Ultra-long-stroke piston type high-gas-content multiphase pump

Abstract

The invention discloses an ultra-long stroke piston type high-gas-content mixed transportation pump, which belongs to the field of multiphase flow mixed transportation, comprises a cylinder body A, a cylinder body B, a radiator, a liquid delivery pump, an energy storage tank, a two-position four-way cartridge valve and a controller, and is characterized in that isolation pistons with strokes not less than 0.8 m are arranged in the cylinder body A and the cylinder body B, and separate respective inner cavities into transportation cavities and power cavities; a plurality of mud scraping rings, sealing rings and supporting rings are arranged on the isolation pistons, a liquid conveying pump is used for being connected with the two power cavities through a two-position four-way cartridge valve to drive the two isolation pistons to reciprocate in a staggered mode, cooling cavities are formed in the peripheries of the conveying cavity and the power cavities, and an ultra-long stroke piston cylinder is combined with a cooling system. The cylinder body and the power liquid are cooled through the radiator at the same time, high-gas-liquid-ratio, pure-gas and large-flow multiphase flow can be conveyed, the reversing frequency is greatly reduced, the operation stability and conveying efficiency of equipment under the severe working condition are remarkably improved, and the service life of the equipment under the severe working condition is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of multiphase flow mixed transportation, and particularly relates to an ultra-long stroke piston type mixed transportation pump capable of transporting high gas rate or even pure gas for oil and gas field exploitation. BACKGROUND

[0002] In the field of oil and gas field gathering and transportation, especially in the exploitation process of deep sea oil fields and marginal oil fields, in order to reduce equipment investment and operation cost, a multiphase flow mixed transportation process is often used, that is, a mixed transportation pump is used to directly transport the multiphase flow of oil, gas and water produced from the well to the processing facility, thereby saving the pre-separation link. At present, the pump types suitable for multiphase flow mixed transportation mainly include single screw pump, double screw pump and traditional piston type volumetric pump, etc. However, these pump types all have obvious technical bottlenecks when dealing with high gas rate medium.

[0003] The stator of the single screw pump is usually made of rubber. Under high gas rate working condition, the heat generated by gas compression and friction is difficult to effectively dissipate, which causes the rubber stator to accelerate aging, deformation and even ablation under heat, and the service life is significantly shortened.

[0004] The double screw pump has certain gas-liquid mixed transportation capacity, but the gap between the rotors is extremely precise. If the medium contains solid particles, it is easy to cause wear. Under high gas rate working condition, the volumetric efficiency is seriously reduced, the heat problem further aggravates the gap leakage, and the operation stability and efficiency are rapidly deteriorated.

[0005] The traditional piston pump is limited by the crank slider mechanism, and the ratio of the piston stroke to the piston diameter is small. The piston stroke is usually twice the radius of the crank, only tens to hundreds of millimeters. The too short stroke causes the high-pressure gas remaining in the cylinder after the compression stroke to occupy too much effective volume during the expansion stage, greatly reducing the effective stroke, seriously affecting the total amount of mixed transportation medium entering, causing the "gas lock" phenomenon, and the higher the gas rate of the mixed transportation medium, the more serious the problem, which causes the efficiency of the pump to drop sharply or even unable to work normally.

[0006] In order to solve the above problems, some improved mixed transportation devices have appeared in the prior art. For example, Chinese invention patent CN109114433A discloses a "double-cavity liquid reciprocating drive multiphase flow mixed transportation method and device", which alternately forms a vacuum suction chamber and a compression discharge chamber through left and right double-tank structures, so that the power pump only circulates the working liquid, thereby avoiding the direct impact of the multiphase medium on the pump body, and to some extent, the applicability of the ordinary water pump under multiphase flow working condition is expanded.

[0007] The technical scheme still faces some challenges in actual application. Since there is no piston isolation, gas is easily dissolved in the circulating liquid under high pressure, and part of it will separate from the liquid after the pressure decreases, affecting the accuracy of liquid level detection and leading to control failure. There is no treatment measure for solid particles, which will damage the power pump after being sucked in. When conveying pure gas, the conveying medium directly contacts the circulating liquid, which may cause the medium to mix into the circulating liquid, limiting its use range. The overall flow of the system is difficult to improve due to the limited diameter of the electromagnetic valve, and it is difficult to adapt to the demand for large flow mixed conveying. Only vertical installation is supported, which is inconvenient for maintenance and difficult to maintain.

