CN112343556A - Offshore gas well coiled tubing flowing back tubular column - Google Patents
Offshore gas well coiled tubing flowing back tubular column Download PDFInfo
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- CN112343556A CN112343556A CN202011391021.2A CN202011391021A CN112343556A CN 112343556 A CN112343556 A CN 112343556A CN 202011391021 A CN202011391021 A CN 202011391021A CN 112343556 A CN112343556 A CN 112343556A
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- pipe column
- coiled tubing
- gas well
- oil pipe
- safety valve
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- 238000005520 cutting process Methods 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 7
- 210000002445 nipple Anatomy 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 40
- 238000004519 manufacturing process Methods 0.000 abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 abstract description 8
- 239000002343 natural gas well Substances 0.000 abstract description 8
- 239000003345 natural gas Substances 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 24
- 238000011161 development Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003672 gas field water Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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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 belongs to the technical field of oil and gas exploitation equipment, and particularly relates to a coiled tubing drainage pipe column of an offshore gas well. The packer comprises an oil pipe, wherein the oil pipe is sequentially sleeved with a packer and a safety valve from bottom to top; the oil pipe is characterized by also comprising a speed pipe column, wherein the speed pipe column is hung in the oil pipe through a connecting piece, and an annular channel is formed between the outer wall of the speed pipe column and the inner wall of the oil pipe; the outer wall of the speed pipe column is sleeved with a plug, and the plug is located between the safety valve and the packer. By adopting the device, the original production pipe column can be kept in the later gas production process of the natural gas well, the continuous and stable production of the natural gas well is ensured, meanwhile, the drainage treatment of the accumulated liquid is realized, the technical requirement on the offshore well control safety can be met, and the safety and the environmental protection of the offshore natural gas production are ensured.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation equipment, and particularly relates to a coiled tubing drainage pipe column of an offshore gas well.
Background
Offshore natural gas wells, especially those of offshore fixed platform structure type, are the main force of gas production in offshore natural gas development in our country. Through efficient development of nearly twenty years, the whole offshore natural gas field enters the middle and later development stages at present, various problems are obvious, the yield is reduced gradually, the situation is severe, how to adjust and optimize the development scheme is to fully excavate the internal reserves and yield potential of the old gas field, and the improvement of the development effect of the old gas field becomes the key point and difficulty of development and is also a common technical problem faced by various developed offshore natural gas fields.
The key technology is as follows: in the later development stage, natural gas wells are flooded with water and produce water to different degrees, and the early research depth on the water production problem of the gas field is not enough, so that the existing gas field production pipe column does not have the measures of later drainage, gas production, water plugging and control and the like, thereby bringing great limitation to the treatment of the gas field water wells and greatly influencing the productivity of the gas wells. Therefore, from the requirement of a gas well completion process, the requirement of liquid loading control by a stationary tubular column in the later period needs to be fully considered, and liquid loading stop is avoided, so that continuous stable production of a gas field and stable gas supply of the gas field are guaranteed.
Chinese patent CN103670336A, published as 2014.03.26, discloses a middle and shallow layer gas well drainage process pipe column and a drainage method, which solve the problem of liquid accumulation and drainage but have poor safety performance.
Disclosure of Invention
The invention aims to overcome at least one defect in the prior art, and provides the coiled tubing drainage pipe column for the offshore gas well, which can solve the drainage problem while ensuring continuous and stable gas production and has high safety performance.
In order to solve the technical problems, the invention adopts the technical scheme that: a coiled tubing drainage pipe column of an offshore gas well comprises an oil pipe, wherein a packer and a safety valve are sequentially sleeved on the oil pipe from bottom to top; the oil pipe comprises an oil pipe body, a speed pipe column and a connecting piece, wherein the speed pipe column is hung in the oil pipe body through the connecting piece, and an annular channel is formed between the outer wall of the speed pipe column and the inner wall of the oil pipe; the outer wall of the speed pipe column is sleeved with a plug, and the plug is located between the safety valve and the packer. A speed pipe column is hung in the original production oil pipe, an annular channel is formed between the speed pipe column and the inner wall of the crude oil pipe, the bottom of the speed pipe column is blocked, and gas can only be discharged from the annular channel; due to the fact that the speed pipe column is added, the gas channel of the original production oil pipe is reduced, and therefore the gas channel is reduced under the condition that the gas production speed is not changed, the flow rate of gas is increased, and effusion can be brought out together by the aid of fast flowing gas to be discharged. In addition, due to the insertion of the speed pipe column, the original safety valve cannot be normally used, the blanking plug is arranged, when the oil pipe is normally used for production operation, the blanking plug is kept in a contraction state, when the annular channel for exhausting is required to be closed under abnormal conditions in offshore production, the blanking plug can be opened through wellhead operation and is in an opening state, so that the upper and lower communication of the annular channel is blocked, and the gas is blocked from being continuously exhausted out of the well. By adopting the device, the original production pipe column can be kept in the later gas production process of the natural gas well, the continuous and stable production of the natural gas well is ensured, meanwhile, the drainage treatment of the accumulated liquid is realized, the technical requirement on the offshore well control safety can be met, and the safety and the environmental protection of the offshore natural gas production are ensured.
