CN112459748A - Single-point high-pressure gas lift drainage and gas increase process system and method - Google Patents
Single-point high-pressure gas lift drainage and gas increase process system and method Download PDFInfo
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- CN112459748A CN112459748A CN202011224332.XA CN202011224332A CN112459748A CN 112459748 A CN112459748 A CN 112459748A CN 202011224332 A CN202011224332 A CN 202011224332A CN 112459748 A CN112459748 A CN 112459748A
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
- E21B43/123—Gas lift valves
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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
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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
- E21B43/40—Separation associated with re-injection of separated materials
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Abstract
The invention provides a single-point high-pressure gas lift drainage and gas increase process system and a single-point high-pressure gas lift drainage and gas increase method. The gas-water independent gas production system is suitable for unconventional reservoirs such as compact oil, compact gas and shale gas containing water at the same layer or the bottom of the gas-water independent reservoir, a gas source does not need to be searched, the gas source is self-supplied, the gas source is pressurized and then is injected back into a shaft, a liquid phase is treated and then is discharged or recycled, after multiple cycles, the water yield of a target well is reduced, and when the liquid amount in an oil pipe is smaller than the critical liquid carrying flow, the system is closed, and the independent gas production capacity. Automatic control is realized through the control system, and waste caused by continuous injection of high-pressure gas after liquid in the gas well is completely discharged is avoided. Compared with the nitrogen gas lift process, the gas source is supplied, and the cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of natural gas exploitation of oil and gas fields, and particularly relates to a single-point high-pressure gas lift drainage and gas increase process system and a single-point high-pressure gas lift drainage and gas increase method.
Background
At the initial stage of production of the oil-gas well, the pressure of natural gas in a shaft of the oil-gas well is high, the flow rate is high, a large amount of condensate oil and water in the shaft are carried to the well by the natural gas, and under the action of high pressure at a well head, the natural gas carries the condensate oil and the water to enter a gathering and transporting pipeline to be transported to a gas gathering station; at the last stage of production of the oil and gas well, the formation pressure is reduced to enable the pressure of natural gas in a shaft of the oil and gas well to be low and the flow rate to be low, the capacity of gas in the shaft of the oil and gas well to carry underground condensate oil and water is gradually reduced, a part of condensate oil and water in the shaft is carried to the well by the natural gas, the condensate oil and water carried to the well by the natural gas generate pipeline resistance in a gathering and transporting pipeline, the transportation capacity of the transporting pipeline to a gas collecting station is reduced, the natural gas flow rate in the shaft of the oil and gas well is further reduced, the other part of condensate oil and water is deposited in a vertical shaft to form accumulated liquid, the accumulated liquid is gradually increased in the shaft to enable the pressure of an oil and gas well head to be continuously reduced to form a low-yield well, when the pressure of the oil and gas well head is lower than the pressure of the gathering and transporting pipeline.
Particularly, after hydraulic fracturing of a water-containing reservoir is finished, a large amount of liquid in a shaft cannot be discharged due to the fact that the water yield of a part of wells is large and is higher than the critical liquid carrying flow of a gas well, and the yield of natural gas is reduced.
In order to improve the liquid drainage capability of a liquid-containing low-yield oil-gas well, the current liquid drainage and gas production modes are mainly divided into a chemical injection method, a mechanical drainage and gas production method and a gas lift method. The chemical injection method is to inject a chemical foaming agent into a well to generate low-density foam at the bottom of the well to realize liquid drainage, but has the problems of high treatment cost of returned liquid, serious environmental pollution and poor adaptability to oil-gas-containing wells and high-temperature deep wells; mechanical drainage and production methods comprise mechanical pumping, electric submersible pumps and the like, but the methods have the problems of large influence by gas, easy air lock in high gas-liquid ratio environment, low efficiency and the like in a gas well; the gas lift method is to inject high-pressure gas into the ground, increase the underground gas volume, improve the liquid carrying capacity and realize liquid drainage and gas production, but for a liquid accumulation well with insufficient pressure, the gas lift method has the problems of high gas injection pressure, limitation of formation fluid production, incapability of producing the gas well to exhaustion and the like, and has high requirements on gas sources.
