CN106640031B - Gas extraction and injection separator for same underground well - Google Patents
Gas extraction and injection separator for same underground well Download PDFInfo
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- CN106640031B CN106640031B CN201611072154.7A CN201611072154A CN106640031B CN 106640031 B CN106640031 B CN 106640031B CN 201611072154 A CN201611072154 A CN 201611072154A CN 106640031 B CN106640031 B CN 106640031B
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- 238000002347 injection Methods 0.000 title claims description 7
- 239000007924 injection Substances 0.000 title claims description 7
- 238000000605 extraction Methods 0.000 title description 2
- 239000007788 liquid Substances 0.000 claims abstract description 285
- 238000000926 separation method Methods 0.000 claims abstract description 129
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000003345 natural gas Substances 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Centrifugal Separators (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A gas and liquid separator for underground same-well gas production. The gas-liquid separator is combined with an electric submersible pump, and a top-mounted electric submersible pump drainage gas production lifting system is adopted, so that gas-liquid mixed flow can be separated underground. The method is characterized in that: the gas-liquid separator is also provided with a gas-liquid separation main body, a gas-liquid separation cover and a gas-liquid outer spiral body; the gas-liquid separation main body is positioned in a cavity defined by the upper shell, the liquid inlet shell and the lower shell, and is formed by sequentially connecting an upper transmission shaft of the gas-liquid separation main body, a flow guide section of the gas-liquid separation main body, an inverted cone section of the gas-liquid separation main body and a lower transmission shaft of the gas-liquid separation main body from top to bottom; a guide vane is welded outside the guide section of the gas-liquid separation main body; an air inlet is arranged on the inverted cone section of the gas-liquid separation main body, and the outlet of the air hole channel is positioned in the inner cavity of the upper shell; the gas-liquid separating hood is in a hollow inverted frustum shape, and the gas-liquid outer spiral body is also in a hollow inverted frustum shape.
Description
Technical Field
The invention relates to an underground gas-liquid separation device for oil-submersible electric pump production and injection in the same well, which is applied to the field of natural gas development.
Background
The gas well production process is easy to generate the phenomenon of gas and water co-production, the water production of the gas well can cause liquid accumulation of the gas well, serious damage can be caused to the production of the gas well, and finally the gas well can be stopped producing due to water logging. For the problem of gas well liquid loading, drainage gas production technology is generally adopted. The electric submersible pump drainage gas production lifting system has the advantages of large displacement range, high lift, convenience in management and the like. At present, the separated liquid is discharged to the ground for processing by an electric submersible pump drainage gas production lifting system, a large amount of electric energy is consumed by lifting a large amount of liquid, and meanwhile, the ground water processing investment and the risk of environmental pollution are increased. The same well production and injection technology can realize underground gas-liquid separation and produced water reinjection. However, when the electric submersible pump drainage gas production lifting system is applied to a liquid accumulation gas well with a high gas-liquid ratio, the extreme phenomenon of gas lock can occur due to the influence of free gas contained in well liquid on the lifting capacity of the multistage centrifugal pump.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a gas-liquid separator for underground co-well gas production, which can be applied to liquid-liquid gas wells and is combined with a top-mounted electric submersible pump to realize the separation of gas-liquid mixed flow underground, the separated liquid is injected into an underground reinjection layer, and the separated gas is produced.
The technical scheme of the invention is as follows: the gas and liquid separator for underground co-well production comprises an upper shell, a liquid inlet shell and a lower shell, and is characterized in that: the gas-liquid separator is also provided with a gas-liquid separation main body, a gas-liquid separation cover and a gas-liquid outer spiral body;
the upper shell is provided with a connecting flange and an inner cavity, a central through hole for the upper transmission shaft to pass through is formed in the vertical direction, and an exhaust hole is formed in the upper part of the inner cavity;
the upper part of the liquid inlet shell is provided with a liquid inlet hole, and the liquid inlet shell is connected with the upper shell through a flange; the lower end of the liquid inlet shell is connected with the top end of the lower shell through threads; the bottom end of the lower shell is provided with a lower shell liquid discharging section, the lower shell liquid discharging section is provided with a central through hole for the lower transmission shaft to pass through, and a plurality of lower shell liquid discharging pore channels are formed along the vertical direction;
the gas-liquid separation main body is positioned in a cavity defined by the upper shell, the liquid inlet shell and the lower shell; the gas-liquid separation main body is formed by sequentially connecting an upper transmission shaft of the gas-liquid separation main body, a flow guide section of the gas-liquid separation main body, an inverted cone section of the gas-liquid separation main body and a lower transmission shaft of the gas-liquid separation main body from top to bottom; a guide vane is welded outside the guide section of the gas-liquid separation main body; the transmission shaft on the gas-liquid separation main body is rotatably connected and sealed with the upper shell through a third rolling bearing and a third dynamic sealing structure; and the lower transmission shaft of the gas-liquid separation main body is rotationally connected and sealed with the lower shell through a first rolling bearing and a fourth dynamic sealing structure.