In one embodiment, the end of the velocity string at the wellhead is provided with a well control device for cutting off the velocity string. When the offshore production operation meets a high risk condition, the speed pipe column is cut off by the well control device only under the condition that the safety can not be ensured by the blocking effect of the blanking plug, and the quick-break pipe column falls below the safety valve, so that the safety valve can be normally used, and the safety valve is closed to ensure the safety.
In one embodiment, the outer wall of the speed pipe column is provided with a fishing thrower, and the fishing thrower is positioned between the safety valve and the well control device; the inner wall of the oil pipe is provided with an anti-drop short section which is arranged between the blanking plug and the packer; the thickness value M of the salvaging and releasing tool is larger than the minimum distance value L between the anti-drop short section and the speed pipe column. The salvaging release is matched with the anti-falling short section, and when the speed pipe column is cut off and falls, the salvaging release is clamped by the anti-falling short section, so that the speed pipe column cannot continuously fall to the bottom of the well; when the danger is relieved, the fishing releasing hand is fished through the fishing tool through the well mouth operation, so that the speed pipe column is fished, and the production can be recovered after the speed pipe column is newly connected and repaired.
In one embodiment, the connecting member is a first tubing hanger, and a second tubing hanger is mounted at the orifice of the tubing.
In one embodiment, the well control device comprises a circular cutter and a control gate for controlling the movement of the circular cutter, wherein the circular cutter is connected with the control gate, and the control gate is fixed at the bottom of the first tubing hanger or/and the top of the second tubing hanger. The flashboard is controlled to control the annular cutter, so that the cutting-off operation of the speed pipe column is realized; by shearing the well control command, the well control flashboard can perform reducing ring cutting on the speed pipe column within 90 seconds to shear the speed pipe column.
In one embodiment, the distance between the plug and the safety valve is 6-15 m.
In one embodiment, the distance between the anti-drop short section and the safety valve is 10-20 meters.
In one embodiment, the distance between the fishing releasing tool and the well control device is 1-2 meters.
In one embodiment, one end of the bottom of the salvaging and releasing tool is provided with a first buffering inclined plane; and one end of the top of the anti-falling short section is provided with a second inclined plane which is matched with the first inclined plane and used for buffering. The first inclined plane and the second inclined plane that are used for buffering that set up mutually support can slow down impact force each other when salvaging the release and preventing falling nipple joint contact to guarantee that the speed tubular column is not damaged at the in-process that falls down.
In one embodiment, the system further comprises a pilot-controlled pipeline, and the pilot-controlled pipeline is connected with the safety valve.