The existing nitrogen gas lift process has high cost and low continuity, and the plunger water drainage and gas recovery process needs a target well to have corresponding gas production rate to discharge the accumulated liquid in the shaft. The nitrogen gas lift is 4000 yuan per hour, the average gas lift is 30 hours per well, the total gas lift is 120000 yuan, and the cost is high. And the nitrogen gas lift is mainly adopted when the liquid effusion is serious, and is not applied in the whole liquid discharge process, so that the liquid discharge is discontinuous, the liquid cannot be discharged in time, and the yield is influenced.
Disclosure of Invention
The invention aims to provide a single-point high-pressure gas lift drainage and gas increase process system, which overcomes the technical problems in the prior art.
The invention also aims to provide a single-point high-pressure gas lift drainage and gas increase process method, which achieves the autonomous gas production capacity after multiple cycles.
Therefore, the technical scheme provided by the invention is as follows:
the utility model provides a single-point high pressure gas lift drainage gas boosting process systems, includes casing valve, oil pipe valve and unloading or annotate the liquid valve, the oil pipe valve has the three-phase separator through the pipeline intercommunication, the gaseous phase export of three-phase separator has the compressor through the pipeline intercommunication, the compressor passes through pipeline and casing valve and sleeve pipe intercommunication.
The system comprises a three-phase separator, a control system, a first electromagnetic valve, a second electromagnetic valve and a flowmeter, wherein the first electromagnetic valve is arranged on a pipeline between a tubing valve and the three-phase separator, the second electromagnetic valve is arranged on a pipeline between the tubing valve and a production process, the flowmeter is arranged on a liquid phase outlet pipeline of the three-phase separator, and the first electromagnetic valve, the second electromagnetic valve and the flowmeter are all electrically connected with the control system;
the control system is used for receiving the flow signal of the flowmeter, comparing the flow signal with the critical liquid carrying flow of the gas well and then controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve.
The sleeve valve comprises a sleeve valve I and a sleeve valve II which are arranged in parallel, the sleeve valve I is connected with a sleeve valve III in series, the sleeve valve II is connected with a sleeve valve IV in series, and the compressor is communicated with the sleeve valve I or the sleeve valve II through a pipeline;
the oil pipe valve comprises an inner oil pipe valve and two oil pipe outlet valves, the inner oil pipe valves are respectively an inner oil pipe valve I and an inner oil pipe valve II, the inner oil pipe valve I and the inner oil pipe valve II are connected on an oil pipe in the sleeve in series, the oil pipe outlet valves comprise an oil pipe outlet valve III and an oil pipe outlet valve IV which are arranged in parallel, the oil pipe outlet valve III is connected with an oil pipe outlet valve V in series, the oil pipe outlet valve IV is connected with an oil pipe outlet valve VI in series, the three-phase separator is communicated with the oil pipe outlet valve III, the oil pipe outlet valve V or the oil pipe outlet valve IV and the oil pipe outlet valve VI through pipelines, and the emptying valve or the liquid inlet valve and the oil pipe outlet valve are arranged in parallel.
And a liquid phase outlet of the three-phase separator is communicated with a liquid storage tank, and an outlet pipeline of the production process is communicated with the liquid storage tank.
A single-point high-pressure gas lift drainage and gas increase process method uses a single-point high-pressure gas lift drainage and gas increase process system, and comprises the following steps:
step 1) opening a first electromagnetic valve, closing a second electromagnetic valve, and extracting gas and liquid from an oil pipe, wherein the gas and liquid enter a three-phase separator after passing through an oil pipe valve;
step 2) separating the extracted gas and liquid by a three-phase separator, detecting the separated liquid by a flowmeter, sending the liquid phase flow to a control system by the flowmeter, comparing the liquid phase flow with the gas well critical liquid carrying flow by the control system, keeping a magnetic valve I open and a magnetic valve II closed when the liquid phase flow is larger than the gas well critical liquid carrying flow, treating the separated liquid and then entering a liquid storage tank, and boosting the separated gas by a compressor;
step 3) enabling the gas after pressure boosting to enter a casing from a casing valve and reinjecting the gas into a shaft;
and 4) repeating the steps 1) to 3), and controlling the first electromagnetic valve to be closed and the second electromagnetic valve to be opened to go through the production process when the flow of the liquid phase detected by the flow meter is less than the critical liquid carrying flow in a circulating reciprocating mode, so that the gas well enters the autonomous gas production process.
