CN216952639U - Oil field associated gas recovery liquid ring multistage compressor system - Google Patents
Oil field associated gas recovery liquid ring multistage compressor system Download PDFInfo
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- CN216952639U CN216952639U CN202220620221.9U CN202220620221U CN216952639U CN 216952639 U CN216952639 U CN 216952639U CN 202220620221 U CN202220620221 U CN 202220620221U CN 216952639 U CN216952639 U CN 216952639U
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Abstract
The utility model provides an oil field associated gas recovery liquid ring multistage compressor system, which comprises N groups of single-stage liquid ring compressor units which are connected in series from front to back, wherein N is more than or equal to 2; each single-stage liquid ring compressor unit comprises a liquid ring compressor, a steam-water separator, a heat exchanger and a control module; a partition plate is arranged in the steam-water separator and divides the lower part of the steam-water separator into a water return cavity and an oil discharge cavity, a water return cavity liquid level transmitter is arranged on one side of the water return cavity, an oil discharge cavity liquid level transmitter is arranged on one side of the oil discharge cavity, and an automatic switch valve is arranged at the outlet of the oil discharge cavity; the exhaust port of the liquid ring compressor is communicated with the suction inlet of the steam-water separator, the water outlet of the water return cavity is communicated with the water inlet of the heat exchanger, and the water outlet of the heat exchanger is communicated with the water supply port of the liquid ring compressor. The oil field associated gas recovery liquid ring multistage compressor system has the advantages of large air extraction amount, safety, reliability, energy conservation and environmental protection, and can meet the requirements of different oil field working conditions.
Description
Technical Field
The utility model belongs to the technical field of oilfield associated gas recovery, and particularly relates to a multistage liquid ring compressor system for oilfield associated gas recovery.
Background
The recovery process of oil field associated gas, namely low-pressure natural gas which is generated or generated in the process of exploiting the oil field, needs to be conveyed by using a liquid ring compressor to ensure the safety of the conveying process due to the inflammability and explosiveness and the moisture and crude oil content. More precisely, the oilfield associated gas is conveyed by a liquid ring compressor unit which consists of a liquid ring compressor, a gas-liquid separator, a heat exchanger and the like. At present, most of liquid ring compressor units used in oil fields are single-stage liquid ring compressor units. The single-stage liquid ring compressor unit is a liquid ring compressor unit which consists of a liquid ring compressor, a gas-liquid separator, a heat exchanger and other equipment. Because the difference of gas conveying working conditions required by different oil fields is large, and the limit discharge pressure of the existing single liquid ring compressor is only 0.7MPa, when the conveying pressure required by associated gas of the oil field is more than 0.7MPa, the existing single-stage liquid ring compressor unit is difficult to meet the requirements.
Disclosure of Invention
The utility model aims to solve the problems of gas transportation, recovery, gas-liquid separation and crude oil recovery when the transportation pressure of associated gas in an oil field is more than 0.7MPa, and the aim is realized by the following technical scheme:
a liquid ring multistage compressor system for recovering associated gas in an oil field comprises N groups of single-stage liquid ring compressor units which are connected in series from front to back, wherein N is more than or equal to 2; each group of single-stage liquid ring compressor units comprises a liquid ring compressor, a steam-water separator, a heat exchanger and a control module; a partition plate is arranged in the steam-water separator, the lower part of the steam-water separator is divided into a water return cavity and an oil discharge cavity, a water return cavity liquid level meter is arranged on one side of the water return cavity, an oil discharge cavity liquid level transmitter is arranged on one side of the oil discharge cavity, and an automatic switch valve is arranged at the outlet of the oil discharge cavity; the oil discharge cavity liquid level transmitter and the automatic switch valve are in communication connection with the control module; an exhaust port of the liquid ring compressor is communicated with a suction inlet of the steam-water separator, a water outlet of the water return cavity is communicated with a water inlet of the heat exchanger, and a water outlet of the heat exchanger is communicated with a water supply port of the liquid ring compressor; the exhaust port of the steam-water separator in the single-stage liquid ring compressor unit positioned at the front end is communicated with the suction inlet of the liquid ring compressor in the single-stage liquid ring compressor unit positioned at the adjacent rear end, and the oil discharge cavity of the steam-water separator positioned at the front end is communicated with the suction inlet of the liquid ring compressor positioned at the adjacent rear end; the suction inlet of a liquid ring compressor in the first-stage liquid ring compressor unit positioned at the foremost end is communicated with an air inlet pipeline outside the system; and an exhaust port of a steam-water separator in the N-stage liquid ring compressor unit positioned at the tail end is communicated with an exhaust pipeline outside the system, and an oil discharge cavity of the steam-water separator is communicated with an oil storage container outside the system.
