CN111927409B - Water drainage and gas production system and method for prolonging life cycle of gas well of gas field - Google Patents
Water drainage and gas production system and method for prolonging life cycle of gas well of gas field Download PDFInfo
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- CN111927409B CN111927409B CN202010832725.2A CN202010832725A CN111927409B CN 111927409 B CN111927409 B CN 111927409B CN 202010832725 A CN202010832725 A CN 202010832725A CN 111927409 B CN111927409 B CN 111927409B
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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
- 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 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
- E21B43/34—Arrangements for separating materials produced by the well
Abstract
The invention provides a drainage gas production system for prolonging the life cycle of a gas well of a gas field, which comprises a plurality of gas-liquid separators, a plurality of gas-liquid separators and a plurality of gas wells to be subjected to gas-liquid separation, wherein the gas-liquid separators are in one-to-one correspondence with the gas wells; one end of each gas output pipe is positioned in each gas well, and the other end of each gas output pipe is communicated with the gas inlet of each gas-liquid separator; one end of each gas input pipe is communicated with the gas outlet of each gas-liquid separator, and the other end of each gas input pipe is positioned in the lower gas well; the external conveying pipeline is connected with the gas input pipe at the tail end and used for outputting gas outwards, and a flow valve is further arranged on the external conveying pipeline; the air compressor is connected with the gas input pipe at the tail end through a first circulating pipe at the air inlet end, and connected with each gas input pipe through a second circulating pipe at the air outlet end; the first circulating pipe and the second circulating pipe are respectively provided with a first valve; the invention also provides a water drainage and gas recovery method, which has the advantages of simple flow, low cost, convenient operation and strong practicability, and can improve the final recovery ratio of the gas field.
Description
Technical Field
The invention relates to the technical field of low-yield gas well development, in particular to a drainage gas production system and method for prolonging the life cycle of a gas well of a gas field.
Background
In the process of natural gas exploitation, along with the prolonging of the production time of a gas well, the yield of a single well is gradually reduced, the liquid carrying capacity is gradually poor, the liquid accumulation of a shaft is gradually serious, and the productivity of the gas well is seriously influenced. Due to the existence of liquid accumulation in a shaft of the gas well, the pressure of a waste stratum is increased, and the ultimate recovery efficiency of the gas field is further influenced. The research and innovation of the drainage and gas production process technology of the gas field can thoroughly eliminate the accumulated liquid in the shaft, improve the yield of a single well, realize the long-term stable yield of the gas field, improve the final recovery efficiency and make the benefit development urgent.
In the prior art, in order to increase the yield of a single well of a low-yield gas well, a commonly adopted yield increasing method comprises the following steps: although the measures in the prior art can solve the single well problem, the measures in the prior art have the problems of high operation cost, large workload, short time effect and poor drainage and gas production effects in low-yield wells. Therefore, it is necessary to develop a drainage gas production system with simple flow, low cost, convenient operation and strong practicability, which can eliminate the accumulated liquid in the shaft and improve the ultimate recovery ratio of the gas field, and has very important significance for prolonging the life span of the gas field.
Disclosure of Invention
The invention aims to provide a drainage gas production system and a drainage gas production method for prolonging the life span of a gas well of a gas field, so as to solve the problems in the background technology.
The invention provides a water drainage and gas production system for prolonging the life span of a gas well of a gas field, which comprises
The gas-liquid separators are respectively in one-to-one correspondence with the gas wells to be subjected to gas-liquid separation;
the gas output pipes are used for conveying gas in each gas well to the gas-liquid separators which correspond to the gas output pipes one by one, one end of each gas output pipe is positioned in each gas well, and the other end of each gas output pipe is communicated with the gas inlet of each gas-liquid separator;
the gas input pipes are used for injecting the gas separated by each gas-liquid separator into a lower gas well adjacent to the corresponding gas well, one end of each gas input pipe is communicated with the gas outlet of each gas-liquid separator, and the other end of each gas input pipe is positioned in the lower gas well;
the outward conveying pipeline is connected with the gas input pipe at the tail end and used for outputting gas outwards, and a flow valve is further arranged on the outward conveying pipeline;
the air inlet end of the air compressor is connected with the gas input pipe at the tail end through a first circulating pipe, and the air outlet end of the air compressor is connected with each gas input pipe through a second circulating pipe;
the first circulating pipe and the second circulating pipe are respectively provided with a first valve.
