CN109322639B - Screen pipe shearing ball seat for oil and gas well - Google Patents
Screen pipe shearing ball seat for oil and gas well Download PDFInfo
- Publication number
- CN109322639B CN109322639B CN201811497421.4A CN201811497421A CN109322639B CN 109322639 B CN109322639 B CN 109322639B CN 201811497421 A CN201811497421 A CN 201811497421A CN 109322639 B CN109322639 B CN 109322639B
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- CN
- China
- Prior art keywords
- seat
- shearing
- valve seat
- oil
- pipe
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- 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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- 238000010008 shearing Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 210000001503 joint Anatomy 0.000 claims abstract description 12
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Abstract
The invention discloses a screen pipe shearing ball seat for an oil and gas well, which comprises an upper joint, a screen pipe, a middle joint and a cylindrical pocket body which are sequentially connected through threads; the pipe hole of the upper joint is internally provided with a valve seat and a shearing seat for supporting the valve seat, the valve seat is provided with a steel ball sealed with the valve seat, the shearing seat is fixed on the upper joint through a shearing pin, a plurality of inclined holes which incline downwards are uniformly distributed on the sieve tube, and the lower part of the middle joint is provided with an elastic butterfly valve which can only be opened downwards. The invention has the following advantages: 1. the operation flow when the packer is set can be simplified, and the steel wire operation is avoided; 2. the oil gas flow channel after setting can be provided, and the underground oil gas flow condition is improved; 3. the risk of post-operation caused by falling objects at the bottom of the well can be prevented.
Description
Technical Field
The invention belongs to a matched device for well completion and well repair operation in the field of petroleum drilling and production, and particularly relates to a screen pipe shearing ball seat for an oil and gas well.
Background
In the oil and gas production industry, it is necessary to install a completion string in which important packer equipment is usually set by tubing pressurization, and to pressurize the tubing it is necessary to plug the lower tubing to enable pressurization. The common practice is to install a working cylinder at the lower part, to put a single flow valve into the working cylinder through a steel wire tool to realize the purpose of plugging the bottom of the oil pipe, and to salvage the single flow valve to leave an oil-gas channel after the packer is set. This method requires wire work and increases field effort.
Disclosure of Invention
The invention aims to provide a screen pipe shearing ball seat for an oil and gas well, which can simplify the operation flow of a setting packer and reduce the workload.
The technical scheme adopted for realizing the purpose of the invention is as follows:
The invention provides a screen pipe shearing ball seat for an oil and gas well, which comprises an upper joint, a screen pipe, a middle joint and a cylindrical pocket body which are sequentially connected through threads; the pipe hole of the upper joint is internally provided with a valve seat and a shearing seat for supporting the valve seat, the valve seat is provided with a steel ball sealed with the valve seat, the shearing seat is fixed on the upper joint through a shearing pin, a plurality of inclined holes which incline downwards are uniformly distributed on the sieve tube, and the lower part of the middle joint is provided with an elastic butterfly valve which can only be opened downwards.
And a vibration reduction gasket is arranged between the valve seat and the shearing seat.
The upper end and the lower end of the sieve tube are respectively provided with a stop screw, so that the screw threads for connecting the sieve tube with the upper joint and the middle joint are prevented from loosening.
The pocket body is drilled with small holes, and the lower part of the pocket body is provided with a conical bottom.
The beneficial effects of the invention are that
The invention is provided with the valve seat and the steel ball sealed with the valve seat, the bottom of the oil pipe can be plugged by a ball throwing method, the pressurizing and setting packer is realized, when the setting and the checking are completed, the ball seat is knocked off by adding higher pressure, the flow channel is opened, and sufficient flow area is provided to prevent the flow pressure resistance from being generated. Due to the elastic butterfly valve and the pocket body which are opened in one direction, the knocked-out ball seat assembly cannot fall into a well to prevent the recovery of lower equipment from being affected.
The invention has the following advantages:
1. the operation flow when the packer is set can be simplified, and the steel wire operation is avoided.
