CN111878040A - Pressurized liquid injection system and method for coal-bed gas well - Google Patents
Pressurized liquid injection system and method for coal-bed gas well Download PDFInfo
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- CN111878040A CN111878040A CN202010646380.1A CN202010646380A CN111878040A CN 111878040 A CN111878040 A CN 111878040A CN 202010646380 A CN202010646380 A CN 202010646380A CN 111878040 A CN111878040 A CN 111878040A
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- 239000007788 liquid Substances 0.000 title claims abstract description 194
- 238000002347 injection Methods 0.000 title claims abstract description 125
- 239000007924 injection Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 80
- 239000003245 coal Substances 0.000 claims abstract description 32
- 241000191291 Abies alba Species 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims 2
- 230000006378 damage Effects 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
- E21B43/006—Production of coal-bed methane
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- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention provides a pressurized liquid injection system and method for a coal bed gas well, and belongs to the technical field of coal bed gas development. A first interface of a wellhead tee in a pressurized liquid injection system of the coal-bed gas well is connected with a wellhead pipeline of an oil production tree, a second interface is connected with a solution reservoir through a balance pressure pipe, and a third interface is connected with the solution reservoir through a liquid injection pipe; the solution reservoir is arranged on the adjusting support frame and is higher than a wellhead pipeline of the Christmas tree; the balance pressure pipe is provided with a stop valve and a throttling pressure limiting valve; the liquid injection pressure-resistant pump is arranged on the liquid injection pipe, and a stop valve is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the wellhead tee; the transparent pressure-resistant observation tank is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the stop valve. On the basis of fully utilizing gravity, the invention realizes the quick injection of liquid by means of the power of the pressure-resistant pump, improves the liquid injection efficiency, and reduces the damage to the coal-bed gas well caused by casing pressure injection after the coal-bed gas well is stopped for a long time.
Description
Technical Field
The invention belongs to the technical field of coal bed gas development, and particularly discloses a pressurized liquid injection system and method for a coal bed gas well.
Background
In the normal production process of the coal bed gas well, coal dust and coal slime appear in some wells or the drainage efficiency is low, and at the moment, some blocking remover, activator, drainage aid and the like need to be injected into the well. During normal operation, the machine must be stopped, and the target solution can be injected into the well after the casing pressure in the well is emptied. However, the shutdown and the air release operation can cause the sudden reduction of the bottom hole flow pressure, cause reservoir excitation and bring potential damage to the gas well of the coal seam. Meanwhile, the gas production is interrupted for a long time, which brings certain economic loss.
At present, no special injection process can realize the injection of the target solution into the well under the pressure state, which brings inconvenience to the development of the coal bed gas.
Disclosure of Invention
The invention aims to provide a safe, reliable, simple and efficient pressurized liquid injection system and method for a coal bed gas well, which can realize the rapid injection of liquid by means of the power of a pressure resistant pump on the basis of fully utilizing gravity, improve the liquid injection efficiency and reduce the damage to the coal bed gas well caused by casing pressurized liquid injection after the coal bed gas well is stopped.
In order to achieve the aim, the invention provides a pressurized liquid injection system of a coal-bed gas well, which comprises an oil production tree, a wellhead tee joint, a solution reservoir, a liquid injection pressure-resistant pump, a transparent pressure-resistant observation tank and an adjusting support frame for adjusting the height and the angle of the solution reservoir; a first interface of the wellhead tee is connected with a wellhead pipeline of the Christmas tree, a second interface is connected with the solution reservoir through a balance pressure pipe, and a third interface is connected with the solution reservoir through a liquid injection pipe; the solution reservoir is arranged on the adjusting support frame and is higher than a wellhead pipeline of the Christmas tree; a stop valve and a throttling pressure-limiting valve are arranged on the balance pressure pipe, the stop valve is close to the solution reservoir, and the throttling pressure-limiting valve is close to the wellhead tee; the liquid injection pressure-resistant pump is arranged on the liquid injection pipe, and a stop valve is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the wellhead tee; the transparent pressure-resistant observation tank is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the stop valve.