[0008] Therefore, the existing mixed conveying technology still has the problems of poor reliability, low efficiency, weak adaptability and medium mixing risk under high gas content conditions, and the industry urgently needs to develop an innovative mixed conveying pump device with reasonable structure, which can completely isolate the medium, adapt to high gas content, have large flow conveying capacity, and be stable and long in service life, to fill the current technical gap and promote the development of multi-phase flow mixed conveying technology to a more efficient and reliable direction. SUMMARY

[0009] The purpose of the present application is to provide a mixed conveying pump for conveying high gas content or even pure gas in the fields of oil and natural gas.

[0010] A kind of super long stroke piston type high gas content mixed conveying pump, including cylinder body A, cylinder body B, radiator, liquid conveying pump, energy storage tank, two-position four-way cartridge valve and controller, the cylinder body A and cylinder body B are core execution unit, its inside is respectively provided with stroke not less than 0.8 meter cylinder body A isolation piston and cylinder body B isolation piston, preferably, the ratio of piston stroke and piston diameter is not less than 5, the super long stroke design provides sufficient expansion space for the high-pressure gas of last cycle residue, so that its pressure can be reduced below the inlet pressure, the cylinder body A isolation piston seals the inner cavity of cylinder body A into cylinder body A transport cavity and cylinder body A power cavity, the cylinder body B isolation piston seals the inner cavity of cylinder body B into cylinder body B transport cavity and cylinder body B power cavity, the transport cavity is used to convey high gas content or even pure gas medium, and the power cavity is used to receive hydraulic power fluid.

[0011] On the medium flow path, the upper part of the circumferential side wall of the cylinder body A transport cavity and the cylinder body B transport cavity is respectively provided with a cylinder body A inlet check valve and a cylinder body B inlet check valve connected with a multi-phase flow inlet, for one-way suction of medium, and the lower part of the circumferential side wall of the cylinder body A transport cavity and the cylinder body B transport cavity is respectively provided with a cylinder body A outlet check valve and a cylinder body B outlet check valve connected with a multi-phase flow outlet, for one-way discharge of medium.

[0012] On the power fluid flow path, the cylinder A power chamber and the cylinder B power chamber end are respectively provided with a cylinder A on-off valve and a cylinder B on-off valve, the liquid delivery pump is connected with the cylinder A on-off valve and the cylinder B on-off valve through the two-position four-way cartridge valve, the power fluid is alternately input and output to the power chambers of the two cylinders through the two-position four-way cartridge valve, and the drive isolation piston is driven to alternately reciprocate linearly.

[0013] The control core of the mixed delivery pump is a controller, the cylinder A transport chamber and the cylinder B transport chamber end are respectively provided with a cylinder A left stroke switch and a cylinder B left stroke switch, the cylinder A power chamber and the cylinder B power chamber end are respectively provided with a cylinder A right stroke switch and a cylinder B right stroke switch, the left and right stroke switches are limit motion positions of the isolation piston, the cylinder A left stroke switch, the cylinder B left stroke switch, the cylinder A right stroke switch and the cylinder B right stroke switch are electrically connected with the controller through signal lines, the controller is electrically connected with the reversing valve of the two-position four-way cartridge valve, and when the isolation piston moves to the stroke switch, the stroke switch triggers a reversing signal.

[0014] The controller is configured to control the reversing of the two-position four-way cartridge valve according to the signals of the stroke switches, so that the cylinder A isolation piston and the cylinder B isolation piston alternately reciprocate linearly.

[0015] In order to solve the heat generated by compression and friction of the high gas-containing medium, an efficient cooling system is arranged, the cylinder A further comprises a cylinder A cooling chamber arranged around the cylinder A transport chamber and the cylinder A power chamber, the cylinder B further comprises a cylinder B cooling chamber arranged around the cylinder B transport chamber and the cylinder B power chamber, the cylinder A cooling chamber is provided with a cylinder A cooling liquid inlet and a cylinder A cooling liquid outlet, and the cylinder B cooling chamber is provided with a cylinder B cooling liquid inlet and a cylinder B cooling liquid outlet.