It should be noted that, for simplicity and convenience of the description, the liquid ring compressor set located at the frontmost end is referred to as a first-stage liquid ring compressor set, the liquid ring compressor, the gas-liquid separator and the heat exchanger in the first-stage liquid ring compressor are referred to as a first-stage liquid ring compressor, a first-stage gas-liquid separator and a first-stage heat exchanger respectively, correspondingly, the liquid ring compressor set located at the adjacent rear end of the first-stage liquid ring compressor set is referred to as a second-stage liquid ring compressor set, relevant devices therein are referred to as a second-stage liquid ring compressor, a second-stage gas-liquid separator and a second-stage heat exchanger respectively, when N is greater than 2, the process is repeated, that is, the liquid ring compressor set located at the frontmost end is referred to as an nth-stage liquid ring compressor set, and relevant devices therein are referred to as an nth-stage liquid ring compressor, an nth-stage gas-liquid separator and an nth-stage heat exchanger respectively.
The technical solution of the present invention is described above from the perspective of system structure, and the working method thereof is further described below.
The working method comprises the working steps of realizing the separation of associated gas and liquid in the associated gas of the oil field and the separation of moisture in the liquid and crude oil step by step from the first-stage liquid ring compressor unit to the Nth-stage liquid ring compressor unit, and recycling the separated moisture as the working water of the liquid ring compressor at the same stage until the crude oil is recovered and the associated gas is discharged out of the system for subsequent treatment. The method is embodied by the following steps:
step one, a first-stage liquid ring compressor sucks associated gas from an oil field, the associated gas carries water, crude oil is compressed in the first-stage liquid ring compressor and then discharged into a first-stage steam-water separator to carry out first separation of gas and liquid, the separated gas (still containing partial crude oil and water) is discharged into a suction inlet of a second-stage liquid ring compressor, most of the separated crude oil and water are deposited in a water return cavity of the first-stage steam-water separator, when the water return cavity is filled with liquid, crude oil floating on the water return cavity overflows into an oil discharge cavity, so that separation of the crude oil and the water is realized, the separated water is discharged from a water discharge port of the water return cavity and is cooled by a heat exchanger to be used as working water and then returned into the first-stage liquid ring compressor for use;
step two, when the oil level in the oil discharge cavity reaches a set oil level, the oil discharge cavity liquid level transmitter sends a signal to the control module, the control module sends an instruction to open the automatic switch valve and discharge the oil in the oil discharge cavity to the suction inlet of the second-stage ring compressor, and when the oil level in the oil discharge cavity is reduced to the set minimum oil level, the control module sends an instruction according to the signal sent by the oil cavity liquid level transmitter and closes the automatic switch valve;
step three, the following two cases are divided:
firstly, if the oil field associated gas recovery liquid ring multistage compressor system is composed of two groups of single-stage liquid ring compressor units, namely N is 2, the associated gas and crude oil which are subjected to primary separation in the previous step enter a second-stage liquid ring compressor, then are subjected to secondary compression by the second-stage liquid ring compressor and then are discharged into a second-stage steam-water separator, so that secondary separation of gas and liquid is realized, at the moment, the associated gas is compressed to the pressure required by the recovery process, the associated gas is discharged from an exhaust port of the second-stage steam-water separator and enters the next processing process, the crude oil floats on the liquid in a water return cavity, after the liquid in the water return cavity is returned, the crude oil overflows and falls into an oil discharge cavity of the second-stage steam-water separator, and because the pressure in the steam-water separator is higher, when the oil level in the oil discharge cavity of the steam-water separator reaches the set oil level, a liquid level transmitter of the oil discharge cavity sends a signal to a control module, the control module sends out an instruction, opens the automatic switch valve, conveys the crude oil in the oil discharge cavity to an oil storage container outside the system, and closes the oil discharge valve when the oil level of the oil discharge cavity is reduced to a set minimum oil level;
