CN113446202A - Gas compression equipment, self-temperature-control gas injection system and gas injection method - Google Patents
Gas compression equipment, self-temperature-control gas injection system and gas injection method Download PDFInfo
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- CN113446202A CN113446202A CN202010211209.8A CN202010211209A CN113446202A CN 113446202 A CN113446202 A CN 113446202A CN 202010211209 A CN202010211209 A CN 202010211209A CN 113446202 A CN113446202 A CN 113446202A
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- 230000006835 compression Effects 0.000 title claims abstract description 148
- 238000007906 compression Methods 0.000 title claims abstract description 148
- 238000002347 injection Methods 0.000 title claims abstract description 78
- 239000007924 injection Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 53
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 364
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 59
- 239000003245 coal Substances 0.000 claims description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
-
- 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
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
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- General Engineering & Computer Science (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a gas compression device, a temperature self-control gas injection system and a gas injection method, wherein in the gas compression device, a gas inlet pipeline, a filter, a multi-stage reciprocating gas compression unit connected in series and a gas exhaust pipeline are sequentially connected through pipelines; the first automatic control valve is arranged on an outlet pipeline of the last stage of gas compression unit; the second automatic control valve is arranged on the bypass pipeline, and two ends of the second automatic control valve are respectively positioned at the upstream and the downstream of the first automatic control valve; the temperature transmitter is arranged on the exhaust pipeline, is respectively electrically connected with the first automatic control valve and the second automatic control valve, and is used for controlling the opening degrees of the first automatic control valve and the second automatic control valve in an interlocking manner, so that the sum of the opening degree of the first automatic control valve and the opening degree of the second automatic control valve is 100%; the multi-stage reciprocating gas compression unit shares one cooler. The gas compression equipment has higher automation control degree and higher adaptability, and the adaptability to the field production environment under complex terrains is obviously improved.
Description
Technical Field
The invention relates to the field of coal bed gas exploitation, in particular to gas compression equipment, a temperature self-control gas injection system and a gas injection method.
Background
The storage state of the coal bed gas in the coal bed is divided into an adsorption state, a flow-off state and a dissolution state, wherein more than 95% of the coal bed gas is in the coal bed in the adsorption state, and the coal bed gas is in a liquid film attached to the surface of micropores and can not freely move. According to the type of the coal bed gas, gas is required to be injected into the coal bed gas well to replace the coal bed gas absorbed in the coal bed, so that the purposes of coal bed gas exploitation and yield increase are achieved.
The device mainly comprises an internal combustion engine, a compressor, a gas conveying pipe, a chemical feeding tank and the like, wherein the internal combustion engine is connected with the compressor through a hydraulic clutch to generate high-pressure gas (the main component is carbon dioxide), and the gas is injected into a coal bed gas reservoir through the gas conveying pipe. Before gas is injected, surfactant and corrosion inhibitor are automatically added into the medicine tank through the gas pipe, so that the aims of blockage removal, corrosion prevention and fracturing are fulfilled.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the prior art is uncontrollable in temperature of injected gas, so that the adaptability is poor.
Disclosure of Invention
In view of the above, the present invention provides a gas compression device, a temperature self-controlling gas injection system and a gas injection method, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
in one aspect, an embodiment of the present invention provides a gas compression apparatus, including: the system comprises an air inlet pipeline, a filter, a multistage reciprocating gas compression unit, a cooler, a first automatic control valve, a second automatic control valve, a temperature transmitter and an exhaust pipeline, wherein the multistage reciprocating gas compression unit, the cooler, the first automatic control valve, the second automatic control valve, the temperature transmitter and the exhaust pipeline are connected in series;
the gas inlet line, the filter, the serially connected multi-stage reciprocating gas compression units, and the gas outlet line are connected in sequence by pipelines;
the first automatic control valve is arranged on an outlet pipeline of the gas compression unit at the last stage;
the second automatic control valve is arranged on a bypass pipeline, two ends of the bypass pipeline are respectively connected with an outlet pipeline of the last stage of gas compression unit, one end of the bypass pipeline is positioned at the upstream of the first automatic control valve, and the other end of the bypass pipeline is positioned at the downstream of the first automatic control valve;
the temperature transmitter is arranged on the exhaust pipeline, is respectively electrically connected with the first automatic control valve and the second automatic control valve, and is used for controlling the opening degrees of the first automatic control valve and the second automatic control valve in an interlocking manner, so that the sum of the opening degree of the first automatic control valve and the opening degree of the second automatic control valve is 100%;
the multistage reciprocating type gas compression unit shares one cooler, and gas compressed by the gas compression unit at the current stage is cooled by the cooler and then is input into the gas compression unit at the next stage.