A drainage gas production system for prolonging the life cycle of a gas well of a gas field further comprises a last well choke, and the last well choke can be thrown into the gas well corresponding to a gas-liquid separator at the tail end.
Preferably, a connecting pipe with a second valve is arranged between the gas input pipes.
Preferably, the bottom of each gas-liquid separator is provided with a liquid drainage branch pipe with a drain valve, and liquid drained by the liquid drainage branch pipe is stored in the water collection tank.
Preferably, a pressure sensor and a flowmeter are arranged on the gas output pipe.
Preferably, the gas output pipe and the gas input pipe are further provided with a third valve.
A water drainage and gas production method for extending the life of a gas well of a gas field, comprising the steps of:
step S1: conveying gas to be separated in each gas well into each gas-liquid separator communicated with the gas-liquid separator through a gas output pipe for gas-liquid separation, conveying the separated gas into the next gas well adjacent to the gas-liquid separator through each gas input pipe for pressurizing the next gas well, and extracting the gas in each gas well in a serial connection mode among the wells, wherein the extracted gas of each gas well is conveyed into an output pipeline through the gas input pipe at the tail end;
step S2: controlling the gas in the tail end gas input pipe to be input into the outward transmission pipeline or the first circulating pipe through the opening and closing of a flow valve arranged on the outward transmission pipeline; when the flow rate of the flow valve is smaller than the set value of the flow valve, closing the flow valve, opening the first valve, inputting the gas in the gas input pipe at the tail end into the first circulating pipe, pressurizing the gas by an air compressor, conveying the gas to the second circulating pipe, and injecting the gas into one or more gas input pipes communicated with the second circulating pipe; when the set value of the flow valve is equal to or greater than the set value, the flow valve is opened, the first valve is closed, and the gas in the gas input pipe at the tail end is input into the outward transmission pipeline;
when gas is produced, the gas output quantity of each gas well is obtained through a pressure sensor and a flowmeter on each gas output pipe, and when the gas output quantity is smaller than a preset value, a valve on a gas input pipe in the gas well where the gas output pipe is located is closed; and the gas in the gas input pipe is conveyed to the next gas well through a connecting pipe;
and when the flow rate on the export pipeline is larger than the maximum threshold flow rate which can be conveyed by the export pipeline, projecting a tail well choke in the tail-end gas well.
The beneficial effects of the invention are:
compared with the prior art, the method has the advantages that,
1. the drainage gas production system and the drainage gas production method provided by the invention have the advantages of simple flow, convenience in operation, no need of gas production process measures such as compressor gas lift, nitrogen gas lift, plunger gas lift or foam drainage and the like for gas production of each single well, low production cost and strong practicability.
2. The gas-liquid separation device has the advantages that the gas input pipes, the gas output pipes and the gas-liquid separators are adopted to realize series connection among a plurality of gas wells, gas produced by each gas well corresponding to each gas-liquid separator is injected into an adjacent gas well after gas-liquid separation, and the gas-liquid separation device is used for gas lift pressurization of the next adjacent gas well, so that the production cost of a single well is reduced, the production effect of a low-yield gas well can be improved by a gas lift pressurization mode, and the total operation cost of natural gas production can be reduced by the gas lift pressurization mode.
3. According to the invention, the produced gas after series connection between the gas wells can be pressurized again through one air compressor by setting the circulating gas lift device, and then sent into each gas well or one gas well for circulating gas lift until the flow of the gas input pipe at the tail end into the external transmission pipeline meets the set flow of the flow valve, so that the gas in each gas well is produced, the difficulty in producing the gas in the low-yield gas well can be reduced, the accumulated liquid in the shaft of the low-yield gas well can be eliminated, and the final recovery ratio of the gas field can be improved.
4. The invention judges whether the final well choke holder needs to be thrown in or not through the operating pressure on the external transmission pipeline, and saves the throwing and fishing cost of the choke holder compared with the prior art that the final well choke holder needs to be thrown in a single well. The operation pressure in the external conveying pipeline is lower than the maximum pressure which can be born by the gas-liquid mixed conveying pipe, the final well choke is not required to be put in, the throwing and fishing cost of the choke is reduced, and the operation pressure in the gas-liquid mixed conveying pipe is higher than the maximum pressure which can be born by the gas-liquid mixed conveying pipe, so that the final well choke is required to be put in.