[0016] The radiator is provided with a cooling liquid pipeline and a power fluid pipeline, the cooling liquid pipeline connects the cylinder A cooling liquid inlet and the cylinder B cooling liquid outlet, and the power fluid pipeline connects the pump outlet of the liquid delivery pump and the two-position four-way cartridge valve, so that the cylinder and the power fluid are effectively cooled.

[0017] The inlet and outlet of the energy storage tank are provided with a pressure regulating valve, the pressure regulating valve connects the energy storage tank to the outlet side of the liquid delivery pump, the energy storage tank is used for stabilizing the hydraulic system pressure in the reversing process, absorbing pulsation and ensuring the stability of power supply.

[0018] The two-position four-way cartridge valve is provided with a cartridge valve A port, a cartridge valve B port, a cartridge valve P port and a cartridge valve T port, the cylinder A on-off valve and the cylinder B on-off valve are connected to the cartridge valve A port and the cartridge valve B port respectively, the pump outlet of the liquid delivery pump is connected to the pressure regulating valve of the energy storage tank and the cartridge valve P port through pipelines respectively, and the pump inlet of the liquid delivery pump is connected to the cartridge valve T port through the power fluid pipeline, so that a complete hydraulic circulating loop is formed.

[0019] The axial direction of the cylinder A isolation piston and the cylinder B isolation piston is provided with a plurality of mud scraping rings, sealing rings and supporting rings, the mud scraping rings are located close to the transportation cavity and scrape away the mud and sand on the wall surface, and the outlet one-way valve is used for discharging away, and the inside of the isolation piston is provided with oil guiding holes for guiding the power fluid in the power cavity to the sealing ring area, so as to play a lubricating and pressure balancing role.

[0020] The controller is configured to perform the following control cycle: The reversing valve of the two-position four-way cartridge valve is controlled to be in the first station, so that the power fluid enters the cylinder B power cavity from the liquid delivery pump through the cartridge valve P port, and drives the cylinder B isolation piston to move to the cylinder B transportation cavity direction, at the same time, the power fluid in the cylinder A power cavity returns to the pump inlet of the liquid delivery pump through the cartridge valve A port, and drives the cylinder A isolation piston to move to the cylinder A power cavity direction.

[0021] When the cylinder A isolation piston triggers the cylinder A right stroke switch and the cylinder B isolation piston triggers the cylinder B left stroke switch, the reversing valve of the two-position four-way cartridge valve is switched to the second station.

[0022] In the second station, the power fluid enters the cylinder A power cavity from the liquid delivery pump through the cartridge valve P port, and drives the cylinder A isolation piston to move to the cylinder A transportation cavity direction, at the same time, the power fluid in the cylinder B power cavity returns to the pump inlet of the liquid delivery pump through the cartridge valve B port, and drives the cylinder B isolation piston to move to the cylinder B power cavity direction.

[0023] When the cylinder A isolation piston triggers the cylinder A left stroke switch and the cylinder B isolation piston triggers the cylinder B right stroke switch, the reversing valve of the two-position four-way cartridge valve is switched back to the first station, so that the continuous and stable delivery of the medium is realized.

[0024] Compared with the prior art, the present application has the following advantages: (1) The gas lock can be solved: the medium with a gas content of more than 90% or even pure gas can be processed, through the "ultra-long stroke" design, sufficient physical space is provided for the high-pressure gas remaining in the last cycle to expand to below the inlet pressure, so that the effective volume of the next suction stroke is ensured, and the "gas lock" phenomenon is fundamentally eliminated.

[0025] (2) With heat dissipation capacity: the power liquid heat dissipation and cylinder cooling are integrated, the structure is compact, the heat management efficiency is extremely high, the medium compression heat and friction heat are effectively controlled, and the reliability and service life of the sealing system and the whole machine are greatly improved.

[0026] (3) With wear resistance and sealing property: the composite ring group design of multiple mud scraping rings, sealing rings and support rings on the isolation piston can effectively deal with sand-containing medium and prevent particulate matter from damaging the seal, and meanwhile, the theoretical pressure difference on both sides of the piston is zero during the working process, and the required sealing pressure difference is very low during actual work, so that the stability of long-period operation is ensured.

[0027] (4) Stable operation and intelligence: the closed-loop control based on position sensing realizes precise switching and alternating reciprocating linear motion of double-cylinder hydraulic drive, greatly reduces the frequency of commutation, the output flow is extremely stable, the pressure pulsation is small, the degree of automation is high, and it is especially suitable for oil and gas mixed transportation scenes with complex working conditions.

