CN115573684B - Device for automatically closing overcurrent at fixed time and using method thereof - Google Patents
Device for automatically closing overcurrent at fixed time and using method thereof Download PDFInfo
- Publication number
- CN115573684B CN115573684B CN202211449480.0A CN202211449480A CN115573684B CN 115573684 B CN115573684 B CN 115573684B CN 202211449480 A CN202211449480 A CN 202211449480A CN 115573684 B CN115573684 B CN 115573684B
- Authority
- CN
- China
- Prior art keywords
- communicating
- soluble metal
- hole
- metal body
- overflowing
- 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
Images
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
- E21B34/063—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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a timing automatic closing over-current device and a use method thereof, relating to the technical field of oil field underground seal inspection equipment, comprising a main body and an automatic valve, wherein a long hole for installing the automatic valve is axially arranged in the pipe wall of the main body, a spring, a sliding valve and a soluble metal body of the automatic valve are sequentially arranged in the long hole, a stop block is arranged at one end of the long hole and used for pressing the spring, a lock cap is arranged at the other end of the long hole and used for supporting the soluble metal body, and the lock cap is provided with a through hole; the pipe wall of the main body is provided with a first communicating hole for communicating the inner cavity of the main body with the long hole and a second communicating hole for communicating the long hole with the outside of the main body, the slide valve is a columnar body, and a communicating cavity is arranged in the slide valve; before the soluble metal body is dissolved, the first communicating hole, the communicating cavity and the second communicating hole are communicated to form a flow passage; after the soluble metal body is dissolved, the slide valve moves, and the overflowing channel is disconnected; the device has simple structure, can be used for multi-stage seal inspection, and has simple operation steps.
Description
Technical Field
The invention relates to the technical field of oil field underground seal inspection equipment, in particular to a timed automatic closing over-current device and a using method thereof.
Background
The packer is an important downhole tool in the development process of oil and gas fields, is used for sealing and isolating oil, gas and water layers in a casing, and realizes the functions of separate mining, separate water injection, separate layer testing and the like. The hydraulic packer is a packer which is used for packing a pipe column by pressing on a well head, but the seal inspection after the existing hydraulic packer is set is a difficult problem.
Chinese patent CN102507096B discloses a packer seal checking method and a seal checking device used in the method, the seal checking device comprises a hollow tube body, an inner hole communicated with a tube cavity of a corresponding oil tube is arranged in the hollow tube body, a storage cavity for storing a seal checking reagent is arranged on the periphery of the hollow tube body, a reagent outflow channel for the seal checking reagent to flow into a sealing space formed by a packer to be checked is arranged on the cavity wall of the storage cavity, and the seal checking device further comprises a switch mechanism for controlling the on-off of the reagent outflow channel; when the seal inspection device is used for multi-stage seal inspection, an operator needs to sample and detect for multiple times, the operation steps are excessively complicated, and the labor cost is high.
Disclosure of Invention
The invention aims to provide a timing automatic closing overcurrent device and a using method thereof, aiming at the defect that the operation steps of the existing seal checking device are too complicated.
The technical scheme of the invention is as follows: a timing automatic closing overflowing device is arranged between every two stages of packers and comprises a main body and an automatic valve, wherein a long hole for installing the automatic valve is formed in the pipe wall of the main body along the axial direction, the automatic valve comprises a slide valve, a spring, a stop block, a soluble metal body and a lock cap, the spring, the slide valve and the soluble metal body are sequentially arranged in the long hole, the stop block is arranged at one end of the long hole and used for pressing the spring, the lock cap is arranged at the other end of the long hole and used for supporting the soluble metal body, and a through hole is formed in the lock cap;
the pipe wall of the main body is provided with a first communicating hole for communicating the inner cavity of the main body with the long hole and a second communicating hole for communicating the long hole with the outside of the main body, the slide valve is a columnar body, and a communicating cavity is arranged in the slide valve; before the soluble metal body is dissolved, the first communicating hole, the communicating cavity and the second communicating hole are communicated to form a overflowing channel; after the soluble metal body is dissolved, the slide valve moves, and the overflowing channel is disconnected.
Preferably, the soluble metal body is a soluble aluminum alloy.
Preferably, the spring is a rectangular spring.
Preferably, the first communicating hole and the second communicating hole are arranged in a vertically staggered manner.