secondly, if the oil field associated gas recovery liquid ring multistage compressor system is composed of more than 3 single-stage liquid ring compressor units, namely N is more than or equal to 3, the second-stage liquid ring compressor, the second-stage steam-water separation and the second-stage heat exchanger repeat the work of the first-stage liquid ring compressor, the first-stage steam-water separation and the first-stage heat exchanger, the gas and the crude oil which are separated for the second time are conveyed to the third-stage liquid ring compressor and the third-stage steam-water separator for processing, and the like until the Nth-stage steam-water separator discharges the associated gas which is separated for the Nth time, the associated gas enters the next processing flow, and the crude oil which is recovered by an oil discharge cavity is conveyed to an oil storage container outside the system.
The utility model has the following main beneficial effects:
firstly, the two stages of the limit discharge pressure can reach 1.4MPa, the three stages can reach 2.1MPa, and in addition, the multi-stage compressor can be matched with different compressors to suck gas quantity far larger than that of a single-stage compressor, so that the requirements of different oil field working conditions can be met;
and secondly, associated gas is recovered, and simultaneously, crude oil carried by the associated gas can be separated and conveyed to an oil storage container arranged outside the system without additionally arranging an oil conveying pump for conveying, so that the energy is saved, the convenience is realized, and meanwhile, the crude oil cannot be accumulated in the compressor.
Thirdly, the working liquid is recycled in the liquid ring compressor, and no pollutant is discharged.
Drawings
FIG. 1 is a schematic diagram of the structure and operation of an embodiment of the present invention;
in the figure:
1-liquid ring compressor; 2-steam-water separator;
201-water return cavity in steam-water separator;
202-oil drainage chamber in steam-water separator;
3-oil discharge cavity liquid level transmitter;
4-water return cavity liquid level meter; 5-heat exchanger;
6-automatic regulating valve; and 7-control module.
Detailed Description
In order that those skilled in the art will more fully understand the present invention, an embodiment of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1, the oil field associated gas recovery liquid ring multistage compressor system includes two sets of single-stage liquid ring compressor units connected in series from front to back, the liquid ring multistage compressor unit located at the front end is also referred to as a first-stage liquid ring compressor unit, and the liquid ring multistage compressor unit located at the back end is also referred to as a second-stage liquid ring compressor unit. Each single-stage liquid ring compressor unit comprises a liquid ring compressor 1, a steam-water separator 2 (the steam-water separator in the utility model is also called a three-phase separator and belongs to common equipment in the field of petrochemical industry), a heat exchanger 5 and a control module 7 (the control module can be PLC or DCS); a partition plate is arranged in the steam-water separator 2, the lower part of the steam-water separator 2 is divided into a water return cavity 201 and an oil discharge cavity 202, a water return cavity liquid level meter 4 is arranged on one side of the water return cavity 201, an oil discharge cavity liquid level transmitter 3 is arranged on one side of the oil discharge cavity 202, and an automatic switch valve 6 is arranged at the outlet of the oil discharge cavity; the oil discharge cavity liquid level transmitter 3 and the automatic switch valve 6 are in communication connection with the control module 7; an exhaust port of the liquid ring compressor 1 is communicated with a suction port of the steam-water separator 2, a water outlet of the water return cavity 201 is communicated with a water inlet of the heat exchanger 3, and a water outlet of the heat exchanger 3 is communicated with a water supply port of the liquid ring compressor 1.