5. The connecting pipes are arranged among the gas input pipes, so that one of the gas wells in the series gas wells can be overhauled or scrapped without affecting the overall production of the gas wells.
Drawings
FIG. 1 is a process flow diagram of a drainage gas recovery system for extending the life of a gas well of a gas field;
FIG. 2 is a schematic diagram of a main body of a drainage gas production system for extending the life of a gas well of a gas field;
FIG. 3 is a schematic diagram of the operation of a drainage gas recovery system for extending the life of a gas well in a gas field;
description of the reference numerals:
1. the gas well comprises a gas well, 2 gas output pipes, 3 gas input pipes, 4 gas-liquid separators, 5 external transmission pipelines, 6 liquid discharge branch pipes, 6-1 drain valves, 7 air compressors, 8 first circulating pipes, 8-1 second circulating pipes, 9 connecting pipes, 10 flow valves, 11 first valves, 12 water collecting tanks, 13 pressure sensors, 14 flow meters, 15 third valves, 16 connecting pipes and 17 liquid transmission pipes with one-way valves.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
Examples
1-3, embodiments of the present invention provide a drainage gas production system for extending the life of a gas well of a gas field, comprising
The gas-liquid separators 4 are respectively in one-to-one correspondence with the gas wells 1 to be subjected to gas-liquid separation;
the gas output pipes 2 are used for conveying gas in each gas well 1 to each gas-liquid separator 4 corresponding to the gas output pipes one by one, one end of each gas output pipe 2 is positioned in each gas well 1, and the other end of each gas output pipe is communicated with a gas inlet of each gas-liquid separator 4;
the gas input pipes 3 are used for injecting the gas separated by each gas-liquid separator 4 into the next gas well 1 adjacent to the corresponding gas well 1, one end of each gas input pipe 3 is communicated with the gas outlet of each gas-liquid separator 4, and the other end of each gas input pipe 3 is positioned in the next gas well 1;
the outward conveying pipeline 5 is connected with the gas input pipe 3 at the tail end and used for outputting gas outwards, and a flow valve 10 is further arranged on the outward conveying pipeline 5;
an air compressor 7, the air inlet end of which is connected with the gas input pipe 3 at the tail end through a first circulating pipe 8, and the air outlet end of which is connected with each gas input pipe 3 through a second circulating pipe 8-1;
the first circulation pipe 8 and the second circulation pipe 8-1 are provided with a first valve 11.
In the embodiment, in order to solve the problems that in the prior art, when gas production is performed, gas production processes such as gas lift by an air compressor or nitrogen gas lift production or plunger gas lift production or foam drainage need to be adopted for each single well, so that the cost of gas production is increased, the practicability is poor, and accumulated liquid in a single well shaft cannot be completely eliminated, the invention selects the multiple gas wells 1, and the multiple gas wells 1 are connected in series through the gas output pipes 2, the gas-liquid separators 4 for separating produced gas in the gas wells 1 and the gas input pipes 3, preferably, the multiple gas wells 1 are sequenced from high to low in gas production rate when being connected in series, when in use, if the number of the gas wells 1 is three, when the three gas wells 1 are produced, the control switches of the third valves 15 arranged on the gas input pipes 2 and the gas output pipes 3 need to be manually opened, the gas in the No. 1 high-yield gas well 1 is conveyed into a gas-liquid separator 4 communicated with a gas output pipe 2 in the gas well 1 for gas-liquid separation, the separated gas is conveyed into the No. 2 gas well 1 (next gas well 1) adjacent to the high-yield gas well 1 through a gas input pipe 3 communicated with the gas-liquid separator 4 for gas lift of the gas in the No. 2 gas well 1, the gas in the No. 2 gas well 1 after gas lift is conveyed into the gas-liquid separator 4 communicated with the gas output pipe 2 again through the gas output pipe 2 in the No. 2 gas well 1 for gas lift of the gas in the No. 3 gas well 1, the gas in the No. 3 gas well 1 after gas lift is conveyed into the No. 3 gas well 1 through the gas input pipe 3 communicated with the gas-liquid separator 4 in the gas output pipe 2 in the No. 3 gas well for gas lift of the gas in the No. 3 gas well 1 again through the gas output pipe 2 in the No. 3 gas