Preferably, two stages of sealing rings are arranged on the slide valve, the two stages of sealing rings are respectively positioned at the upper side and the lower side of the communicating cavity, and the first communicating hole and the second communicating hole are positioned between the two stages of sealing rings before the soluble metal body is dissolved; after the soluble metal body is dissolved, the primary sealing ring is positioned between the first communicating hole and the second communicating hole.
A use method of a timing automatic closing overcurrent device comprises the following steps:
1) The timing automatic closing overflowing device is connected with a packer and then is put into a well;
2) After the pipe column is lowered to a preset position, starting an underground water suction pump to enable an underground packer to be set and inject water;
3) The timing automatic closing overflowing device completes the fusion and dissolution of a soluble metal body and a liquid medium according to the designed delay time requirement, a spring pushes a slide valve to move, the slide valve reaches a preset position, an overflowing channel is disconnected, and the delay closing of the timing automatic closing overflowing device after a packer is set is completed;
4) Observing the change of the load of the water suction pump caused by the change of the water injection pressure before and after the timing automatic closing overflowing device is closed, and if the load of the water suction pump is increased, indicating that the packer completes setting; if the load of the water suction pump is not changed, the packer is indicated to be not set;
5) When a plurality of timing automatic closing overflowing devices are arranged on the tubular column, the timing closing time of the devices is different by arranging different soluble metal bodies; and repeating the steps 3) -4) and carrying out gradual seal inspection.
Compared with the prior art, the invention has the following advantages:
after the tubular column goes into the well and the packer is set, the timing automatic-closing overflowing device realizes the automatic closing of the valve by depending on the structure of the timing automatic-closing overflowing device, the closing time can be designed according to the requirement, and the setting verification of the hydraulic packer can be realized, and the requirement of normal underground production operation can be met; the device has simple structure, can be used for multi-stage seal inspection, and has simple operation steps.
Drawings
FIG. 1 is a schematic diagram of the on-state of a timed automatic shutdown over-current apparatus;
fig. 2 is a schematic view of the closing state of the timed automatic closing overcurrent device.
In the figure: 1. the valve comprises a main body 101, a first communication hole 102, a second communication hole 2, a spring 3, a slide valve 301, a communication cavity 4, a soluble metal body 5, a stop block 6, a lock cap 7 and a sealing ring.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
Example one
Referring to fig. 1-2, the timed automatic closing overflowing device is arranged between every two stages of packers, and comprises a main body 1 and an automatic valve, wherein a long hole for installing the automatic valve is formed in the pipe wall of the main body 1 along the axial direction, the automatic valve comprises a slide valve 3, a spring 2, a stop block 5, a soluble metal body 4 and a lock cap 6, the spring 2, the slide valve 3 and the soluble metal body 4 are sequentially arranged in the long hole, the stop block 5 is arranged at one end of the long hole and used for pressing the spring 2, the lock cap 6 is arranged at the other end of the long hole and used for supporting the soluble metal body 4, and a through hole is formed in the lock cap 6;
the pipe wall of the main body 1 is provided with a first communicating hole 101 for communicating the inner cavity of the main body 1 and the long hole and a second communicating hole 102 for communicating the long hole and the outside of the main body 1, the slide valve 3 is a columnar body, and the inside of the slide valve is provided with a communicating cavity 301; before the soluble metal body 4 is dissolved, the first communicating hole 101, the communicating cavity 301 and the second communicating hole 102 are communicated to form a overflowing channel; after the soluble metal body 4 is dissolved, the slide valve 3 moves and the flow passage is opened.
In more detail, the spring 2 is a rectangular spring.
The timing automatic closing overcurrent device is used for sealing inspection and comprises the following steps:
1) The timing automatic closing overflowing device is connected with a packer and then is put into a well;
2) After the pipe column is lowered to a preset position, starting an underground water pump to seat an underground packer and inject water;
3) According to the timing automatic closing overflowing device, the soluble metal body 4 and the liquid medium are fused and dissolved completely according to the designed delay time requirement, the spring 2 pushes the slide valve 3 to move, the slide valve 3 reaches a preset position, and the overflowing channel is disconnected, so that the delay closing of the timing automatic closing overflowing device after the packer is set is completed;
4) Observing the change of the load of the water suction pump caused by the change of the water injection pressure before and after the timing automatic closing overflowing device is closed, and if the load of the water suction pump is increased, indicating that the packer completes setting; if the load of the water pump is not changed, the packer is indicated to be not set;
5) When a plurality of timing automatic closing overflowing devices are arranged on the tubular column, the timing closing time of the timing automatic closing overflowing devices is different by arranging different soluble metal bodies 4; and repeating the steps 3) -4) and carrying out gradual seal inspection.