An exhaust port of a steam-water separator (also called a first-stage steam-water separator) 2 in the first-stage liquid ring compressor unit is communicated with a suction port of a liquid ring compressor (also called a second-stage liquid ring compressor) in the second-stage liquid ring compressor unit, and an oil discharge cavity 202 of the first-stage steam-water separator is communicated with the suction port of the second-stage liquid ring compressor; a suction inlet of a liquid ring compressor (also called as a first-stage liquid ring compressor) 1 in the first-stage liquid ring compressor unit is communicated with an air inlet pipeline outside the system; an air outlet of a steam-water separator (also called a 2 nd stage steam-water separator) in the 2 nd stage liquid ring compressor unit is communicated with an air exhaust pipeline outside the system, and an oil discharge cavity of the steam-water separator is communicated with an oil storage container outside the system.
The structural features of one embodiment of the present invention are described above with reference to the drawings. Hereinafter, the method for recovering associated gas in an oil field will be described by taking this example as an example. The method comprises the following three basic steps:
step one, a first-stage liquid ring compressor sucks associated gas from an oil field, the associated gas carries water, crude oil is compressed in the first-stage liquid ring compressor and then discharged into a first-stage steam-water separator to carry out first separation of gas and liquid, the separated gas (still containing partial crude oil and water) is discharged into a suction inlet of a second-stage liquid ring compressor, most of the separated crude oil and water are deposited in a water return cavity of the first-stage steam-water separator, when a water return cavity is filled with liquid, crude oil floating on the water return cavity overflows into an oil discharge cavity of the first-stage steam-water separator, so that the separation of the crude oil and the water is realized, and the separated water is discharged from a water discharge port of the water return cavity and is cooled by a first-stage heat exchanger to be used as working water and then returned into the first-stage liquid ring compressor;
step two, when the oil level in the oil discharge cavity reaches a set oil level, the oil discharge cavity liquid level transmitter sends a signal to the control module, the control module sends an instruction to open the automatic switch valve and discharge the oil in the oil discharge cavity to the suction inlet of the second-stage ring compressor, and when the oil level in the oil discharge cavity is reduced to the set minimum oil level, the control module sends an instruction according to the signal sent by the oil cavity liquid level transmitter and closes the automatic switch valve;
step three, after the associated gas and the crude oil which are separated for the first time in the previous step enter a second-stage liquid ring compressor, the associated gas and the crude oil are discharged into a second-stage steam-water separator after being compressed for the second time by the second-stage liquid ring compressor, the second separation of the gas and the liquid is realized, the associated gas is compressed to the pressure required by the recovery process, the associated gas is discharged from an exhaust port of the second-stage steam-water separator and enters the next processing process, the crude oil floats on the liquid in a water return cavity, after the water return cavity is filled with the liquid, the crude oil overflows and falls into an oil discharge cavity of the second-stage steam-water separator, because the pressure in the steam-water separator is higher, when the oil level in an oil discharge cavity of the steam-water separator reaches the set oil level, a liquid level transmitter of the oil discharge cavity sends a signal to a control module, the control module sends an instruction, an automatic switch valve (oil discharge valve) is opened, and the crude oil in the oil discharge cavity is conveyed to an oil storage container outside the system, and closing the automatic switch valve when the oil level of the oil discharge cavity is reduced to the set minimum oil level.
It should be noted that, in the crude oil recovery scheme adopted in this embodiment, the crude oil in the oil discharge chamber of the first-stage steam-water separator is discharged into the second-stage liquid ring compressor and the second-stage steam-water separator, and is recovered after the second compression and the second separation, instead of directly recovering the crude oil in the oil discharge chamber into an oil storage container outside the system. The reason why this crude oil recovery scheme is adopted in this example is that: the discharge pressure of the first stage compression is low, and the crude oil is generally not delivered to a designated container with sufficient pressure, and if the crude oil is delivered, an additional oil pump is required, so that not only the input cost is increased, but also the control scheme is complicated, and the number of failure points is increased.
