CN109681780B - Complete gas well supercharging system based on reciprocating compressor and operation method - Google Patents
Complete gas well supercharging system based on reciprocating compressor and operation method Download PDFInfo
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- CN109681780B CN109681780B CN201910128686.5A CN201910128686A CN109681780B CN 109681780 B CN109681780 B CN 109681780B CN 201910128686 A CN201910128686 A CN 201910128686A CN 109681780 B CN109681780 B CN 109681780B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 78
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 78
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 78
- 230000006835 compression Effects 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 45
- 238000005406 washing Methods 0.000 claims abstract description 29
- 239000012071 phase Substances 0.000 claims abstract description 9
- 239000007791 liquid phase Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 59
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 28
- 239000003345 natural gas Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000011143 downstream manufacturing Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 description 5
- 239000002343 natural gas well Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Jet Pumps And Other Pumps (AREA)
- Compressor (AREA)
Abstract
The invention discloses a complete gas well supercharging system based on a reciprocating compressor and an operation method thereof, wherein the system comprises a well stream processing module and a compressor unit module, wherein: the well stream material treatment module comprises a slug flow capturing tank, a high-efficiency separator, a low-pressure liquid hydrocarbon tank and a hydrocarbon liquid lifting pump, wherein a gas phase outlet of the slug flow capturing tank is connected with the high-efficiency separator, and a liquid phase outlet is respectively connected with the low-pressure liquid hydrocarbon tank and the hydrocarbon liquid lifting pump; the compressor unit module comprises at least two stages of compression, and each stage of compression comprises a washing tank, a reciprocating compressor and an air cooler which are connected in sequence. When the pressure of the high-yield gas well is exhausted, the gas and the liquid phases in the well flow are safely and effectively separated, the gas phase enters the reciprocating compressor unit for pressurization, the liquid phase is converged into the gas phase outlet of the compressor after being pressurized by the hydrocarbon liquid lifting pump, and the conventional complex pressurization station system is simplified into two modules, so that the production requirements of quick production, easy moving and repeated utilization are realized.
Description
Technical Field
The invention relates to a complete gas well pressurization system based on a reciprocating compressor and an operation method thereof, belonging to the technical field of gas field exploitation.
Background
When the pressure of the high-yield gas well is attenuated to the pressure of the gathering and transporting system, natural gas of the gas well can be rapidly and deeply extracted by pressurizing at a well site, and the development benefit of the gas well is greatly improved. Conventionally, centralized pressurization is generally performed in a gas field center of a plurality of wells, and the method is only suitable for treating single wells with relatively uniform pressure attenuation degrees of the gas wells. For the situations of large difference of the attenuation degree of the single well of the gas field and distributed dispersion, the optimal solution is to boost pressure at the well site.
In the natural gas well attenuation exploitation period, the gas well yield and pressure change amplitude are large, and the conditions of liquid and solid impurities in the produced well flow are complex. If the pressure boosting exploitation is carried out according to the conventional construction method of the gas compressing station, a gas compressing station comprising a compressor set, a raw gas pretreatment facility and a hydrocarbon liquid pipe conveying or pulling facility needs to be constructed, the construction cost is high, the construction period is long, the moving difficulty is high, and the overall development benefit is low. The complete gas well pressurizing system with modularized and skid-mounted gas compression stations can be rapidly produced, the automation degree is high, and the repeated utilization is convenient, so that the comprehensive benefit is improved.
At present, screw compressors are adopted for complete sets of well site supercharging devices integrating compressor sets and matched process facilities at home and abroad, and the following problems exist:
1. the screw compressor adopted by the complete device has lower discharge capacity and can not meet the pressurizing requirement of a high-yield gas well.
2. The discharge pressure of the screw compressor is generally not more than 6.3MPa, and the requirement of about 10MPa for collecting and conveying pressure cannot be met.
Only the reciprocating compressor can meet the working conditions of high discharge capacity, high discharge pressure and high pressure ratio in the attenuation exploitation process of the high-yield gas well, but the reciprocating compressor has complex equipment and high matching requirements, and a complete set of supercharging system which is based on the reciprocating compressor and can adapt to the full attenuation period development of the gas well is not yet available.