After the tubular column goes into the well and the packer is set, the timing automatic-closing overflowing device realizes the automatic closing of the valve by depending on the structure of the timing automatic-closing overflowing device, the closing time can be designed according to the requirement, and the setting verification of the hydraulic packer can be realized, and the requirement of normal underground production operation can be met; the device has simple structure, can be used for multi-stage seal inspection, and has simple operation steps.
Example two
The lower well string of this embodiment is equipped with three packer and two timing self-closing overflow devices that correspond, and three packer from the top down is one-level packer, second grade packer and tertiary packer in proper order, and two timing self-closing overflow devices from the top down are first overflow device and second overflow device in proper order, and the timing off-time of first overflow device is 12 hours, and the timing off-time of second overflow device is 24 hours.
Running the tubular string of the present embodiment into the well; after the pipe column is lowered to a preset position, starting an underground water suction pump to enable an underground packer to be set and inject water; after 12 hours, the first overflowing device is closed, at the moment, if the load of the water suction pump is increased, it is indicated that the first-stage packer and the second-stage packer are both completely set, and if the load of the water suction pump is unchanged, it is indicated that the first-stage packer and the second-stage packer have unfinished setting; and after 24 hours, the second overflowing device is closed, at the moment, if the load of the water suction pump is increased, the second-stage packer and the third-stage packer are both completely set, and if the load of the water suction pump is not changed, the second overflowing device and the third-stage packer are not completely set.
EXAMPLE III
As a preferred embodiment of the present invention, in this embodiment, a material of the soluble metal body 4 is selected on the basis of the first embodiment, specifically:
in this embodiment, the soluble metal body 4 is made of a soluble aluminum alloy, and the soluble aluminum alloy can be fused and dissolved with the downhole fluid according to the design time requirement.
Example four
As a preferred embodiment of the present invention, in this embodiment, on the basis of the first embodiment, the first communication hole 101 and the second communication hole 102 are optimally arranged, specifically:
in this embodiment, the first communicating hole 101 and the second communicating hole 102 are arranged in a vertically offset manner.
In addition, two stages of sealing rings 7 are arranged on the slide valve 3, the two stages of sealing rings 7 are respectively positioned at the upper side and the lower side of the communicating cavity 301, and the first communicating hole 101 and the second communicating hole 102 are positioned between the two stages of sealing rings 7 before the soluble metal body 4 is dissolved; after the soluble metal body 4 is dissolved, the primary seal ring 7 is located between the first communication hole 101 and the second communication hole 102.
After the timing automatic closing overflowing device is closed, the sealing ring 7 positioned between the first communication hole 101 and the second communication hole 102 can improve the sealing performance of the closed slide valve 3.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.
Claims (5)
1. The use method of the device for automatically closing the overflowing at regular time is characterized in that the device is arranged between every two stages of packers, comprises a main body and is characterized in that: the automatic valve comprises a main body and is characterized by further comprising an automatic valve, wherein a long hole for installing the automatic valve is formed in the pipe wall of the main body in the axial direction, the automatic valve comprises a slide valve, a spring, a stop block, a soluble metal body and a lock cap, the spring, the slide valve and the soluble metal body are sequentially arranged in the long hole, the stop block is installed at one end of the long hole and used for pressing the spring, the lock cap is installed at the other end of the long hole and used for supporting the soluble metal body, and a through hole is formed in the lock cap;
the pipe wall of the main body is provided with a first communicating hole for communicating the inner cavity of the main body with the long hole and a second communicating hole for communicating the long hole with the outside of the main body, the slide valve is a columnar body, and a communicating cavity is arranged in the slide valve; before the soluble metal body is dissolved, the first communicating hole, the communicating cavity and the second communicating hole are communicated to form a flow passage; after the soluble metal body is dissolved, the slide valve moves, and the overflowing channel is disconnected;
the using method of the device comprises the following steps:
1) The timing automatic closing overflowing device is connected with a packer and then is put into a well;
2) After the pipe column is lowered to a preset position, starting an underground water pump to seat an underground packer and inject water;
3) The timing automatic closing overflowing device completes the fusion and dissolution of a soluble metal body and a liquid medium according to the designed delay time requirement, a spring pushes a slide valve to move, the slide valve reaches a preset position, an overflowing channel is disconnected, and the delay closing of the timing automatic closing overflowing device after a packer is set is completed;
4) Observing the change of the load of the water suction pump caused by the change of the water injection pressure before and after the timing automatic closing overflowing device is closed, and if the load of the water suction pump is increased, indicating that the packer completes setting; if the load of the water pump is not changed, the packer is indicated to be not set;
5) When a plurality of timing automatic closing overflowing devices are arranged on the tubular column, the timing closing time of the timing automatic closing overflowing devices is different by arranging different soluble metal bodies; and repeating the steps 3) -4), and performing gradual seal checking.
