CN111472727A - Oil well associated gas recovery device and associated gas recovery method - Google Patents
Oil well associated gas recovery device and associated gas recovery method Download PDFInfo
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- CN111472727A CN111472727A CN202010311957.3A CN202010311957A CN111472727A CN 111472727 A CN111472727 A CN 111472727A CN 202010311957 A CN202010311957 A CN 202010311957A CN 111472727 A CN111472727 A CN 111472727A
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- valve
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- gas
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- casing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
Abstract
The invention provides an oil well associated gas recovery device, which comprises: the gas-casing pipeline is connected to a gas well casing pipe at a wellhead and is provided with a first valve; the oil outlet pipeline is connected to one side of the upper end of the oil pipe of the wellhead, and a second valve is arranged on the oil outlet pipeline and is a constant-pressure check valve with an opening direction back to the oil pipe; the casing gas inlet pipeline is provided with a third valve, one end of the casing gas inlet pipeline is connected between the first valve and the gas well casing pipe on the casing gas pipeline, the other end of the casing gas inlet pipeline is connected between the oil pipe and the second valve on the oil outlet pipeline, and the third valve is a check valve with an opening direction facing the oil outlet pipeline. The invention also provides an oil well associated gas recovery method which is implemented by adopting the oil well associated gas recovery device.
Description
Technical Field
The invention belongs to the technical field of associated gas recovery, and particularly relates to an oil well associated gas recovery device and an associated gas recovery method.
Background
At present, the development of low permeability oil reservoirs has low single-well liquid amount, oil wells often intermittently discharge liquid, water content rises along with the extension of the exploitation time of the oil wells, associated gas of the oil wells is less and less, and how to effectively recycle the associated gas develops methods such as a constant pressure vent valve, underground oil gas mixed pumping and the like, but the constant pressure vent valve of an oil collecting pipeline cannot be opened due to the insufficient pressure of the associated gas because of small gas amount; the underground oil-gas mixed pumping construction is complex and has the requirement on the sleeve, and the aim of effectively recovering the associated gas cannot be met.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide an oil well associated gas recovery apparatus and associated gas recovery method for overcoming the above problems or at least partially solving or alleviating the above problems.
The invention provides an oil well associated gas recovery device, which comprises:
the gas casing pipeline is connected to a gas well casing of a wellhead, and a first valve is arranged on the gas casing pipeline;
the oil outlet pipeline is connected to one side of the upper end of an oil pipe of a wellhead, a second valve is arranged on the oil outlet pipeline, and the second valve is a constant-pressure check valve with an opening direction back to the oil pipe;
the gas-casing inlet pipeline is provided with a third valve, one end of the gas-casing inlet pipeline is connected to the gas-casing pipeline, the first valve is connected to the gas-casing pipeline, the other end of the gas-casing inlet pipeline is connected to the oil outlet pipeline, the oil pipe is connected to the second valve, and the third valve is a check valve with an opening facing the oil outlet pipeline.
The invention also has the following optional features.
Optionally, the first valve is a gate valve or a constant pressure bleed valve.
Optionally, a fourth valve is arranged on the oil outlet pipeline, and the fourth valve is a gate valve.
Optionally, a fifth valve is arranged on the sleeve gas inlet pipeline, and the fifth valve is a gate valve.
Optionally, the casing gas inlet line includes a first inclined section, a second inclined section and a third inclined section, the first inclined section is connected with the casing gas line, the third inclined section is connected with the oil outlet line, two ends of the second inclined section are connected between the first inclined section and the third inclined section, and one end of the second inclined section connected with the third inclined section is higher than one end of the first inclined section.
Optionally, the third valve is disposed on the third sloped section.
Optionally, the fifth valve is disposed on the first angled section.
