner tube adopts soluble materials, can be completely dissolved, does not need milling, and meets the requirements of cleaning and completing the liner tube. The ball seat adopts biodegradable materials such as soluble magnesium aluminum alloy or PGA and the like as a matrix material, and has the property of complete dissolution in the underground environment; the protection layer is integrally coated by the polytetrafluoroethylene coating, no leakage point exists, the protection layer can not be dissolved in advance, the two-stage sealing surface can be designed in the well before the ball seat operation, the ball can be thrown twice, and the pressure holding reliability of the ball seat is improved.
The liner tube cleaning well completion soluble ball seat device has the advantages that the double sealing surfaces on the inner surface of the ball seat are designed, the ball is allowed to be thrown twice, and reliable pressure holding is ensured. When the first pressure-building ball is thrown in the early stage and normal pressure building cannot be performed, the second pressure-building ball with the large diameter can be thrown, the pressure building is performed again, the reliability of the ball seat is further improved, normal pressure building is guaranteed, and the packer is set.
The sealing surface is specially designed, the sealing cambered surface is matched with the pressure-holding ball to realize high-pressure-bearing sealing, the convex structure at the bottom of the sealing cambered surface is contacted with the pressure-holding ball, the coating is destroyed due to stress concentration under the action of pressure bearing, and after the ball seat is sheared off, liquid is contacted with a base material through the broken part of the coating to start dissolving until the ball seat is completely dissolved. And the milling is not needed, and the cleaning and well completion operation requirement of the liner tube is met.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of a liner cleaning completion soluble ball seat apparatus according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a liner cleaning completion soluble ball seat apparatus according to one embodiment of the invention, shown after pitching;
FIG. 3 is a schematic view of the primary seal face structure of an embodiment of the present invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
The meaning of the reference numerals in the drawings is as follows: 1. the device comprises a shell, 2, an inner sleeve, 3, a ball seat, 11, an outer joint, 12, a limit step, 13, a sealing ring, 21, a shear pin, 31, a primary sealing surface, 32, a secondary sealing surface, 33, a sealing cambered surface, 34, a protruding structure, 41, a first pressure-holding ball, 42 and a second pressure-holding ball.
Detailed Description
In order to make the technical solution and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present invention and are not exhaustive of all embodiments. And embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Fig. 1 schematically illustrates a liner cleaning completion soluble ball seat apparatus according to one embodiment of the invention, comprising a housing 1, said housing 1 being of cylindrical configuration, connected below a packer. An inner sleeve 2 is arranged in the shell 1, the inner sleeve 2 is of a cylindrical structure, and the outer diameter of the inner sleeve 2 is matched with the inner diameter of the shell 1. The inner sleeve 2 is internally provided with a ball seat 3, the ball seat 3 is fixed in the inner sleeve 2 in an initial state, and the ball seat 3 is separated from the inner sleeve 2 after the packer above is set. The device matched with the ball seat 3 is a pressure-holding ball, and after the wellhead inputs the pressure-holding ball, the pressure-holding ball falls to the position of the ball seat 3 and is clamped on the ball seat 3 to carry out pressure holding, so that the packer above the pressure-holding ball is set; and then the ball seat 3 is separated from the inner sleeve 2 by continuing to hold pressure, and falls into the liner tube. In this embodiment, the ball seat 3 and the hold-down ball are of a soluble material that is completely dissolved in the liquid environment in the well.
According to the liner tube cleaning well completion soluble ball seat device, the ball seat 3 and the pressure holding ball are made of soluble materials, so that the liner tube cleaning well completion soluble ball seat device can be completely dissolved without milling, and the liner tube cleaning well completion operation requirement is met.
In one embodiment, as shown in fig. 2, the inner side of the inner sleeve 2 is provided with a conical surface with a larger diameter at the upper end and a smaller diameter at the lower end; the lower part of the conical surface is provided with a primary sealing surface 31, and the upper part is provided with a secondary sealing surface 32. The pressure-holding balls comprise a first pressure-holding ball 41 matched with the primary sealing surface 31 and a second pressure-holding ball 42 matched with the secondary sealing surface 32. The diameter of the second pressure-holding ball 42 is larger than the diameter of the first pressure-holding ball 41.
