CN108386173B - Underground dosing device and method for foam drainage gas production process - Google Patents
Underground dosing device and method for foam drainage gas production process Download PDFInfo
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- CN108386173B CN108386173B CN201810258313.5A CN201810258313A CN108386173B CN 108386173 B CN108386173 B CN 108386173B CN 201810258313 A CN201810258313 A CN 201810258313A CN 108386173 B CN108386173 B CN 108386173B
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- gas
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- nitrogen
- foam
- liquid phase
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- 239000006260 foam Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 95
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 34
- 239000012071 phase Substances 0.000 claims description 30
- 239000007791 liquid phase Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007792 gaseous phase Substances 0.000 claims 3
- 238000003756 stirring Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005187 foaming Methods 0.000 abstract description 4
- 239000013051 drainage agent Substances 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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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)
Abstract
The invention discloses an underground dosing device and method for a foam drainage gas production process. The method comprises the following steps: determining the filling flow rates of the foam discharging agent and the nitrogen; opening a nitrogen supply system; opening the foam discharging agent supply system; and dynamically adjusting the filling flow of the foam discharging agent and the nitrogen. The invention can control the stirring strength of the underground stirrer by adjusting the nitrogen injection amount, and can effectively enhance the foaming effect particularly for gas wells with low gas production rate, thereby improving the foam drainage efficiency and the application range.
Description
Technical Field
The invention relates to a foam drainage gas production technology in the field of natural gas exploitation, in particular to an underground chemical adding device and method for foam drainage gas production.
Background
In the development process of the gas reservoir, the formation pressure is continuously reduced along with the gas production, the gas production rate is gradually reduced, and finally gas cannot bring out liquid from a shaft, so that bottom hole liquid accumulation is caused. The injection of foam flooding agents into the wellbore is an economical and well-established water and gas production process, which is known as foam drainage. The process is characterized in that a foam discharging agent is injected, so that liquid accumulated in a shaft is foamed under the stirring of produced gas, the density of the mixture is reduced, and accumulated liquid at the bottom of the shaft is discharged.
The effective generation of a large amount of foam is a decisive factor for determining the effect of the foam drainage gas production process, and the foam generation needs to mix the foam drainage agent with the bottom accumulated liquid and fully stir the mixture with the natural gas produced by the stratum. There are several methods for improving the efficiency of foam generation. A capillary injection mode used in a patent application with the application number of 201210215258.4, namely a liquid foaming agent injection method, and a patent application with the application number of 201310199496.5, namely an automatic dosing device and method under a foam drainage and gas production well can directly inject a foam drainage agent to a position below the liquid level of a liquid accumulation so that the foam drainage agent is more fully contacted with the liquid accumulation at the bottom of the well. In the patent application 201510295693.6, a cohesive foam drainage stirrer is used, and gas-liquid stirring is increased by means of the generated gas to drive a blade to rotate. The methods improve the foaming effect to a certain extent, but the mixing degree of the foam discharging agent and the bottom hole effusion and the gas-liquid stirring intensity are completely determined by the gas production rate, and the ground operators cannot consider the control. For wells with low gas production, bubble flow is below the liquid loading level and the produced gas is not sufficiently agitated to form a large number of bubbles.
The invention aims to overcome the defects of the existing foam drainage gas production process and provide an underground chemical adding device and method capable of fully mixing a foam drainage agent and bottom-hole accumulated liquid in a gas well with low gas production rate and improving gas-liquid stirring strength.
Disclosure of Invention
The invention aims to overcome the defects of the existing foam drainage gas production technology, provides an underground dosing device for a foam drainage gas production technology, and aims to solve the problems of uneven mixing of injected foam drainage agent and bottom hole effusion and insufficient gas-liquid stirring. In order to achieve the above technical objects, the present invention provides the following technical solutions.
