Inlet gas-liquid ratio control conveying device of oil-gas multiphase pump

Abstract

The utility model belongs to the technical field of oil field fluid conveying, and discloses an oil-gas multiphase pump inlet gas-liquid ratio control conveying device which comprises a base, an outer sleeve is fixedly installed on the base, a blow-off pipe is communicated with the side wall, close to the bottom, of the outer sleeve, and an oil-gas inlet pipe is communicated with the position, located above the blow-off pipe, of the side wall of the outer sleeve. An inner sleeve set is arranged in the outer sleeve, one end, close to the bottom, of the inner sleeve set is communicated with a flow mixing pipe, the flow mixing pipe simultaneously penetrates through the inner wall of the outer sleeve, a gas inlet pipe assembly is communicated with the position, above the oil gas inlet pipe, of the outer wall of the outer sleeve, and a liquid level controller is arranged at the position, opposite to the gas inlet pipe assembly, of the outer wall of the outer sleeve. The multi-phase flow mixing proportion adjusting device is simple in overall structure, can automatically adjust the multi-phase flow mixing proportion, and meets the requirement of mixed conveying equipment for conveying multi-phase flow media, so that stable operation of the equipment is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield fluid transportation, and in particular relates to an oil-gas mixed transportation pump inlet gas-liquid ratio control and transportation device. Background Art

[0002] With the continuous growth of global energy demand, the development and utilization of oil and gas resources have become the focus of attention of all countries. In the process of oil and gas field development, oil and gas mixed transportation technology has gradually become one of the important technologies in the petroleum industry because of its advantages such as improving the comprehensive utilization rate of oil and gas resources, reducing production costs and reducing environmental pollution. However, there are many technical difficulties in the process of oil and gas mixed transportation, especially the large and unstable oil-gas ratio, large temperature difference and viscosity changes of the conveying medium, and the oil and gas medium containing many impurities and easy to clog. These problems make the research and development and application of oil and gas mixed transportation pumps face many challenges.

[0003] In oil fields, there is a common phenomenon of oil and natural gas coexistence. As a new transportation technology, multiphase mixed pump technology has attracted extensive attention from the pump industry and oil fields at home and abroad due to its good economic performance. The existing oil and gas mixed pumps are mainly positive displacement pumps, plunger pumps, screw pumps (single screw pumps, twin screw pumps), cam rubber rotor pumps, eccentric rotor pumps, etc.

[0004] Existing oil-gas mixed flow pumps have certain requirements for the oil-gas ratio and cannot meet the requirements of single gas phase flow transportation. When the gas phase flow is blocked, the gas phase flow causes the mixed flow pump inlet working conditions to change, the mixed pump shaft load changes greatly, the outlet pressure drops sharply, the operation is unstable, and flow interruption and mechanical failure occur.

[0005] The current technical measures mainly include three aspects: first, the pump inlet manifold forces oil and gas mixing, but when there is no liquid supply, there is only single-phase airflow; second, the pump cavity liquid storage is increased, and the liquid storage capacity cannot meet the continuous operation requirements; third, the pump outlet is diverted back to the inlet, which not only reduces the transportation capacity, but also wastes energy consumption. Therefore, these measures are difficult to meet the ever-changing multiphase flow transportation requirements. Utility Model Content

[0006] The main technical problem to be solved by the utility model is to provide an oil and gas mixed pump inlet gas-liquid ratio control and conveying device with a simple overall structure, which can automatically adjust the multiphase flow mixing ratio to meet the requirements of the mixed conveying equipment for conveying multiphase flow media, thereby ensuring stable operation of the equipment and improving production efficiency.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A gas-liquid ratio control and delivery device for an oil-gas mixed delivery pump inlet comprises a base, an outer sleeve is fixedly mounted on the base, the outer sleeve is connected to a sewage pipe on the side wall near the bottom, an oil-gas inlet pipe is connected to the side wall of the outer sleeve above the sewage pipe, an inner sleeve group is arranged inside the outer sleeve, one end of the inner sleeve group near the bottom is connected to a mixing pipe, the mixing pipe runs through the inner wall of the outer sleeve at the same time, an air intake pipe assembly is connected to the outer wall of the outer sleeve above the oil-gas inlet pipe, and a liquid level controller is arranged on the outer wall of the outer sleeve at a position opposite to the air intake pipe assembly.