An air inlet is formed in the inverted conical section of the gas-liquid separation main body, an exhaust duct connected with the air inlet vertically penetrates through the inverted conical section of the gas-liquid separation main body and the flow guide section of the gas-liquid separation main body, and an outlet of the exhaust duct is positioned in the inner cavity of the upper shell; and a second dynamic sealing structure is arranged between the gas-liquid separation main body flow guide section and the upper shell.
The gas-liquid separation cover is in a hollow inverted frustum shape, the lower part of the gas-liquid separation cover is provided with a gas-liquid separation cover liquid discharge hole, the gas-liquid separation cover is connected with the lower end of the inverted cone section of the gas-liquid separation main body through threads, the cone angle of the gas-liquid separation cover is larger than that of the inverted cone section of the gas-liquid separation main body, so that an annular space is reserved between the gas-liquid separation cover and the gas-liquid separation cover liquid discharge hole, and the annular space is communicated with the gas-liquid separation cover liquid discharge hole.
The gas-liquid outer spiral body is also in a hollow inverted frustum shape, and the cone angle of the gas-liquid outer spiral body is the same as that of the gas-liquid separation cover; an outer spiral sheet is fixed inside the gas-liquid outer spiral body, and the space in the center of the outer spiral sheet can be just embedded into the inverted cone section of the gas-liquid separation main body and the gas-liquid separation cover; the bottom end of the gas-liquid outer spiral body is provided with a central through hole for a lower transmission shaft to pass through, and the transmission shaft and the bottom end of the gas-liquid outer spiral body are in rotary sealing connection through a first dynamic seal and a second rolling bearing; the bottom end of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral liquid discharge hole, and the middle section of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral shell liquid discharge hole.
The gas-liquid outer spiral body is connected with the lower shell through threads.
The invention has the following beneficial effects: a gas-liquid separation main body transmission shaft of the gas-liquid separator is connected with an electric submersible pump transmission shaft, after an electric submersible pump motor operates, the transmission shaft drives the gas-liquid separator main body transmission shaft to rotate, gas-liquid mixed flow enters the gas-liquid separation main body from a liquid inlet hole of a liquid inlet shell, the mixed flow flows downwards into a gas-liquid external spiral body under the action of a guide vane, the gas-liquid mixed flow generates centrifugal force in the rotating process under the driving of an external spiral piece, gas-liquid two phases with density difference are separated, the gas-liquid two phases are separated under the separation action of a gas-liquid separation cover, gas moves upwards through an exhaust channel hole on an inner shaft at an inverted cone section of the gas-liquid separation main body and is exhausted out of a device body through an exhaust hole of an upper shell, and liquid enters a lower shell cavity through a liquid outlet hole of the gas-liquid external spiral shell. The liquid entering the gas-liquid separation cover is discharged from the liquid discharge hole of the gas-liquid separation cover and the external spiral liquid discharge hole of the gas-liquid under the action of centrifugal force, and moves downwards with other liquid to enter the suction inlet of the submersible electric pump through the liquid discharge hole of the liquid discharge section of the lower shell. The gas-liquid separator can be applied to the same-well production and injection process of water and gas wells, and reduces or even eliminates the influence of gas on the efficacy of the electric submersible pump.
Description of the drawings:
FIG. 1 is a sectional view of the assembly of the gas and liquid separator for gas production from the same well downhole according to the present invention.
FIG. 2 is a schematic diagram of the general assembly of the downhole co-well gas and liquid separator according to the present invention.
Fig. 3 is a schematic view of the assembly of the gas-liquid separation main body, the guide vane and the gas-liquid separation cover according to the present invention.
Fig. 4 is a schematic structural view of the gas-liquid separation main body according to the present invention.
Fig. 5 is a schematic structural view of a guide vane according to the present invention.
FIG. 6 is a schematic view showing the structure of the gas-liquid separation cover according to the present invention.
Fig. 7 is a schematic structural diagram of the liquid inlet housing of the invention.
Fig. 8 is a schematic structural view of the upper case of the present invention.