It should be noted that, in the process of actually implementing the utility model, more single-stage liquid ring compressor units can be connected in series according to the actual needs of the oil field. In addition, unlike the oil discharge cavity level transmitter and the automatic switch valve (oil discharge valve) whose working process is automatically controlled by the control module, the present embodiment does not use the control module to control the operation of the water return cavity level meter and the water return cavity drain. Of course, under the prior art, the control module automatically controls the operation of the water return cavity liquid level meter and the water return cavity water outlet, and the technical scheme is completely feasible.
It is particularly emphasized that the utility model can greatly improve the air extraction quantity of the liquid ring compressor unit by using the single liquid ring compressor in series. Taking a single liquid ring compressor with a compression ratio of 5 as an example, the extraction amount of the largest single liquid ring compressor (pump) actually produced by the applicant is about 120m at present3If two single-stage liquid ring compressors are connected in series to achieve a compression ratio of 5, the first-stage compression ratio of 2 can be selected, the second-stage compression ratio of 2.5 is selected, the total compression ratio of 2X2.5 is not changed to 5, but the air extraction amount of the liquid ring compressor with the compression ratio of 2 can reach 1400m3Min, the air quantity after compression becomes 1400/2-700 m3Min, as long as a liquid ring compressor with the compression ratio of 2.5 and the air extraction amount of 700m3/min is selected as the second-stage liquid ring compressor to be used in series, the total air extraction amount of the compressor set after the series connection can reach 1400m3Min, obviously greatly improved.
Claims (1)
1. A liquid ring multistage compressor system for recovering associated gas in an oil field comprises N groups of single-stage liquid ring compressor units which are connected in series from front to back, wherein N is more than or equal to 2; each group of single-stage liquid ring compressor units comprises a liquid ring compressor, a steam-water separator, a heat exchanger and a control module; a partition plate is arranged in the steam-water separator, the lower part of the steam-water separator is divided into a water return cavity and an oil discharge cavity, a water return cavity liquid level meter is arranged on one side of the water return cavity, an oil discharge cavity liquid level transmitter is arranged on one side of the oil discharge cavity, and an automatic switch valve is arranged at the outlet of the oil discharge cavity; the oil discharge cavity liquid level transmitter and the automatic switch valve are in communication connection with the control module; an exhaust port of the liquid ring compressor is communicated with a suction inlet of the steam-water separator, a water outlet of the water return cavity is communicated with a water inlet of the heat exchanger, and a water outlet of the heat exchanger is communicated with a water supply port of the liquid ring compressor; the exhaust port of the steam-water separator in the single-stage liquid ring compressor unit positioned at the front end is communicated with the suction inlet of the liquid ring compressor in the single-stage liquid ring compressor unit positioned at the adjacent rear end, and the oil discharge cavity of the steam-water separator positioned at the front end is communicated with the suction inlet of the liquid ring compressor positioned at the adjacent rear end; the suction inlet of a liquid ring compressor in the first-stage liquid ring compressor unit positioned at the foremost end is communicated with an air inlet pipeline outside the system; and an exhaust port of a steam-water separator in the N-stage liquid ring compressor unit positioned at the tail end is communicated with an exhaust pipeline outside the system, and an oil discharge cavity of the steam-water separator is communicated with an oil storage container outside the system.
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| CN202220620221.9U CN216952639U (en) | 2022-03-21 | 2022-03-21 | Oil field associated gas recovery liquid ring multistage compressor system |
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| CN202220620221.9U CN216952639U (en) | 2022-03-21 | 2022-03-21 | Oil field associated gas recovery liquid ring multistage compressor system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484279A (en) * | 2022-03-21 | 2022-05-13 | 广东肯富来泵业股份有限公司 | Oil field associated gas recovery liquid ring multi-stage compressor system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114484279A (en) * | 2022-03-21 | 2022-05-13 | 广东肯富来泵业股份有限公司 | Oil field associated gas recovery liquid ring multi-stage compressor system and method |
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