[0009] The following is a further optimization of the above technical solution by the utility model:

[0010] The outer sleeve comprises a tube body fixedly mounted on a base, and a tube cover is sealedly mounted on the top of the tube body.

[0011] Further optimization: a sewage outlet is provided on the pipe body at a position corresponding to the sewage discharge pipe, and the sewage discharge pipe is connected to the sewage outlet; an oil and gas inlet is provided on the pipe body at a position corresponding to the oil and gas inlet pipe, and the oil and gas inlet pipe is connected to the oil and gas inlet.

[0012] Further optimization: the sleeve group includes an inner sleeve arranged inside the tube body, the inner sleeve is set as a closed end near the bottom end of the tube body, an output port is opened at a position of the inner sleeve corresponding to the mixing tube, and the inner sleeve is connected to the output port; a straight through hole group is set on the outer wall of the inner sleeve.

[0013] Further optimization: the straight through hole group includes a plurality of first through holes arranged in a circular array on the outer wall of the inner sleeve near the closed end, a plurality of second through holes arranged in a circular array on the outer wall of the inner sleeve above the first through holes, and a plurality of third through holes arranged in a circular array on the outer wall of the inner sleeve above the second through holes; the aperture of the first through hole is smaller than that of the second through hole, and the aperture of the third through hole is larger than that of the second through hole.

[0014] Further optimization: an air intake pipe assembly is connected to the outer wall of the outer sleeve near the upper end.

[0015] Further optimization: the air intake pipe assembly includes an air pipe connected to the pipe body, a one-way valve is connected to the air pipe near the pipe body, and a pressure regulating valve is connected to the air pipe near the one-way valve.

[0016] The utility model adopts the above technical scheme, which is ingenious in conception and reasonable in structure. It can effectively solve the problem of interrupted flow in the oil and gas transportation process and meet the requirements of the oil and gas mixed transportation pump for the imported transportation medium. At the same time, according to the feedback signal of the liquid level controller to the control system, it can automatically control the motor operation speed of the oil and gas mixed transportation pump, thereby reducing production and use costs and improving economic benefits.

[0017] Oil and gas enter the outer casing. Due to gravity, the gas is concentrated at the top of the outer casing, and the liquid is in the lower part of the tube body. The gas enters the inner casing from the inlet, and at the same time, the liquid flows into the inner casing from the first through hole, the second through hole and the third through hole distributed on the surface of the inner casing. Since the apertures of the first through hole, the second through hole and the third through hole are different, the flow rate flowing into the inner casing can be controlled. When the liquid level reaches the upper and lower limits of the liquid level controller, the liquid level controller feeds back a signal to the control system, and adjusts the running speed of the mixed pump accordingly to meet the pump's transportation requirements for the imported mixed medium.

[0018] When the device is used for single-phase mixed gas transportation, when the mixed gas in the pipe body has excess pressure, the pressure regulating valve opens to control the input of the mixed gas. When the mixed gas in the pipe body cannot meet the demand of the mixed delivery pump, the pressure regulating valve closes to ensure that sufficient mixed gas enters the pipe body through the air pipe to meet the demand.

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the utility model;

[0021] Figure 2 This is a schematic diagram of the inner sleeve structure in Example 1 of the utility model;

[0022] Figure 3 It is a schematic diagram of the overall structure in Example 2 of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the air intake pipe assembly in Example 2 of the utility model.