The invention relates to an underground chemical adding device for a foam drainage gas production process, which mainly comprises a chemical storage tank, a liquid phase capillary tube, an injection pump, a liquid phase flow control valve, a liquid flowmeter, a liquid phase check valve, a nitrogen gas source, a compressor, a gas storage tank, a gas phase capillary tube, a gas flowmeter, a gas phase flow control valve, a gas phase check valve, an oil pipe, a sleeve pipe and an underground stirrer.
The medicine storage tank is sequentially connected with the injection pump, the liquid flowmeter, the liquid phase flow control valve and the liquid check valve in series by virtue of the liquid phase capillary tube to form a foam discharging agent supply system; the nitrogen gas source is sequentially connected with the compressor, the gas storage tank, the gas flowmeter, the gas flow control valve and the gas check valve in series by virtue of the gas phase capillary tube to form a nitrogen gas supply system; the liquid phase capillary and the gas phase capillary are bound together and are lowered into the bottom of the well from the well head through an oil pipe, and the liquid phase capillary is communicated with the gas phase capillary at the upstream of a bottom stirrer; the underground stirrer mainly comprises a bearing, an outer rotating blade, a power hole, a mixing chamber, an inner rotating blade and a stirrer barrel; the gas-phase capillary tube is hermetically connected with the bearing through spot welding.
The mixing cavity provides a space for the gas-phase capillary tube to fully mix the foam discharging agent and the nitrogen so as to improve the mixing degree of gas phase and liquid phase; the number of the outer rotating blades is 6, and the outer rotating blades are uniformly connected to the outer side of the stirrer cylinder body in a spot welding mode; the number of the inner rotating blades is 4, the inner rotating blades are uniformly connected to the inner side of the stirrer cylinder body in a spot welding mode, and the rotating direction of the blades is opposite to that of the outer rotating blades; the number of the power holes is 4, and the positions of the power holes correspond to the inner rotating blades in an adaptive mode.
The invention relates to an underground dosing method for a foam drainage gas production process, which comprises the following steps: 1. respectively determining the injection flow rates of the foam discharging agent and the nitrogen according to the production conditions such as the pressure difference of an oil jacket of a gas well, the gas production rate and the like; 2. opening a compressor, and adjusting the flow rate of nitrogen to the filling flow rate required by the gas well by adjusting a gas phase flow control valve; 3. opening an injection pump, and adjusting the flow of the foam discharging agent to the injection flow required by the gas well by adjusting a liquid phase flow control valve; 4. and dynamically adjusting the filling flow of the foam discharging agent and the nitrogen according to the production condition change of the gas well until all the gas well effusion is discharged.
The invention overcomes the defects of the prior art, provides the underground dosing device for the foam drainage gas production process, can fully mix the foam drainage agent and the accumulated liquid at the bottom of the well, and improves the liquid discharge amount of the foam drainage agent in unit volume. Meanwhile, according to the liquid accumulation degree of the gas well, the stirring strength can be manually controlled by injecting nitrogen into the ground, the foaming agent injection effect is improved, and particularly for the gas well with low gas production rate, the production efficiency and the application range of the foam drainage gas production process can be effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of a downhole dosing device and method for a foam drainage gas production process in the invention;
FIG. 2 is a schematic representation of the construction of the downhole agitator of the present invention.
In the figure: 1. the device comprises a medicine storage tank, 2. An injection pump, 3. A liquid flow meter, 4. A liquid phase flow control valve, 5. A liquid phase check valve, 6. A nitrogen gas source, 7. A compressor, 8. A gas storage tank, 9. A gas flow meter, 10. A gas phase flow control valve, 11. A gas phase check valve, 12. A liquid phase capillary tube, 13. A gas phase capillary tube, 14. A sleeve, 15. An oil pipe, 16. A liquid accumulation liquid level, 17. An underground stirrer, 17-1. A bearing, 17-2. An outer rotating blade, 17-3. A power hole, 17-4. A mixing chamber, 17-5. An inner rotating blade and 17-6. A stirrer barrel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, wherein fig. 1 is a schematic structural diagram of a downhole dosing device and method for a foam drainage gas production process according to the present invention; FIG. 2 is a schematic representation of the construction of the downhole agitator of the present invention.