2. The oil gas circulation channel after setting can be provided, and the underground oil gas overflow condition is improved.
3. The risk of post-operation caused by falling objects at the bottom of the well can be prevented.
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic installation view of the present invention.
In the figure: upper joint 101, steel ball 102, valve seat 103, O-ring 104, vibration damping washer 105, shear pin 106, shear seat 107, set screw 108, screen 109, set screw 110, middle joint 111, butterfly valve torsion spring 112, rotation pin 113, butterfly valve 114, pocket 115, inclined hole 116, and small hole 117.
Detailed Description
Referring to fig. 1, the screen pipe shear ball seat 1 for oil and gas well provided by the invention comprises an upper joint 101, a screen pipe 109, a middle joint 111 and a pocket body 115 which are connected in sequence in a threaded manner; the upper joint 101 is used for being connected with an upper oil pipe through an oil pipe thread a, a valve seat 103 and a shearing seat 107 are arranged in a pipe hole of the upper joint 101, the valve seat 103 is sealed with the pipe hole of the upper joint 101 by an O-shaped ring 104, the valve seat 103 is supported and fixed by the lower shearing seat 107, a steel ball 102 sealed with the valve seat 103 is arranged on the valve seat 103, and the shearing seat 107 is fixed in the upper joint 101 through a plurality of shearing pins 106 arranged on the upper joint 101; a vibration damping washer 105 is arranged between the valve seat 103 and the shear seat 107, and is used for reducing the impact on the shear seat 107 when the steel ball 102 falls; the upper end of the screen pipe 109 is provided with a stop screw 108 for preventing the screw thread of the screen pipe 109 connected with the upper joint 101 from loosening; a plurality of groups of inclined holes 116 which incline downwards are uniformly distributed on the screen pipe 109 and are used for providing an entry channel of oil gas, the size and the quantity of the inclined holes 116 can be designed into different sizes according to actual conditions, and the inclined holes 116 incline downwards to facilitate sand discharge and anti-blocking; the lower end of the screen pipe 109 is provided with a stop screw 110 for preventing the screw thread of the screen pipe 109 connected with the middle joint 111 from loosening; the lower part of the middle joint 111 is provided with a butterfly valve 114 through a rotating pin 113, a butterfly valve torsion spring 112 is arranged outside the rotating pin 113 and used for providing the rotating torque of the butterfly valve 114, and the butterfly valve 114 has the function of realizing downward rotation opening and upward automatic closing; the purpose of the pocket body 115 is to hold the knocked-down steel ball 102, valve seat 103 and shear seat 107, preventing them from falling into the well, and once they fall into the pocket, the butterfly valve 114 automatically closes, preventing the fluid from carrying them out, the pocket body 115 is perforated with small holes 117 for maintaining pressure balance, and the lower portion of the pocket body 115 is provided with a tapered bottom for easy down-hole.
The working principle of the invention is as follows:
referring to fig. 2, the oil pipe 3 is an oil and gas passage, the casing 4 is a well bore of an oil and gas well, and the petroleum producing layer b is a destination layer for oil and gas production. The tubing 3 is housed in a casing 4, typically run to a depth of a few kilometres. The oil pipe 3 is connected with the packer 2 through threads, and the lower part of the packer 2 is connected with the screen pipe shearing ball seat 1 through threads. When the oil pipe is put into operation, the steel ball 102 is put on the ground for standby, after the oil pipe column is put into a preset depth, the steel ball 102 is put into the oil pipe 3 to block the inner hole of the valve seat 103 for sealing, and the bottom is blocked. At this point the surface is pressurized from the tubing 3 to the packer 2 setting pressure and the setting and testing is completed. Then higher hydraulic pressure (higher than setting pressure) is continuously added into the oil pipe 3, the shear pin 106 is sheared, the hydraulic pressure can beat the steel ball 102 and the valve seat 103 to open an oil pipe channel, the steel ball 102 and the valve seat 103 penetrate through the sieve tube 109, the butterfly valve 114 is crashed open and falls into the lower pocket body 115, and at the moment, the butterfly valve 114 is closed under the action of the torsion spring 112, so that the steel ball 102 and the valve seat 103 are prevented from upwards blocking the channel. The purpose of the ball 102 and valve seat 103 remaining in the pocket 115 is to prevent it from falling into the well. At this time, the oil and gas can flow into the oil pipe 3 through the plurality of inclined holes 116 on the screen pipe 109, so as to realize oil and gas production. The angled holes 116 in the screen 109 also prevent large pieces of downhole debris from entering the tubing 3 and blocking the flow path.