[0024] In the figure: 1-base; 2-outer sleeve; 22-tube body; 23-tube cover; 24-drain outlet; 25-air outlet; 26-oil and gas inlet; 27-oil and gas inlet pipe; 3-inner sleeve group; 31-inner sleeve; 32-straight hole group; 320-first through hole; 321-second through hole; 322-third through hole; 33-closed end; 34-inlet; 35-outlet; 36-mixing pipe; 4-inlet pipe assembly; 41-air pipe; 42-one-way valve; 43-pressure regulating valve; 5-drain pipe; 6-liquid level controller. DETAILED DESCRIPTION

[0025] Example 1: Figure 1-2As shown, an oil and gas mixed delivery pump inlet gas-liquid ratio control and delivery device comprises a base 1, on which an outer sleeve 2 is fixedly mounted, the outer sleeve 2 is connected with a sewage pipe 5 on the side wall near the bottom, an oil and gas inlet pipe 27 is connected on the side wall of the outer sleeve 2 above the sewage pipe 5, an inner sleeve group 3 is arranged inside the outer sleeve 2, one end of the inner sleeve group 3 near the bottom is connected with a mixing pipe 36, the mixing pipe 36 penetrates the inner wall of the outer sleeve 2 at the same time, an air intake pipe assembly 4 is connected on the outer wall of the outer sleeve 2 above the oil and gas inlet pipe 27, and a liquid level controller 6 is arranged on the outer wall of the outer sleeve 2 at a position opposite to the air intake pipe assembly 4.

[0026] The outer sleeve 2 includes a tube body 22 fixedly mounted on the base 1 , and one end of the tube body 22 close to the base 1 is configured as a sealing end.

[0027] A tube cover 23 is sealedly mounted on the top of the tube body 22. With this design, the interior of the outer sleeve 2 is a sealed space.

[0028] A sewage outlet 24 is formed on the pipe body 22 at a position corresponding to the sewage discharge pipe 5 , and the sewage discharge pipe 5 is connected to the sewage outlet 24 .

[0029] The sewage pipe 5 is also provided with a control valve, which is not indicated in the figure. When a lot of sediment is deposited at the bottom of the pipe body 22, the sewage pipe 5 is connected through the control valve to discharge the sediment in the pipe body 22.

[0030] The control valve is electrically connected to the control system of the oil-gas mixed transmission pump through electric wires.

[0031] The other end of the sewage pipe 5 is connected to a sediment treatment device, and the sediment discharged from the pipe body 22 enters the sediment treatment device for further treatment to avoid polluting the surrounding environment.

[0032] In this embodiment 1, the sediment disposal device is a commonly used device in this field, and the specific principle will not be repeated here.

[0033] An oil and gas inlet 26 is formed on the tube body 22 at a position corresponding to the oil and gas inlet pipe 27 , and the oil and gas inlet pipe 27 is in communication with the oil and gas inlet 26 .

[0034] The other end of the oil and gas inlet pipe 27 is communicated with the oil and gas delivery pipeline in the field.

[0035] The mixing pipe 36 passes through the outer sleeve 2 and is connected with the inner sleeve group 3 by welding.

[0036] The inner sleeve group 3 includes an inner sleeve 31 disposed inside the tube body 22 , and a closed end 33 is disposed near the bottom end of the tube body 22 .

[0037] The other end of the inner sleeve 31 is provided with an inlet 34 .

[0038] An output port 35 is formed at a position of the inner sleeve 31 corresponding to the mixing flow tube 36 , and the inner sleeve 31 is communicated with the output port 35 .

[0039] A through hole group 32 is provided on the outer wall of the inner sleeve 31 .

[0040] The through hole group 32 includes a plurality of first through holes 320 arranged in an annular array on the outer wall of the inner sleeve 31 near the closed end 33 .

[0041] The outer wall of the inner sleeve 31 has a plurality of second through holes 321 in an annular array above the first through hole 320 .