The separated gas enters a compressor to be pressurized to 15-25 MPa.
The liquid separated by the three-phase separator firstly enters a combustion tank, then the pH of the liquid is adjusted to 7-8, a treatment agent is added, no impurity is generated after precipitation and filtration, and the liquid is pumped to a liquid storage tank 9 for standby.
The critical liquid carrying flow rate is obtained by the following formula:
in the formula (I), the compound is shown in the specification,q c critical liquid carrying flow rate, m3D; p is bottom hole pressure, MPa; a is the cross-sectional area of the oil pipe, m2；
Is the critical liquid carrying flow velocity, m/s; t is temperature, K; z is natural gas compression factor without dimension.
And 4), the flow meter sends the liquid phase flow to the control system, the control system compares the liquid phase flow with the gas well critical liquid carrying flow, and when the liquid phase flow is smaller than the well critical liquid carrying flow, the control system sends a signal to the electromagnetic valve to close the electromagnetic valve.
The treatment agent comprises an oxidant, a flocculating agent, a coagulant aid and a bactericide, and the dosage for treating the liquid of each formula is as follows: 1-2kg of oxidant, 2-10kg of flocculant, 1-3kg of coagulant aid and 0.05-0.1 kg of bactericide;
the flocculant is one of polyaluminium chloride, basic aluminum sulfate and ferrous sulfate, and the coagulant aid is polyacrylamide; the bactericide is dodecyl dimethyl benzyl ammonium chloride.
The invention has the beneficial effects that:
the single-point high-pressure gas lift drainage gas-increasing process system provided by the invention is suitable for unconventional reservoirs such as compact oil, compact gas and shale gas containing water at the same layer of gas and water or at the bottom of the reservoir, and the like, and does not need to search for a gas source, the gas source is supplied by itself, the gas source is pressurized and then injected back into a shaft, a liquid phase is treated and then discharged or recycled, after multiple cycles, the water yield of a target well is reduced, and when the liquid amount in an oil pipe is smaller than the critical liquid carrying flow, the system is closed, and the gas production capacity can be.
Realize gas-water separation through three-phase separator, prevent the pit shaft hydrops. The liquid phase (flowback liquid) separated by the three-phase separator is subjected to flocculation sedimentation, solid-liquid separation and filtration clarification, the purposes of reutilization, standard discharge and stratum reinjection in oilfield on-site fracturing construction can be met, the operation of dredging a slurry pool is reduced, the land is saved, and the environment is protected.
The automatic control is realized through the control system, the whole system is closed after the gas well realizes the autonomous gas production capacity, the phenomenon that high-pressure gas is still continuously injected after liquid in the gas well is completely discharged to cause idling of the gas lift system to cause waste is avoided, and the working efficiency of the gas lift system is ensured. Compared with the nitrogen gas lift process, the gas source is supplied, and the cost is greatly reduced.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention.
In the figure:
description of reference numerals:
1. a first inner oil pipe valve; 2. a sleeve valve I; 3. a sleeve valve II, a sleeve valve 4 and an inner oil pipe valve II; 5. a sleeve valve III; 6. a sleeve valve IV; 7. an emptying or liquid inlet valve; 8. an oil pipe outlet valve III; 9. an oil pipe outlet valve IV; 10. an oil pipe outlet valve V; 11. an oil pipe outlet valve VI; 12. a three-phase separator; 13. a flow meter; 14. a liquid storage tank; 15. a tank truck; 16. a compressor; 17. a compressor outlet valve; 18. an oil pipe; 19. a ground surface; 20. a first electromagnetic valve; 21. a second electromagnetic valve; 22. a production flow; 23. and (5) controlling the system.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the single-point high-pressure gas lift water drainage and gas enhancement process system described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a single-point high-pressure gas lift drainage and gas increase process system, including sleeve valve, oil pipe valve and unloading or notes liquid valve, the oil pipe valve has three-phase separator 12 through the pipeline intercommunication, the gaseous phase export of three-phase separator 12 has compressor 16 through the pipeline intercommunication, compressor 16 passes through pipeline and sleeve valve and sleeve pipe intercommunication.