The pressurized liquid injection system of the coal-bed gas well further comprises a liquid mixing tank; a liquid suction pipe is arranged between the solution reservoir and the liquid mixing tank, a liquid suction pressure resistant pump is arranged on the liquid suction pipe, and a stop valve is arranged on the liquid suction pipe between the solution reservoir and the liquid suction pressure resistant pump.
Further, a pressure relief pipe is arranged on the solution reservoir, and a stop valve is installed on the pressure relief pipe.
Further, a pressure gauge is arranged on the solution reservoir.
Furthermore, the adjusting support frame comprises a support panel, a support screw rod penetrating through the support panel and a limit nut sleeved on the support screw rod; the limiting nut is positioned below the supporting panel; the solution reservoir is mounted on the support panel.
Furthermore, the supporting panel is provided with a rubber universal wheel.
Furthermore, the liquid injection pressure-resistant pump and the liquid injection pipe, the transparent pressure-resistant observation tank and the liquid injection pipe, and the liquid suction pressure-resistant pump and the liquid suction pipe are connected through loose joints.
Furthermore, the balance pressure pipe, the liquid injection pipe and the liquid suction pipe are all pressure-resistant hoses, and the pressure relief pipe is a steel pipe.
The invention also provides a coal bed gas well under-pressure liquid injection method, which is based on the coal bed gas well under-pressure liquid injection system and comprises the following steps:
s1, the coal bed gas well needs to be stopped temporarily before liquid injection, a stop valve and a throttling pressure limiting valve on a liquid injection system are both in a closed state, liquid is injected into a solution reservoir, the stop valve and the throttling pressure limiting valve on a balance pressure pipe are opened, gas in the coal bed gas well enters the solution reservoir, the throttling pressure limiting valve is adjusted, and the pressure between the stop valve and the throttling pressure limiting valve is balanced;
and S2, after pressure balance, slowly opening a stop valve on the liquid injection pipe, starting the liquid injection pressure-resistant pump to quickly inject the liquid in the solution reservoir into the well, when the liquid in the transparent pressure-resistant observation tank stops flowing, indicating that liquid injection is finished, closing the liquid injection pressure-resistant pump, and then closing the stop valves and the throttle pressure-limiting valves on the liquid injection pipe and the pressure-balancing pipe.
The invention also provides a coal bed gas well under-pressure liquid injection method, which is based on the coal bed gas well under-pressure liquid injection system and comprises the following steps:
s1, the coal-bed gas well needs to be stopped for a short time before liquid injection, a stop valve and a throttling pressure limiting valve on a liquid injection system are both in a closed state, a stop valve on a pressure relief pipe and a stop valve on a liquid suction pipe are opened, a liquid suction pressure-resistant pump is started, liquid in a liquid mixing tank is sucked into a solution reservoir, when liquid flows out from the pressure relief pipe, the solution reservoir is proved to be full, the liquid suction pressure-resistant pump is closed, and then the stop valves on the pressure relief pipe and the liquid suction pipe are closed;
s2, opening a stop valve and a throttling pressure limiting valve on the balance pressure pipe to enable gas in the coal bed gas well to enter a solution reservoir, and adjusting the throttling pressure limiting valve to balance the pressure between the two;
s3, after pressure balance, slowly opening a stop valve on a liquid injection pipe, starting a liquid injection pressure-resistant pump to quickly inject liquid in a solution reservoir into a well, when the liquid in a transparent pressure-resistant observation tank stops flowing, indicating that liquid injection is finished, closing the liquid injection pressure-resistant pump, and then closing the stop valves and the throttle pressure-limiting valves on the liquid injection pipe and the pressure-balancing pipe;
and S4, slowly opening a stop valve on the pressure relief pipe, discharging the gas in the solution reservoir, and recovering the normal pressure. And (4) removing the pressurized injection system, starting the coal bed gas well drainage and production equipment, and operating normally.