[0028] In addition, the structure of the present application is compact, high in integration, easy to realize pry installation design, and convenient for rapid deployment and transfer in the oilfield site. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the principle schematic diagram of the super-long stroke piston type high gas rate mixed transportation pump of the present application; Figure 2 is the principle schematic diagram after commutation of the present application; Figure 3 is the structure schematic diagram of the isolation piston; Figure 4 is the schematic diagram of pry installation application of the present application; Figure 5 is the schematic diagram of four-cylinder pry installation application of the present application; In the figure: 1, multiphase flow inlet; 2, multiphase flow pipeline; 3, multiphase flow outlet; 4, cylinder A; 4-1, cylinder A transport cavity; 4-2, cylinder A cooling cavity; 4-3, cylinder A isolation piston; 4-4, cylinder A power cavity; 4-5, cylinder A inlet check valve; 4-6, cylinder A outlet check valve; 4-7, cylinder A left stroke switch; 4-8, cylinder A right stroke switch; 4-9, cylinder A cooling liquid inlet; 4-10, cylinder A cooling liquid outlet; 4-11, cylinder A switch valve; 5, cylinder B; 5-1, cylinder B transport cavity; 5-2, cylinder B cooling cavity; 5-3, cylinder B isolation piston; 5-4, cylinder B power cavity; 5-5, cylinder B inlet check valve; 5-6, cylinder B outlet check valve; 5-7, cylinder B left stroke switch; 5-8, cylinder B right stroke switch; 5-9, cylinder B cooling liquid inlet; 5-10, cylinder B cooling liquid outlet; 5-11, cylinder B switch valve; 6, cooling liquid pipeline; 7, radiator; 8, power liquid pipeline; 9, liquid delivery pump; 9-1, pump inlet; 9-2, pump outlet; 9-3, pump motor; 10, energy storage tank; 10-1, pressure regulating valve; 11, two-position four-way cartridge valve; 11-1, reversing valve; 11-2, cartridge valve A port; 11-3, cartridge valve P port; 11-4, cartridge valve B port; 11-5, cartridge valve T port; 12, signal line; 13, controller; 14, wiper ring; 15, seal ring; 16, support ring; 17, second seal ring; 18, oil guide hole; 19, cylinder C; 20, cylinder D. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0031] Embodiment 1: as Figures 1-3As shown, a kind of super long stroke piston high gas rate mixed transport pump, including cylinder body A4, cylinder body B5, radiator 7, liquid delivery pump 9, energy storage tank 10, two-position four-way cartridge valve 11 and controller 13, cylinder body A4 and cylinder body B5 two cylinder structures are completely same, preferably using high strength, high thermal conductivity material, such as alloy steel, aluminum alloy or other metal materials satisfying the mechanical and thermal performance requirements, to withstand internal pressure and facilitate heat dissipation, cylinder body A4 is provided with cylinder body A isolation piston 4-3, cylinder body B5 is provided with cylinder body B isolation piston 5-3, to realize super long stroke stable transport, the stroke of isolation piston is designed to be not less than 0.8 meters, preferably the piston stroke is designed to be 2 meters-4 meters, preferably the piston diameter is 0.15 meters-0.4 meters, reduce the number of commutation of isolation piston per unit time, thereby reducing the flow and pressure pulsation caused by commutation, improve the transport stability, especially suitable for high gas rate medium sensitive to pulsation, isolation piston preferably uses lightweight alloy material to reduce mass, and its inside is processed with weight-reducing blind hole, to effectively reduce the inertial impact generated when it commutes at stroke end;Cylinder body A isolation piston 4-3 seals the inner cavity of cylinder body A4 into cylinder body A transport cavity 4-1 and cylinder body A power cavity 4-4, cylinder body B isolation piston 5-3 seals the inner cavity of cylinder body B5 into cylinder body B transport cavity 5-1 and cylinder body B power cavity 5-4.