The invention is suitable for unconventional reservoirs such as compact oil, compact gas and shale gas containing water at the same layer or the bottom of the gas-water layer. Wherein a single point refers to the process of lifting fluid from tubing 18 by tubing 18 shoes (the bottom most portion of tubing 18).
Condensate oil and water are inevitably existed in the underground of the oil-gas well, the production process is in a gas-liquid two-phase flow form, and particularly for a water-containing reservoir, after hydraulic fracturing is finished, a large amount of liquid in a shaft cannot be discharged due to the fact that the water yield of part of wells is large and is higher than the critical liquid carrying flow of a gas well, and the yield of natural gas is reduced.
Specifically, the working process or the application process of the single-point high-pressure gas lift drainage and gas increase process system provided by the embodiment is as follows:
liquid is lifted out of oil pipe 18 through oil pipe 18 shoes, produced gas and liquid are separated through three-phase separator 12, the liquid is recycled after being treated, the gas is pumped back to a shaft through a casing after being boosted through compressor 16, and the gas is produced by being carried by oil pipe 18 and circulates to and fro, so that the self-gas production capacity of the well is achieved.
Example 2:
on the basis of the embodiment 1, the embodiment provides a single-point high-pressure gas lift water drainage and gas increasing process system,
the system further comprises a control system, a first electromagnetic valve 20, a second electromagnetic valve 21 and a flowmeter 13, wherein the first electromagnetic valve 20 is arranged on a pipeline between the oil pipe valve and the three-phase separator 12, the second electromagnetic valve 21 is arranged on a pipeline between the oil pipe valve and the production process 22, the flowmeter 13 is arranged on a liquid phase outlet pipeline of the three-phase separator 12, and the first electromagnetic valve 20, the second electromagnetic valve 21 and the flowmeter 13 are all electrically connected with the control system 23;
and the control system 23 is used for receiving the flow signal of the flowmeter 13, comparing the flow signal with the gas well critical liquid carrying flow, and controlling the opening and closing of the first electromagnetic valve 20 and the second electromagnetic valve 21.
The automatic control is realized through the control system, the whole system is closed after the gas well realizes the autonomous gas production capacity, the phenomenon that high-pressure gas is still continuously injected after liquid in the gas well is completely discharged to cause idling of the gas lift system to cause waste is avoided, and the working efficiency of the gas lift system is ensured. Compared with the nitrogen gas lift process, the gas source is supplied, and the cost is greatly reduced.
Example 3:
on the basis of the embodiment 1, the embodiment provides a single-point high-pressure gas lift water drainage and gas increasing process system,
the sleeve valve comprises a sleeve valve I2 and a sleeve valve II 3 which are arranged in parallel, the sleeve valve I2 is connected with a sleeve valve III 5 in series, the sleeve valve II 3 is connected with a sleeve valve IV 6 in series, and the compressor 16 is communicated with the sleeve valve I2 or the sleeve valve II 3 through a pipeline;
the oil pipe valve comprises an inner oil pipe valve and two oil pipe outlet valves, the two inner oil pipe valves are respectively an inner oil pipe valve I1 and an inner oil pipe valve II 4, the inner oil pipe valve I1 and the inner oil pipe valve II 4 are connected in series on an oil pipe 18 in the sleeve, the oil pipe outlet valves comprise an oil pipe outlet valve III 8 and an oil pipe outlet valve IV 9 which are arranged in parallel, the oil pipe outlet valve III 8 is connected in series with an oil pipe outlet valve V10, the oil pipe outlet valve IV 9 is connected in series with an oil pipe outlet valve VI 11, the three-phase separator 12 is communicated with the oil pipe outlet valve III 8, the oil pipe outlet valve V10 or the oil pipe outlet valve IV 9 and the oil pipe outlet valve VI 11 through pipelines, and the emptying or liquid inlet valve 7 is arranged in parallel with the oil pipe outlet valve. As shown in fig. 1.
