Multi-stage compressor capable of simultaneously outputting multiple pressures

Abstract

A multi-stage compressor capable of simultaneously outputting multiple pressures, comprising an air inlet end (1) and multiple air outlet ends; a main separation buffer (2) is provided between the air inlet end (1) and the air outlet ends, and the main separation buffer (2) divides a wellhead gas source into multiple paths, each path being provided with one or more sets of a cylinder and a separation buffer; a solenoid valve is provided on each pipeline to control the flow direction and pressure of gas such that the compressor simultaneously outputs different pressures, and two functions of boosting and gas lifting are integrated into one compressor.

Description

Multi-stage compressor capable of simultaneously outputting multiple pressures TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas production, and particularly relates to a multi-stage compressor capable of simultaneously outputting multiple pressures. BACKGROUND

[0002] A conventional compressor has only one gas inlet pipeline and one gas outlet pipeline. When boosting pressure or gas lifting is performed, although both boosting pressure and gas lifting need to be performed by increasing gas pressure, boosting pressure can be used for natural gas transportation and storage, and gas lifting is performed by injecting high-pressure gas into a well to increase wellbore liquid-carrying gas flow and lift wellbore liquid to the ground. Because the pressure levels required by boosting pressure and gas lifting are different, different compressors need to be used when boosting pressure and gas lifting are performed, and different equipment and processes need to be used for cooperation, which causes a complex pipeline system, high construction cost, and great maintenance difficulty.

[0003] Therefore, in view of the above problems, a multi-stage compressor capable of simultaneously outputting multiple pressures needs to be provided.

[0004] SUMMARY

[0005] (I) Technical problem to be solved

[0006] The technical problem to be solved by the present application is to solve the problem that a conventional compressor cannot simultaneously output two or more pressures.

[0007] (II) Technical scheme

[0008] In order to solve the above technical problem, the present application provides a multi-stage compressor capable of simultaneously outputting multiple pressures, which comprises one gas inlet end and multiple gas outlet ends, a main trunk separation buffer is arranged between the gas inlet end and the gas outlet ends, the main trunk separation buffer separates a wellhead gas source into multiple paths, each path is provided with one or more groups of cylinder and separation buffer combinations; the exhaust pipelines of each path are respectively connected to different gas outlet ends or two combinations are combined to one gas outlet end, and an electromagnetic valve is arranged on each pipeline to control the gas flow direction and pressure so that the compressor simultaneously outputs different pressures.

[0009] As a further description of the present application, preferably, the main trunk separation buffer separates the wellhead gas source into two paths, one path is provided with a first cylinder and a first separation buffer, the first cylinder and the first separation buffer are connected in series through a pipeline; the other path is provided with a second cylinder and a second separation buffer, the second cylinder and the second separation buffer are connected in series through a pipeline, the exhaust outlets of the first separation buffer and the second separation buffer are connected through a pipeline, and an electric valve actuator is arranged on the connected pipeline; the pipelines of the exhaust outlets of the first separation buffer and the second separation buffer are connected at the first gas outlet end, and a valve is arranged on the pipeline between the first separation buffer and the first gas outlet end.

[0010] As a further illustration of the present application, preferably, a third cylinder and a third separation buffer are connected in series to the pipeline connected to the gas outlet end of the secondary separation buffer, a valve is connected to the pipeline connected to the gas inlet of the third cylinder, and the gas outlet of the third separation buffer is connected to the second gas outlet end through a pipeline.

[0011] As a further illustration of the present application, preferably, the primary separation buffer is provided with two gas outlets, one of which is connected to the first gas outlet end through a pipeline, and the other of which is connected to the gas inlet of the second cylinder through a pipeline, and an electromagnetic valve is arranged on each of the two pipelines.

[0012] As a further illustration of the present application, preferably, the gas inlet of the third cylinder is connected to the gas outlet of the main separation buffer through a pipeline, and an electromagnetic valve is arranged on the pipeline.

[0013] As a further illustration of the present application, preferably, a valve is connected to the pipeline connected to the gas outlets of the primary separation buffer, the secondary separation buffer and the third separation buffer to communicate with the venting main pipe.

[0014] As a further illustration of the present application, preferably, a filter is arranged on the pipeline connected to the main separation buffer at the gas inlet end.