In a possible implementation, a safety valve is provided in the outlet line of the gas compression unit of each stage.
In one possible implementation, a check valve is provided on the exhaust line.
In one possible implementation, the gas compression unit is provided with four stages.
In another aspect, a temperature self-controlled gas injection system is provided, wherein the temperature self-controlled gas injection system employs any one of the gas compression devices described above.
In one possible implementation, the temperature self-controlling gas injection system further includes: a nitrogen production device, a gas production wellhead device and a gas production pipe column;
the nitrogen production device, the gas compression equipment, the gas production wellhead device and the gas production pipe column are sequentially connected, and the gas production pipe column is positioned in a casing of the coal bed gas well;
and a packer is arranged on the gas production pipe column and used for plugging an annular space between the gas production pipe column and the sleeve.
In one possible implementation, the bottom of the gas production string extends below the coal bed methane reservoir;
the distance between the bottom of the gas production pipe column and the bottom of the coal bed gas reservoir is 10-40 meters.
In one possible implementation, the distance between the bottom of the packer and the top of the coalbed methane reservoir is 10-20 meters.
In one possible implementation, the nitrogen plant and the gas compression plant are both skid-mounted.
In another aspect, an embodiment of the present invention further provides a temperature self-controlling gas injection method, where the temperature self-controlling gas injection method employs any one of the above temperature self-controlling gas injection systems.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the gas compression equipment provided by the embodiment of the invention can not only compress gas to pressurize the gas, but also automatically control the temperature of the compressed gas to meet the use requirement. Specifically, the gas enters a filter for filtering through an air inlet pipeline, and the filtered gas enters a multi-stage reciprocating gas compression unit connected in series for multi-stage compression so as to reach a desired pressure value. In the process, the pressure and the temperature of the gas compressed by each stage of reciprocating gas compression unit are increased, in order to ensure the safety of subsequent compression operation and ensure that the temperature of the gas finally compressed is within an expected range, the gas compressed by each stage of reciprocating gas compression unit is cooled by a cooler and then enters the next stage of gas compression unit for recompression. After compressed gas passes through the last-stage reciprocating gas compression unit, any one of three temperature modes of normal-temperature gas injection, high-temperature gas injection and temperature-limited gas injection can be realized under the control of the first automatic control valve, the second automatic control valve and the temperature transmitter, the automatic gas injection device has higher automation control degree and higher adaptability, and the adaptability to the field production environment under complex terrains is obviously improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an exemplary gas compression apparatus provided in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exemplary temperature self-controlling gas injection system according to an embodiment of the present invention.
The reference numerals denote:
1-a gas compression device, the gas compression device,
101-the gas inlet line,
102-a filter, which is arranged in a filter,
103-a reciprocating gas compression unit,
104-the cooling of the liquid to be cooled,
105-a first self-controlled valve, and,
106-a second self-controlled valve, and,
107-a temperature transmitter-a temperature sensor,
108-the line of the exhaust line,
109-a one-way valve, which is arranged in the valve,
110-a fan-which is,
111-a safety valve, which is arranged in the safety valve,
2-a nitrogen-making device, wherein,
3-a gas production wellhead device,
4-a gas production pipe column is adopted,
401-packer.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
For gas injection operation of a coal bed gas reservoir, the prior art discloses a high-pressure oxygen-free production-increasing blockage-removing gas injection device for a coal bed gas well and a using method. Before gas is injected, surfactant and corrosion inhibitor are automatically added into the medicine tank through the gas pipe, so that the aims of blockage removal, corrosion prevention and fracturing are fulfilled.