At present, the reciprocating compressor station generally only supplies the compressor, the engine and the auxiliary device of the unit into a skid, and technical progress of integrating the air cooler on the skid of the compressor has also appeared in recent years, but slug flow capturing equipment, a gas-liquid separator, a filtering separator, hydrocarbon liquid storage, hydrocarbon liquid post-treatment, other auxiliary process facilities and the like are independently designed and built according to specific conditions, the construction period is long, the equipment universality is poor, the repeated use is inconvenient, and the efficiency is not high and the economic effect is not high for the natural gas well attenuation exploitation with the use time of 2-3 years.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a complete gas well supercharging system based on a reciprocating compressor and an operation method thereof, which can solve the supercharging requirement in the full decay period in the later development period of a high-yield gas well, and can be quickly produced, and is easy to move and recycle.
The technical scheme adopted by the invention is as follows: a reciprocating compressor-based gas well pressurization system comprising a well stream processing module and a compressor train module, wherein: the well stream material treatment module comprises a slug flow capturing tank, a high-efficiency separator, a low-pressure liquid hydrocarbon tank and a hydrocarbon liquid lifting pump, wherein a gas phase outlet of the slug flow capturing tank is connected with the high-efficiency separator, and a liquid phase outlet is respectively connected with the low-pressure liquid hydrocarbon tank and the hydrocarbon liquid lifting pump; the compressor unit module comprises at least two stages of compression, and each stage of compression comprises a washing tank, a reciprocating compressor and an air cooler which are connected in sequence; an interstage cut-off valve is arranged between an air cooler in the previous stage of compression and a washing tank in the next stage of compression, a one-stage cut-off valve is arranged between an inlet of the washing tank in the first stage of compression and the downstream of the interstage cut-off valve, and a current-stage cut-off valve is arranged between outlets of the air coolers in the two stages of compression; the reciprocating compressors of each stage of compression are connected with the driving machine, and a reflux valve is arranged between an inlet of the first stage of compression and an outlet of the final stage of compression; the gas phase outlet of the high-efficiency separator is connected with the inlet of a washing tank of the first-stage compression, the outlet of the washing tank of the first-stage compression is connected with a low-pressure liquid hydrocarbon tank through a stop valve, and the outlets of washing tanks of the second-stage compression and higher-stage compression are respectively connected with the low-pressure liquid hydrocarbon tank and a slug flow trapping tank through stop valves.
The invention also provides an operation method of the complete gas well pressurizing system based on the reciprocating compressor, wherein the wellhead natural gas firstly enters a well stream processing module, is pre-separated by a slug flow capturing tank, and then enters a high-efficiency separator to remove liquid drops and solid impurities; then natural gas enters a compressor unit module for pressurization, and the pressurized natural gas is connected to a gas transmission pipe network; the liquid separated by the slug flow capturing tank and the high-efficiency separator is pressurized by adopting a hydrocarbon liquid lifting pump and then is connected to an outlet of a compressor unit module, and is conveyed to a downstream processing system together with natural gas; the operation mode of the compressor unit module is as follows: when the gas well has higher pressure and smaller pressure ratio and has higher requirement on yield, the compressors of all stages are operated in parallel; when the gas well pressure is low and the pressure ratio is high, the compressors of each stage are operated in series.
Compared with the prior art, the invention has the following positive effects:
when the pressure of the high-yield gas well is exhausted, the gas and the liquid phases in the well flow are safely and effectively separated, the gas phase enters the reciprocating compressor unit for pressurization, the liquid phase is converged into the gas phase outlet of the compressor after being pressurized by the hydrocarbon liquid lifting pump, and the conventional complex pressurization station system is simplified into two modules, so that the production requirements of quick production, easy moving and repeated utilization are realized. The invention integrates the complex reciprocating compressor for pressurizing the gas well and the matched process system into a complete system for the first time. The modularized and skid-mounted complete gas well pressurizing system can rapidly and deeply extract reserves in a gas well, has high automation degree and is convenient for repeated use, thereby improving the comprehensive benefit of gas well development.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a gas well pressurization system based on a reciprocating compressor according to the present invention, wherein the compressor is illustrated by two-stage compression.
