Gas-liquid two-phase supercharging device

Abstract

According to the gas-liquid two-phase supercharging device, a hydraulic piston is arranged in a hydraulic cylinder, the hydraulic cylinder is provided with a liquid inlet / outlet, supercharging sealing pistons are arranged in supercharging working barrels, the two sides of the hydraulic cylinder are each provided with one supercharging working barrel, and the two supercharging sealing pistons and the hydraulic piston are connected with a connecting rod; the input pipeline is communicated with the pressurizing working barrel through a liquid inlet one-way valve, and the output pipeline is communicated with the pressurizing working barrel through a liquid outlet one-way valve. The hydraulic system drives the connecting rod to move left and right to drive the pressurizing piston to compress gas and liquid in the working barrel, and the gas and the liquid are output through the high-pressure port after reaching pressure. And (2) as the hydraulic system is adopted for driving, complicated mechanical driving is not needed, extremely low frequency of compression stroke frequency can be realized, and the liquid impact phenomenon is avoided. And 3) one hydraulic piston simultaneously drives the two pressurizing pistons, so that bidirectional acting is realized, and the pressurizing efficiency is doubled. (4) gas and liquid produced by a natural gas well can be pressurized and conveyed simultaneously in two phases, and (5) due to the adoption of hydraulic driving, a set of hydraulic system is easy to drive a plurality of compression units to work successively or simultaneously, and can be started according to production requirements, so that the purposes of energy conservation and efficiency improvement are achieved.

Description

Technical Field

[0001] This invention belongs to the field of gas-liquid mixed transportation and pressurization technology, and specifically relates to a gas-liquid two-phase pressurization device, which is a portable equipment for centralized external transportation of gas well products and can be used in most natural gas well sites. Background Technology

[0002] In the mid-to-late stages of natural gas well development, as gas production operations continue, the wellhead pressure decreases. The back pressure of the produced natural gas and liquid (usually water) increases, and the wellhead pressure remains relatively low with slight fluctuations for an extended period. This low wellhead pressure prevents the natural gas from entering the pipeline network. The wellhead natural gas is often pressurized by a compressor before being discharged into the pipeline. Typically, a two-phase separator separates the gas and liquid phases, which are then transported separately via pipelines to the gathering station. The liquid phase usually enters a storage tank and is then pumped to a processing station. If the external transmission pressure is high, a traditional reciprocating compressor is used to pressurize the gas before it is transported to the gathering station for centralized processing. Simultaneous pressurization of both gas and liquid phases aims to increase natural gas well production and facilitate external transmission.

[0003] As extraction continues, formation energy gradually decreases, reducing the gas well's own liquid-carrying capacity and leading to water flooding in some wells. To extend the well's lifespan, methods such as foam drainage and reducing wellhead back pressure are commonly used. Reducing wellhead back pressure typically involves using a compressor to pressurize the wellhead or gas pipeline, requiring gas-liquid separation before entering the compressor. This process is relatively complex, requiring timely handling of the removed liquid, resulting in high electricity and maintenance costs, and significant manual intervention. Furthermore, this process is complex, requires a large area, and necessitates numerous supporting facilities; the compressor cannot accept water, and separated water must be repeatedly transported, leading to high energy consumption, significant manual intervention, large initial investment, and high operating costs; it also has certain requirements for inlet pressure, and cannot meet the demands of high-efficiency operation throughout the entire lifecycle when gas well oil pressure fluctuates significantly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a gas-liquid two-phase booster device with a simple process, low operating cost, and high safety and efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a gas-liquid two-phase pressurization device, characterized in that: it includes an input pipe, an output pipe, a first pressurization working cylinder and a second pressurization working cylinder, a connecting rod, a first pressurization sealing piston, a second pressurization sealing piston, a hydraulic cylinder, a hydraulic piston, a first inlet / outlet, a second inlet / outlet, a first outlet check valve, a second outlet check valve, a third outlet check valve, a fourth outlet check valve, a first inlet check valve, a second inlet check valve, a third inlet check valve, and a fourth inlet check valve; The hydraulic piston is disposed within the hydraulic cylinder, with the first inlet / outlet and the second inlet / outlet respectively located at the left and right ends of the hydraulic cylinder; the first pressure-boosting sealing piston is disposed within the first pressure-boosting working cylinder, and the second pressure-boosting sealing piston is disposed within the second pressure-boosting working cylinder; the hydraulic cylinder is disposed between the first pressure-boosting working cylinder and the second pressure-boosting working cylinder, and the first pressure-boosting working cylinder, the hydraulic cylinder, and the second pressure-boosting working cylinder are connected sequentially from left to right; the first pressure-boosting sealing piston, the hydraulic piston, and the second pressure-boosting sealing piston are connected sequentially from left to right to the connecting rod. The input pipe is connected to the left side of the first pressurizing working cylinder through a first inlet check valve, and the input pipe is connected to the right side of the first pressurizing working cylinder through a second inlet check valve; the output pipe is connected to the left side of the first pressurizing working cylinder through a first outlet check valve, and the output pipe is connected to the right side of the first pressurizing working cylinder through a second outlet check valve. The input pipe is connected to the left side of the second pressurizing working cylinder through a third inlet check valve, and the input pipe is connected to the right side of the second pressurizing working cylinder through a fourth inlet check valve; the output pipe is connected to the left side of the second pressurizing working cylinder through a third outlet check valve, and the output pipe is connected to the right side of the second pressurizing working cylinder through a fourth outlet check valve.

