Wellhead depressurization gas production device

Abstract

The invention discloses a wellhead depressurization gas production device which comprises a pipe body, a power gas connecting pipe is arranged on the lower side of the pipe body, the outlet end of the power gas connecting pipe is connected with a power pneumatic control valve, the flow direction of gas in the power gas connecting pipe is the same as the flow direction of liquid in the pipe body, and a two-way valve is arranged on the upper portion of the pipe body. And a pressure gauge is arranged on the two-way valve. The wellhead depressurization gas production device is small in size, simple in structure, convenient to machine and low in cost; the whole device is free of moving parts, stable, reliable, convenient to maintain, low in maintenance cost and small in maintenance workload.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well equipment, and in particular relates to a wellhead pressure reduction gas production device. Background Art

[0002] At present, there are a large number of low-pressure gas wells in my country. The collection efficiency is low due to the low pressure. In order to collect gas smoothly, pressurization is urgently needed. The natural gas at the wellhead of low-pressure gas wells mostly uses air compressors and other equipment to perform ground pressurization. However, the air compressor will consume a lot of electricity during the pressurization process, which is very costly. Summary of the invention

[0003] The purpose of the present invention is to provide a wellhead pressure reduction gas production device to solve the problem that using an air compressor to pressurize the natural gas at the wellhead of a low-pressure gas well on the ground to enter the pipeline network consumes a lot of electricity, resulting in high costs.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a wellhead pressure reduction gas production device, including a pipe body, a power gas connecting pipe is arranged on the lower side of the pipe body, the outlet end of the power gas connecting pipe is connected to a power gas control valve, and the gas flow direction in the power gas connecting pipe is the same as the flow direction of the liquid in the pipe body, a binary valve is arranged on the upper side of the pipe body, and a pressure gauge is arranged on the binary valve.

[0005] As a preferred technical solution of the present invention, a conical mixing tube is arranged in the tube body, and the small port of the conical mixing tube is directly opposite to the outlet end of the power gas pipe.

[0006] As a preferred technical solution of the present invention, the power gas connecting pipe includes a vertical pipe and a horizontal pipe connected to the upper end of the vertical pipe, and the power gas control valve is arranged at the outlet end of the horizontal pipe.

[0007] As a preferred technical solution of the present invention, a sand settling cylinder is provided at the lower side of the tube body, and a sand discharge plug is provided at the bottom of the sand settling cylinder.

[0008] As a preferred technical solution of the present invention, connecting flanges are provided at both ends of the pipe body.

[0009] The beneficial effects of the present invention are as follows: the wellhead pressure reduction gas production device of the present invention is small in size, simple in structure, easy to process and low in cost; there are no moving parts in the entire device, which is stable, reliable, easy to maintain, with low maintenance cost and small maintenance workload. After the natural gas is pressurized by the device, the speed and temperature of the mixed natural gas are relatively uniform, which is conducive to the stability of the pressure of the transmission pipeline network. Therefore, the use of the jet drainage device is more economical, simple and reliable than other mechanical supercharging equipment (such as compressors, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a wellhead pressure reduction gas production device of the present invention.

[0011] In the figure, 1. connecting flange, 2. power gas control valve, 3. conical mixing pipe, 4. two-way valve, 5. pressure gauge, 6. sand settling cylinder, 7. sand discharge plug, 8. power gas connecting pipe, 9. pipe body. DETAILED DESCRIPTION

[0012] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] Example 1

[0014] like Figure 1 As shown, a wellhead pressure reduction gas production device of the present invention comprises a pipe body 9, a power gas pipe 8 is arranged on the lower side of the pipe body 9, a power gas control valve 2 is connected to the outlet end of the power gas pipe 8, and the gas flow direction in the power gas pipe 8 is the same as the flow direction of the liquid in the pipe body 9, a binary valve 4 is arranged on the upper side of the pipe body 9, and a pressure gauge 5 is arranged on the binary valve 4. The pipe body 9 is connected to the existing single wellhead process flow line, the power gas pipe 8 is connected to the wellhead centralized gas lift process, and provides power gas for the equipment, the internal power gas control valve 2 mainly adjusts the flow of the power gas, and the pressure gauge 5 is installed to record the pressure at the end of the device.

[0015] By using jet technology, the gas energy of high-pressure gas wells can be used to drive the production of low-pressure wells, so that the pressure of low-pressure gas increases after being sucked into and mixed by high-pressure gas, thereby achieving normal external transmission of low-pressure gas wells. The basic feature of the natural gas jet device used is that it can effectively increase the pressure of the fluid without consuming mechanical energy.

[0016] The jet device is small in size, simple in structure, easy to process and low in cost. There are no moving parts in the whole device, which is stable and reliable. It is easy to maintain, with low maintenance cost and small maintenance workload. At the same time, the jet device is not only simple in structure, but also can be easily connected with other equipment on the ground manifold through a universal variable buckle joint. In addition, after the natural gas is pressurized by the jet device, the speed and temperature of the natural gas after mixing are relatively uniform, which is conducive to the stability of the pressure of the transmission pipeline network. Therefore, the use of the jet drainage device is more economical, simple and reliable than other mechanical supercharging equipment (compressors, etc.).

[0017] At present, the most prominent application of jet process technology is the jet pump, which is a fluid machinery and mixing reaction equipment that uses the jet turbulence diffusion effect to transfer energy and mass. Since the mixing of two fluids with different pressures in the jet pump will produce a large energy loss, its energy and mass transfer efficiency is low, so improving the energy and mass transfer efficiency of the jet pump has always been a focus of attention. There are two main ways to improve the efficiency of the jet pump: ① Develop a new type of jet pump structure, such as using multiple jets, multi-stage jets, etc.; ② Use pulse jets on the same jet pump device.