The invention also provides an oil well associated gas recovery method, which comprises the following steps:
s001: a casing gas inlet pipeline is connected between a casing gas pipeline and an oil outlet pipeline of the oil well, a check valve with an opening direction facing the oil outlet pipeline is arranged on the casing gas inlet pipeline, and the casing gas inlet pipeline is connected with a polished rod of an oil well pump in the oil pipe through an oil pumping unit for oil extraction;
s002: when the pumping unit drives the polish rod to move downwards, a low-pressure cavity is formed in the oil pipe, so that associated gas in the gas well casing enters the oil outlet pipeline through the casing gas inlet pipeline and the check valve on the casing gas inlet pipeline;
s003: when the pumping unit drives the polish rod to move upwards, the liquid volume in the oil pipe is compressed into high-pressure oil-gas mixture, and the high-pressure oil-gas mixture enters the oil collecting pipeline through a constant-pressure check valve on the oil outlet pipeline
The invention has the beneficial effects that:
according to the oil well associated gas recovery device and the associated gas recovery method, a gas well casing pipe of an oil well wellhead is communicated with an oil outlet pipeline through a gas inlet pipeline and a third valve, when a pumping unit drives a polished rod to move downwards, the liquid amount in an oil pipe is insufficient to form a low-pressure cavity, the associated gas opens the third valve to enter a production oil pipeline and the low-pressure cavity of the oil pipe, when the pumping unit drives the polished rod to move upwards, the liquid amount in the oil pipe is compressed to form a high-pressure oil-gas mixture, and the high-pressure oil-gas mixture opens the second valve on the oil outlet pipeline to enter an oil; therefore, the oil well associated gas is mixed, collected and transported, the recovery rate and the utilization rate of the oil well associated gas are improved, and the purposes of high-quality resource recycling, energy conservation and emission reduction are achieved.
Drawings
Fig. 1 is a schematic view showing the overall configuration of an embodiment of an oil-well associated gas recovery apparatus of the present invention.
In the above figures: 1 set of gas pipeline; 2 gas well casing; 3 a first valve; 4, an oil outlet line; 5, oil pipe; 6 a second valve; 7 sets of gas inlet pipelines; 701 a first inclined section; 702 a second inclined section; 703 a third inclined segment; 8 a third valve; 9 a fourth valve; 10 a fifth valve; 11 a polish rod.
The invention will be further explained in detail with reference to the drawings and the embodiments;
Detailed Description
Example 1
Referring to fig. 1, an embodiment of the present invention provides an oil-well associated gas recovery apparatus, including: the gas-casing pipeline 1 is connected to a gas well casing 2 at a wellhead, and the gas-casing pipeline 1 is provided with a first valve 3; the oil outlet pipeline 4 is connected to one side of the upper end of an oil pipe 5 of a wellhead, a second valve 6 is arranged on the oil outlet pipeline 4, and the second valve 6 is a constant-pressure check valve with an opening direction back to the oil pipe 5; the casing gas inlet pipeline 7 is provided with a third valve 8, one end of the casing gas inlet pipeline 7 is connected between the first valve 3 and the gas well casing 2 on the casing gas pipeline 1, the other end of the casing gas inlet pipeline is connected between the oil pipe 5 and the second valve 6 on the oil outlet pipeline 4, and the third valve 8 is a check valve with an opening direction facing the oil outlet pipeline 4.
When a first valve 3 on the casing gas pipeline 1 is opened, associated gas in a gas well casing 2 enters the casing gas pipeline 1, if the pressure of the associated gas in the gas well casing 2 is insufficient, the first valve 3 needs to be closed, when a polished rod 11 connected with an oil well pump is dragged by the oil pumping unit to move downwards, a low-pressure cavity is formed in an oil pipe 5, and the associated gas enters the low-pressure cavity of the oil pipe through a casing gas inlet pipeline 7 and a second valve 6 serving as a constant-pressure check valve; when the oil pumping unit drags the polish rod 11 connected with the oil well pump to move upwards, the liquid amount in the oil pipe 5 is compressed to form a high-pressure oil-gas mixture, and the high-pressure oil-gas mixture enters the oil collecting pipeline through the oil outlet pipeline 4 and the second valve 6, so that associated gas is recycled.
Example 2
Referring to fig. 1, on the basis of embodiment 1, the first valve 3 is a gate valve or a constant pressure relief valve.
When the first valve 3 is used as a gate valve, the casing gas pipeline 1 is completely closed after the first valve 3 is closed, and the associated gas in the gas well casing 2 can only pass through the casing gas inlet pipeline 7 and the third valve 8; when the first valve 3 is positioned at the constant-pressure gas release valve, and the pressure of the associated gas in the gas well casing 2 is greater than the gas release pressure of the first valve 3, the associated gas can rush the first valve 3 to enter the gas sleeve pipeline 1 to be collected.
Example 3
Referring to fig. 1, in addition to embodiment 1, a fourth valve 9 is provided on the flowline 4, and the fourth valve 9 is a gate valve.
The fourth valve 9 is a gate valve, and when the fourth valve 9 is closed, the downstream pipeline can be maintained, and the oil outlet pipeline 4 can be completely closed after the production of the oil well is stopped.
Example 4
Referring to fig. 1, in embodiment 1, a fifth valve 10 is disposed on the sheath gas inlet line 7, and the fifth valve 10 is a gate valve.