Detailed Description
A reciprocating compressor-based gas well pressurization system, as shown in fig. 1, comprising: a well stream inlet short pipe 1, an automatic shut-off valve 2, an automatic regulating valve 3, a slug flow capturing tank 4, a high-efficiency separator 5, a primary wash tank 6, a primary compression 7, a primary air cooler 8, a shut-off valve 9, a secondary wash tank 10, a secondary compression 11, a secondary air cooler 12, a check valve 13, an automatic shut-off valve 14, a shut-off valve 15, a shut-off valve 16, an automatic blow-off valve 17, a shut-off valve 18, a hydrocarbon liquid lift pump 19, a check valve 20, an automatic shut-off valve 21, a shut-off valve 22, a shut-off valve 23, a shut-off valve 24, a low-pressure hydrocarbon liquid tank 25, a shut-off valve 26, an automatic pressure reducing valve 27, an automatic shut-off valve 28, a PLC29, a driving machine 30, a reflux valve 31, and the like, wherein:
the automatic shut-off valve 2, the automatic regulating valve 3, the slug capturing tank 4, the high-efficiency separator 5, the shut-off valve 18, the hydrocarbon liquid lift pump 19, the check valve 20, the automatic shut-off valve 21, the shut-off valve 22, the shut-off valve 23, the shut-off valve 24, the low-pressure hydrocarbon liquid tank 25, the shut-off valve 26, the automatic pressure reducing valve 27, the automatic shut-off valve 28 and the like constitute a well stream processing module. The well stream processing module completes the functions of wellhead raw gas liquid removal, dust removal, hydrocarbon liquid buffering, storage and pressurization. The slug flow trapping tank is a horizontal pressure vessel and is used for well flow pre-separation and short-time buffering of a large amount of incoming liquid. And high-efficiency internal components are arranged in the high-efficiency separator, so that dust and liquid drops in the natural gas are reduced to the acceptable limit of the reciprocating compressor. The low-pressure hydrocarbon liquid tank is used for collecting hydrocarbon liquid which cannot enter the slug flow trapping tank, and also can buffer hydrocarbon liquid which cannot be received by the slug flow trapping tank, and the pressure of the low-pressure hydrocarbon liquid tank is controlled by adopting an automatic pressure reducing valve 27, so that the low-pressure hydrocarbon liquid can enter the slug flow trapping tank and keep the pressure as much as possible. A pressure control valve (an automatic shut-off valve 2 and an automatic regulating valve 3) is arranged on the well fluid inlet short pipe 1; the well stream processing module is provided with a gas-liquid pre-separation and high-efficiency separation combined system; the well flow sequentially enters a slug flow trapping tank and a high-efficiency separator and then is connected with a compressor inlet of a compressor unit module; a liquid phase outlet of a slug flow capturing tank in the well stream object treatment module is connected with a hydrocarbon liquid lifting pump and a low-pressure hydrocarbon liquid tank, an outlet of the hydrocarbon liquid lifting pump is connected with a compressor outlet, and an outlet of the low-pressure hydrocarbon liquid tank is connected with the hydrocarbon liquid lifting pump; the slug flow trapping tank and the low-pressure hydrocarbon liquid tank are provided with liquid level detection instruments, and the starting and stopping of the hydrocarbon liquid lifting pump are controlled according to the detected liquid level. The well stream processing module is integrally integrated on one sledge, and the slug flow capturing tank, the high-efficiency separator, the low-pressure hydrocarbon liquid tank and the hydrocarbon liquid lifting pump are fixed on the same sledge seat, so that the construction, the installation and the reuse are convenient.
The compressor unit module is composed of a first-stage washing tank 6, a first-stage compression 7, a first-stage air cooler 8, a cut-off valve 9, a second-stage washing tank 10, a second-stage compression 11, a second-stage air cooler 12, a check valve 13, an automatic cut-off valve 14, a cut-off valve 15, a cut-off valve 16, an automatic emptying valve 17, a PLC29, a driver 30, a reflux valve 31 and the like. The two-stage compression is realized in the compressor unit module through switching of three cut-off valves 9, 15 and 16 and is connected in parallel to one-stage compression or two-stage compression is maintained. The compressor unit module is integrally integrated on one sledge, and the reciprocating compressor, the driving machine, the air cooler and the compressor unit auxiliary equipment are integrally fixed on the same sledge seat, so that the installation, debugging and commissioning test running time of the compressor unit are effectively saved, and the reciprocating compressor unit is convenient to move and reuse. The compressors in the compressor unit modules have various working conditions and flow regulation measures, including serial or parallel use of multistage compression, single-action or double-action mode of the cylinders of the compressors, clearance regulation of the cylinders of the compressors and rotation speed regulation of the compressors; the liquid discharged from the primary washing tank in the compressor unit module is connected to the low-pressure hydrocarbon liquid tank of the well stream processing module, and the liquid discharged from the secondary washing tank and the higher washing tank is connected to the slug flow trapping tank or the low-pressure hydrocarbon liquid tank.