The three casing valves 5, the first pipe valves 2, the second casing valves 3 and the fourth casing valves 6 are mutually standby, the three oil pipe outlet valves 8, the five oil pipe outlet valves 10 or the four oil pipe outlet valves 9 and the six oil pipe outlet valves 11 are mutually standby, and the two inner oil pipe valves are mutually standby. The emptying or inlet valve 7 is used for injecting fracturing fluid when the oil pipe 18 is emptied or fractured. All valves are located above ground 19.
In the present embodiment, the liquid phase outlet of the three-phase separator 12 is communicated with the liquid storage tank 14, and the outlet pipeline of the production process 22 is communicated with the liquid storage tank 14.
The working process is as follows:
1) closing a sleeve valve II 3, a sleeve valve IV 6, an oil pipe outlet valve IV 9, an oil pipe outlet valve VI 11 and an emptying or injection valve 7, opening a sleeve valve III 5, a pipe valve I2, two inner oil pipe valves (respectively an inner oil pipe valve I1 and an inner oil pipe valve II 4), an oil pipe outlet valve III 8 and an oil pipe outlet valve V10, extracting gas and liquid from an oil pipe 18, and allowing the gas and liquid to enter a three-phase separator 12;
2) the produced gas and liquid are separated by a three-phase separator 12, the liquid enters a liquid storage tank 14, and the gas enters a compressor 16 for boosting;
3) the boosted gas enters a casing from a casing valve III 5 and a pipe valve I2, is reinjected into a shaft and is carried by an oil pipe 18 for extraction, and the steps are repeated to circulate;
4) when the liquid amount in the oil pipe 18 is smaller than the critical liquid carrying flow, the control system compares the liquid phase flow sent by the flowmeter 13 with the gas well critical liquid carrying flow, and sends a signal to the electromagnetic valve 20 to close the electromagnetic valve 20, so that the autonomous production flow is carried out, and the gas well achieves the autonomous gas production capacity.
The automatic control is realized through the control system, the whole system is closed after the gas well realizes the autonomous gas production capacity, the phenomenon that high-pressure gas is still continuously injected after liquid in the gas well is completely discharged to cause idling of the gas lift system to cause waste is avoided, and the working efficiency of the gas lift system is ensured. Compared with the nitrogen gas lift process, the gas source is supplied, and the cost is greatly reduced.
Example 4:
the embodiment provides a single-point high-pressure gas lift drainage and gas increase process method, which uses a single-point high-pressure gas lift drainage and gas increase process system and comprises the following steps:
step 1), opening a first electromagnetic valve 20, closing a second electromagnetic valve 21, and extracting gas and liquid from an oil pipe 18 to enter a three-phase separator 12 after passing through an oil pipe valve;
step 2) the three-phase separator 12 separates the extracted gas and liquid, the separated liquid is detected through a flow meter 13, the flow meter 13 sends the liquid phase flow to a control system 23, the control system 23 compares the liquid phase flow with the gas well critical liquid carrying flow, when the liquid phase flow is larger than the gas well critical liquid carrying flow, a magnetic valve I20 is kept open and a magnetic valve II 21 is kept closed, the separated liquid enters a liquid storage tank 14 after being processed, and the separated gas enters a compressor 10 for boosting;
step 3) enabling the gas after pressure boosting to enter a casing from a casing valve and reinjecting the gas into a shaft;
and 4) repeating the steps 1) and 3), circularly reciprocating until the flow meter 13 detects that the liquid phase flow is less than the critical liquid carrying flow, controlling the first electromagnetic valve 20 to close, opening the second electromagnetic valve 21 to go away from the production flow 22, and enabling the gas well to enter an autonomous gas production flow.
Wherein, the gas separated by the three-phase separator 12 enters a compressor 16 to be pressurized to 15-25 MPa.
Example 5:
on the basis of the embodiment 4, the embodiment provides a single-point high-pressure gas lift water drainage and gas increasing process method, liquid separated by a three-phase separator 12 firstly enters a combustion tank, then the pH value of the liquid is adjusted to 7-8, a treatment agent is added, no impurities exist after precipitation and filtration, and the liquid is pumped to a liquid storage tank 14 for standby.