[0006] Preferably, the first pressurizing working cylinder, the hydraulic cylinder, and the second pressurizing working cylinder are rigidly fixedly connected in sequence from left to right.

[0007] Preferably, the connecting rod passes through the middle of the hydraulic piston, and its left and right ends are rigidly fixedly connected to the first pressure-boosting sealing piston and the second pressure-boosting sealing piston, respectively.

[0008] Preferably, the first inlet / outlet and the second inlet / outlet are respectively located on the upper part of the left and right ends of the hydraulic cylinder.

[0009] Preferably, the input pipe is connected to the lower left part of the first pressurizing working cylinder through a first liquid inlet check valve, and the input pipe is connected to the lower right part of the first pressurizing working cylinder through a second liquid inlet check valve.

[0010] Preferably, the output pipe is connected to the upper left part of the first pressurizing working cylinder through a first liquid outlet check valve, and the output pipe is connected to the upper right part of the first pressurizing working cylinder through a second liquid outlet check valve.

[0011] Preferably, the input pipe is connected to the lower left part of the second pressurizing working cylinder through a third liquid inlet check valve, and the input pipe is connected to the lower right part of the second pressurizing working cylinder through a fourth liquid inlet check valve.

[0012] Preferably, the output pipe is connected to the upper left part of the second pressurizing working cylinder through a third liquid outlet check valve, and the output pipe is connected to the upper right part of the second pressurizing working cylinder through a fourth liquid outlet check valve.

[0013] Preferably, the connecting rod is rigidly fixed to the middle of the hydraulic piston.