[0015] As a further illustration of the present application, preferably, an air cooler is arranged on the pipeline between the cylinder and the separation buffer.

[0016] As a further illustration of the present application, preferably, the non-gas discharge outlets of the main separation buffer and the branch separation buffers are connected to the pollution discharge main pipe through pipelines provided with electromagnetic valves, and the non-gas discharge outlet of the filter is also connected to the pollution discharge main pipe through a pipeline provided with an electromagnetic valve.

[0017] As a further illustration of the present application, preferably, instrument air is supplied to the electromagnetic valves.

[0018] (Three) beneficial effects

[0019] The above technical solutions of the present application have the following advantages:

[0020] By using multiple electromagnetic valves and high-precision electric valve actuators, the present application can change the series-parallel connection relationship between multiple separation buffers and cylinders, thereby realizing wide-range inlet pressure and displacement, wide-range outlet pressure and displacement, and enabling the compressor to output medium-pressure gas for external output into the pipe network after pressurization, and to output high-pressure gas for gas lifting, thereby realizing the function of a pressurization / gas lifting integrated machine. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the internal structure of the compressor of the present application.

[0022] Figure 2 is a three-stage parallel flow chart of the present application;

[0023] Figure 3 is a two-stage parallel flow chart of the present application, in series with a three-stage flow chart;

[0024] Figure 4 is a three-stage flow chart of the present application.

[0025] In the figure: 1, intake end; 11, first gas outlet; 12, second gas outlet; 13, sewage main pipe; 14, venting main pipe; 2, main separation buffer; 3, No. 1 cylinder; 4, first-stage separation buffer; 5, No. 2 cylinder; 6, second-stage separation buffer; 7, No. 3 cylinder; 8, third-stage separation buffer; 9, electric valve actuator. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0027] A multi-stage compressor capable of simultaneously outputting multiple pressures, as shown in Figure 1, has an intake end 1 and two gas outlets, a first gas outlet capable of outputting medium-pressure gas and a second gas outlet capable of outputting high-pressure gas. The intake end 1 is connected to a gas well at one end and is connected to an electromagnetic valve and a filter through a pipeline at the other end. The filter is provided to filter solid particles and part of the liquid. The filter outlet is connected to a main separation buffer 2 through a pipeline. The gas outlet of the main separation buffer 2 is connected to a No. 1 cylinder 3 and a No. 2 cylinder 5 through a pipeline in parallel. The No. 1 cylinder 3 is connected to an air cooler and a first-stage separation buffer 4 in series through a pipeline. The No. 2 cylinder 5 is connected to an air cooler and a second-stage separation buffer 6 in series through a pipeline. The gas outlet of the first-stage separation buffer 4 is also connected to the first gas outlet 11 through a pipeline with an electromagnetic valve. The gas outlet of the second-stage separation buffer 6 is connected to the pipeline connecting the first-stage separation buffer 4 and the first gas outlet 11 through a pipeline with a 100% repeatable electric valve actuator 9 with a precision of 2 parts per million and a common valve.

[0028] I. Three-stage parallel

[0029] In combination with Figure 1 and Figure 2, the gas outlet of the main separation buffer 2 is also connected to the gas inlet of a No. 3 cylinder 7 through a pipeline with an electromagnetic valve. The No. 3 cylinder 7 is connected to an air cooler and a third-stage separation buffer 8 in series through a pipeline. The gas outlet of the third-stage separation buffer 8 is connected to the second gas outlet 12 through a pipeline with a valve.

[0030] The first cylinder 3, the second cylinder 5 and the third cylinder 7 are in parallel state. The platform wellhead gas source enters the main stem separation buffer 2 through the gas inlet end 1, and then the fluid is divided into three paths, which enter the first cylinder 3, the second cylinder 5 and the third cylinder 7 respectively. The first cylinder 3 and the second cylinder 5 compress the gas and then enter the first gas outlet end 11 after passing through the first separation buffer 4 and the second separation buffer 6 respectively; the third cylinder 7 compresses the gas and then flows to the second gas outlet end 12 after passing through the third separation buffer 8. By connecting three cylinders in parallel and combining two pressurized air, the first gas outlet end 11 and the second gas outlet end 12 can realize the same pressure level output and different pressure level output, and the high pressure gas is used for gas lift and the medium pressure gas is used for pressure boosting output, so that the compressor can realize the two functions at the same time.