Fig. 9 is a schematic structural view of the lower case according to the present invention.
FIG. 10 is a schematic structural view of the gas-liquid outer helix of the present invention.
FIG. 11 is a schematic view of the configuration of the gas-liquid external helix casing according to the present invention.
Fig. 12 is a schematic view of the structure of the external spiral sheet according to the present invention.
In the figure, 1-an upper transmission shaft of a gas-liquid separation body, 2-an upper shell, 3-an exhaust hole, 4-a gas-liquid separation body, 5-a liquid inlet hole, 6-a gas-liquid separation body diversion section, 7-a liquid inlet shell, 8-a diversion blade, 9-an exhaust passage hole, 10-a gas-liquid separation body inverted cone section, 11-an outer spiral sheet, 12-a gas-liquid outer spiral body, 13-a gas-liquid separation cover, 14-a gas-liquid separation cover liquid discharge hole, 15-a gas-liquid outer spiral liquid discharge hole, 16-a lower shell, 17-a gas-liquid separation body lower transmission shaft, 18-a fourth dynamic seal, 19-a lower shell liquid discharge section, 20-a lower shell liquid discharge hole, 21-a first rolling bearing, 22-a second rolling bearing, 23-a first dynamic seal, 24-a gas-liquid outer spiral shell liquid discharge hole, 25-a first dynamic seal, 26-a third dynamic seal and 27-a third rolling bearing.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 to 12, the gas and liquid separator for gas production and injection in the same well under the well comprises an upper shell 2, a liquid inlet shell 7 and a lower shell 16, and is characterized in that: the gas-liquid separator also has a gas-liquid separation main body 4, a gas-liquid separation cover 13, and a gas-liquid outer spiral body 12.
The upper shell 2 is provided with a connecting flange plate and an inner cavity, a central through hole for the upper transmission shaft to pass through is vertically formed, and an exhaust hole 3 is formed in the upper part of the inner cavity;
the upper part of the liquid inlet shell 7 is provided with a liquid inlet hole 5, and the liquid inlet shell 7 is connected with the upper shell 2 through a flange; the lower end of the liquid inlet shell 7 is connected with the top end of the lower shell 16 through threads; the lower casing 16 has a lower casing drainage section 19 at its lower end, which is provided with a central through hole for the lower transmission shaft 17 to pass through and a plurality of lower casing drainage channels 20 along the vertical direction.
The gas-liquid separation main body 4 is positioned in a cavity defined by the upper shell 2, the liquid inlet shell 7 and the lower shell 16; the gas-liquid separation main body is formed by sequentially connecting an upper transmission shaft 1 of the gas-liquid separation main body, a flow guide section 6 of the gas-liquid separation main body, an inverted cone section 10 of the gas-liquid separation main body and a lower transmission shaft 17 of the gas-liquid separation main body from top to bottom; a guide vane 8 is welded outside the gas-liquid separation main body guide section 6; the upper transmission shaft 1 of the gas-liquid separation main body is rotationally connected and sealed with the upper shell through a third rolling bearing 27 and a third dynamic sealing structure 26; the gas-liquid separation main body lower transmission shaft 17 is in rotary connection and sealing with the lower shell through a first rolling bearing 21 and a fourth dynamic sealing structure 18.
An air inlet 9 is arranged on the inverted cone section 10 of the gas-liquid separation main body, an air exhaust duct connected with the air inlet vertically penetrates through the inverted cone section of the gas-liquid separation main body and the flow guide section of the gas-liquid separation main body, and an outlet of the air exhaust duct is positioned in the content cavity of the upper shell 2; and a second dynamic sealing structure 25 is arranged between the gas-liquid separation main body flow guide section and the upper shell.
The gas-liquid separation cover 13 is in a hollow inverted frustum shape, the lower part of the gas-liquid separation cover is provided with a gas-liquid separation cover liquid discharge hole 14, the gas-liquid separation cover 13 is connected with the lower end of the inverted cone section 10 of the gas-liquid separation main body through threads, the cone angle of the gas-liquid separation cover 13 is larger than that of the inverted cone section 10 of the gas-liquid separation main body, so that an annular space is reserved between the gas-liquid separation cover and the gas-liquid separation cover liquid discharge hole 14, and the annular space is communicated with the gas-liquid separation cover liquid discharge hole.