[0014] Compared with existing technologies, the beneficial effects of this invention are: 1) The hydraulic system drives the connecting rod to move left and right, driving the booster piston to compress the gas and liquid in the working cylinder, and outputting them through the high-pressure port after reaching the required pressure. 2) Due to the use of a hydraulic system, complex mechanical drives are not required, enabling extremely low compression stroke frequencies and avoiding "liquid slugging." 3) One hydraulic piston simultaneously drives two booster pistons, achieving bidirectional work and doubling the boosting efficiency. 4) It can simultaneously boost and transport both gas and liquid produced from natural gas wells. 5) Due to the use of hydraulic drive, it is easy to realize the use of one hydraulic system to drive multiple compression units to work sequentially or simultaneously, and can be started according to production needs, achieving energy saving and efficiency improvement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0016] The diagram is marked as follows: 1. First pressurizing working cylinder; 2. First pressurizing sealing piston; 3. Connecting rod; 4. First inlet / outlet; 5. Hydraulic piston; 6. Second inlet / outlet; 7. Second pressurizing sealing piston; 8. Second pressurizing working cylinder; 9. First outlet check valve; 10. Second outlet check valve; 11. Third outlet check valve; 12. Fourth outlet check valve; 13. First inlet check valve; 14. Second inlet check valve; 15. Third inlet check valve; 16. Fourth inlet check valve; 55. Hydraulic cylinder; 88. Input pipe; 99. Output pipe. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0018] like Figure 1As shown, a gas-liquid two-phase pressurization device includes an input pipe 88, an output pipe 99, a first pressurization working cylinder 1 and a second pressurization working cylinder 8, a connecting rod 3, a first pressurization sealing piston 2, a second pressurization sealing piston 7, a hydraulic cylinder 55, a hydraulic piston 5, a first inlet / outlet port 4, a second inlet / outlet port 6, a first outlet check valve 9, a second outlet check valve 10, a third outlet check valve 11, a fourth outlet check valve 12, a first inlet check valve 13, a second inlet check valve 14, a third inlet check valve 15, and a fourth inlet check valve 16. The hydraulic piston 5 is disposed inside the hydraulic cylinder 55. The first inlet / outlet port 4 and the second inlet / outlet port 6 are respectively disposed at the upper part of the left and right ends of the hydraulic cylinder 55. The first pressure-boosting sealing piston 2 is disposed inside the first pressure-boosting working cylinder 1, and the second pressure-boosting sealing piston 7 is disposed inside the second pressure-boosting working cylinder 8. The hydraulic cylinder 55 is disposed between the first pressure-boosting working cylinder 1 and the second pressure-boosting working cylinder 8. The first pressure-boosting sealing piston 2, the hydraulic piston 5, and the second pressure-boosting sealing piston 7 are rigidly fixedly connected to the connecting rod 3 in sequence from left to right. The connecting rod 3 is rigidly fixedly connected to the middle part of the hydraulic piston 5, and the left and right ends of the connecting rod 3 are rigidly fixedly connected to the first pressure-boosting sealing piston 2 and the second pressure-boosting sealing piston 7, respectively.

[0019] The input pipe 88 is connected to the lower left of the first pressurizing working cylinder 1 through the first inlet check valve 13, and the input pipe 88 is connected to the lower right of the first pressurizing working cylinder 1 through the second inlet check valve 14; the output pipe 99 is connected to the upper left of the first pressurizing working cylinder 1 through the first outlet check valve 9, and the output pipe 99 is connected to the upper right of the first pressurizing working cylinder 1 through the second outlet check valve 10. The input pipe 88 is connected to the lower left of the second pressurizing working cylinder 2 through the third inlet check valve 15, and the input pipe 88 is connected to the lower right of the second pressurizing working cylinder 2 through the fourth inlet check valve 16; the output pipe 99 is connected to the upper left of the second pressurizing working cylinder 2 through the third outlet check valve 11, and the output pipe 99 is connected to the upper right of the second pressurizing working cylinder 2 through the fourth outlet check valve 12.

[0020] The working principle of this invention is as follows: like Figure 1As shown, when the equipment starts, hydraulic oil enters the hydraulic cylinder 55 from the first inlet / outlet port 4, driving the hydraulic piston 5 to move to the right. The hydraulic piston 5 drives the connecting rod 3 to move to the right, simultaneously driving the first pressurizing sealing piston 2 and the second pressurizing sealing piston 7 to move to the right. The first pressurizing sealing piston 2 pressurizes the oil-gas mixture input into the first pressurizing working cylinder 1 through the second inlet check valve 14, and then the oil-gas mixture is discharged from the second outlet check valve 10 to the outlet pipe 99. At the same time, the second pressurizing sealing piston 7 pressurizes the oil-gas mixture input into the second pressurizing working cylinder 8 through the fourth inlet check valve 16, and then the oil-gas mixture is discharged from the fourth outlet check valve 12 to the outlet pipe 99. The hydraulic oil returns from the second inlet / outlet port 6.

[0021] During the return stroke, the hydraulic system reverses direction, and hydraulic oil enters the hydraulic cylinder 55 from the second inlet / outlet port 6, driving the hydraulic piston 5 to move to the left. The hydraulic piston 5 drives the connecting rod 3 to move to the left, and simultaneously drives the first pressure-boosting sealing piston 2 and the second pressure-boosting sealing piston 7 to move to the left. The first pressurizing sealing piston 2 pressurizes the oil-gas mixture input into the first pressurizing working cylinder 1 via the first inlet check valve 13, and then the oil-gas mixture is discharged from the first outlet check valve 9 to the outlet pipe 99. At the same time, the second pressurizing sealing piston 7 pressurizes the oil-gas mixture input into the second pressurizing working cylinder 8 via the third inlet check valve 15, and then the oil-gas mixture is discharged from the third outlet check valve 11 to the outlet pipe 99. The hydraulic oil returns from the first inlet / outlet port 4.