However, the prior art has poor adaptability to the temperature of injected gas, particularly to the field production environment under complex terrains.
In one aspect, an embodiment of the present invention provides a gas compression apparatus, as shown in fig. 1, the gas compression apparatus 1 including: an air intake line 101, a filter 102, a multi-stage reciprocating gas compression unit 103 connected in series, a cooler 104, a first autonomous valve 105, a second autonomous valve 106, a temperature transmitter 107, an exhaust line 108.
Wherein the gas inlet line 101, the filter 102, the multistage reciprocating gas compression unit 103 connected in series, and the gas outlet line 108 are connected in sequence by pipelines.
An outlet of each stage of the reciprocating gas compression unit 103 is connected to an inlet of the cooler 104 through a line, and an inlet of each stage of the reciprocating gas compression unit 103 is connected to an outlet of the cooler 104 through a line.
The first automatic control valve 105 is disposed on the outlet line of the last stage reciprocating gas compression unit 103;
the second automatic control valve 106 is disposed on the bypass line, and two ends of the bypass line are respectively connected to the outlet lines of the last stage reciprocating gas compression unit 103, one end of the bypass line is located at the upstream of the first automatic control valve 105, and the other end of the bypass line is located at the downstream of the first automatic control valve 105.
The temperature transmitter 107 is arranged on the exhaust pipeline 108, is electrically connected with the first automatic control valve 105 and the second automatic control valve 106 respectively, and is used for controlling the opening degrees of the first automatic control valve 105 and the second automatic control valve 106 in an interlocking manner, so that the sum of the opening degree of the first automatic control valve 105 and the opening degree of the second automatic control valve 106 is 100%;
the multistage reciprocating gas compression unit 103 shares one cooler 104, and gas compressed by the gas compression unit 103 in the previous stage is cooled by the cooler 104 and then is input to the gas compression unit 103 in the next stage.
The gas compression equipment provided by the embodiment of the invention can not only compress gas to pressurize the gas, but also automatically control the temperature of the compressed gas to meet the use requirement. Specifically, the gas enters a filter 102 through an inlet line 101 for filtering, and the filtered gas enters a multi-stage reciprocating gas compression unit 103 connected in series for multi-stage compression to reach a desired pressure value. In this process, the gas compressed by each stage of reciprocating gas compression unit 103 has not only increased pressure but also increased temperature, and in order to ensure the safety of the subsequent compression operation and ensure that the temperature of the finally compressed gas is within a desired range, the gas compressed by each stage of reciprocating gas compression unit 103 is cooled by the cooler 104 and then enters the next stage of gas compression unit for recompression. After the compressed gas passes through the last stage of reciprocating gas compression unit 103, any one of three temperature modes of normal-temperature gas injection, high-temperature gas injection and temperature-limited gas injection can be realized under the control of the first automatic control valve 105, the second automatic control valve 106 and the temperature transmitter 107, so that the method has higher automation control degree and higher adaptability, and the adaptability to the field production environment under complex terrains is obviously improved.
For the above three temperature modes, the following are respectively explained:
(1) for the ambient gas injection mode:
when the opening degree of the first automatic control valve 105 is adjusted to be fully opened (i.e., 100%), the opening degree of the second automatic control valve 106 is adjusted to be fully closed (i.e., 0%), and in this state, the high-temperature and high-pressure gas, such as nitrogen, compressed by the last-stage reciprocating gas compression unit 103 is cooled by the cooler 104, so that the gas temperature reaches the ambient temperature, and normal-temperature gas injection is realized.
In the normal-temperature gas injection mode, the opening degrees of the first automatic control valve 105 and the second automatic control valve 106 can be manually adjusted, and the opening degrees can also be adjusted by the temperature transmitter 107.