After the well stream treatment module, the liquid discharge amount of the primary washing tank 6 of the compressor is very low, but the liquid discharge amount of the secondary washing tank 10 is relatively high, the pressure of the primary washing tank 6 is lower than that of the slug flow capturing tank 4, and the primary washing tank 6 cannot enter the slug flow capturing tank 4, so that the primary washing tank can enter the low-pressure hydrocarbon liquid tank 25 through the cut-off valve 22 for storage. The liquid discharged from the secondary washing tank 10 is discharged into a slug flow trapping tank through a stop valve 24; when the secondary compression of the compressor is reduced to the primary use, the liquid discharged from the secondary washing tank 10 enters the low-pressure hydrocarbon liquid tank 25 through the stop valve 23 for storage. Therefore, a large amount of hydrocarbon liquid is received by the slug flow capturing tank and is automatically discharged outwards through the hydrocarbon liquid lifting pump 19, and a small amount of hydrocarbon liquid is collected by the low-pressure hydrocarbon liquid tank, so that the liquid discharge period of the low-pressure hydrocarbon liquid tank is effectively prolonged.
The well stream processing module and the compressor unit module are subjected to unified combined control by the PLC29, so that the compressor is ensured to run under the allowed working condition. When the well head incoming gas can not meet the safe operation requirement of the compressor or the well fluid treatment function is insufficient, the inlet cut-off valve 2 and the outlet cut-off valves 14 and 21 of the whole complete system are cut off, so that the safety of the pressurizing system, particularly the compressor, is ensured. When the supercharging system is suddenly shut down, the system is depressurized through the automatic vent valve 17.
When the pressure of the natural gas well is insufficient or the production is required to be increased, the two modules of the complete pressurizing system are moved to the well site. The wellhead natural gas firstly enters a well stream processing module, is pre-separated by a slug flow capturing tank, and then enters a high-efficiency separator to remove liquid drops and solid impurities. Then the natural gas enters a compressor for pressurization, and the pressurized natural gas is connected to a gas transmission pipe network. The liquid separated by the slug flow capturing tank and the high-efficiency separator is pressurized by adopting a hydrocarbon liquid lifting pump and then is connected to the outlet of the compressor, and is conveyed to a downstream processing system together with natural gas. When the gas well production is lower than the pressurization capability of the compressor when the cylinders are dual-acting, the cylinders can be set to a single-acting mode to reduce the compressor displacement.
When the well stream is too much in transient fluid, the slug capturing tank reaches the control level, the automatic shut-off valve 28 is opened and buffering is performed by the low pressure hydrocarbon tank. The pressure in the low-pressure hydrocarbon liquid tank is controlled by an automatic pressure reducing valve 27, and the outlet of the automatic pressure reducing valve 27 is diffused or enters a torch for burning.
The starting and stopping of the hydrocarbon liquid lifting pump 19 are automatically controlled through the liquid level of the slug flow capturing tank 4, the high liquid level starts the pump, and the low liquid level stops the pump. When the low-pressure hydrocarbon liquid tank 25 reaches a high liquid level, the shut-off valve 18 is closed, the shut-off valve 26 is opened, and the pump is manually started to reduce the liquid level of the low-pressure hydrocarbon liquid tank 25 to a low liquid level value.
The specific implementation strategy of the complete gas well pressurization system based on the reciprocating compressor is as follows in different stages of the natural gas well decay production cycle.