Claims (2)
1. A screen pipe shearing ball seat for an oil and gas well is characterized by comprising an upper joint, a screen pipe, a middle joint and a cylindrical pocket body which are sequentially connected through threads; a valve seat and a shearing seat for supporting the valve seat are arranged in a pipe hole of the upper joint, a steel ball sealed with the valve seat is arranged on the valve seat, the shearing seat is fixed on the upper joint through a shearing pin, a plurality of inclined holes which incline downwards are uniformly distributed on the sieve tube, and an elastic butterfly valve which can only be opened downwards is arranged at the lower part of the middle joint; a vibration damping washer is arranged between the valve seat and the shearing seat; the pocket body is drilled with small holes, and the lower part of the pocket body is provided with a conical bottom;
The oil pipe is connected with the packer through threads, and the lower part of the packer is connected with the screen pipe shearing ball seat through threads; when the oil pipe is put into operation, the steel ball is put on the ground for standby, after the oil pipe column is put to a preset depth, the steel ball is put into the oil pipe to block the inner hole of the valve seat for sealing, so that the bottom is blocked; at the moment, the ground is pressurized from the oil pipe to the setting pressure of the packer, and setting and checking are completed; then higher hydraulic pressure is continuously added into the oil pipe, and the shearing pin is sheared, so that the steel ball, the valve seat and the shearing seat penetrate through the sieve tube, the butterfly valve is crashed open and falls into the lower pocket body, the oil pipe channel is opened, and at the moment, the butterfly valve is closed under the action of the torsion spring, and the steel ball, the valve seat and the shearing seat are prevented from upwards blocking the channel.
2. The screen pipe shear ball seat for oil and gas well according to claim 1, wherein the upper and lower ends of the screen pipe are respectively provided with a stop screw to prevent loosening of threads of the screen pipe connected with the upper joint and the middle joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811497421.4A CN109322639B (en) | 2018-12-07 | Screen pipe shearing ball seat for oil and gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811497421.4A CN109322639B (en) | 2018-12-07 | Screen pipe shearing ball seat for oil and gas well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109322639A CN109322639A (en) | 2019-02-12 |
| CN109322639B true CN109322639B (en) | 2024-06-28 |
Family
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729296Y (en) * | 2004-07-16 | 2005-09-28 | 张晓东 | Well cementation float hoop, shoe of controlling butterfly valve by pressure bar system |
| CN201090177Y (en) * | 2007-09-25 | 2008-07-23 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Multifunctional check valve |
| RU2568615C1 (en) * | 2014-07-15 | 2015-11-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Reservoir cleaning and completion device |
| CN209179728U (en) * | 2018-12-07 | 2019-07-30 | 湖南唯科拓石油科技服务有限公司 | A kind of oil/gas well screen casing shearing ball seat |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729296Y (en) * | 2004-07-16 | 2005-09-28 | 张晓东 | Well cementation float hoop, shoe of controlling butterfly valve by pressure bar system |
| CN201090177Y (en) * | 2007-09-25 | 2008-07-23 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Multifunctional check valve |
| RU2568615C1 (en) * | 2014-07-15 | 2015-11-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Reservoir cleaning and completion device |
| CN209179728U (en) * | 2018-12-07 | 2019-07-30 | 湖南唯科拓石油科技服务有限公司 | A kind of oil/gas well screen casing shearing ball seat |
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