[0042] The outer wall of the inner sleeve 31 has a plurality of third through holes 322 in an annular array above the second through holes 321 .

[0043] The aperture of the first through hole 320 is smaller than that of the second through hole 321 , and the aperture of the third through hole 322 is larger than that of the second through hole 321 .

[0044] The other end of the mixing pipe 36 is communicated with the inlet of the oil-gas mixing pump.

[0045] With such a design, when in use, after the oil-gas multiphase mixture enters the outer casing 2 through the oil-gas inlet pipe 27, the gas portion rises to the upper end position inside the outer casing 2. When the gas portion increases, the gas portion enters the inner casing 31 from the inlet port 34 and is then output through the mixing pipe 36.

[0046] During this period, as the liquid level in the tube body 22 gradually rises, the liquid portion enters the inner casing 31 from the first through hole 320 , the second through hole 321 and the third through hole 322 in sequence, and is then output to the inlet of the oil-gas mixed flow pump through the mixing pipe 36 .

[0047] When the liquid level in the tube body 22 is higher than the inlet 34 of the inner sleeve 31 , the liquid and gas parts simultaneously enter the inner sleeve 31 from the inlet 34 and are then output to the inlet of the oil-gas mixed delivery pump through the mixing pipe 36 .

[0048] With this design, when the liquid in the oil-gas multiphase mixture passes through the first through hole 320, the second through hole 321 and the third through hole 322, which are roughly small in diameter, part of the pressure entering the inner casing 31 can be relieved. At the same time, the gas in the oil-gas multiphase mixture enters from the inlet 34 and remixes with the liquid in the inner casing 31 into a suitable ratio, thereby ensuring smooth transportation, avoiding the generation of slug flow, and ensuring stable operation.

[0049] The control end of the liquid level controller 6 is connected to the control system of the oil and gas mixed pump by wire. In the prior art, the principle of the liquid level controller 6 is to monitor the position of the liquid in real time through a sensor. When the liquid level reaches the preset upper and lower limits, the sensor will send a signal to the controller. The controller determines the current liquid level status based on the received signal and sends corresponding control instructions to the actuator to realize automatic control of the liquid level. This technology is well known and will not be repeated here.

[0050] When the liquid level in the pipe body 22 reaches the upper limit preset by the liquid level controller 6, the signal is fed back to the control system, and the control system drives the motor speed of the oil-gas mixed flow pump to slow down, so as to slow down the flow rate of the multiphase oil-gas mixture flowing into the pipe body 22, and the gas part and the liquid part entering the inner casing 31 are slowed down at the same time, and the gas-liquid ratio is adjusted automatically, so as to ensure that the multiphase oil-gas mixture entering the inlet of the oil-gas mixed flow pump has a suitable gas-liquid ratio, thereby further ensuring stable operation.

[0051] Example 2: Figure 3-4 As shown, an oil-gas mixed pump inlet gas-liquid ratio control and delivery device is based on Example 1 and has an air inlet pipe assembly 4 connected to the outer wall of the outer sleeve 2 near the upper end.

[0052] The air intake pipe assembly 4 includes an air pipe 41 connected to the pipe body 22 , and a one-way valve 42 is connected to the air pipe 41 near the pipe body 22 .

[0053] The air pipe 41 is connected to a pressure regulating valve 43 near the one-way valve 42 .

[0054] The other end of the gas pipe 41 is communicated with a pipeline for transporting mixed gas in petroleum transportation.

[0055] In Example 2, the device is used for mixed gas delivery. When in use, the control valve is in a closed state, and the mixed gas enters the tube body 22 through the air pipe 41, and then enters the inner sleeve 31 through the inlet 34, and then is output to the inlet of the mixed delivery pump through the mixing pipe 36.

[0056] The function of the one-way valve 42 is to prevent the mixed gas in the tube body 22 from flowing back.