The primary sealing surface 31 and the secondary sealing surface 32 are arc surfaces which are arranged in a circumferential direction, and the arc surfaces are matched with the radian of the spherical surface of the pressure-holding ball. The first pressure-holding ball 41 is clamped on the first-stage sealing surface 31 to hold pressure above, when the pressure cannot be normally held, the second pressure-holding ball 42 with a large diameter can be put into engagement with the second-stage sealing surface 32 to hold pressure again, so that the reliability of the ball seat 3 is improved, normal pressure holding is ensured, and the packer is set.
In one embodiment, the surface of the ball seat 3 is coated with an insoluble protective layer, and the protective layer is broken by stress generated by collision when the holding ball is connected with the ball seat 3, so that soluble materials in the protective layer are exposed. By providing a protective layer, premature dissolution of the soluble material in contact with the fluid in the well is prevented.
In a preferred embodiment, as shown in fig. 3, the primary sealing surface 31 includes a sealing arc surface 33 that is matched with the first pressure-holding ball 41, and the arc of the sealing arc surface 33 is the same as the arc of the first pressure-holding ball 41. A protruding structure 34 is arranged at the bottom of the sealing cambered surface 33, and the protruding structure 34 is an annular upwards protruding structure with annular sharp corners. The protection layer of the bump structure 34 is broken when the bump stress of the first pressure-holding ball 41 is applied.
In the liner cleaning completion soluble ball seat device according to the present embodiment, by providing the protrusion structure 34, a larger stress can be generated when the holding ball collides with the ball seat 3, and the protection layer is fragile at the position of the protrusion structure 34 with sharp corners, so that the protection layer is easily damaged. After the protective layer is broken, the soluble material is exposed to corrosion or dissolution.
Preferably, the ball seat 3 adopts soluble magnesium aluminum alloy or PGA as a soluble matrix material, and the protection layer adopts polytetrafluoroethylene coating. Through setting up polytetrafluoroethylene coated protective layer, make the protective layer not have the leak point, can not dissolve in advance, can effectively protect ball seat 3 operation before keeping intact in the pit.
In one embodiment, as shown in fig. 1 and 2, the ball seat 3 and the inner sleeve 2 are connected by a shear pin 21. The shear pin 21 will shear more than the force at which the packer is set. When the pressure-holding ball is clamped on the ball seat 3, the pressure above the pressure-holding ball is increased through pressure holding, and when the pressure is increased to a certain value, the packer is set; the pressurization continues, after which the shear pin 21 is sheared under pressure. At this time, the ball seat 3 and the inner sleeve 2 are separated, and the ball seat 3 and the holding ball are pushed to move downwards into the liner tube under the action of pressure, and are gradually dissolved.
In one embodiment, a limiting step 12 is provided at the lower part of the inner wall of the housing 1. The limiting step 12 is circumferentially arranged on the inner wall of the housing 1, and the inner diameter of the part above the limiting step 12 is larger, and the inner diameter of the part below the limiting step 12 is smaller. The lower end of the inner sleeve 2 is limited on the limiting step 12. In a preferred embodiment, the width of the limit step 12 matches the thickness of the inner sleeve 2, smoothing the inner wall thereof.
In one embodiment, the upper end of the outer shell 1 is provided with an outer joint 11, and the upper end of the inner sleeve 2 is limited to the lower end of the outer joint 11. Preferably, the outer joint 11 is connected with the outer cylinder through threads, and a sealing ring 13 is arranged.
In the invention, the upper part is the direction close to the wellhead, and the lower part is the direction far from the wellhead.
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. A liner cleaning completion soluble ball seat apparatus, comprising:
a housing (1);
an inner sleeve (2) arranged in the shell (1), wherein a ball seat (3) is arranged in the inner sleeve (2); the inner side of the inner sleeve (2) is provided with a conical surface with a larger upper end diameter and a smaller lower end diameter; the lower part of the conical surface is provided with a primary sealing surface (31), and the upper part of the conical surface is provided with a secondary sealing surface (32); and
the ball is put into the pressure-holding ball and then clamped on the ball seat (3), a packer above the ball seat is set, and the pressure-holding is continued to enable the ball seat (3) to be separated from the inner sleeve (2) and fall into the liner tube; the pressure-holding ball comprises a first pressure-holding ball (41) matched with the primary sealing surface (31) and a second pressure-holding ball (42) matched with the secondary sealing surface (32);
wherein the ball seat (3) and the pressure-holding ball are made of soluble materials and are completely dissolved in a liquid environment in a well; the surface of the ball seat (3) is coated with an insoluble protective layer, and the protective layer is damaged by stress when the pressure-holding ball is connected with the ball seat (3);
the primary sealing surface (31) comprises a sealing cambered surface (33) matched with the first pressure-holding ball (41), a protruding structure (34) is arranged at the bottom of the sealing cambered surface (33), and the protection layer of the protruding structure (34) is damaged when the protruding structure (34) is subjected to collision stress of the first pressure-holding ball (41).