2. The use method of the timed automatic shutdown overcurrent device according to claim 1, is characterized in that: the soluble metal body is made of soluble aluminum alloy.
3. The use method of the timed automatic shutdown overcurrent device of claim 1, characterized by: the spring is a rectangular spring.
4. The use method of the timed automatic shutdown overcurrent device according to claim 1, is characterized in that: the first communicating hole and the second communicating hole are arranged in a vertically staggered mode.
5. The use method of the timed automatic shutdown overcurrent device according to claim 4, is characterized in that: the slide valve is provided with two stages of sealing rings which are respectively positioned at the upper side and the lower side of the communicating cavity, and the first communicating hole and the second communicating hole are positioned between the two stages of sealing rings before the soluble metal body is dissolved; after the soluble metal body is dissolved, the primary sealing ring is positioned between the first communicating hole and the second communicating hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211449480.0A CN115573684B (en) | 2022-11-18 | 2022-11-18 | Device for automatically closing overcurrent at fixed time and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211449480.0A CN115573684B (en) | 2022-11-18 | 2022-11-18 | Device for automatically closing overcurrent at fixed time and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115573684A CN115573684A (en) | 2023-01-06 |
| CN115573684B true CN115573684B (en) | 2023-04-07 |
Family
ID=84588752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211449480.0A Active CN115573684B (en) | 2022-11-18 | 2022-11-18 | Device for automatically closing overcurrent at fixed time and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115573684B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115773086A (en) * | 2023-02-10 | 2023-03-10 | 山东圣颐石油技术开发有限公司 | Upper lifting type tension setting co-well injection and production system pipe column |
| CN115822508A (en) * | 2023-02-10 | 2023-03-21 | 山东圣颐石油技术开发有限公司 | Multi-stage hydraulic setting co-well injection and production system pipe column |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU95737U1 (en) * | 2010-01-11 | 2010-07-10 | Общество с ограниченной ответственностью "СИНЕРГИЯ-ЛИДЕР" | CHECK VALVE |
| CN104110256A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | High-temperature identifying agent sealing examination device |
| CN104563998A (en) * | 2014-09-04 | 2015-04-29 | 杰瑞能源服务有限公司 | Multistage fracturing tool pipe column of continuous oil pipe and construction method |
| CN107504189A (en) * | 2017-08-28 | 2017-12-22 | 浙江工业大学 | A kind of liquid machine sealing device suitable for transformation environment |
| CN108060906A (en) * | 2017-11-22 | 2018-05-22 | 王袁媛 | A kind of un-throttled fracturing packer of high-pressure oil-gas well |
| CN109162670A (en) * | 2018-10-13 | 2019-01-08 | 中石化石油工程技术服务有限公司 | Soluble E type seating and sealing unit and its set method |
| CN211008553U (en) * | 2019-04-22 | 2020-07-14 | 北京金科龙石油技术开发有限公司 | Timing automatic deblocking mechanism |
| CN211058779U (en) * | 2019-12-18 | 2020-07-21 | 新疆恒智伟业石油工程技术开发有限公司 | Soluble temporary plugging slotted screen pipe |
| CN216588536U (en) * | 2021-12-16 | 2022-05-24 | 中国石油化工股份有限公司 | Oil well packer |
| CN217462100U (en) * | 2022-05-23 | 2022-09-20 | 阜新市石油工具厂 | Packer capable of being taken out and drilled |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2711683C (en) * | 2008-01-11 | 2016-03-15 | Schlumberger Canada Limited | Zonal testing with the use of coiled tubing |