(2) For the high temperature gas injection mode:
when the opening degree of the second automatic control valve 106 is adjusted to be fully opened (i.e. 100%), the opening degree of the first automatic control valve 105 is adjusted to be fully closed (i.e. 0%), the high-temperature and high-pressure gas compressed by the last stage in this state directly enters the exhaust line 108 through the bypass line, and the gas temperature is approximately equal to the exhaust temperature of the reciprocating gas compression unit 103 of the last stage, for example, the gas temperature range may be 100-130 ℃.
In the high-temperature gas injection mode, the opening degrees of the first automatic control valve 105 and the second automatic control valve 106 can be manually adjusted, and the opening degrees can also be adjusted by the temperature transmitter 107.
(3) For temperature limited gas injection mode:
in the temperature-limited gas injection mode, the opening degrees of the first automatic control valve 105 and the second automatic control valve 106 are adjusted through the temperature transmitter 107, that is, when the temperature transmitter 107 detects that the temperature of the gas compressed by the last-stage reciprocating gas compression unit 103 is higher than a set temperature, the temperature transmitter 107 sends an instruction to control the opening degree of the first automatic control valve 105 to increase, and at the same time, the opening degree of the second automatic control valve 106 is controlled to decrease in an interlocking manner, so that the temperature of the gas in the exhaust pipeline 108 is reduced to reach the set temperature;
when the temperature transmitter 107 detects that the temperature of the gas compressed by the last-stage reciprocating gas compression unit 103 is lower than the set temperature, the temperature transmitter 107 sends a command to control the opening degree of the first automatic control valve 105 to decrease, and at the same time, the opening degree of the second automatic control valve 106 to increase in an interlocking manner, so that the temperature of the gas in the exhaust line 108 rises to reach the set temperature;
it is understood that when the temperature transmitter 107 detects that the temperature of the gas compressed by the last-stage reciprocating gas compression unit 103 is equal to the set temperature, the temperature transmitter 107 does not send a command, and the opening degrees of the first and second autonomous valves 105 and 106 are each maintained as they are, so that the temperature of the gas in the exhaust line 108 is maintained at the set temperature.
In the prior art, after compression, the main component of the generated high-pressure gas is carbon dioxide, so that the cost is high, and meanwhile, the daily oil consumption is high due to the use of an internal combustion engine, so that the high cost is also caused.
In the embodiment of the present invention, based on the use of the multi-stage reciprocating gas compression unit 103, the non-combustible gas can be compressed, for example, when nitrogen, air, etc. are used as the non-combustible gas, not only can the requirements of safe compression and safe gas injection be satisfied, but also the advantage of low cost is achieved. And when the gas compression equipment is used for injecting the coal bed gas, the purpose can be achieved without using an internal combustion engine, and the cost can be further reduced.
In embodiments of the present invention, it is desirable to use a gas compression device to compress nitrogen. At this time, the gas compression device provided by the embodiment of the invention can be called as a nitrogen compression device.
Among them, the filter 102 is used to filter and remove solids and liquids in the gas, and improve the compression effect.
Further, the gas compression apparatus according to the embodiment of the present invention is provided with a safety valve 11 on the outlet pipeline of each stage of the reciprocating gas compression unit 103.
By arranging the safety valve 11, once the gas pressure compressed by the current reciprocating gas compression unit 103 exceeds the set limit pressure, the safety valve 11 can be jacked open to discharge part of the gas, so that the gas pressure meets the requirement, and the purpose of safe operation is achieved.
Further, with the gas compression equipment provided by the embodiment of the present invention, the exhaust pipe line 108 is provided with the check valve 109, so as to ensure that gas with desired pressure and temperature can be smoothly output from the exhaust pipe line 108 to the downstream, for example, output to a coal bed gas well to achieve gas injection, and prevent backflow thereof, so that not only can the operation efficiency be ensured, but also the operation safety is ensured.
As mentioned above, the gas compression apparatus provided by the embodiment of the present invention includes the multi-stage reciprocating gas compression unit 103, for example, the multi-stage reciprocating gas compression apparatus may include two-stage, three-stage, four-stage, five-stage, six-stage reciprocating gas compression units 103.