The gas-liquid outer spiral body 12 is also in a hollow inverted frustum shape, and the cone angle of the gas-liquid outer spiral body is the same as that of the gas-liquid separation cover; an outer spiral sheet 11 is fixed inside the gas-liquid outer spiral body, and the space in the center of the outer spiral sheet just can be embedded with the inverted cone section of the gas-liquid separation main body and the gas-liquid separation cover; the bottom end of the gas-liquid outer spiral body is provided with a central through hole for the lower transmission shaft 17 to pass through, and the transmission shaft and the bottom end of the gas-liquid outer spiral body are in rotary sealing connection through a first dynamic seal 23 and a second rolling bearing 22; the bottom end of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral liquid discharge hole 15, and the middle section of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral shell liquid discharge hole 24.
The gas-liquid outer spiral body is connected with the lower shell 16 through threads.
The device is provided with the guide vanes on the guide section of the gas-liquid separation main body, so that the gas-liquid mixed flow has certain rotation speed in the downward flowing process; in addition, the device is provided with the gas-liquid outer spiral body, the inverted cone structure of the gas-liquid outer spiral body can ensure that the speed change of gas and liquid is not too large in the downward movement process, the loss of energy of the gas and the liquid is reduced, and the outer spiral body is beneficial to the separation of gas and liquid; the device is provided with the gas-liquid separation cover liquid discharge hole at the lower part of the gas-liquid separation cover, so that liquid entering the gas-liquid separation cover can be discharged from the gas-liquid separation cover liquid discharge hole.
The separator is combined with an electric submersible pump, a top-mounted electric submersible pump drainage gas production lifting system is adopted, gas-liquid mixed flow can be separated underground, separated liquid is injected into an underground reinjection layer, and separated gas is produced. The specific working process is as follows: when the submersible electric pump is started, the electric submersible pump motor operates, the separator body rotates through the transmission shaft, the gas-liquid mixed flow enters the gas-liquid separation body from the liquid inlet hole of the liquid inlet shell, and the gas-liquid mixed flow has a certain rotation speed and flows downwards into the gas-liquid outer spiral body under the action of the guide vanes. Then the gas-liquid mixed flow forms spiral flow under the drive of the outer spiral sheet, the centrifugal force generated by the gas-liquid mixed flow in the rotating process promotes the separation of gas-liquid two phases with density difference, the gas with low density moves to the center, the liquid with high density moves to the outer wall, and the gas-liquid two phases are separated under the separation effect of the gas-liquid separation cover, the gas moves upwards through an exhaust channel hole on the inner shaft in the inverted cone section of the gas-liquid separation main body and is discharged out of the device body through an exhaust hole of the upper shell, and the liquid enters the cavity of the lower shell through a liquid discharge hole of the gas-liquid outer spiral shell, thereby realizing the gas-liquid separation. The liquid entering the gas-liquid separation cover is discharged from the liquid discharge hole of the gas-liquid separation cover and the external spiral liquid discharge hole of the gas-liquid under the action of centrifugal force, and moves downwards with other liquid to enter the suction inlet of the submersible electric pump through the liquid discharge hole of the lower shell of the liquid discharge section of the lower shell.
Claims (1)
1. The utility model provides a gas injection and liquid separation ware is adopted to same well in pit, includes upper housing (2), feed liquor shell (7) and lower shell (16), its characterized in that: the gas-liquid separator is also provided with a gas-liquid separation main body (4), a gas-liquid separation cover (13) and a gas-liquid outer spiral body (12);
wherein, the upper shell (2) is provided with a connecting flange disc and an inner cavity, a central through hole for the upper transmission shaft to pass through is vertically arranged, and the upper part of the inner cavity is provided with an exhaust hole (3);
the upper part of the liquid inlet shell (7) is provided with a liquid inlet hole (5), and the liquid inlet shell (7) is connected with the upper shell (2) through a flange; the lower end of the liquid inlet shell (7) is connected with the top end of the lower shell (16) through threads; the bottom end of the lower shell (16) is provided with a lower shell liquid discharge section (19), the lower shell liquid discharge section is provided with a central through hole for the lower transmission shaft (17) to pass through, and is provided with a plurality of lower shell liquid discharge pore canals (20) along the vertical direction;