Compared with the prior art, the beneficial effects are: the offshore gas well coiled tubing drainage pipe column provided by the invention is simple in structure, and the original production tubing does not need to be replaced by using the device provided by the invention, so that drainage treatment of accumulated liquid is realized while continuous production is ensured, the technical requirement on offshore well control safety can be met, and the safety and environmental protection of offshore natural gas production are ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Reference numerals: 1. an oil pipe; 2. a packer; 3. a safety valve; 4. a velocity string; 5. a blanking plug; 6. a well control device; 7. salvaging and releasing the hands; 8. a drop-proof short section; 9. a first tubing hanger; 10. a second tubing hanger; 11. a hydraulic control line.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
As shown in fig. 1, the drainage pipe column of the coiled tubing 1 of the offshore gas well comprises an oil pipe 1, wherein the oil pipe 1 is sequentially sleeved with a packer 2 and a safety valve 3 from bottom to top, and a hydraulic control pipeline 11 is connected with the safety valve 3; the device comprises an oil pipe 1, a speed pipe column 4 and a connecting piece, wherein the speed pipe column 4 is hung in the oil pipe 1 through the connecting piece, and an annular channel is formed between the outer wall of the speed pipe column 4 and the inner wall of the oil pipe 1; the outer wall of the speed pipe column 4 is sleeved with a blanking plug 5, and the blanking plug 5 is positioned between the safety valve 3 and the packer 2. A speed pipe column 4 is hung in the original production oil pipe 1, an annular channel is formed between the speed pipe column 4 and the inner wall of the original oil pipe 1, and gas is discharged from the annular channel; due to the addition of the speed pipe column 4, the gas channel of the original production oil pipe 1 is reduced, so that the gas channel is reduced under the condition that the gas production speed is unchanged, the flow rate of gas is increased, and the effusion can be brought out together by the rapidly flowing gas so as to be discharged. In addition, due to the insertion of the speed pipe column 4, the original safety valve 3 cannot be normally used, the blanking plug 5 is arranged, when the oil pipe 1 is normally operated, the blanking plug 5 keeps a contraction state, when the offshore production meets an abnormal condition and needs to close the annular exhaust channel, the blanking plug 5 can be opened through wellhead operation to be in an opening state, so that the annular channel is blocked from being communicated up and down, and the gas is blocked from being continuously exhausted out of the well. By adopting the device, the original production pipe column can be kept in the later gas production process of the natural gas well, the continuous and stable production of the natural gas well is ensured, meanwhile, the drainage treatment of the accumulated liquid is realized, the technical requirement on the offshore well control safety can be met, and the safety and the environmental protection of the offshore natural gas production are ensured.
In one embodiment, the end of the velocity string 4 at the wellhead is provided with a well control device 6 for cutting off the velocity string 4. When the offshore production operation meets a high risk condition, the speed pipe column 4 is cut off by the well control device 6 only under the condition that the safety can not be ensured by the blocking effect of the blanking plug 5, and the quick-break pipe column falls below the safety valve 3, so that the safety valve 3 can be normally used, and the safety valve 3 is closed to ensure the safety.
In another embodiment, the outer wall of the speed pipe column 4 is provided with a fishing thrower 7, and the fishing thrower 7 is positioned between the safety valve 3 and the well control device 6; the inner wall of the oil pipe 1 is provided with an anti-drop short section 8, and the anti-drop short section 8 is arranged between the blanking plug 5 and the packer 2; the thickness value M of the salvaging releasing gadget 7 is larger than the minimum distance value L between the anti-drop short section 8 and the speed pipe column 4. The fishing thrower 7 is matched with the anti-falling short section 8, and when the speed pipe column 4 is cut off and falls, the fishing thrower 7 is clamped by the anti-falling short section 8, so that the speed pipe column 4 cannot continuously fall to the bottom of the well; when the danger is relieved, the fishing releasing hand 7 is fished by a fishing tool through wellhead operation, so that the speed pipe column 4 is fished, and the production can be recovered after the speed pipe column 4 is newly connected and repaired.
In some embodiments, the connection member is a first tubing hanger 9, and a second tubing hanger 10 is installed at the orifice of the tubing 1.
In one embodiment, the well control device 6 comprises a circular cutter and a control gate for controlling the movement of the circular cutter, the circular cutter is connected with the control gate, and the control gate is fixed at the bottom of the first tubing hanger 9 or/and the top of the second tubing hanger 10. The flashboard is controlled to control the annular cutter, so that the cutting-off operation of the speed pipe column 4 is realized; by shearing the well control command, the well control gate plate can perform reducing ring cutting on the velocity string 4 within 90 seconds to shear the velocity string 4.
In one embodiment, the distance between the plug 5 and the safety valve 3 is 6-15 m.
The distance value between the anti-drop short section 8 and the safety valve 3 is 10-20 meters. The distance value between the salvaging releasing gadget 7 and the well control device 6 is 1-2 meters.
In another embodiment, one end of the bottom of the fishing thrower 7 is provided with a first buffering inclined surface; and one end of the top of the anti-falling short section 8 is provided with a second inclined plane which is matched with the first inclined plane and used for buffering. The first inclined plane and the second inclined plane that are used for buffering that set up mutually support can slow down impact force each other when salvaging release 7 and preventing the contact of short section 8 that falls to guarantee that speed tubular column 4 is not damaged at the in-process that falls.