The treatment agent comprises an oxidant, a flocculating agent, a coagulant aid and a bactericide, and the dosage for treating the liquid of each formula is as follows: 1-2kg of oxidant, 2-10kg of flocculant, 1-3kg of coagulant aid and 0.05-0.1 kg of bactericide;
the flocculant is one of polyaluminium chloride, basic aluminum sulfate and ferrous sulfate, and the coagulant aid is polyacrylamide; the bactericide is dodecyl dimethyl benzyl ammonium chloride.
Realize gas-water separation through three-phase separator 12, prevent the pit shaft hydrops. The liquid phase (flowback liquid) separated by the three-phase separator 12 is subjected to flocculation sedimentation, solid-liquid separation and filtration clarification, the purposes of reutilization, standard discharge and stratum reinjection in oilfield on-site fracturing construction can be met, the operation of a slurry digging pool is reduced, the land is saved, and the environment is protected.
Example 6:
on the basis of embodiment 4, the embodiment provides a single-point high-pressure gas lift drainage and gas increase process method,
the critical liquid carrying flow rate is obtained by the following formula:
in the formula (I), the compound is shown in the specification,q c critical liquid carrying flow rate, m3D; p is bottom hole pressure, MPa; a is the cross-sectional area of oil pipe 18, m2；
Is the critical liquid carrying flow velocity, m/s; t is temperature, K; z is natural gas compression factor without dimension.
In the step 4), the flowmeter 13 sends the liquid phase flow rate to the control system 23, the control system 23 compares the liquid phase flow rate with the gas well critical liquid carrying flow rate, and when the liquid phase flow rate is smaller than the well critical liquid carrying flow rate, the control system sends a signal to the electromagnetic valve 20 to close the electromagnetic valve 20.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A single-point high-pressure gas lift drainage and gas increase process system is characterized in that: the device comprises a sleeve valve, an oil pipe valve and an emptying or gas injection valve, wherein the oil pipe valve is communicated with a three-phase separator (12) through a pipeline, a gas phase outlet of the three-phase separator (12) is communicated with a compressor (16) through a pipeline, and the compressor (16) is communicated with a sleeve through a pipeline and a sleeve valve.
2. The single-point high-pressure gas lift water drainage and gas enhancement process system according to claim 1, characterized in that: the oil pipe separator is characterized by further comprising a control system (23), a first electromagnetic valve (20), a second electromagnetic valve (21) and a flowmeter (13), wherein the first electromagnetic valve (20) is arranged on a pipeline between the oil pipe valve and the three-phase separator (12), the second electromagnetic valve (21) is arranged on a pipeline between the oil pipe valve and the production process (22), the flowmeter (13) is arranged on a liquid-phase outlet pipeline of the three-phase separator (12), and the first electromagnetic valve (20), the second electromagnetic valve (21) and the flowmeter (13) are all electrically connected with the control system (23);
and the control system (23) is used for receiving the flow signal of the flowmeter (13), comparing the flow signal with the gas well critical liquid carrying flow, and controlling the opening and closing of the first electromagnetic valve (20) and the second electromagnetic valve (21).
3. The single-point high-pressure gas lift water drainage and gas enhancement process system according to claim 1, characterized in that: the sleeve valve comprises a first sleeve valve (2) and a second sleeve valve (3) which are arranged in parallel, the first sleeve valve (2) is connected with a third sleeve valve (5) in series, the second sleeve valve (3) is connected with a fourth sleeve valve (6) in series, and the compressor (16) is communicated with the first sleeve valve (2) or the second sleeve valve (3) through a pipeline;
the oil pipe valve comprises an inner oil pipe valve and an oil pipe outlet valve, the number of the inner oil pipe valves is two, the two inner oil pipe valves are respectively an inner oil pipe valve I (1) and an inner oil pipe valve II (4), the inner oil pipe valve I (1) and the inner oil pipe valve II (4) are connected in series on the oil pipe (18) in the sleeve, the oil pipe outlet valve comprises an oil pipe outlet valve III (8) and an oil pipe outlet valve IV (9) which are arranged in parallel, the oil pipe outlet valve III (8) is connected with an oil pipe outlet valve V (10) in series, the oil pipe outlet valve IV (9) is connected with an oil pipe outlet valve VI (11) in series, the three-phase separator (12) is communicated with an oil pipe outlet valve III (8), an oil pipe outlet valve V (10) or an oil pipe outlet valve IV (9) and an oil pipe outlet valve VI (11) through pipelines, and the emptying valve or the liquid inlet valve (7) is arranged in parallel with the oil pipe outlet valve.