output pipe 2 Separating gas from liquid, directly sending the gas separated by a first valve 11 arranged on the first circulating pipe 8 and the second circulating pipe 8-1 into an external conveying pipeline 5 through a tail end gas input pipe 3 communicated with the gas-liquid separator 4 without opening the first circulating pipe, wherein a flow valve 10 is arranged on the external conveying pipeline 5, when a controller controls the flow valve 10 arranged on the external conveying pipeline 5, and the set value of the flow valve 10 is more than or equal to the actual flow rate in the external conveying pipeline 5, the controller opens the flow valve 10, and the gas in the tail end gas input pipe 3 is output from the external conveying pipeline 5; when the set value of the flow valve 10 is smaller than the actual flow in the external transportation pipeline 5, the controller cannot open the flow valve 10, the operator needs to manually open a first valve 11 on a first circulation pipe 8 and a second circulation pipe 8-1, the gas in the endmost gas input pipe 3 is conveyed into an air compressor 7 through the first circulation pipe 8 for pressurization, the pressurized gas is conveyed to each gas well 1 through the second circulation pipe 8-1 (or the first valve 11 communicated with the gas well 1 with the highest yield is manually opened, the gas pressurized by the air compressor 7 is conveyed into the gas well 1 with the highest yield), the gas produced in the gas well 1 with the high yield is conveyed into a gas-liquid separator 4 corresponding to the gas-liquid separator through a gas output pipe 2 communicated with the gas output pipe for gas-liquid separation, and the separated gas is conveyed into the gas well 2 through a gas input pipe 3, after gas lift, gas in the No. 2 gas well is conveyed into a gas-liquid separator 4 corresponding to the gas-liquid separator through a gas output pipe 2 communicated with the gas-liquid separator, the separated gas is conveyed into the No. 3 gas well through a gas input pipe 3 again, after gas lift, the gas in the No. 3 gas well is conveyed into the gas-liquid separator 4 corresponding to the gas-liquid separator through a gas output pipe 2 communicated with the gas-liquid separator, gas-liquid separation is carried out, at the moment, a first circulating pipe 8 and a first valve 11 arranged on a second circulating pipe 8-1 are closed, the separated gas is conveyed into an external conveying pipeline 5 through a tail end gas input pipe 3, when the set value of a flow valve 10 is larger than or equal to the actual flow rate in the external conveying pipeline 5, the flow valve 10 is opened by a controller, and the gas in the tail end gas input pipe 3 is output by the external conveying pipeline 5; when the set value on the flow valve 10 is smaller than the actual flow in the external transportation pipeline 5, the controller cannot open the flow valve 10, manually open the first valve 11 on the first circulating pipe 8 and the second circulating pipe 8-1, the gas in the tail end gas input pipe 3 is conveyed into the air compressor 7 through the first circulating pipe 8 for pressurization, the pressurized gas is conveyed to each gas well 1 through the second circulating pipe 8-1 (or only the first valve 11 communicated with the gas well 1 with the highest yield is opened, and the gas pressurized through the air compressor 7 is conveyed into the gas well 1 with the highest yield), and the operation is circulated until the set value on the flow valve 10 on the external transportation pipeline 5 is larger than or equal to the actual flow in the external transportation pipeline 5, the controller opens the flow valve 10 arranged in the external transportation pipeline 5 and discharges the gas through the external transportation pipeline 5; then a fourth valve arranged on a pipeline of a connecting pipe 16 is manually opened, the gas in the gas input pipe 3 at the tail end is sent into the water collecting tank 12 through the connecting pipe 16, and the gas and the liquid in the water collecting tank 12 are sent into the external delivery pipeline 5 through a delivery pipe 17 with a one-way valve arranged at the bottom of the water collecting tank 12 to be output.
In order to reduce the operating pressure of the external conveying pipeline 5, improve the liquid carrying capacity of the internal gas flow of the external conveying pipeline and slow down the bottom excitation degree of the tail-end gas well 1, the invention further comprises a tail-well choke which can be thrown into the gas well 1 corresponding to the tail-end gas-liquid separator 4.