In view of the volume of the gas compression apparatus so as not to be too large, and in view of achieving a good gas compression effect, the embodiment of the present invention provides a gas compression apparatus in which the reciprocating gas compression unit 103 is provided with four stages as shown in fig. 1.
The reciprocating gas compression unit 103 according to the embodiment of the present invention is common in the art, and for example, the same as a compression mechanism of a common reciprocating compressor, and may include: the reciprocating piston is used for reciprocating in the cylinder body of the cylinder to compress gas, and the crankshaft connecting rod mechanism is used for converting the circumferential telemechanical of the motor into reciprocating motion of the piston.
In the embodiment of the present invention, the multiple stages of reciprocating gas compression units 103 share one cooler 104, and the gas compressed by the previous stage of gas compression unit 103 is cooled by the cooler 104 and then input to the next stage of gas compression unit 103, so that the high temperature gas discharged from the outlet of the previous stage of reciprocating gas compression unit 103 is cooled by the cooler 104 and then enters the inlet of the next stage of reciprocating gas compression unit 103 through the cooler 104. To facilitate control of the above-described flow, gate valves may be provided on lines between the outlet and inlet of each stage of the reciprocating gas compression unit 103 and the cooler 104.
As shown in fig. 1, the connecting lines from the first stage reciprocating gas compression unit 103 to the last stage reciprocating gas compression unit 103 and the cooler 104 form a plurality of independent closed loop circuits, for example, 4 independent closed loop circuits when there are four stages of reciprocating gas compression units 103. The compressed gas outlet of the first-stage reciprocating gas compression unit 103 is communicated with the gas inlet of the cooler 104, and the gas outlet of the cooler 104 is communicated with the compressed gas inlet of the second-stage reciprocating gas compression unit 103, so that a first closed-loop circuit can be formed, and the rest three closed-loop circuits are formed in sequence by analogy.
The cooler 104 according to the embodiment of the present invention may be an air-cooled type cooler.
Further, in order to improve the cooling effect, an electric fan 110 is further provided for the cooler 104 to smoothly diffuse the heat absorbed by the cooler 104.
Specifically, an embodiment of the present invention provides a gas compression apparatus, including: the system comprises an air inlet pipeline 101, a filter 102, a first-stage reciprocating gas compression unit 103, a second-stage reciprocating gas compression unit 103, a third-stage reciprocating gas compression unit 103, a fourth-stage reciprocating gas compression unit 103, an exhaust pipeline 108, a cooler 104, a first automatic control valve 105, a second automatic control valve 106, a temperature transmitter 107 and a one-way valve 109.
The gas inlet pipeline 101, the filter 102, the first-stage reciprocating gas compression unit 103, the second-stage reciprocating gas compression unit 103, the third-stage reciprocating gas compression unit 103, the fourth-stage reciprocating gas compression unit 103 and the gas outlet pipeline 108 are sequentially connected in series through pipelines.
The first automatic control valve 105 is provided on the outlet line of the fourth stage reciprocating gas compression unit 103. The second automatic control valve 106 is disposed on the bypass line, and two ends of the bypass line are respectively connected to the outlet lines of the fourth-stage reciprocating gas compression unit 103, one end of the bypass line is located at the upstream of the first automatic control valve 105, and the other end of the bypass line is located at the downstream of the first automatic control valve 105.
The temperature transmitter 107 is disposed on the exhaust line 108, and is electrically connected to the first automatic control valve 105 and the second automatic control valve 106, and is configured to interlockingly control the opening degrees of the first automatic control valve 105 and the second automatic control valve 106, so that the sum of the opening degrees of the first automatic control valve 105 and the second automatic control valve 106 is 100%.
A check valve 109 is disposed on the exhaust line 108 downstream of the first self-control valve 105.