| GB2573964B (en) * | 2017-06-07 | 2021-12-01 | Halliburton Energy Services Inc | Downhole interventionless tools, systems, and methods for setting packers |
-
2022
- 2022-11-18 CN CN202211449480.0A patent/CN115573684B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU95737U1 (en) * | 2010-01-11 | 2010-07-10 | Общество с ограниченной ответственностью "СИНЕРГИЯ-ЛИДЕР" | CHECK VALVE |
| CN104110256A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | High-temperature identifying agent sealing examination device |
| CN104563998A (en) * | 2014-09-04 | 2015-04-29 | 杰瑞能源服务有限公司 | Multistage fracturing tool pipe column of continuous oil pipe and construction method |
| CN107504189A (en) * | 2017-08-28 | 2017-12-22 | 浙江工业大学 | A kind of liquid machine sealing device suitable for transformation environment |
| CN108060906A (en) * | 2017-11-22 | 2018-05-22 | 王袁媛 | A kind of un-throttled fracturing packer of high-pressure oil-gas well |
| CN109162670A (en) * | 2018-10-13 | 2019-01-08 | 中石化石油工程技术服务有限公司 | Soluble E type seating and sealing unit and its set method |
| CN211008553U (en) * | 2019-04-22 | 2020-07-14 | 北京金科龙石油技术开发有限公司 | Timing automatic deblocking mechanism |
| CN211058779U (en) * | 2019-12-18 | 2020-07-21 | 新疆恒智伟业石油工程技术开发有限公司 | Soluble temporary plugging slotted screen pipe |
| CN216588536U (en) * | 2021-12-16 | 2022-05-24 | 中国石油化工股份有限公司 | Oil well packer |
| CN217462100U (en) * | 2022-05-23 | 2022-09-20 | 阜新市石油工具厂 | Packer capable of being taken out and drilled |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115573684A (en) | 2023-01-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115573684B (en) | Device for automatically closing overcurrent at fixed time and using method thereof | |
| US2742968A (en) | Self-inflating balloon type formation tester | |
| CN1936269B (en) | Three-layer water-searching pipe column for oil-pumping well in oil field and water-searching method | |
| US7562713B2 (en) | Downhole actuation tools | |
| CN103953331A (en) | Self-drilling type in-situ measuring device of coal seam gas pressure | |
| CN107701147A (en) | A kind of annular pressure downhole control valve | |
| CN104121013A (en) | Water exploration device for horizontal well and method for determining water outlet position through water exploration device | |
| US20220243557A1 (en) | Wet-Mate Retrievable Filter System | |
| US4624317A (en) | Well tool with improved valve support structure | |
| CN204804754U (en) | Eccentric seperated layer water injection packer | |
| CN112012688B (en) | Relay seat-sealing type packer and method | |
| CN203239310U (en) | Unlimited-section fracture casing pipe sliding sleeve | |
| CN102507096A (en) | Seal examining method of packer and seal examining device used in method | |
| CN108999590B (en) | Profile control tool, separate injection profile control integrated pipe column and process | |
| CN104213867B (en) | A kind of multi-functional Water well packer | |
| CN114508326B (en) | Sand control well completion integration packing and filling instrument | |
| RU128896U1 (en) | DEVICE FOR TRANSFER OF WELLS, INCLUDING WATERFILLED, TO OPERATION ON TWO LIFT COLUMNS | |
| CN111827983B (en) | Water finding method and device for cased well completion horizontal well | |
| CN110206509B (en) | Water level differential pressure control valve | |
| CN212054603U (en) | Self-sealing leather cup packer | |
| CN108397185B (en) | Quick test tube post of cable layering | |
| CN107780872B (en) | Pneumatic expanding packer for oil and gas well | |
| US20140338887A1 (en) | Annular fluid containment device | |
| CN205532337U (en) | Well completion pipe string | |
| CN205422625U (en) | Water conservancy expanding cover outside of tubes separates a ware |
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 |