Wherein, a connecting pipe 9 with a second valve is arranged between the gas input pipes 3, the purpose of the arrangement is to overhaul one (or more) of the gas wells 1, or when the yield of one gas well 1 or more gas wells 1 is less than a preset value, a third valve 15 on the gas input pipe 3 in the gas well 1 to be overhauled or scrapped and a third valve 15 on the gas output pipe 2 in the gas well 1 need to be closed, the second valve on the connecting pipe 9 connected with the gas well 1 to be overhauled or scrapped is manually opened, the gas in the scrapped gas well 1 or the gas well 1 on the gas well 1 to be overhauled is sent into the connecting pipe 9 through the gas input pipe 3 communicated with the gas-liquid separator 4 and is communicated with the gas input pipe 3 connected with the gas well 1 next to be scrapped or overhauled after gas-liquid separation, so as to avoid the overhaul or scrapping of one gas well 1, affecting gas production in other gas wells.
The liquid discharge branch pipes 6 with drain valves 6-1 are arranged at the bottoms of the gas-liquid separators 4, liquid discharged by the liquid discharge branch pipes 6 is collected to a liquid discharge main pipe and stored in the water collecting tank 12, the purpose of the arrangement is to increase the gas separation effect of the gas-liquid separators 4, so that the liquid which is conveyed into the gas-liquid separators 4 and subjected to gas-liquid separation is discharged through the drain pipes 6 communicated with the bottoms of the gas-liquid separators 4 and stored in the water collecting tank 12, each liquid discharge branch pipe 6 is provided with a drain valve 6-1 for ensuring that water is discharged, the phenomenon that a pipeline is blocked in winter to influence water discharge is avoided, a valve is further arranged at the inlet of the water collecting tank 12, and when the liquid in the water collecting tank 12 reaches the maximum capacity, a fifth valve positioned at the inlet of the water collecting tank 12 is manually closed to prevent overflow.
The gas output pipe 2 is provided with a pressure sensor 13 and a flowmeter 14, so that the gas output of each gas well 1 can be observed conveniently, and whether the gas well 1 should be abandoned or not is judged according to the produced quantity of the gas well 1, so that the gas production cost can be saved.
Wherein, the gas output pipe 2 and the gas input pipe 3 are also provided with a third valve 15.
A water drainage and gas production method for prolonging the life span of a gas well of a gas field comprises the following steps:
step S1: conveying gas to be separated in each gas well into each gas-liquid separator 4 communicated with each gas-liquid separator through each gas output pipe 2 for gas-liquid separation, conveying the separated gas into the next gas well 1 adjacent to the next gas well through each gas input pipe 3 for pressurizing the next gas well 1, extracting the gas in each gas well 1 in a series connection mode among the wells, and inputting the extracted gas of each gas well 1 into an external conveying pipeline 5 through the gas input pipe 3 at the tail end; the gas wells 1 are connected in series through a plurality of gas output pipes 2, a plurality of gas-liquid separators 4 and a plurality of gas input pipes 3, the gas wells 1 are connected in series in sequence from high to low in yield when being connected in series, and the number of the gas wells 1 connected in series is reduced when the return pressure of the foremost gas well 1 in the series gas wells is higher than the design pressure of the outlet of an air compressor 7; when the number of the gas wells 1 connected in series is 3, and when gas in each gas well 1 is produced, manually opening a third valve 15 on a plurality of gas input pipes 3 communicated with the plurality of gas wells 1 connected in series and a third valve 15 on a plurality of gas output pipes 2, sending the gas in the high-yield gas well 1 at the head of the series into a gas-liquid separator 4 through the gas output pipe 2 communicated with the gas well 1, sending the gas after gas-liquid separation into the 2 nd gas well 1 adjacent to the high-yield gas well 1 for gas lift, sending the gas in the 2 nd gas well 1 after gas lift into the gas-liquid separator 4 through the gas output pipe 2 communicated with the gas well 1 for gas-liquid separation, sending the separated gas into the 3 rd gas well 1 through the gas input pipe 3 connected with the gas input pipe, sending the gas in the third gas well 1 after gas lift production into the gas-liquid separator 4 through the gas output pipe 2 communicated with the third gas well 1, and then outputting the gas through the gas input pipe 3 at the tail end of the gas input pipe 3, the gas flow in the outgoing pipeline 5 is more than or equal to the set value of the flow valve 10, and the gas in the tail gas input pipe 3 is output by the outgoing pipeline 5;