[0022] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A gas-liquid two-phase pressurization device, characterized in that: It includes an input pipe, an output pipe, a first pressurizing working cylinder and a second pressurizing working cylinder, a connecting rod, a first pressurizing sealing piston, a second pressurizing sealing piston, a hydraulic cylinder, a hydraulic piston, a first inlet / outlet port, a second inlet / outlet port, a first outlet check valve, a second outlet check valve, a third outlet check valve, a fourth outlet check valve, a first inlet check valve, a second inlet check valve, a third inlet check valve, and a fourth inlet check valve; The hydraulic piston is disposed within the hydraulic cylinder, with the first inlet / outlet and the second inlet / outlet respectively located at the left and right ends of the hydraulic cylinder; the first pressure-boosting sealing piston is disposed within the first pressure-boosting working cylinder, and the second pressure-boosting sealing piston is disposed within the second pressure-boosting working cylinder; the hydraulic cylinder is disposed between the first pressure-boosting working cylinder and the second pressure-boosting working cylinder, and the first pressure-boosting working cylinder, the hydraulic cylinder, and the second pressure-boosting working cylinder are connected sequentially from left to right; the first pressure-boosting sealing piston, the hydraulic piston, and the second pressure-boosting sealing piston are connected sequentially from left to right to the connecting rod. The input pipe is connected to the left side of the first pressurizing working cylinder through a first liquid inlet check valve, and the input pipe is connected to the right side of the first pressurizing working cylinder through a second liquid inlet check valve. The output pipe is connected to the left side of the first pressurizing working cylinder through a first liquid outlet check valve, and the output pipe is connected to the right side of the first pressurizing working cylinder through a second liquid outlet check valve. The input pipe is connected to the left side of the second pressurizing working cylinder through the third liquid inlet check valve, and the input pipe is connected to the right side of the second pressurizing working cylinder through the fourth liquid inlet check valve; The output pipe is connected to the left side of the second pressurizing working cylinder through a third liquid outlet check valve, and the output pipe is connected to the right side of the second pressurizing working cylinder through a fourth liquid outlet check valve.

2. The gas-liquid two-phase booster device according to claim 1, characterized in that: The first pressurizing working cylinder, the hydraulic cylinder, and the second pressurizing working cylinder are rigidly fixedly connected in sequence from left to right.

3. The gas-liquid two-phase pressurization device according to claim 2, characterized in that: The connecting rod passes through the middle of the hydraulic piston, and its left and right ends are rigidly fixedly connected to the first pressure-boosting sealing piston and the second pressure-boosting sealing piston, respectively.

4. The gas-liquid two-phase booster device according to claim 3, characterized in that: The first inlet / outlet and the second inlet / outlet are respectively located on the upper part of the left and right ends of the hydraulic cylinder.

5. The gas-liquid two-phase pressurization device according to claim 4, characterized in that: The input pipe is connected to the lower left part of the first pressurizing working cylinder through the first liquid inlet check valve, and the input pipe is connected to the lower right part of the first pressurizing working cylinder through the second liquid inlet check valve.

6. The gas-liquid two-phase booster device according to claim 5, characterized in that: The output pipe is connected to the upper left part of the first pressurizing working cylinder through the first liquid outlet check valve, and the output pipe is connected to the upper right part of the first pressurizing working cylinder through the second liquid outlet check valve.

7. The gas-liquid two-phase booster device according to claim 6, characterized in that: The input pipe is connected to the lower left part of the second pressurizing working cylinder through the third liquid inlet check valve, and the input pipe is connected to the lower right part of the second pressurizing working cylinder through the fourth liquid inlet check valve.

8. The gas-liquid two-phase booster device according to claim 7, characterized in that: The output pipe is connected to the upper left part of the second pressurizing working cylinder through the third liquid outlet check valve, and the output pipe is connected to the upper right part of the second pressurizing working cylinder through the fourth liquid outlet check valve.

9. The gas-liquid two-phase booster device according to claim 8, characterized in that: The connecting rod is rigidly fixed to the middle of the hydraulic piston.

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