[0032] On the medium flow path, the upper parts of the circumferential side walls of cylinder body A transport cavity 4-1 and cylinder body B transport cavity 5-1 are respectively provided with cylinder body A inlet check valve 4-5 and cylinder body B inlet check valve 5-5 connected with multiphase flow inlet 1, and the lower parts of the circumferential side walls of cylinder body A transport cavity 4-1 and cylinder body B transport cavity 5-1 are respectively provided with cylinder body A outlet check valve 4-6 and cylinder body B outlet check valve 5-6 connected with multiphase flow outlet 3, the outlet check valve is arranged at the lower part of the transport cavity, which is beneficial to discharge the solid particles deposited in the cylinder bottom when discharging the medium.

[0033] On the power fluid flow path, the end parts of cylinder body A power cavity 4-4 and cylinder body B power cavity 5-4 are respectively provided with cylinder body A on-off valve 4-11 and cylinder body B on-off valve 5-11, and liquid delivery pump 9 is connected with cylinder body A on-off valve 4-11 and cylinder body B on-off valve 5-11 through two-position four-way cartridge valve 11.

[0034] The cylinder A transport cavity 4-1 and the cylinder B transport cavity 5-1 end are respectively provided with the cylinder A left stroke switch 4-7 and the cylinder B left stroke switch 5-7, the cylinder A power cavity 4-4 and the cylinder B power cavity 5-4 end are respectively provided with the cylinder A right stroke switch 4-8 and the cylinder B right stroke switch 5-8, the cylinder A left stroke switch 4-7, the cylinder B left stroke switch 5-7, the cylinder A right stroke switch 4-8 and the cylinder B right stroke switch 5-8 are electrically connected with the controller 13 through the signal line 12, the controller 13 is electrically connected with the reversing valve 11-1 of the two-position four-way cartridge valve 11, and the controller 13 is configured to control the two-position four-way cartridge valve 11 to reverse according to the signal of the stroke switch, so that the cylinder A isolation piston 4-3 and the cylinder B isolation piston 5-3 are alternately reciprocated linearly.

[0035] In order to effectively manage the heat generated during operation, the cylinder A 4 further comprises a cylinder A cooling cavity 4-2 arranged around the cylinder A transport cavity 4-1 and the cylinder A power cavity 4-4, and the cylinder B 5 further comprises a cylinder B cooling cavity 5-2 arranged around the cylinder B transport cavity 5-1 and the cylinder B power cavity 5-4, the cylinder A cooling cavity 4-2 is provided with a cylinder A cooling liquid inlet 4-9 and a cylinder A cooling liquid outlet 4-10, and the cylinder B cooling cavity 5-2 is provided with a cylinder B cooling liquid inlet 5-9 and a cylinder B cooling liquid outlet 5-10; the radiator 7 is provided with a cooling liquid pipeline 6 and a power liquid pipeline 8, the cooling liquid pipeline 6 connects the cylinder A cooling liquid inlet 4-9 and the cylinder B cooling liquid outlet 5-10, and the power liquid pipeline 8 connects the pump outlet 9-2 of the liquid delivery pump 9 and the two-position four-way cartridge valve 11; the double-circuit integrated cooling design realizes efficient heat dissipation of the two cylinders and the power liquid through a single radiator at the same time, and ensures the thermal stability of the system.

[0036] The pressure regulating valve 10-1 is arranged at the inlet and outlet of the energy storage tank 10, the pressure regulating valve 10-1 connects the energy storage tank 10 to the outlet side of the liquid delivery pump 9, the pressure regulating valve 10-1 is used for setting and stabilizing the working pressure of the system, the energy storage tank 10 is used for absorbing hydraulic pulsation, providing instantaneous large-flow supplement, ensuring the stability of the system pressure, and accurately setting and stabilizing the working pressure of the system.

[0037] The two-position four-way cartridge valve 11 is provided with a cartridge valve A port 11-2, a cartridge valve B port 11-4, a cartridge valve P port 11-3 and a cartridge valve T port 11-5, the cylinder A on-off valve 4-11 and the cylinder B on-off valve 5-11 are connected to the cartridge valve A port 11-2 and the cartridge valve B port 11-4 respectively, the pump outlet 9-2 of the liquid delivery pump 9 is connected to the pressure regulating valve 10-1 of the energy storage tank 10 and the cartridge valve P port 11-3 through pipelines respectively, and the pump inlet 9-1 of the liquid delivery pump 9 is connected to the cartridge valve T port 11-5 through the power liquid pipeline 8.