The invention provides an underground dosing device for a foam drainage gas production process, which mainly comprises a medicine storage tank 1, a liquid phase capillary tube 12, an injection pump 2, a liquid flow meter 3, a liquid phase flow control valve 4, a liquid phase check valve 5, a nitrogen gas source 6, a compressor 7, a gas storage tank 8, a gas phase capillary tube 13, a gas flow meter 9, a gas phase flow control valve 10, a gas phase check valve 11, a sleeve 14, an oil pipe 15 and an underground stirrer 17.
The medicine storage tank 1 is sequentially connected with an injection pump 2, a liquid phase flow control valve 3, a liquid flow meter 4 and a liquid check valve 5 in series by virtue of a liquid phase capillary tube 12 to form a foam discharging agent supply system; the nitrogen gas source 6 is sequentially connected with a compressor 7, a gas storage tank 8, a gas flowmeter 9, a gas phase flow control valve 10 and a gas check valve 11 in series by virtue of a gas phase capillary tube 13 to form a nitrogen gas supply system; the liquid phase capillary 12 and the gas phase capillary 13 are bound together and are lowered into the bottom of the well from the well through an oil pipe 12; the liquid phase capillary 12 is communicated with the gas phase capillary 13 and communicated with the upstream of a bottom stirrer, so that a foam discharging agent and nitrogen form a common channel and are injected into a downhole stirrer 17 together; the underground stirrer 17 mainly comprises a bearing 17-1, an outer rotating blade 17-2, a power hole 17-3, a mixing chamber 17-4, an inner rotating blade 17-5 and a stirrer cylinder 17-6; the gas phase capillary 13 is hermetically connected with the bearing 17-1 through spot welding.
The mixing chamber 17-4 provides a space for the gas-phase capillary 13 to fully mix the foam discharging agent and the nitrogen so as to improve the mixing degree of gas phase and liquid phase; 6 outer rotating blades 17-2 are uniformly connected to the outer side of the stirrer cylinder in a spot welding manner; the number of the inner rotating blades 17-5 is 4, the inner rotating blades are uniformly connected to the inner side of the stirrer cylinder body in a spot welding mode, and the rotating direction of the blades is opposite to that of the outer rotating blades; the number of the power holes 17-3 is 4, and the positions of the power holes correspond to the positions of the inner rotating blades 17-5 in an adaptive mode. The invention relates to an underground dosing method for a foam drainage gas production process, which comprises the following steps: (1) respectively determining the injection flow rates of the foam discharging agent and the nitrogen according to the production conditions such as the pressure difference of an oil jacket of the gas well, the gas production rate and the like; (2) the compressor 6 is opened, and the gas phase flow control valve 10 is adjusted to adjust the nitrogen flow to the filling flow required by the gas well; (3) opening the injection pump 2, and adjusting the flow of the foam discharging agent to the injection flow required by the gas well by adjusting the liquid-phase flow control valve 4; (4) and dynamically adjusting the filling flow of the foam discharging agent and the nitrogen according to the production change condition of the gas well until all the gas well accumulated liquid is discharged.
Compared with the defects and shortcomings of the prior art, the invention has the beneficial effects that:
1) The injection of nitrogen can increase the downhole gas flow of a gas well with low gas production rate, thereby increasing the gas-liquid stirring degree and improving the foaming effect; 2) The mixing chamber can disperse the foam discharging agent by injecting nitrogen, and the mixed fluid of the nitrogen and the foam discharging agent can pass through the power hole at high speed and impact the inner rotating blade under the action of injection pressure, and then the foam discharging agent is uniformly mixed with accumulated liquid at the bottom of the well in a more dispersed manner.
3) The inner rotating blade drives the underground stirrer to rotate under the impact of injected mixed fluid, and the outer rotating blade can fully stir accumulated liquid at the bottom of the well, produced gas, injected foam discharging agent and nitrogen, so that the optimal foaming effect is achieved.