The invention has the following advantages:
(1) the operation can be carried out under pressure, the damage to the gas well caused by shutdown and casing pressure release is reduced: in taking out the solution reservoir with the solution that needs to pour into in advance, pressure in with the well is balanced with the atmospheric pressure of solution reservoir through balanced pressure pipe, opens the stop valve on annotating the liquid pipe and annotates the liquid withstand voltage pump, and solution is under the suction force combined action of gravity and pump, pours into solution into in the coal bed gas well fast, and whole process need not carry out long-time shutdown and pressure releasing operation to the coal bed gas well, has avoided annotating the influence of liquid operation to coal bed gas well normal production, has reduced coal bed gas well's potential injury.
(2) Simple structure, convenient operation: the core component of the system is composed of a solution reservoir and an adjusting support frame, through simple design, the height of the system can be adjusted, the system can be moved freely through universal wheels, a tee joint is simply connected to a coal bed gas wellhead, the system can be connected with the solution reservoir through a pressure-resistant hose, the materials are common and easy to replace, the connection and operation mode of the whole system is simple, and the operation is convenient.
Drawings
FIG. 1 is a schematic structural diagram of a pressurized injection system of a coal-bed gas well.
In the figure: 1-a Christmas tree; 1.1-polished rod; 1.2-valve; 1.3-a drain pipe; 2-wellhead tee joint; 3-a solution reservoir; 4-liquid injection pressure-resistant pump; 5-transparent pressure-resistant observation tank; 6-a balanced pressure pipe; 7-liquid injection pipe; 8-a stop valve; 9-a throttling pressure limiting valve; 10-a liquid mixing tank; 11-a pipette; 12-a liquid suction pressure resistant pump; 13-pressure relief pipes; 14-pressure gauge; 15-a support panel; 16-a support screw; 17-rubber universal wheels; 18-loose joint.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a pressurized liquid injection system of a coal-bed gas well, which comprises a Christmas tree 1, a wellhead tee 2, a solution reservoir 3, a liquid injection pressure-resistant pump 4, a transparent pressure-resistant observation tank 5 and an adjusting support frame for adjusting the height and the angle of the solution reservoir 3; a first interface of the wellhead tee joint 2 is connected with a wellhead pipeline of the Christmas tree 1, a second interface is connected with the solution reservoir 3 through a balance pressure pipe 6, and a third interface is connected with the solution reservoir 3 through a liquid injection pipe 7; the solution reservoir 3 is arranged on the adjusting support frame and is higher than a wellhead pipeline of the Christmas tree 1; a stop valve 8 and a throttling pressure-limiting valve 9 are arranged on the balance pressure pipe 6, the stop valve 8 is close to the solution reservoir 3, and the throttling pressure-limiting valve 9 is close to the wellhead tee 2; the liquid injection pressure resistant pump 4 is arranged on the liquid injection pipe 7, and a stop valve 8 is arranged on the liquid injection pipe 7 between the liquid injection pressure resistant pump 4 and the wellhead tee 2; the transparent pressure-resistant observation tank 5 is provided on the liquid injection pipe 7 between the liquid injection pressure-resistant pump 4 and the shutoff valve 8.
The pressurized liquid injection system of the coal-bed gas well further comprises a liquid mixing tank 10; a liquid suction pipe 11 is arranged between the solution reservoir 3 and the liquid mixing tank 10, a liquid suction pressure resistant pump 12 is arranged on the liquid suction pipe 11, and a stop valve 8 is arranged on the liquid suction pipe 11 between the solution reservoir 3 and the liquid suction pressure resistant pump 12.
Further, a pressure relief pipe 13 is arranged on the solution reservoir 3, and a stop valve 8 is arranged on the pressure relief pipe 13.
Further, the solution reservoir 3 is provided with a pressure gauge 14 for observing pressure changes in the solution reservoir 3 at any time.
Furthermore, the adjusting support frame comprises a support panel 15, a support screw 16 penetrating through the support panel 15 and a limit nut sleeved on the support screw 16; the limit nut is positioned below the support panel 15; the solution reservoir 3 is mounted on a support panel 15. When liquid is injected, one side of the solution reservoir 3 connected with the liquid injection pipe 7 is adjusted to be low by adjusting nuts on the four supporting screw rods 15, and the height of the side is far higher than that of the wellhead tee joint 2, so that the liquid can flow and be injected conveniently.