[0018] The jet pump consists of four parts: the jet tube, the throat, the diffuser, and the suction tube. Its working principle is to eject the working fluid through the nozzle at high speed, and at the same time, the static pressure energy is partially converted into kinetic energy, a vacuum is formed in the tube, and the low-pressure fluid is sucked into the pump. The two fluids are mixed and energy is exchanged in the throat, the speed of the working fluid decreases, the speed of the sucked fluid increases, the pressure gradually increases, and the speeds tend to be consistent at the throat outlet. When the mixed fluid passes through the diffuser, as the flow channel increases, the speed gradually decreases, the kinetic energy is converted into pressure energy, and the pressure of the mixed fluid increases accordingly. The size of the jet pump components has a great influence on the suction speed.

[0019] The wellhead pressure reduction gas production device of the present invention is similar to a jet pump. It drives the low-pressure airflow at the wellhead through the concentrated gas lift high-pressure airflow, and then enters the station after mixing, thereby achieving the effect of reducing the wellhead oil pressure and ensuring the stability of the inlet pressure.

[0020] Working principle of the wellhead pressure reduction gas production device: the working fluid is ejected at high speed through the power gas control valve 2 at the outlet end of the pipe body 8, and momentum exchange occurs with the surrounding sucked fluid in the power gas control valve 2 due to the turbulent diffusion of the jet boundary layer. From the inlet end section of the pipe body 8 to the power gas control valve 2, the static pressure energy is partially converted into kinetic energy, the kinetic energy increases, a vacuum is formed in the pipe body 1, and the low-pressure fluid is sucked into the end of the pipe body 1. The two fluids are mixed and energy is transferred at the end of the power gas control valve 2 of the pipe body 8, the speed of the working fluid decreases, and the speed of the sucked fluid increases. During the energy transfer process, the speeds of the two gradually become consistent. The pressure of the fluid is reduced from the nozzle outlet to the outlet end section of the pipe body 8, and then gradually increases. The kinetic energy of the mixed fluid is converted into pressure energy through the mixing tube 3, and the pressure is further increased. The gas is discharged along the discharge port to complete the gas transportation.

[0021] Example 2

[0022] like Figure 1 As shown, different from Example 1, in Example 2, a wellhead pressure reduction gas production device of the present invention has a conical mixing tube 3 arranged in its pipe body 9, and the small port of the conical mixing tube 3 is directly opposite to the outlet end of the power gas connecting pipe 8. The purpose of the mixing tube is to evenly mix the power gas and the mixed wet gas produced by the single well oil pipe.

[0023] Example 3

[0024] like Figure 1 As shown, different from Example 2, in Example 3, a wellhead pressure reduction gas production device of the present invention, the power gas connecting pipe 8 includes a vertical pipe and a horizontal pipe connected to the upper end of the vertical pipe, and the power gas control valve 2 is arranged at the outlet end of the horizontal pipe, so that the directional transportation of the power gas can be completed in a limited space.

[0025] Example 4

[0026] like Figure 1 As shown, different from Example 3, in Example 4, a wellhead pressure reduction gas production device of the present invention has a sand settling tube 6 disposed on the lower side of a pipe body 9, and a sand discharge wire plug 7 is disposed at the bottom of the sand settling tube 6.

[0027] The sand settling cylinder is located at the lower end of the power gas control valve 2 and the mixing tube 3, and is used to deposit the accumulated sand produced in a single well. The collected accumulated sand can be discharged by regularly opening the sand discharge plug 7.

[0028] Example 5

[0029] like Figure 1 As shown, different from Example 4, in Example 5, a wellhead pressure reduction gas production device of the present invention has connecting flanges 1 at both ends of its pipe body 9.

[0030] The two ends of the pipe body 9 can be assembled in the single wellhead process flow line through two connecting flanges 1, and the assembly and disassembly is relatively convenient.

Claims

1. A wellhead pressure reduction gas production device, characterized in that: The invention comprises a pipe body (9), a power gas pipe (8) is arranged on the lower side of the pipe body (9), the outlet end of the power gas pipe (8) is connected to a power gas control valve (2), and the flow direction of gas in the power gas pipe (8) is the same as the flow direction of liquid in the pipe body (9), a binary valve (4) is arranged on the upper side of the pipe body (9), and a pressure gauge (5) is arranged on the binary valve (4).

2. The wellhead pressure reduction gas production device according to claim 1, characterized in that: A conical mixing tube (3) is arranged in the tube body (9), and a small end of the conical mixing tube (3) is directly opposite to the outlet end of the power gas pipe (8).

3. The wellhead pressure reduction gas production device according to claim 2, characterized in that: The power gas pipe (8) comprises a vertical pipe and a transverse pipe connected to the upper end of the vertical pipe, and the power gas control valve (2) is arranged at the outlet end of the transverse pipe.

4. The wellhead pressure reduction gas production device according to claim 3, characterized in that: A sand settling cylinder (6) is arranged at the lower side of the tube body (9), and a sand discharge plug (7) is arranged at the bottom of the sand settling cylinder (6).

5. The wellhead pressure reduction gas production device according to claim 4, characterized in that: Both ends of the tube body (9) are provided with connecting flanges (1).

Images