Therefore, the gas compression equipment provided by the embodiment of the invention can not only perform gas compression to pressurize the gas, but also perform automatic temperature control on the compressed gas to meet the use requirement. Specifically, the gas enters a filter 102 through an inlet line 101 for filtering, and the filtered gas enters a multi-stage reciprocating gas compression unit 103 connected in series for multi-stage compression to reach a desired pressure value. In this process, the gas compressed by each stage of reciprocating gas compression unit 103 has not only increased pressure but also increased temperature, and in order to ensure the safety of the subsequent compression operation and ensure that the temperature of the finally compressed gas is within a desired range, the gas compressed by each stage of reciprocating gas compression unit 103 is cooled by the cooler 104 and then enters the next stage of gas compression unit for recompression. After compressed gas passes through the fourth-stage reciprocating gas compression unit 103, any one of three temperature modes of normal-temperature gas injection, high-temperature gas injection and temperature-limited gas injection can be realized under the control of the first automatic control valve 105, the second automatic control valve 106 and the temperature transmitter 107, so that the high-temperature gas injection device has high automation control degree and high adaptability, and the adaptability to field production environments under complex terrains is remarkably improved.
The gas compression equipment provided by the embodiment of the invention can realize self-temperature-control gas injection of gas, such as nitrogen, at the temperature of 20-130 ℃, has high automation control degree, and is suitable for field production environment under complex terrain.
According to the gas compression equipment provided by the embodiment of the invention, the high-temperature and high-pressure gas is prepared by utilizing the heat generated by compressing work by the reciprocating type compression unit, so that the gas injection yield-increasing effect is improved, and meanwhile, extra energy consumption for producing fuel gas, electricity and the like is not brought.
On the other hand, the embodiment of the invention also provides a self-temperature-control gas injection system, wherein the self-temperature-control gas injection system adopts any one of the gas compression devices.
The automatic temperature control gas injection system provided by the embodiment of the invention is based on the gas compression equipment provided by the embodiment of the invention, and can realize the automatic temperature control of injected gas, so that the temperature of the injected gas reaches a desired value, a good gas injection effect is further obtained, and the adaptability to the field production environment under complex terrain is improved.
As an example, the temperature self-control gas injection system provided by the embodiment of the invention can be used in a coal-bed gas well to displace coal-bed gas adsorbed in a coal-bed gas reservoir, so as to achieve the purposes of coal-bed gas exploitation and yield increase. When used in a coal bed gas well, the injected gas may be nitrogen.
As an example, as shown in fig. 2, the self-temperature-controlling gas injection system according to the embodiment of the present invention further includes: a nitrogen production device 2, a gas production wellhead device 3 and a gas production pipe column 4;
the nitrogen production device 2, the gas compression equipment 1, the gas production wellhead device 3 and the gas production pipe column 4 are sequentially connected, and the gas production pipe column 4 is positioned in a casing of the coal bed gas well;
the gas production string 4 is provided with a packer 401, and the packer 401 is used for plugging an annular space between the gas production string 4 and the casing.
Specifically, the nitrogen generator 2 is connected to the gas intake line 101 of the gas compression facility 1, and the gas production wellhead 3 is connected to the gas discharge line 108 of the gas compression facility 1.
When the device is used, the nitrogen production device 2 produces nitrogen, the nitrogen is compressed by gas compression equipment until the temperature and the pressure meet the design requirements, and the nitrogen enters the gas production pipe column 4 from the gas production wellhead device 3 and is injected into a coal bed through the gas production pipe column to perform gas injection operation.
In the embodiment of the invention, the nitrogen making device 2 can be a PSA pressure swing adsorption nitrogen making machine, which can prepare nitrogen with the purity of 90-99.99% by taking ambient air as a raw material.
Based on the fact that the automatic temperature control gas injection system is used for gas injection operation of a coal bed gas well, in the embodiment of the invention, related pipelines can adopt high-temperature and high-pressure resistant hoses.
The gas production string 4 concerned is prepared using a thermally insulated tubing, for example, a D89 x 47N80 insulated tubing.
The gas production wellhead 3 concerned may be selected from KQ65-21MPa gas production wellheads conventionally used in the art.