Further, the supporting panel 15 is provided with a rubber universal wheel 17, and after the supporting lead screw 16 is taken down, the supporting panel 15 can move the position of the solution reservoir 3 by means of the rubber universal wheel 17, which is convenient.
Furthermore, the liquid injection pressure resistant pump 4 and the liquid injection pipe 7, the transparent pressure resistant observation tank 5 and the liquid injection pipe 7, and the liquid suction pressure resistant pump 12 and the liquid suction pipe 11 are connected through movable joints 18.
Furthermore, the balance pressure pipe 6, the liquid injection pipe 7 and the liquid suction pipe 11 are all pressure-resistant hoses, and the pressure relief pipe 13 is a steel pipe.
Specifically, the solution reservoir 3 is cylindrical, has a volume of about 100L, has a pressure bearing capacity of more than 2Mpa, and is provided with 5 interfaces, namely an external liquid suction inlet (connected with a pipette 11), a casing pressure balance port (connected with a balance pressure pipe 6), an internal well injection port (connected with a liquid injection pipe 7), a pressure relief discharge port (connected with a pressure relief pipe 13), and a pressure gauge mounting port (connected with a pressure gauge 14); the pressure of the pressure-resistant pump is 1 Mpa; the first interface of well head tee bend 2 is connected with the well head pipeline screw thread of production tree 1, and two other interfaces welding reducing flange become 25.4mm by diameter 50mm, are convenient for be connected with 1 inch's withstand voltage hose.
Example 2
The embodiment provides a coal bed gas well under-pressure liquid injection method, which is based on the coal bed gas well under-pressure liquid injection system and comprises the following steps:
s1, before liquid injection, both the stop valve 8 and the throttle pressure limiting valve 9 are in a closed state, liquid is injected into the solution reservoir 3, the stop valve 8 and the throttle pressure limiting valve 9 on the balance pressure pipe 6 are opened, gas in the coal bed gas well enters the solution reservoir 3, the throttle pressure limiting valve 9 is adjusted, and the pressure between the two is balanced;
s2, after pressure balance, slowly opening the stop valve 8 on the liquid injection pipe 7, starting the liquid injection pressure resistant pump 4 to quickly inject the liquid in the solution reservoir 3 into the well, when the liquid in the transparent pressure resistant observation tank 5 stops flowing, indicating that the liquid injection is finished, closing the liquid injection pressure resistant pump 4, and then closing the stop valve 8 and the throttle pressure limiting valve 9 on the liquid injection pipe 7 and the balance pressure pipe 6.
Example 3
The embodiment provides a coal bed gas well under-pressure liquid injection method, which is based on the coal bed gas well under-pressure liquid injection system and comprises the following steps:
s1, before liquid injection, the stop valve 8 and the throttle pressure limiting valve 9 are both in a closed state, the stop valve 8 on the pressure relief pipe 13 and the stop valve 8 on the liquid suction pipe 11 are opened, the liquid suction pressure-resistant pump 12 is started, liquid in the liquid mixing tank 10 is sucked into the solution reservoir 3, when liquid flows out from the pressure relief pipe 13, the solution reservoir 3 is proved to be full, the liquid suction pressure-resistant pump 12 is closed, and then the stop valves 8 on the pressure relief pipe 13 and the liquid suction pipe 11 are closed;
s2, opening a stop valve 8 and a throttling pressure limiting valve 9 on the balance pressure pipe 6 to enable gas in the coal bed gas well to enter the solution reservoir 3, adjusting the throttling pressure limiting valve 9 and balancing the pressure between the two;
s3, after pressure balance, slowly opening the stop valve 8 on the liquid injection pipe 7, starting the liquid injection pressure resistant pump 4 to quickly inject the liquid in the solution reservoir 3 into the well, when the liquid in the transparent pressure resistant observation tank 5 stops flowing, indicating that the liquid injection is finished, closing the liquid injection pressure resistant pump 4, and then closing the stop valve 8 and the throttle pressure limiting valve 9 on the liquid injection pipe 7 and the balance pressure pipe 6;
s4, slowly opening the stop valve 8 on the pressure relief pipe 13, discharging the gas in the solution reservoir 3, and recovering the normal pressure;