[0031] For example, as shown in the three parallel flow chart of FIG. 2 (the round dot is the separation point and the square dot is the combination point), the S platform X wellhead gas source has a gas inlet pressure of 1.0 MPa and a flow rate of 15×10 4 m 3 / d. After entering the main stem separation buffer 2 through the gas inlet end 1, the fluid is divided into three paths, which enter the first cylinder 3, the second cylinder 5 and the third cylinder 7 respectively. The first cylinder 3 has an inlet pressure of 0.98 MPa and a flow rate of 5×10 4 m 3 / d, and after pressurization, the exhaust pressure is 3 MPa and the flow rate is 5×10 4 m 3 / d. The second cylinder 5 has an inlet pressure of 0.98 MPa and a flow rate of 5×10 4 m 3 / d, and after pressurization, the exhaust pressure is 3 MPa and the flow rate is 5×10 4 m 3 / d. The two exhausts pass through the first separation buffer 4 and the second separation buffer 6 respectively, and then enter the first gas outlet end 11 for output.

[0032] The third cylinder 7 has an inlet pressure of 0.97 MPa and a flow rate of 5×10 4 m 3 / d, and after pressurization, the exhaust pressure is 3 MPa and the flow rate is 5×10 4 m 3 / d, and after passing through the third separation buffer 8, it enters the second gas outlet end 12 for output. Or after pressurization, the exhaust pressure is boosted to 4 MPa and the flow rate is 5×10 4 m 3 / d, and after passing through the third separation buffer 8, it enters the wellhead gas lift pipeline for gas lift through the second gas outlet end 12.

[0033] Two, two parallel connection, two and three series connection

[0034] In combination with Fig. 1 and Fig. 3, the outlet end of the secondary separation buffer 6 is also connected in series with the inlet of the third cylinder 7 through a pipe with an electromagnetic valve. When the electromagnetic valve on the pipe connecting the main separation buffer 2 and the third cylinder 7 is closed and the electromagnetic valve on the pipe is opened, the pressurized gas output by the second cylinder 5 flows partly to the first outlet end 11 through the regulation of the high-precision electric valve actuator 9 and the rest enters the third cylinder 7.

[0035] For example, as shown in Fig. 3 (the round dot is the separation point and the square dot is the merging point), the S platform X wellhead gas source comes with a pressure of 1.0 MPa and a flow rate of 12×10 4 m 3 / d. After entering the main separation buffer 2 through the inlet end 1, the gas is divided into two paths, which enter the first cylinder 3 and the second cylinder 5 respectively, and the electromagnetic valve on the pipe connecting the main separation buffer 2 and the third cylinder 7 is closed. The inlet pressure of the first cylinder 3 is 0.98 MPa and the flow rate is 6×10 4 m 3 / d, and the exhaust pressure after pressurization is 3 MPa and the flow rate is 6×10 4 m 3 / d. The inlet pressure of the second cylinder 5 is 0.98 MPa and the flow rate is 6×10 4 m 3 / d, and the exhaust pressure after pressurization is 3 MPa and the flow rate is 6×10 4 m 3 / d. After the exhaust gas of the two paths passes through the primary separation buffer 4 and the secondary separation buffer 6 respectively, the output pressure of the path entering the first outlet end 11 is 3 MPa and the flow rate increases to 10×10 4 m 3 / d after the regulation of the high-precision electric valve actuator 9, and the gas flows into the ground flow process for external transportation and dehydration. The output pressure of the other path is 3 MPa and the flow rate decreases to 2×10 4 m 3 / d, and then the gas flows into the third cylinder 7.

[0036] The exhaust pressure of the third cylinder 7 after pressurization is 7 MPa and the flow rate is 2×10 4 m 3 / d, and after passing through the tertiary separation buffer 8, the gas enters the second outlet end 12 and is lifted by the wellhead gas lifting pipe. In this way, not only is the gas lifting pressure further increased, but also the flow rate of the gas flowing into the external transportation can be adjusted, which enhances the external transportation amount while increasing the gas lifting pressure. Moreover, under the regulation of the high-precision electric valve actuator 9, the problem of damage to the cylinder shaft caused by the transient stress due to the excessively large or small single adjustment flow rate is solved, which is a win-win situation.