After the fifth valve 10 is closed, the casing gas inlet line 7 can be repaired, and if the oil well no longer recovers oil-associated gas, the fifth valve 10 is closed to completely close the casing gas inlet line 7.
Example 5
Referring to fig. 1, in embodiment 1, the casing gas inlet line 7 includes a first slope section 701, a second slope section 702, and a third slope section 703, the first slope section 701 is connected to the casing gas line 1, the third slope section 703 is connected to the flow line 4, both ends of the second slope section 702 are connected between the first slope section 701 and the third slope section 703, and one end of the second slope section 702 connected to the third slope section 703 is higher than one end of the first slope section 701.
Example 6
Referring to fig. 1, on the basis of embodiment 4, a third valve 8 is provided on the third incline section 703.
The third valve 8 is a check valve with a downward opening, and is arranged on the third inclined section 703 close to the oil outlet pipeline 4, so that liquid pumped out from the oil pipe 5 can be prevented from entering the casing gas inlet pipeline 7, and maintenance of the casing gas inlet pipeline 7 is facilitated.
Example 7
Referring to fig. 1, in embodiment 4, a fifth valve 10 is provided on a first slope section 701.
The fifth valve 10 is a gate valve and is arranged on the first inclined section 701 close to the sleeve gas pipeline 1, and when the sleeve gas inlet pipeline 7 is used at ordinary times, associated gas condensate passes through the fifth valve 10, so that the associated gas condensate is kept lubricated and is not easy to block.
Example 8
The embodiment of the invention provides an oil well associated gas recovery method, which comprises the following steps:
s001: a casing gas inlet pipeline 7 is connected between the casing gas pipeline 1 and the oil outlet pipeline 4 of the oil well, a check valve with an opening direction facing the oil outlet pipeline 4 is arranged on the casing gas inlet pipeline 7, and the casing gas inlet pipeline is connected with a polish rod 11 of an oil well pump in an oil pipe 5 through an oil pumping unit to extract oil;
s002: when the oil pumping unit drives the polished rod 11 to move downwards, a low-pressure cavity is formed in the oil pipe 5, so that associated gas in the gas well casing 2 enters the oil outlet pipeline 4 through the casing gas inlet pipeline 7 and the check valve on the casing gas inlet pipeline 7;
s003: when the pumping unit drives the polish rod 11 to move upwards, the liquid amount in the oil pipe 5 is compressed to form a high-pressure oil-gas mixture, and the high-pressure oil-gas mixture enters the oil collecting pipeline through the constant-pressure check valve on the oil outlet pipeline 4.
In S001, the first valve 3 on the sleeve gas pipeline 1 is normally closed, the fifth valve 10 on the sleeve gas inlet pipeline 7 is normally opened, and the fourth valve 9 on the oil outlet pipeline 4 is normally opened; in S002, the gas pressure in the oil pipe 5 and the oil outlet line 4 between the oil pipe 5 and the second valve 6 is less than the associated gas pressure in the gas well casing 2 and the casing gas inlet line 7, the associated gas pressure pushes the third valve 8 open and enters the oil pipe 5, and at this time, the second valve 6 is closed in one way; in S003, the pressure in the oil pipe 5 and the flow line 4 between the oil pipe 5 and the second valve 6 increases, the third valve 8 is closed in one direction, the second valve 6 is flushed by the high-pressure oil-gas mixture, and the oil-gas mixture enters the oil collecting line.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (7)
1. An oil well associated gas recovery device, comprising:
the gas sleeving pipeline (1), the gas sleeving pipeline (1) is connected to a gas well casing (2) of a wellhead, and a first valve (3) is arranged on the gas sleeving pipeline (1);
the oil outlet pipeline (4) is connected to one side of the upper end of an oil pipe (5) of a wellhead, a second valve (6) is arranged on the oil outlet pipeline (4), and the second valve (6) is a constant-pressure check valve with an opening direction back to the oil pipe (5);
a casing gas inlet pipeline (7), wherein a third valve (8) is arranged on the casing gas inlet pipeline (7), one end of the casing gas inlet pipeline (7) is connected between the first valve (3) and the gas well casing (2) on the casing gas pipeline (1), the other end of the casing gas inlet pipeline is connected between the oil pipe (5) and the second valve (6) on the oil outlet pipeline (4), and the third valve (8) is a check valve with an opening direction facing the oil outlet pipeline (4); a fifth valve (10) is arranged on the sleeve gas inlet pipeline (7), and the fifth valve (10) is a gate valve.