4. The single-point high-pressure gas lift water drainage and gas enhancement process system according to claim 2, characterized in that: the liquid phase outlet of the three-phase separator (12) is communicated with a liquid storage tank (14), and the outlet pipeline of the production process (22) is communicated with the liquid storage tank (14).
5. A single-point high-pressure gas lift drainage and gas increase process method using the single-point high-pressure gas lift drainage and gas increase process system of claim 2, characterized by comprising the following steps:
step 1), opening a first electromagnetic valve (20), closing a second electromagnetic valve (21), extracting gas and liquid from an oil pipe (18), and enabling the gas and liquid to enter a three-phase separator (12) after passing through an oil pipe valve;
step 2) separating the extracted gas and liquid by a three-phase separator (12), detecting the separated liquid by a flowmeter (13), sending the liquid phase flow to a control system (23) by the flowmeter (13), comparing the liquid phase flow with the gas well critical liquid carrying flow by the control system (23), keeping a magnetic valve I (20) open and a magnetic valve II (21) closed when the liquid phase flow is greater than the gas well critical liquid carrying flow, treating the separated liquid and then entering a liquid storage tank (14), and boosting the separated gas by a compressor (10);
step 3) enabling the gas after pressure boosting to enter a casing from a casing valve and reinjecting the gas into a shaft;
and 4) repeating the steps 1) to 3), and controlling the first electromagnetic valve (20) to be closed, the second electromagnetic valve (21) to be opened to go away from the production flow (22) when the flow meter (13) detects that the liquid phase flow is smaller than the critical liquid carrying flow in a circulating reciprocating mode, so that the gas well enters an autonomous gas production flow.
6. The single-point high-pressure gas lift water drainage and gas increasing process method according to claim 5, characterized in that: the separated gas enters a compressor (16) to be pressurized to 15-25 MPa.
7. The single-point high-pressure gas lift water drainage and gas increasing process method according to claim 5, characterized in that: the liquid separated by the three-phase separator (12) firstly enters a combustion pool, then the pH of the liquid is adjusted to 7-8, and the liquid is added with a treatment medicament, precipitated and filtered without impurities and pumped to a liquid storage tank (14) for standby or haulage.
8. The single-point high-pressure gas lift water drainage and gas increasing process method according to claim 5, characterized in that: the critical liquid carrying flow rate is obtained by the following formula:
in the formula (I), the compound is shown in the specification,q c critical liquid carrying flow rate, m3D; p is bottom hole pressure, MPa; a is the cross-sectional area of the oil pipe, m2；
Is the critical liquid carrying flow velocity, m/s; t is temperature, K; z is natural gas compression factor without dimension.
9. The single-point high-pressure gas lift water drainage and gas increasing process method according to claim 5, characterized in that: in the step 4), the flowmeter (13) sends liquid phase flow data to the control system (23) in real time, and when the liquid phase flow is smaller than the critical liquid carrying flow of the gas well, the control system (23) controls the first electromagnetic valve (20) to be closed and the second electromagnetic valve (21) to be opened.
10. The single-point high-pressure gas lift water drainage and gas increasing process method according to claim 5, characterized in that: the treatment agent comprises an oxidant, a flocculating agent, a coagulant aid and a bactericide, and the dosage for treating the liquid of each formula is as follows: 1-2kg of oxidant, 2-10kg of flocculant, 1-3kg of coagulant aid and 0.05-0.1 kg of bactericide;
the flocculant is one of polyaluminium chloride, basic aluminum sulfate and ferrous sulfate, and the coagulant aid is polyacrylamide; the bactericide is dodecyl dimethyl benzyl ammonium chloride.
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