The packer 401 concerned can be a compression type high temperature resistant packer of Y441-114mm, which realizes setting by means of pressing expansion.
Preferably, when the automatic temperature control gas injection system provided by the embodiment of the invention is used for gas injection operation, the bottom of the gas production pipe column 4 extends into the lower part of the coal bed gas reservoir; the distance between the bottom of the gas production string 4 and the bottom of the coal bed gas reservoir is 10-40 meters, for example, 10 meters, so as to ensure that the displaced coal bed gas can be collected smoothly.
Preferably, when the gas injection system with the self-temperature-control function provided by the embodiment of the invention is used for gas injection operation, the distance between the bottom of the packer 401 and the top of the coal bed methane reservoir is 10-20 meters, for example, 10 meters, so as to ensure that the packer 401 can smoothly block the oil jacket annulus after being set.
In order to facilitate the transfer of the self-temperature-control gas injection system and the use in the field environment, in the embodiment of the invention, the nitrogen generator 2 and the gas compression equipment 1 are skid-mounted.
Wherein, the skid-mounted type can be a dragging type skid-mounted type or a vehicle-mounted type skid-mounted type.
The automatic temperature control gas injection system provided by the embodiment of the invention can realize automatic temperature control gas injection of gas, such as nitrogen, at the temperature of 20-130 ℃, has high automation control degree, and is suitable for field production environment under complex terrain. The reciprocating type compression unit is used for compressing heat generated by doing work to prepare high-temperature and high-pressure gas, so that the gas injection yield-increasing effect is improved, and additional energy consumption for producing fuel gas, using electricity and the like is not brought.
In another aspect, an embodiment of the present invention further provides a temperature self-controlling gas injection method, where the temperature self-controlling gas injection method employs any one of the above temperature self-controlling gas injection systems.
Specifically, the method comprises the following steps: and (3) preparing nitrogen by using a nitrogen preparation device, compressing the nitrogen by using gas compression equipment until the temperature and the pressure meet the design requirements, and introducing the nitrogen into a gas production pipe column from a gas production wellhead device and injecting the nitrogen into a coal bed for gas injection operation.
Wherein, the temperature of the nitrogen gas of infusing has three kinds of temperature modes, includes respectively:
(1) normal temperature gas injection mode:
the opening degree of the first automatic control valve is adjusted to be fully opened (namely 100 percent), then the opening degree of the second automatic control valve is adjusted to be fully closed (namely 0 percent), and in the state, high-temperature and high-pressure gas, such as nitrogen, compressed by the last-stage reciprocating gas compression unit is cooled by a cooler, so that the gas temperature reaches the ambient temperature, and normal-temperature gas injection is realized.
Wherein, under this normal atmospheric temperature gas injection mode, can adjust the aperture of first automatic control valve and second automatic control valve through the manual work, also can adjust through temperature transmitter.
(2) High-temperature gas injection mode:
when the opening degree of the second automatic control valve is adjusted to be fully opened (namely 100%), the opening degree of the first automatic control valve is adjusted to be fully closed (namely 0%), high-temperature and high-pressure gas compressed by the last stage in the state directly enters the exhaust pipeline through the bypass pipeline, the gas temperature is approximately equal to the exhaust temperature of the reciprocating gas compression unit of the last stage, and the gas temperature range can be 100-130 ℃.
Wherein, under this high temperature gas injection mode, can adjust the aperture of first automatic control valve and second automatic control valve through the manual work, also can adjust through temperature transmitter.