[0038] As Figure 3As shown, the axial direction of the cylinder A isolation piston 4-3 and the cylinder B isolation piston 5-3 is provided with a plurality of mud scraping rings 14, sealing rings 15 and support rings 16, and as a preferred solution, the axial direction of the isolation piston is sequentially provided with a mud scraping ring 14, a sealing ring 15, a support ring 16 and a second sealing ring 17, and the mud scraping ring 14 is located close to the end of the transport cavity; the primary function of the mud scraping ring 14 is to scrape off the solid impurities attached to the cylinder wall to prevent them from entering the sealing area and to protect the subsequent sealing elements; the sealing ring 15 and the second sealing ring 17 constitute a main sealing system, bear the working pressure and ensure the absolute isolation between the transport cavity and the power cavity, and the double sealing design greatly improves the sealing reliability; the support ring 16 is located between the two sealing rings and mainly plays a guiding and supporting role to prevent the piston from being deflected during long-stroke operation; the integrated piston structure with mud scraping, double sealing and pressure oil lubrication ensures the long-term reliable isolation between the power cavity and the transport cavity.

[0039] As a preferred embodiment, at least one oil guide hole 18 is processed in the isolation piston, in this embodiment, eight oil guide holes 18 are provided, four oil guide holes 18 are provided on each side of the support ring 16 and are distributed symmetrically in the circumferential direction, the oil guide hole 18 is drilled from the blind hole circumferential surface of the isolation piston and radially penetrates to the outer circumference of the piston, which functions to introduce the pressure power fluid on the power cavity side to the ring groove area where the sealing ring 15, the support ring 16 and the second sealing ring 17 are located, lubricate the sealing friction pair and play a certain pressure balancing role, which ultimately significantly prolongs the service life of the sealing assembly.

[0040] In terms of control and detection, the controller 13 is configured to perform the following control cycle: The reversing valve 11-1 of the two-position four-way cartridge valve 11 is controlled to be in the first position, so that the power fluid enters the cylinder B power cavity 5-4 from the liquid delivery pump 9 through the cartridge valve P port 11-3, and drives the cylinder B isolation piston 5-3 to move towards the cylinder B transport cavity 5-1, at the same time, the power fluid in the cylinder A power cavity 4-4 returns to the pump inlet 9-1 of the liquid delivery pump 9 through the cartridge valve A port 11-2, and drives the cylinder A isolation piston 4-3 to move towards the cylinder A power cavity 4-4.

[0041] When the cylinder A isolation piston 4-3 triggers the cylinder A right stroke switch 4-8 and the cylinder B isolation piston 5-3 triggers the cylinder B left stroke switch 5-7, the reversing valve 11-1 of the two-position four-way cartridge valve 11 is switched to the second position.

[0042] At the second station, the power fluid from the liquid delivery pump 9 enters the cylinder A power cavity 4-4 through the plug valve P port 11-3, and drives the cylinder A isolation piston 4-3 to move to the cylinder A transport cavity 4-1 direction, at the same time, the power fluid in the cylinder B power cavity 5-4 returns to the pump inlet 9-1 of the liquid delivery pump 9 through the plug valve B port 11-4, and drives the cylinder B isolation piston 5-3 to move to the cylinder B power cavity 5-4 direction.

[0043] When the cylinder A isolation piston 4-3 triggers the cylinder A left stroke switch 4-7 and the cylinder B isolation piston 5-3 triggers the cylinder B right stroke switch 5-8, the reversing valve 11-1 of the two-position four-way plug valve 11 switches back to the first station.

[0044] The working process of the present application is as follows: After the equipment is first enabled or overhauled, the hydraulic system needs to be initially filled with liquid and vented, and the specific steps are as follows: System isolation: close the cylinder A switch valve 4-11, the cylinder B switch valve 5-11 and the pressure regulating valve 10-1 at the inlet of the energy storage tank 10, then disconnect the pipeline connection between the cylinder A switch valve 4-11 and the cylinder B switch valve 5-11 and the two-position four-way plug valve 11, and simultaneously disconnect the connection between the energy storage tank 10 and the outlet of the liquid delivery pump 9.