Claims (1)
1. The utility model provides a charge device in pit for foam drainage gas production technology which characterized in that mainly by medicine storage tank, liquid phase capillary, injection pump, liquid phase flow control valve, liquid flowmeter, liquid phase check valve, nitrogen gas source, compressor, gas holder, gaseous phase capillary, gas flowmeter, gaseous phase flow control valve, gaseous phase check valve, oil pipe, sleeve pipe and agitator in the pit, wherein:
the medicine storage tank is sequentially connected with the injection pump, the liquid flowmeter, the liquid phase flow control valve and the liquid check valve in series by virtue of the liquid phase capillary tube to form a foam discharging agent supply system;
the nitrogen gas source is sequentially connected with the compressor, the gas storage tank, the gas flowmeter, the gas phase flow control valve and the gas check valve in series by virtue of the gas phase capillary tube to form a nitrogen gas supply system;
the underground stirrer mainly comprises a bearing, an outer rotating blade, a power hole, a mixing chamber, an inner rotating blade and a stirrer barrel;
the liquid phase capillary and the gas phase capillary are bound together and are lowered to the bottom of the well from the well head through an oil pipe, and the liquid phase capillary is communicated with the gas phase capillary at the upstream of the underground stirrer;
the number of the outer rotating blades is 6, and the outer rotating blades are uniformly connected to the outer side of the underground stirrer cylinder in a spot welding mode;
the number of the power holes is 4, and the positions of the power holes are matched and corresponding to the inner rotating blades;
the number of the inner rotating blades is 4, the inner rotating blades are uniformly connected to the inner side of the stirrer cylinder body in a spot welding mode, and the rotating direction of the blades is opposite to that of the outer rotating blades;
the mixing cavity provides a space for the gas-phase capillary tube to fully mix the foam discharging agent and the nitrogen so as to improve the mixing degree of gas phase and liquid phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810258313.5A CN108386173B (en) | 2018-03-27 | 2018-03-27 | Underground dosing device and method for foam drainage gas production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810258313.5A CN108386173B (en) | 2018-03-27 | 2018-03-27 | Underground dosing device and method for foam drainage gas production process |
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| CN108386173A CN108386173A (en) | 2018-08-10 |
| CN108386173B true CN108386173B (en) | 2022-11-29 |
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| CN112081557B (en) * | 2019-06-12 | 2024-07-30 | 中国石油天然气股份有限公司 | Drainage gas production pipe column |
| CN110259420B (en) * | 2019-06-18 | 2023-12-19 | 东北石油大学 | Can throw and drag for formula foam generator in pit |
| CN114396304B (en) * | 2019-11-11 | 2024-08-20 | 中国矿业大学 | End net type foaming device for transporting gas-liquid two-phase fluid double-layer pipeline |
| CN111021993B (en) * | 2020-01-06 | 2024-08-27 | 中国石油天然气股份有限公司 | Automatic filling device and method for oil-soluble chemical agent |
| CN113323642B (en) * | 2020-02-28 | 2023-10-13 | 中国石油化工股份有限公司 | Gas well effusion on-line diagnosis and foam liquid discharge gas production intelligent injection method |
| CN113503145A (en) * | 2020-06-22 | 2021-10-15 | 承德石油高等专科学校 | Drainage gas production device for natural gas exploitation |
| CN113006753B (en) * | 2021-05-08 | 2023-04-07 | 中国石油天然气股份有限公司 | Method and equipment for filling foam drainage agent and foam drainage ball for equipment |
| CN114233240B (en) * | 2021-12-28 | 2024-01-19 | 四川涪瑞威尔能源技术有限公司 | Integrated waste well ground squeeze injection system |
| CN115788383B (en) * | 2023-02-03 | 2023-06-30 | 陕西万普隆油气技术服务有限公司 | Gas well suction bubble row integrated liquid discharging device |
| CN117664784B (en) * | 2024-01-31 | 2024-04-09 | 西南石油大学 | Dynamic evaluation method for foam discharging agent in time dimension |
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