The working principle is as follows:
under the condition of normal production operation, the speed pipe column 4 is hung in the oil pipe 1, and gas and liquid are discharged out of the well from an annular channel between the speed pipe column 4 and the oil pipe 1; when the offshore operation is in a low risk condition, the blanking plug 5 is opened through wellhead operation, the annular channel is plugged through the blanking plug 5, and the safety technical requirements of offshore well control are met; under the condition of high risk encountered in offshore operation, through a given shearing well control command, the well control flashboard realizes the reducing circular cutting of the speed pipe column 4 within 90 seconds, the speed pipe column 4 is cut off, at the moment, the speed pipe column 4 drops in a pipe under the action of self weight, in the falling process, due to the arrangement of the anti-falling short section 8 and the fishing thrower 7, the anti-falling short section 8 can carry out damping capture on the fishing thrower 7, the fishing thrower 7 is clamped, and the speed pipe column 4 is prevented from dropping to the bottom of the well; at the moment, the safety valve 3 can be normally used, the safety valve 3 is closed, and safety prevention and control are improved; after the abnormal risk is contacted, a fishing tool can be put in through the wellhead, the fishing release 7 is fished, the speed pipe column 4 is fished, and after the speed pipe column 4 is repaired and connected again, normal production can be recovered.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A coiled tubing drainage pipe column of an offshore gas well comprises an oil pipe (1), wherein a packer (2) and a safety valve (3) are sequentially sleeved on the oil pipe (1) from bottom to top; the device is characterized by further comprising a speed pipe column (4), wherein the speed pipe column (4) is hung in the oil pipe (1) through a connecting piece, and an annular channel is formed between the outer wall of the speed pipe column (4) and the inner wall of the oil pipe (1); the outer wall of the speed pipe column (4) is sleeved with a blanking plug (5), and the blanking plug (5) is located between the safety valve (3) and the packer (2).
2. Offshore gas well coiled tubing drainage string as claimed in claim 1, characterized in that the end of the velocity string (4) at the wellhead is provided with a well control device (6) for cutting off the velocity string (4).
3. The offshore gas well coiled tubing drainage string as recited in claim 2, characterized in that the outer wall of the velocity string (4) is provided with a salvage release (7), and the salvage release (7) is positioned between the safety valve (3) and the well control device (6); the inner wall of the oil pipe (1) is provided with an anti-drop short section (8), and the anti-drop short section (8) is arranged between the blanking plug (5) and the packer (2); the thickness value M of the salvaging releasing tool (7) is larger than the minimum distance value L between the anti-drop short section (8) and the speed pipe column (4).
4. Offshore gas well coiled tubing drainage string as claimed in claim 3, characterized in that the connection member is a first tubing hanger (9) and a second tubing hanger (10) is mounted at the orifice of the tubing (1).
5. Offshore gas well coiled tubing drainage string as claimed in claim 4, characterized in that the well control device (6) comprises a circular cutting knife and a control gate for controlling the movement of the circular cutting knife, the circular cutting knife is connected with the control gate, and the control gate is fixed at the bottom of the first tubing hanger (9) or/and the top of the second tubing hanger (10).
6. The offshore gas well coiled tubing drainage string as recited in claim 3, characterized in that the distance between the plug (5) and the safety valve (3) has a value of 6-15 meters.
7. The offshore gas well coiled tubing drainage string as recited in claim 6, wherein the distance between the anti-drop nipple (8) and the safety valve (3) is 10-20 m.
8. The offshore gas well coiled tubing drainage string as recited in claim 7, wherein the distance between the fishing thrower (7) and the well control device (6) is 1-2 m.
9. The coiled tubing drainage string according to any one of claims 3 to 8, wherein one end of the bottom of the salvaging thrower (7) is provided with a first inclined buffer surface; one end of the top of the anti-falling short section (8) is provided with a second inclined plane which is matched with the first inclined plane and used for buffering.
10. The coiled tubing drainage string of claim 9, further comprising a pilot operated line (11), wherein the pilot operated line (11) is connected to the relief valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011391021.2A CN112343556A (en) | 2020-12-02 | 2020-12-02 | Offshore gas well coiled tubing flowing back tubular column |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011391021.2A CN112343556A (en) | 2020-12-02 | 2020-12-02 | Offshore gas well coiled tubing flowing back tubular column |
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| CN112343556A true CN112343556A (en) | 2021-02-09 |
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| CN202011391021.2A Pending CN112343556A (en) | 2020-12-02 | 2020-12-02 | Offshore gas well coiled tubing flowing back tubular column |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116104456A (en) * | 2023-04-14 | 2023-05-12 | 陕西航天德林科技集团有限公司 | Drainage gas production system and drainage gas production method |
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