1. When the gas well pressure is higher and the pressure ratio is smaller and the production requirement is higher, the two-stage compressors of the compressor are connected in parallel to be operated as one stage:
closing the cut-off valve 9, opening the cut-off valves 15 and 16, and running the primary compression 7 and the secondary compression 11 in parallel; the displacement of the compressor unit is regulated through the rotation speed of the engine; the inlet pressure of the compressor unit module is controlled to be not lower than the minimum value for guaranteeing the safe operation of the compressor unit through the reflux valve 31. When the gas treatment amount is regulated stepwise, the cylinder of the compressor can regulate the displacement of the compressor in a single-acting or double-acting mode.
The liquid discharge amount of the primary washing tank 6 in the compressor unit module is small, and the liquid discharged by the primary washing tank 6 enters the low-pressure hydrocarbon liquid tank 25 through the stop valve 22; the shut-off valve 23 is opened and the shut-off valve 24 is closed, and the drain of the secondary wash tank 10 is connected to a low pressure hydrocarbon liquid tank 25. The low pressure hydrocarbon tank 25 is a long period manual drain. When the low-pressure hydrocarbon liquid tank 25 reaches a high liquid level, the shut-off valve 18 is closed, the shut-off valve 26 is opened, and the hydrocarbon liquid lift pump 19 is manually started to lower the liquid level of the low-pressure hydrocarbon liquid tank 25 to a low liquid level value. When the pressure in the low-pressure hydrocarbon liquid tank 25 exceeds the pressure set value, the automatic pressure reducing valve 27 is opened, and the discharged air is diffused through the outlet of the automatic pressure reducing valve 27 or enters a flare for combustion.
The slug flow trapping tank is used for automatically discharging liquid in a short period. When the slug flow capturing tank 4 is at a high liquid level, the hydrocarbon liquid lifting pump 19 is started automatically; when the slug flow capturing tank 4 is at a low liquid level, the hydrocarbon liquid lifting pump 19 stops running automatically; when the well stream is excessively carried with liquid instantaneously, and the slug flow capturing tank 4 is at a high liquid level, the automatic cut-off valve 28 is opened, and the hydrocarbon liquid flows into the low-pressure hydrocarbon liquid tank 25 for buffering; when the slug flow trapping tank 4 is at the limit high liquid level, the compressor unit PLC29 controls the system to stop, the automatic shut-off valve 2, the automatic shut-off valve 14, the automatic shut-off valve 21 and the automatic shut-off valve 28 are all shut off, all the equipment stops running, the automatic emptying valve 17 is opened for decompression, and the emptying air enters the torch for burning.
2. When the gas well pressure is lower and the pressure ratio is higher, the compressor is in two-stage compression operation:
opening the cut-off valve 9, closing the cut-off valves 15 and 16, and operating the primary compression 7 and the secondary compression 11 in series; the displacement of the compressor unit is regulated through the rotation speed of the engine; controlling the inlet pressure of the compressor unit module to be not lower than the lowest value for guaranteeing the safe operation of the compressor through the reflux valve 31; the inlet pressure of the compressor is controlled to be not higher than the highest value for guaranteeing the safe operation of the compressor through the automatic regulating valve 3. When the gas treatment amount is regulated stepwise, the cylinder of the compressor can regulate the displacement of the compressor in a single-acting or double-acting mode.
The liquid discharge amount of the primary washing tank 6 in the compressor unit module is small, and the liquid discharged by the primary washing tank 6 enters the low-pressure hydrocarbon liquid tank 25 through the stop valve 22; the shut-off valve 23 is closed and the shut-off valve 24 is opened, the drain of the secondary wash tank 10 being connected to the slug capturing tank 4.
The automatic liquid discharge mode of the slug flow capturing tank and the manual liquid discharge mode of the low-pressure hydrocarbon liquid tank and the emergency shutdown processing mode of the pressurizing system are the same as the mode of the first-stage working condition in parallel connection.