s5, if the solution is required to be injected continuously, the stop valve 8 of the liquid suction pipe 11 is opened, and the liquid suction pressure-resistant pump 12 is started to perform the next liquid injection cycle.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A pressurized liquid injection system of a coal-bed gas well is characterized by comprising an oil production tree, a wellhead tee joint, a solution reservoir, a liquid injection pressure-resistant pump, a transparent pressure-resistant observation tank and an adjusting support frame for adjusting the height and the angle of the solution reservoir;
a first interface of the wellhead tee is connected with a wellhead pipeline of the Christmas tree, a second interface is connected with the solution reservoir through a balance pressure pipe, and a third interface is connected with the solution reservoir through a liquid injection pipe;
the solution reservoir is arranged on the adjusting support frame and is higher than a wellhead pipeline of the Christmas tree;
the balance pressure pipe is provided with a stop valve and a throttling pressure-limiting valve, the stop valve is close to the solution reservoir, and the throttling pressure-limiting valve is close to the wellhead tee;
the liquid injection pressure-resistant pump is arranged on the liquid injection pipe, and a stop valve is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the wellhead tee;
the transparent pressure-resistant observation tank is arranged on the liquid injection pipe between the liquid injection pressure-resistant pump and the stop valve.
2. The pressurized liquid injection system for the coal-bed gas well is characterized by further comprising a liquid mixing tank;
a liquid suction pipe is arranged between the solution reservoir and the liquid mixing tank, a liquid suction pressure resistant pump is arranged on the liquid suction pipe, and a stop valve is arranged on the liquid suction pipe between the solution reservoir and the liquid suction pressure resistant pump.
3. The pressurized liquid injection system for the coal-bed gas well as recited in claim 2, characterized in that a pressure relief pipe is arranged on the solution reservoir, and a stop valve is arranged on the pressure relief pipe.
4. The pressurized injection system for the coal-bed gas well as claimed in claim 3, wherein a pressure gauge is arranged on the solution reservoir.
5. The pressurized liquid injection system for the coal-bed gas well as claimed in claim 1, wherein the adjusting support frame comprises a support panel, a support screw rod penetrating the support panel and a limit nut sleeved on the support screw rod;
the limiting nut is positioned below the supporting panel;
the solution reservoir is mounted on the support panel.
6. The pressurized liquid injection system for the coal-bed gas well as claimed in claim 5, wherein rubber universal wheels are mounted on the supporting panel.
7. The pressurized liquid injection system for the coal-bed gas well as claimed in claim 3, wherein the liquid injection pressure-resistant pump and the liquid injection pipe, the transparent pressure-resistant observation tank and the liquid injection pipe, and the liquid absorption pressure-resistant pump and the liquid absorption pipe are all connected through loose joints.
8. The pressurized liquid injection system for the coal-bed gas well as recited in claim 3, characterized in that the balance pressure pipe, the liquid injection pipe and the liquid suction pipe are all pressure-resistant hoses, and the pressure relief pipe is a steel pipe.
9. The under-pressure liquid injection method of the coal-bed gas well is characterized by comprising the following steps of:
s1, before liquid injection, both the stop valve and the throttling pressure limiting valve are in a closed state, liquid is injected into the solution reservoir, the stop valve and the throttling pressure limiting valve on the balance pressure pipe are opened, gas in the coal bed gas well enters the solution reservoir, the throttling pressure limiting valve is adjusted, and the pressure between the stop valve and the throttling pressure limiting valve is balanced;
and S2, after pressure balance, slowly opening a stop valve on the liquid injection pipe, starting the liquid injection pressure-resistant pump to quickly inject the liquid in the solution reservoir into the well, when the liquid in the transparent pressure-resistant observation tank stops flowing, indicating that liquid injection is finished, closing the liquid injection pressure-resistant pump, and then closing the stop valves and the throttle pressure-limiting valves on the liquid injection pipe and the pressure-balancing pipe.