2. The oil-well associated gas recovery device according to claim 1, wherein the first valve (3) is a gate valve or a constant pressure vent valve.
3. An oil associated gas recovery device according to claim 1, wherein a fourth valve (9) is arranged on the oil outlet pipeline (4), and the fourth valve (9) is a gate valve.
4. The oilfield associated gas recovery apparatus according to claim 1, wherein the casing gas inlet line (7) comprises a first slanted section (701), a second slanted section (702), and a third slanted section (703), the first slanted section (701) is connected to the casing gas line (1), the third slanted section (703) is connected to the flowline (4), both ends of the second slanted section (702) are connected between the first slanted section (701) and the third slanted section (703), and one end of the second slanted section (702) connected to the third slanted section (703) is higher than one end of the first slanted section (701).
5. An oil well associated gas recovery device according to claim 1, wherein said third valve (8) is arranged on said third slanted section (703).
6. An oil well associated gas recovery device according to claim 1, wherein said fifth valve (10) is provided on said first inclined section (701).
7. An oil well associated gas recovery method is characterized by comprising the following steps:
s001: a casing gas inlet pipeline is connected between a casing gas pipeline and an oil outlet pipeline of the oil well, a check valve with an opening direction facing the oil outlet pipeline is arranged on the casing gas inlet pipeline, and the casing gas inlet pipeline is connected with a polished rod of an oil well pump in the oil pipe through an oil pumping unit for oil extraction;
s002: when the pumping unit drives the polish rod to move downwards, a low-pressure cavity is formed in the oil pipe, so that associated gas in the gas well casing enters the oil outlet pipeline through the casing gas inlet pipeline and the check valve on the casing gas inlet pipeline;
s003: when the pumping unit drives the polish rod to move upwards, the liquid volume in the oil pipe is compressed into a high-pressure oil-gas mixture, and the high-pressure oil-gas mixture enters the oil collecting pipeline through a constant-pressure check valve on the oil outlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311957.3A CN111472727A (en) | 2020-04-20 | 2020-04-20 | Oil well associated gas recovery device and associated gas recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311957.3A CN111472727A (en) | 2020-04-20 | 2020-04-20 | Oil well associated gas recovery device and associated gas recovery method |
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| CN111472727A true CN111472727A (en) | 2020-07-31 |
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| CN202010311957.3A Pending CN111472727A (en) | 2020-04-20 | 2020-04-20 | Oil well associated gas recovery device and associated gas recovery method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622870A (en) * | 2020-12-09 | 2022-06-14 | 中国石油天然气股份有限公司 | Associated gas recovery device and recovery method |
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| CN101705805A (en) * | 2009-11-06 | 2010-05-12 | 田茂文 | Well-head shutoff pressure prevention and casting head gas recovery integrated device |
| CN202360063U (en) * | 2011-11-10 | 2012-08-01 | 龚淑霞 | Automatic degassing and recovering device for oil well casing |
| RU2547185C1 (en) * | 2014-01-09 | 2015-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный нефтегазовый университет" (ТюмГНГУ) | Wellhead connections of high-output oil well with annular gas show |
| CN206957625U (en) * | 2017-06-05 | 2018-02-02 | 中国石油天然气股份有限公司 | A kind of wellhead tree system |
| CN110513087A (en) * | 2019-07-18 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of well head pressure difference companion gas recovery system |
| CN212837709U (en) * | 2020-04-20 | 2021-03-30 | 中国石油天然气股份有限公司 | Oil well associated gas recovery device |
-
2020
- 2020-04-20 CN CN202010311957.3A patent/CN111472727A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705805A (en) * | 2009-11-06 | 2010-05-12 | 田茂文 | Well-head shutoff pressure prevention and casting head gas recovery integrated device |
| CN202360063U (en) * | 2011-11-10 | 2012-08-01 | 龚淑霞 | Automatic degassing and recovering device for oil well casing |
| RU2547185C1 (en) * | 2014-01-09 | 2015-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный нефтегазовый университет" (ТюмГНГУ) | Wellhead connections of high-output oil well with annular gas show |
| CN206957625U (en) * | 2017-06-05 | 2018-02-02 | 中国石油天然气股份有限公司 | A kind of wellhead tree system |
| CN110513087A (en) * | 2019-07-18 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of well head pressure difference companion gas recovery system |
| CN212837709U (en) * | 2020-04-20 | 2021-03-30 | 中国石油天然气股份有限公司 | Oil well associated gas recovery device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622870A (en) * | 2020-12-09 | 2022-06-14 | 中国石油天然气股份有限公司 | Associated gas recovery device and recovery method |
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