(3) Temperature limiting gas injection mode:
in the temperature-limited gas injection mode, the opening degrees of the first automatic control valve and the second automatic control valve are adjusted through the temperature transmitter, namely, when the temperature transmitter detects that the temperature of gas compressed by the last-stage reciprocating gas compression unit is higher than a set temperature, the temperature transmitter sends an instruction to control the opening degree of the first automatic control valve to increase, and at the same time, the opening degree of the second automatic control valve is controlled to decrease in an interlocking manner, so that the temperature of the gas in the gas exhaust pipeline is reduced to reach the set temperature;
when the temperature transmitter detects that the temperature of the gas compressed by the last stage reciprocating gas compression unit is lower than a set temperature, the temperature transmitter sends an instruction to control the opening degree of the first automatic control valve to be reduced, and simultaneously, the opening degree of the second automatic control valve is controlled to be increased in an interlocking manner, so that the temperature of the gas in the gas exhaust pipeline is increased to reach the set temperature;
it can be understood that, when the temperature transmitter detects that the temperature of the gas compressed by the last-stage reciprocating gas compression unit is equal to the set temperature, the temperature transmitter does not transmit a command, and the opening degrees of the first and second self-control valves are maintained in the original states, respectively, so that the temperature of the gas in the exhaust line is maintained at the set temperature.
In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is meant to be illustrative of alternative embodiments of the disclosure and not to limit the disclosure, and any modification, equivalent replacement, or improvement made within the spirit and principles of the disclosure should be included within the scope of the disclosure.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A gas compression apparatus, characterized in that the gas compression apparatus comprises: the system comprises an air inlet pipeline, a filter, a multistage reciprocating gas compression unit, a cooler, a first automatic control valve, a second automatic control valve, a temperature transmitter and an exhaust pipeline, wherein the multistage reciprocating gas compression unit, the cooler, the first automatic control valve, the second automatic control valve, the temperature transmitter and the exhaust pipeline are connected in series;
the gas inlet line, the filter, the serially connected multi-stage reciprocating gas compression units, and the gas outlet line are connected in sequence by pipelines;
the first automatic control valve is arranged on an outlet pipeline of the gas compression unit at the last stage;
the second automatic control valve is arranged on a bypass pipeline, two ends of the bypass pipeline are respectively connected with an outlet pipeline of the last stage of gas compression unit, one end of the bypass pipeline is positioned at the upstream of the first automatic control valve, and the other end of the bypass pipeline is positioned at the downstream of the first automatic control valve;
the temperature transmitter is arranged on the exhaust pipeline, is respectively electrically connected with the first automatic control valve and the second automatic control valve, and is used for controlling the opening degrees of the first automatic control valve and the second automatic control valve in an interlocking manner, so that the sum of the opening degree of the first automatic control valve and the opening degree of the second automatic control valve is 100%;
the multistage reciprocating type gas compression unit shares one cooler, and gas compressed by the gas compression unit at the current stage is cooled by the cooler and then is input into the gas compression unit at the next stage.
2. The gas compression apparatus of claim 1, wherein a relief valve is provided in the outlet line of each stage of the gas compression unit.
3. The gas compression apparatus of claim 1, wherein the discharge line is provided with a one-way valve.
4. The gas compression device as claimed in claim 1, wherein the gas compression unit is provided with four stages.
5. A self-temperature-controlling gas injection system, wherein the self-temperature-controlling gas injection system employs a gas compression apparatus as claimed in any one of claims 1 to 4.
6. The self temperature controlling gas injection system of claim 5, further comprising: a nitrogen production device, a gas production wellhead device and a gas production pipe column;
the nitrogen production device, the gas compression equipment, the gas production wellhead device and the gas production pipe column are sequentially connected, and the gas production pipe column is positioned in a casing of the coal bed gas well;
and a packer is arranged on the gas production pipe column and used for plugging an annular space between the gas production pipe column and the sleeve.
7. The self-temperature-control gas injection system according to claim 6, wherein the bottom of the gas production pipe column extends below the coal bed methane reservoir;
the distance between the bottom of the gas production pipe column and the bottom of the coal bed gas reservoir is 10-40 meters.
8. The self temperature controlling gas injection system of claim 7, wherein the distance between the bottom of the packer and the top of the coalbed methane reservoir is 10-20 meters.
9. The self-temperature-controlling gas injection system according to claim 6, wherein the nitrogen generator and the gas compressor are skid-mounted.
10. A self temperature controlling gas injection method, wherein the self temperature controlling gas injection method employs the self temperature controlling gas injection system according to any one of claims 6 to 9.
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Application publication date: 20210928 |