2. A liner cleaning completion soluble ball seat apparatus according to claim 1, wherein the ball seat (3) uses soluble magnesium aluminium alloy or PGA as a soluble matrix material.
3. The liner cleaning completion soluble ball seat apparatus of claim 2 wherein the protective layer is a polytetrafluoroethylene coating.
4. A liner cleaning completion soluble ball seat apparatus according to any one of claims 1 to 3, wherein the ball seat (3) and the inner sleeve (2) are connected by shear pins (21).
5. The liner cleaning completion soluble ball seat apparatus of claim 4 wherein a lower portion of the inner wall of the outer housing (1) is provided with a stop step (12), the lower end of the inner housing (2) being constrained to the stop step (12).
6. The liner cleaning completion soluble ball seat apparatus of claim 5 wherein an upper end of the outer housing (1) is provided with an outer joint (11) and an upper end of the inner housing (2) is restrained at a lower end of the outer joint (11).
7. A liner cleaning completion soluble ball seat apparatus according to claim 6, wherein the outer joint (11) is threadably connected to the housing and is provided with a sealing ring (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110677423.7A CN115478809B (en) | 2021-06-16 | 2021-06-16 | Soluble ball seat device for cleaning well completion of liner tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110677423.7A CN115478809B (en) | 2021-06-16 | 2021-06-16 | Soluble ball seat device for cleaning well completion of liner tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115478809A CN115478809A (en) | 2022-12-16 |
| CN115478809B true CN115478809B (en) | 2024-04-02 |
Family
ID=84420068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110677423.7A Active CN115478809B (en) | 2021-06-16 | 2021-06-16 | Soluble ball seat device for cleaning well completion of liner tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115478809B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453778A (en) * | 2014-11-06 | 2015-03-25 | 中国石油天然气股份有限公司 | Fracture sliding sleeve with dissoluble ball seat and fracturing method |
| WO2015069398A1 (en) * | 2013-11-11 | 2015-05-14 | Baker Hughes Incorporated | Degradable packing element |
| CN208885243U (en) * | 2018-09-30 | 2019-05-21 | 天津市玛特瑞科技有限公司 | A kind of ball seat and fracturing sliding bush for fracturing sliding bush |
| CN110735610A (en) * | 2019-11-12 | 2020-01-31 | 四机赛瓦石油钻采设备有限公司 | soluble pressing plug |
| CN111946270A (en) * | 2020-08-10 | 2020-11-17 | 成都英诺思科技有限公司 | Casing pipe nipple |
| CN112145127A (en) * | 2020-10-26 | 2020-12-29 | 安东石油技术（集团）有限公司 | Soluble ball seat and pitching sliding sleeve |
-
2021
- 2021-06-16 CN CN202110677423.7A patent/CN115478809B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015069398A1 (en) * | 2013-11-11 | 2015-05-14 | Baker Hughes Incorporated | Degradable packing element |
| CN104453778A (en) * | 2014-11-06 | 2015-03-25 | 中国石油天然气股份有限公司 | Fracture sliding sleeve with dissoluble ball seat and fracturing method |
| CN208885243U (en) * | 2018-09-30 | 2019-05-21 | 天津市玛特瑞科技有限公司 | A kind of ball seat and fracturing sliding bush for fracturing sliding bush |
| CN110735610A (en) * | 2019-11-12 | 2020-01-31 | 四机赛瓦石油钻采设备有限公司 | soluble pressing plug |
| CN111946270A (en) * | 2020-08-10 | 2020-11-17 | 成都英诺思科技有限公司 | Casing pipe nipple |
| CN112145127A (en) * | 2020-10-26 | 2020-12-29 | 安东石油技术（集团）有限公司 | Soluble ball seat and pitching sliding sleeve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115478809A (en) | 2022-12-16 |
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