step S2: controlling the gas in the tail gas input pipe 3 to be input into the outward conveying pipeline 5 or the first circulating pipe 8 by opening and closing a flow valve 10 arranged on the outward conveying pipeline 5; when the flow of the flow valve 10 is smaller than the set value of the flow valve 10, the flow valve 10 is closed, the first valve 11 is opened, the gas in the gas input pipe 3 at the tail end is input into the first circulating pipe 8, is pressurized by the air compressor 7 and then is conveyed to the second circulating pipe 8-1, and is injected into one or more gas input pipes 3 communicated with the second circulating pipe 8-1; when the set value of the flow valve 10 is equal to or greater than the set value, the flow valve 10 is opened, the first valve 11 does not need to be opened, the gas in the endmost gas input pipe 3 is input into the outgoing pipeline 5, wherein when gas production is performed on a plurality of gas wells 1 in a manner of connecting the gas wells in series, when the set value on the flow valve 10 is greater than or equal to the actual flow rate in the outgoing pipeline 5, the flow valve 10 is opened by a controller, and the gas in the endmost gas input pipe 3 is output through the outgoing pipeline 5; when the set value of the flow valve 10 is smaller than the actual flow in the external conveying pipeline 5, the controller cannot open the flow valve 10, at this time, the gas in the endmost gas input pipeline 3 needs to be extracted through circulating gas lift pressurization, when circulating gas lift is performed, a worker needs to manually open a first valve 11 on a first circulating pipeline 8 and a second circulating pipeline 8-1, the gas in the endmost gas input pipeline 3 is conveyed into an air compressor 7 through the first circulating pipeline 8 to be pressurized, the pressurized gas is conveyed into a gas well 1 at the head of the series connection through a second circulating pipeline 8-2 to perform gas lift on the gas well 1 or conveyed into a plurality of gas wells 1 on the series connection pipeline, gas lift is performed on the plurality of gas wells, the gas in the plurality of gas wells 1 is extracted by adopting a gas extraction method of S1 and collected into the endmost gas input pipeline 3, at this time, the first valve 11 on the first circulating pipeline 8 is closed, the gas after the gas lift in the gas input pipe 3 at the tail end flows through the outward transmission pipeline 5, when the controller detects that the actual flow on the outward transmission pipeline 5 is greater than or equal to the set value of the flow valve 10, the flow valve 10 is opened, and the gas after the gas lift in the gas input pipe 3 at the tail end is extracted from the outward transmission pipeline 5; when the controller detects that the actual flow on the outward conveying pipeline 5 is smaller than the set value of the flow valve 10, the flow valve 10 is not opened, the first circulating pipe 8 and the first valve 11 on the second circulating pipe 8-1 are manually opened again, and the gas in the gas input pipe 3 at the tail end after the gas lift is circulated and pressurized again;
when gas production is carried out, the gas output quantity of each gas well 1 is obtained through the pressure sensor 13 and the flow meter 14 on each gas output pipe 2, and when the gas output quantity is smaller than a preset value, the third valve 15 on the gas input pipe 3 in the gas well where the gas output pipe 2 is located is closed; the gas in the gas input pipe 3 is conveyed to the next gas well 1 through the connecting pipe 9, when the produced quantity of the gas well 1 at the tail end is smaller than a preset value detected by a flow meter on the gas output pipe 2, the gas well is abandoned, the gas well 1 adjacent to the gas well 1 at the tail end is changed into the gas well at the tail end, the third valve 15 in the gas input pipe 3 of the abandoned gas well 1 at the tail end is manually closed, the first valve 11 between the second circulating pipe 8-1 and the gas input pipe 3 on the gas well 1 at the tail end is manually closed, and the gas in the gas input pipe 3 is output through the connecting pipe 9, so that the production cost is saved;
when the flow rate in the export pipeline 5 is greater than the maximum threshold flow rate that the export pipeline 5 can deliver, a last well choke is projected in the endmost gas well 1.
The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be considered by those skilled in the art are within the scope of the present invention.