[0037] Three, tertiary series and switching of two kinds of output

[0038] In combination with Fig. 1 and Fig. 4, the outlet of the first separation buffer 4 is connected to the inlet of the second cylinder 5 through a pipeline with a solenoid valve, and the outlet of the third separation buffer 8 is also connected to the first outlet 11 through a pipeline with a valve. When the valve on the pipeline connecting the first separation buffer 4 and the first outlet 11 is closed and the valve on the pipeline is opened, the first cylinder 3 and the second cylinder 5 are in series at this time. When the valve on the pipeline connecting the second separation buffer 6 and the first outlet 11 is closed, the first cylinder 3, the second cylinder 5 and the third cylinder 7 are in series, and the exhaust pressure can reach the maximum. When the valve on the second outlet 12 is closed and the valve on the pipeline connecting the first outlet 11 is opened, the gas with the maximum pressure can be exported to improve the transportation capacity of natural gas. Or through the adjustment of the high-precision electric valve actuator 9, the medium-pressure and large-flow gas is exported through the first outlet 11, and the high-pressure and medium-flow gas is lifted through the second outlet 12.

[0039] For example, as shown in Fig. 4, the S platform X wellhead gas source comes in at 1.0 MPa and a flow rate of 10×10 4 m 3 / d. After entering the main trunk separation buffer 2 through the inlet 1, it enters the first cylinder 3. The solenoid valve on the pipeline connecting the main trunk separation buffer 2 with the second cylinder 5 and the third cylinder 7 is closed. After the first cylinder 3 is pressurized, the exhaust pressure is 1.8 MPa and the flow rate is 10×10 4 m 3 / d. The valve on the pipeline connecting the first separation buffer 4 and the first outlet 11 is closed, so that the gas flows to the second cylinder 5. After the gas flowing into the second cylinder 5 is pressurized, the exhaust pressure is 4.5 MPa and the flow rate is 10×10 4 m 3 / d. The valve on the pipeline connecting the second separation buffer 6 and the first outlet 11 is closed, so that the gas flows to the third cylinder 7. After the gas flowing into the third cylinder 7 is pressurized, the exhaust pressure is 10 MPa and the flow rate is 10×10 4 m 3 / d. The valve on the second outlet 12 is closed, and the valve on the pipeline connecting the third separation buffer 8 and the first outlet 11 is opened, so that the gas with the maximum pressure can be exported.

[0040] Alternatively, the valve on the pipeline connecting the third separation buffer 8 and the second outlet 12 is opened, the valve on the pipeline connecting the second separation buffer 6 and the first outlet 11 is opened, and the valve on the pipeline connecting the third separation buffer 8 and the first outlet 11 is closed. At this time, under the adjustment of the high-precision electric valve actuator 9, the gas flowing out of the second separation buffer 6 is divided into two paths. One path flows to the first outlet, and the exhaust pressure is 4.5 MPa and the flow rate is 7×10 4 m 3 / d. Another exhaust pressure is 4.5MPa, and the flow rate is 3×10 4 m 3 / d. The gas flows to the third cylinder 7, and the exhaust pressure increases to 10MPa after entering the third cylinder 7, and the flow rate is 3×10 4 m 3 / d, and flows to the second gas outlet 12 through the third separation buffer 8 for gas lifting operation.

[0041] As shown in Fig. 1, the non-gas exhaust outlets of the main separation buffer 2 and the branch separation buffers are all connected to the blowdown main pipe 13 through pipelines with electromagnetic valves, and the non-gas exhaust outlet of the filter is also connected to the blowdown main pipe 13 through a pipeline with an electromagnetic valve. The blowdown main pipe 13 is arranged to discharge non-gas impurities and improve the gas purity of natural gas. The pipelines connected to the gas outlets of the first separation buffer 4, the second separation buffer 6 and the third separation buffer 8 are all connected with valves to be connected to the vent main pipe 14. The vent main pipe 14 is arranged to automatically open the valve when the pressure of the container exceeds a set value to release the excessive pressure and prevent explosion accidents. Instrument air is connected to the electromagnetic valves as clean air to avoid non-gas impurities adhering to the valve core to cause the valve to close tightly and affect the regulation effect.