the gas-liquid separation main body (4) is positioned in a cavity surrounded by the upper shell (2), the liquid inlet shell (7) and the lower shell (16); the gas-liquid separation main body is formed by sequentially connecting an upper transmission shaft (1) of the gas-liquid separation main body, a flow guide section (6) of the gas-liquid separation main body, an inverted cone section (10) of the gas-liquid separation main body and a lower transmission shaft (17) of the gas-liquid separation main body from top to bottom; a guide vane (8) is welded outside the gas-liquid separation main body guide section (6); the upper transmission shaft (1) of the gas-liquid separation main body is rotatably connected and sealed with the upper shell through a third rolling bearing (27) and a third dynamic sealing structure (26); the lower transmission shaft (17) of the gas-liquid separation main body is rotationally connected and sealed with the lower shell through a first rolling bearing (21) and a fourth dynamic sealing structure (18);
an air inlet (9) is formed in the inverted cone section (10) of the gas-liquid separation main body, an exhaust duct connected with the air inlet vertically penetrates through the inverted cone section of the gas-liquid separation main body and the flow guide section of the gas-liquid separation main body, and an outlet of the exhaust duct is positioned in the content cavity of the upper shell (2); a second dynamic sealing structure (25) is arranged between the gas-liquid separation main body flow guide section and the upper shell;
the gas-liquid separation cover (13) is in a hollow inverted frustum shape, the lower part of the gas-liquid separation cover is provided with a gas-liquid separation cover liquid discharge hole (14), the gas-liquid separation cover (13) is connected with the lower end of the inverted cone section (10) of the gas-liquid separation main body through threads, and the cone angle of the gas-liquid separation cover (13) is larger than that of the inverted cone section (10) of the gas-liquid separation main body, so that an annular space is reserved between the gas-liquid separation cover and the gas-liquid separation cover liquid discharge hole (14), and the annular space is communicated with the gas-liquid separation cover liquid discharge hole (14);
the gas-liquid outer spiral body (12) is also in a hollow inverted frustum shape, and the cone angle of the gas-liquid outer spiral body is the same as that of the gas-liquid separation cover (13); an outer spiral piece (11) is fixed inside the gas-liquid outer spiral body (12), and the space in the center of the outer spiral piece (11) can be just embedded into an inverted cone section (10) of the gas-liquid separation main body and a gas-liquid separation cover (13); the bottom end of the gas-liquid outer spiral body (12) is provided with a central through hole for a lower transmission shaft (17) to pass through, and the lower transmission shaft (17) is in rotary sealing connection with the bottom end of the gas-liquid outer spiral body (12) through a first dynamic seal (23) and a second rolling bearing (22); the bottom end of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral liquid discharge hole (15), and the middle section of the gas-liquid outer spiral body is provided with a gas-liquid outer spiral shell liquid discharge hole (24);
the gas-liquid outer spiral body is connected with the lower shell (16) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611072154.7A CN106640031B (en) | 2016-11-29 | 2016-11-29 | Gas extraction and injection separator for same underground well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611072154.7A CN106640031B (en) | 2016-11-29 | 2016-11-29 | Gas extraction and injection separator for same underground well |
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| CN106640031A CN106640031A (en) | 2017-05-10 |
| CN106640031B true CN106640031B (en) | 2023-02-14 |
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| CN201611072154.7A Active CN106640031B (en) | 2016-11-29 | 2016-11-29 | Gas extraction and injection separator for same underground well |
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| CN107313738B (en) * | 2017-09-06 | 2019-12-20 | 刘书豪 | Fluid separation device, well structure, and method for producing oil or natural gas |
| CN107503712B (en) * | 2017-09-06 | 2020-07-17 | 成都百胜野牛科技有限公司 | Fluid separation device, well structure, and method for producing oil or natural gas |
| CN108317091B (en) * | 2017-12-27 | 2020-01-07 | 中国石油天然气股份有限公司 | Gas-liquid separation device and separation method for submersible electric pump |
| CN110939426B (en) * | 2019-11-19 | 2021-09-28 | 东北石油大学 | Centrifugal separation mechanism and co-well injection and production device using same |
| CN111691866A (en) * | 2020-07-06 | 2020-09-22 | 西安石油大学 | Intelligent underground gas-liquid separation device |
| CN112282676B (en) * | 2020-09-18 | 2022-10-14 | 中国石油大学(华东) | Downhole rotational flow solid-liquid separation drilling speed increasing tool |
| CN112647925B (en) * | 2020-12-21 | 2022-07-08 | 西安石油大学 | Intermittent reciprocating opening and closing liquid drainage nipple |
| CN113187460B (en) * | 2021-04-16 | 2022-04-19 | 东北石油大学 | Shale oil production underground rotational flow gravity coupling driving type gas-liquid separation device |
| CN113006766B (en) * | 2021-04-26 | 2022-07-19 | 东北石油大学 | Be applicable to downhole gas-liquid separation of shale oil pumping unit oil production system |
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