[0057] When the mixed gas in the tube body 22 has an excess pressure, the pressure regulating valve 43 opens to control the input of the mixed gas. When the mixed gas in the tube body 22 cannot meet the demand of the mixed delivery pump, the pressure regulating valve 43 closes to ensure that a sufficient amount of mixed gas enters the tube body 22 through the air pipe 41 to meet the demand.

[0058] In this embodiment 2, the working principles of the one-way valve 42 and the pressure regulating valve 43 are well known in the prior art and will not be described in detail here.

[0059] For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and deformations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A gas-liquid ratio control and delivery device for an oil-gas mixed delivery pump, comprising a base (1), characterized in that: An outer sleeve (2) is fixedly mounted on the base (1); a sewage discharge pipe (5) is connected to the side wall of the outer sleeve (2) near the bottom; an oil and gas inlet pipe (27) is connected to the side wall of the outer sleeve (2) at a position above the sewage discharge pipe (5); an inner sleeve group (3) is arranged inside the outer sleeve (2); a mixing pipe (36) is connected to one end of the inner sleeve group (3) near the bottom; the mixing pipe (36) simultaneously penetrates the inner wall of the outer sleeve (2); an air inlet pipe assembly (4) is connected to the outer wall of the outer sleeve (2) at a position above the oil and gas inlet pipe (27); and a liquid level controller (6) is arranged on the outer wall of the outer sleeve (2) at a position opposite to the air inlet pipe assembly (4).

2. The oil-gas mixed pump inlet gas-liquid ratio control and delivery device according to claim 1, characterized in that: The outer sleeve (2) comprises a tube body (22) fixedly mounted on the base (1), and a tube cover (23) is sealingly mounted on the top end of the tube body (22).

3. The oil-gas mixed pump inlet gas-liquid ratio control and delivery device according to claim 2, characterized in that: A sewage outlet (24) is provided on the pipe body (22) at a position corresponding to the sewage discharge pipe (5), and the sewage discharge pipe (5) is in communication with the sewage outlet (24); an oil and gas inlet (26) is provided on the pipe body (22) at a position corresponding to the oil and gas inlet pipe (27), and the oil and gas inlet pipe (27) is in communication with the oil and gas inlet (26).

4. The oil-gas mixed pump inlet gas-liquid ratio control and delivery device according to claim 3, characterized in that: The sleeve group (3) comprises an inner sleeve (31) arranged inside the tube body (22); a closed end (33) is arranged near the bottom end of the tube body (22); an output port (35) is provided at a position of the inner sleeve (31) corresponding to the mixing tube (36); the inner sleeve (31) is communicated with the output port (35); and a straight through hole group (32) is arranged on the outer wall of the inner sleeve (31).

5. The oil-gas mixed delivery pump inlet gas-liquid ratio control delivery device according to claim 4, characterized in that: The through hole group (32) comprises a plurality of first through holes (320) arranged in an annular array at a position on the outer wall of the inner sleeve (31) close to the closed end (33), a plurality of second through holes (321) arranged in an annular array at a position above the first through holes (320) on the outer wall of the inner sleeve (31), and a plurality of third through holes (322) arranged in an annular array at a position above the second through holes (321) on the outer wall of the inner sleeve (31); the aperture of the first through hole (320) is smaller than the aperture of the second through hole (321), and the aperture of the third through hole (322) is larger than the aperture of the second through hole (321).

6. The device for controlling the gas-liquid ratio of the inlet of an oil-gas mixed delivery pump according to claim 5, characterized in that: An air intake pipe assembly (4) is connected to the outer wall of the outer sleeve (2) near the upper end.

7. The oil-gas mixed pump inlet gas-liquid ratio control and delivery device according to claim 6, characterized in that: The air inlet pipe assembly (4) comprises an air pipe (41) connected to the pipe body (22); a position of the air pipe (41) close to the pipe body (22) is connected to a one-way valve (42); and a position of the air pipe (41) close to the one-way valve (42) is connected to a pressure regulating valve (43).

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