10. The under-pressure liquid injection method of the coal-bed gas well is characterized by comprising the following steps of:
s1, before liquid injection, the stop valve and the throttling pressure limiting valve are both in a closed state, the stop valve on the pressure relief pipe and the stop valve on the liquid suction pipe are opened, the liquid suction pressure-resistant pump is started, liquid in the liquid mixing tank is sucked into the solution reservoir, when liquid flows out from the pressure relief pipe, the solution reservoir is full, the liquid suction pressure-resistant pump is closed, and then the stop valves on the pressure relief pipe and the liquid suction pipe are closed;
s2, opening a stop valve and a throttling pressure limiting valve on the balance pressure pipe to enable gas in the coal bed gas well to enter a solution reservoir, and adjusting the throttling pressure limiting valve to balance the pressure between the two;
s3, after pressure balance, slowly opening a stop valve on a liquid injection pipe, starting a liquid injection pressure-resistant pump to quickly inject liquid in a solution reservoir into a well, when the liquid in a transparent pressure-resistant observation tank stops flowing, indicating that liquid injection is finished, closing the liquid injection pressure-resistant pump, and then closing the stop valves and the throttle pressure-limiting valves on the liquid injection pipe and the pressure-balancing pipe;
and S4, slowly opening a stop valve on the pressure relief pipe, discharging the gas in the solution reservoir, and recovering the normal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646380.1A CN111878040A (en) | 2020-07-07 | 2020-07-07 | Pressurized liquid injection system and method for coal-bed gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646380.1A CN111878040A (en) | 2020-07-07 | 2020-07-07 | Pressurized liquid injection system and method for coal-bed gas well |
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| Publication Number | Publication Date |
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| CN111878040A true CN111878040A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010646380.1A Pending CN111878040A (en) | 2020-07-07 | 2020-07-07 | Pressurized liquid injection system and method for coal-bed gas well |
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| CN201391283Y (en) * | 2009-03-30 | 2010-01-27 | 大庆油田有限责任公司 | Self-balance closed medicine feeding device |
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| CN105715963A (en) * | 2014-12-23 | 2016-06-29 | 重庆恬愉石油技术有限公司 | Filling system with pressure self-balancing function |
| US20160327960A1 (en) * | 2014-01-03 | 2016-11-10 | Beijing Haobo Wanwei Technology Co., Ltd | Drug dosing device and method for dosage metering and control |
| CN205778787U (en) * | 2016-05-27 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of coal bed gas well dosing with pressure watering device |
| CN205827897U (en) * | 2016-06-26 | 2016-12-21 | 孙平波 | A kind of accordion rack |
| CN206495662U (en) * | 2016-12-30 | 2017-09-15 | 中国石油集团渤海石油装备制造有限公司 | Pressure self-balancing oil wellhead chemical agent adding device |
| CN207348834U (en) * | 2017-09-01 | 2018-05-11 | 中国石油化工股份有限公司 | One kind extracts and the compound gas production system of foaming water discharge |
| CN207934867U (en) * | 2018-03-05 | 2018-10-02 | 沈剑 | High pressure moves chemicals dosing plant |
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2020
- 2020-07-07 CN CN202010646380.1A patent/CN111878040A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201391283Y (en) * | 2009-03-30 | 2010-01-27 | 大庆油田有限责任公司 | Self-balance closed medicine feeding device |
| US20160327960A1 (en) * | 2014-01-03 | 2016-11-10 | Beijing Haobo Wanwei Technology Co., Ltd | Drug dosing device and method for dosage metering and control |
| CN105715963A (en) * | 2014-12-23 | 2016-06-29 | 重庆恬愉石油技术有限公司 | Filling system with pressure self-balancing function |
| CN204920927U (en) * | 2015-08-05 | 2015-12-30 | 中国石油化工股份有限公司 | Adjustable pressure balance type of flow system that marks |
| CN205778787U (en) * | 2016-05-27 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of coal bed gas well dosing with pressure watering device |
| CN205827897U (en) * | 2016-06-26 | 2016-12-21 | 孙平波 | A kind of accordion rack |
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| CN207934867U (en) * | 2018-03-05 | 2018-10-02 | 沈剑 | High pressure moves chemicals dosing plant |
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Application publication date: 20201103 |