[0042] In summary, the application can change the series-parallel relationship between multiple separation buffers and cylinders by using multiple electromagnetic valves and high-precision electric valve actuators 9, and can realize wide-range inlet pressure and displacement, wide-range outlet pressure and displacement, and can output medium-pressure gas for pressurization and external output into the pipe network and output high-pressure gas for gas lifting to realize the function of a pressurization / gas lifting integrated machine under the premise of high safety. The adjustment process does not require manual shutdown, and can be completely controlled autonomously. In addition, the number of cylinders and separation buffers can be further increased, the series-parallel relationship can be changed, and the number of stages of the compressor can be increased to output more range of pressure gas, but generally the third stage of the application is preferred.

[0043] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions described in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A multi-stage compressor capable of simultaneously outputting multiple pressures, characterized by: It comprises an air inlet end (1) and multiple air outlet ends, and a main trunk separation buffer (2) is arranged between the air inlet end (1) and the air outlet ends, the main trunk separation buffer (2) separates the wellhead gas source into multiple paths, each path is provided with one or more groups of air cylinders and separation buffers in combination; the exhaust pipelines of each path are respectively connected with different air outlet ends or combined into one air outlet end, and each pipeline is provided with an electromagnetic valve to control the gas flow direction and pressure so that the compressor can output different pressures at the same time.

2. A multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 1, characterized in that: The main trunk separation buffer (2) separates the wellhead gas source into two paths, one path is provided with a first air cylinder (3) and a first separation buffer (4), the first air cylinder (3) and the first separation buffer (4) are connected in series through a pipeline; the other path is provided with a second air cylinder (5) and a second separation buffer (6), the second air cylinder (5) and the second separation buffer (6) are connected in series through a pipeline, the gas outlets of the first separation buffer (4) and the second separation buffer (6) are connected through a pipeline, and a motor valve actuator (9) is arranged on the pipeline; the pipelines of the gas outlets of the first separation buffer (4) and the second separation buffer (6) are connected at a first air outlet end (11), and a valve is arranged on the pipeline between the first separation buffer (4) and the first air outlet end (11).

3. A multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 2, characterized in that: The pipeline connected with the gas outlet of the second separation buffer (6) is connected with a third air cylinder (7) and a third separation buffer (8), the third air cylinder (7) and the third separation buffer (8) are connected in series, a valve is arranged on the pipeline connected with the gas inlet of the third air cylinder (7), and the gas outlet of the third separation buffer (8) is connected at a second air outlet end (12) through a pipeline.

4. The multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 3, characterized in that: The first separation buffer (4) is provided with two gas outlets, one of which is connected with the first air outlet end (11) through a pipeline, and the other of which is connected with the gas inlet of the second air cylinder (5) through a pipeline, and electromagnetic valves are arranged on the two pipelines.

5. A multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 4, characterized in that: The gas inlet of the third air cylinder (7) is connected with the gas outlet of the main trunk separation buffer (2) through a pipeline, and an electromagnetic valve is arranged on the pipeline.

6. The multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 1, characterized in that: Valves are arranged on the pipelines connected with the gas outlets of the first separation buffer (4), the second separation buffer (6) and the third separation buffer (8) to be connected at a venting main pipeline (14).

7. The multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 1, characterized in that: A filter is arranged on the pipeline connected with the main trunk separation buffer (2) and the air inlet end (1).

8. The multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 1, characterized in that: Air coolers are arranged on the pipelines between the air cylinders and the separation buffers.

9. A multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 8, characterized in that: The non-gas outlets of the main trunk separation buffer (2) and the separation buffers of the branch paths are connected to a blowdown main pipeline (13) through pipelines provided with electromagnetic valves, and the non-gas outlet of the filter is also connected to the blowdown main pipeline (13) through a pipeline provided with an electromagnetic valve.

10. The multi-stage compressor capable of simultaneously outputting multiple pressures according to claim 1, characterized in that: Instrument air is supplied to the electromagnetic valves.

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