Claims (3)
1. A drainage gas recovery system for prolonging the life span of a gas well of a gas field is characterized by comprising
The gas-liquid separators (4) are respectively in one-to-one correspondence with the gas wells (1) to be subjected to gas-liquid separation;
the gas output pipes (2) are used for conveying gas in each gas well (1) to each gas-liquid separator (4) corresponding to the gas output pipes one by one, one end of each gas output pipe (2) is located in each gas well (1), the other end of each gas output pipe is communicated with a gas inlet of each gas-liquid separator (4), and a pressure sensor (13) and a flowmeter (14) are arranged on each gas output pipe (2);
the gas input pipes (3) are used for injecting the gas separated by each gas-liquid separator (4) into the next gas well (1) adjacent to the corresponding gas well (1), one end of each gas input pipe (3) is communicated with the gas outlet of each gas-liquid separator (4), and the other end of each gas input pipe is positioned in the next gas well (1);
the outward conveying pipeline (5) is connected with the gas input pipe (3) at the tail end and used for outputting gas outwards, and a flow valve (10) is further arranged on the outward conveying pipeline (5);
an air compressor (7), wherein the air inlet end of the air compressor is connected with the gas input pipe (3) at the tail end through a first circulating pipe (8), and the air outlet end of the air compressor is connected with each gas input pipe (3) through a second circulating pipe (8-1);
the first circulating pipe (8) and the second circulating pipe (8-1) are both provided with a first valve (11);
a connecting pipe (9) with a second valve is also arranged between the gas input pipes (3);
the gas well choke further comprises a last well choke, and the last well choke can be thrown into the gas well (1) corresponding to the gas-liquid separator (4) at the tail end;
the drainage gas recovery method adopted by the drainage gas recovery system comprises the following steps:
step S1: conveying gas to be separated in each gas well into each gas-liquid separator (4) communicated with the gas-liquid separator through a gas output pipe (2) for gas-liquid separation, conveying the separated gas into the next gas well (1) adjacent to the gas-liquid separator through each gas input pipe (3) for pressurizing the next gas well (1), extracting the gas in each gas well (1) in a mode of connecting the gas wells in series, and inputting the extracted gas of each gas well (1) into an external conveying pipeline (5) through the gas input pipe (3) at the tail end;
step S2: controlling the gas in the gas input pipe (3) at the tail end to be input into the external transmission pipeline (5) or the first circulating pipe (8) through the opening and closing of a flow valve (10) arranged on the external transmission pipeline (5); when the flow rate of the flow valve (10) is smaller than the set value of the flow valve (10), the flow valve (10) is closed, the first valve (11) is opened, the gas in the gas input pipe (3) at the tail end is input into the first circulating pipe (8), is pressurized by the air compressor (7) and then is conveyed to the second circulating pipe (8-1) and is injected into one or more gas input pipes (3) communicated with the second circulating pipe (8-1); when the set value of the flow valve (10) is equal to or greater than the set value, the flow valve (10) is opened, the first valve (11) is closed, and the gas in the gas input pipe (3) at the tail end is input into the external transmission pipeline (5);
when gas is produced, the gas produced quantity of each gas well (1) is obtained through a pressure sensor (13) and a flowmeter (14) on each gas output pipe (2), and when the gas produced quantity is smaller than a preset value, a valve on a gas input pipe in the gas well where the gas output pipe (2) is located is closed; and the gas in the gas input pipe (3) is conveyed to the next gas well (1) through a connecting pipe (9);
when the flow rate on the export pipeline (5) is larger than the maximum threshold flow rate which can be conveyed by the export pipeline (5), a final well choke is projected in the endmost gas well (1).
2. The drainage gas production system for prolonging the life span of a gas well of a gas field as claimed in claim 1, wherein a drainage branch pipe (6) with a drain valve (6-1) is arranged at the bottom of each gas-liquid separator (4), and liquid drained from the drainage branch pipe (6) is stored in a water collecting tank (12).
3. The drainage and gas production system for extending the life of a gas well in a gas field as claimed in claim 1, wherein the gas outlet pipe (2) and the gas inlet pipe (3) are further provided with a third valve (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832725.2A CN111927409B (en) | 2020-08-18 | 2020-08-18 | Water drainage and gas production system and method for prolonging life cycle of gas well of gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832725.2A CN111927409B (en) | 2020-08-18 | 2020-08-18 | Water drainage and gas production system and method for prolonging life cycle of gas well of gas field |
Publications (2)
| Publication Number | Publication Date |
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| CN111927409A CN111927409A (en) | 2020-11-13 |
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