Claims (7)
1. A complete set gas well pressurization system based on reciprocating compressor, its characterized in that: including well stream processing module and compressor unit module, wherein: the well stream material treatment module comprises a slug flow trapping tank, a high-efficiency separator, a low-pressure hydrocarbon liquid tank and a hydrocarbon liquid lifting pump, wherein a gas phase outlet of the slug flow trapping tank is connected with the high-efficiency separator, and a liquid phase outlet is respectively connected with the low-pressure hydrocarbon liquid tank and the hydrocarbon liquid lifting pump; the compressor unit module comprises at least two stages of compression, and each stage of compression comprises a washing tank, a reciprocating compressor and an air cooler which are connected in sequence; an interstage cut-off valve is arranged between an air cooler in the previous stage of compression and a washing tank in the next stage of compression, a one-stage cut-off valve is arranged between an inlet of the washing tank in the first stage of compression and the downstream of the interstage cut-off valve, and a current-stage cut-off valve is arranged between outlets of the air coolers in the two stages of compression; the reciprocating compressors of each stage of compression are connected with the driving machine, and a reflux valve is arranged between an inlet of the first stage of compression and an outlet of the final stage of compression; the gas phase outlet of the high-efficiency separator is connected with the inlet of a washing tank of the first-stage compression, the outlet of the washing tank of the first-stage compression is connected with a low-pressure hydrocarbon liquid tank through a stop valve, and the outlets of the washing tanks of the second-stage compression and the higher-stage compression are respectively connected with the low-pressure hydrocarbon liquid tank and a slug flow trapping tank through stop valves; the outlet of the final stage compression and the outlet of the hydrocarbon liquid lifting pump are connected into a downstream processing system through a check valve and an automatic cut-off valve; an automatic shut-off valve and an automatic regulating valve are arranged on a well stream inlet short pipe of the slug flow capturing tank.
2. A reciprocating compressor-based gas well pressurization system according to claim 1, wherein: and liquid level detection instruments are arranged in the slug flow trapping tank and the low-pressure hydrocarbon liquid tank and are used for controlling the start and stop of the hydrocarbon liquid lifting pump according to the detected liquid level.
3. A reciprocating compressor-based gas well pressurization system according to claim 1, wherein: the slug flow trapping tank, the high-efficiency separator, the low-pressure hydrocarbon liquid tank and the hydrocarbon liquid lifting pump of the well stream processing module are fixed on the same skid base.
4. A reciprocating compressor-based gas well pressurization system according to claim 1, wherein: the reciprocating compressor, the driving machine, the air cooler and the auxiliary equipment of the compressor unit are integrally fixed on the same skid seat.
5. A reciprocating compressor-based gas well pressurization system according to claim 1, wherein: the well stream processing module and the compressor unit module are subjected to unified combined control by a PLC.
6. A method for operating a complete gas well pressurization system based on a reciprocating compressor is characterized in that: the natural gas at the wellhead firstly enters a well stream processing module, is pre-separated by a slug flow capturing tank, and enters a high-efficiency separator to remove liquid drops and solid impurities; then natural gas enters a compressor unit module for pressurization, and the pressurized natural gas is connected to a gas transmission pipe network; the liquid separated by the slug flow capturing tank and the high-efficiency separator is pressurized by adopting a hydrocarbon liquid lifting pump and then is connected to an outlet of a compressor unit module, and is conveyed to a downstream processing system together with natural gas; the operation mode of the compressor unit module is as follows: when the gas well has higher pressure and smaller pressure ratio and has higher requirement on yield, the compressors of all stages are operated in parallel; when the gas well pressure is low and the gas well pressure is high, the compressors of all stages are operated in series; connecting the liquid discharge of the two or more stage wash tanks to a low pressure hydrocarbon liquid tank when the compressors of the stages are connected in parallel; connecting the liquid discharge of the two or more stage wash tanks to a slug flow capturing tank when the compressors of each stage are connected in series; when the well fluid is excessively carried out instantaneously and the slug flow trapping tank reaches the control liquid level, the low-pressure hydrocarbon liquid tank is used for buffering, and the pressure in the low-pressure hydrocarbon liquid tank is controlled through an automatic pressure reducing valve.
7. A method of operating a reciprocating compressor based gas well pressurization system of the type set forth in claim 6, wherein: when compressors at all stages are operated in parallel, the displacement of the compressors is regulated through the rotation speed of the engine; controlling the inlet pressure of the compressor to be not lower than the minimum value for guaranteeing the safe operation of the compressor through a reflux valve; when the compressors of all stages are operated in series, the displacement of the compressors is regulated through the rotation speed of the engine; controlling the inlet pressure of the compressor to be not lower than the minimum value for guaranteeing the safe operation of the compressor through a reflux valve; and controlling the inlet pressure of the compressor to be not higher than the highest value for guaranteeing the safe operation of the compressor through the automatic regulating valve.
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