[0045] Power cavity vacuumizing and liquid filling: through the cylinder A switch valve 4-11 and the cylinder B switch valve 5-11, vacuumize the cylinder A power cavity 4-4 and the cylinder B power cavity 5-4 respectively using a vacuum pump, under the action of negative pressure, move to the positions of triggering the cylinder A right stroke switch 4-8 and the cylinder B right stroke switch 5-8 respectively, then repeatedly inject clean power fluid into the two power cavities, and gently knock the pipeline and the cylinder to ensure that the air in the cavity is completely discharged.

[0046] Piston initial positioning: accurately adjust the final positions of the two isolation pistons by temporarily connecting an external hydraulic source or manually adjusting, so that the cylinder A isolation piston 4-3 is stably positioned at the cylinder A left stroke switch 4-7, and the cylinder B isolation piston 5-3 is stably positioned at the cylinder B right stroke switch 5-8, which is the starting point of the system alternating reciprocating motion.

[0047] Energy storage tank liquid filling and system recovery: inject power fluid with a certain pressure into the energy storage tank 10 to provide necessary pressure buffer and compensation for the hydraulic system, after completing the above steps, reconnect the cylinder A switch valve 4-11 and the cylinder B switch valve 5-11 to the two-position four-way plug valve 11, and restore the pipeline connection between the energy storage tank 10 and the outlet of the liquid delivery pump 9, thus the initial preparation of the system is completed, and the starting phase can be entered.

[0048] Reference Figure 1, the pump motor 9-3 of the liquid delivery pump 9 is started, the reversing valve 11-1 of the two-position four-way cartridge valve 11 is in the power-off state, that is, the first working position, the first and third of the four cone valves from left to right are opened, at this time, the P port 11-3 of the cartridge valve is communicated with the B port 11-4 of the cartridge valve, the A port 11-2 of the cartridge valve is communicated with the T port 11-5 of the cartridge valve, so that the power fluid flows from the P port 11-3 to the B port 11-4 of the cartridge valve, enters the cylinder B power cavity 5-4, and drives the cylinder B isolation piston 5-3 to move left, at the same time, the power fluid in the cylinder A power cavity 4-4 flows to the pump inlet 9-1 of the liquid delivery pump 9 through the A port 11-2 of the cartridge valve and the T port 11-5 of the cartridge valve, at this time, the cylinder A transport cavity 4-1 inhales the medium, and the cylinder B transport cavity 5-1 discharges the medium.

[0049] At this time, the power fluid is located in the first flow direction (corresponding to the state of the cylinder A isolation piston 4-3 moving right and the cylinder B isolation piston 5-3 moving left) Figure 1 State): When the cylinder A isolation piston 4-3 moves right and the cylinder B isolation piston 5-3 moves left, the power fluid sequentially passes through: the cylinder A power cavity 4-4, the cylinder A switch valve 4-11, the A port 11-2 of the cartridge valve, the T port 11-5 of the cartridge valve, the power fluid pipeline 8 in the radiator 7, the pump inlet 9-1 of the liquid delivery pump 9, the pump outlet 9-2 of the liquid delivery pump 9, the P port 11-3 of the cartridge valve and the energy storage tank 10, the B port 11-4 of the cartridge valve, the cylinder B switch valve 5-11, and the cylinder B power cavity 5-4.

[0050] When the cylinder A isolation piston 4-3 moves to the right end to trigger the cylinder A right stroke switch 4-8, and the cylinder B isolation piston 5-3 moves to the left end to trigger the cylinder B left stroke switch 5-7, the two switch signals are sent to the controller 13 at the same time, triggering the reversing.

[0051] The controller 13 responds to this signal combination and immediately sends a reversing instruction to the reversing valve 11-1 of the two-position four-way cartridge valve 11 to perform the reversing.

[0052] Referring to Figure 2 , the reversing valve 11-1 is in the power-on state, that is, the second working position, the second and fourth of the four cone valves from left to right are opened, at this time, the P port 11-3 of the cartridge valve is communicated with the A port 11-2 of the cartridge valve, the B port 11-4 of the cartridge valve is communicated with the T port 11-5 of the cartridge valve, the power fluid is changed to flow from the P port to the A port, enters the cylinder A power cavity 4-4, and drives the cylinder A isolation piston 4-3 to move left, at the same time, the power fluid in the cylinder B power cavity 5-4 flows to the pump inlet 9-1 of the liquid delivery pump 9 through the B port 11-4 of the cartridge valve and the T port 11-5 of the cartridge valve, at this time, the cylinder A transport cavity 4-1 discharges the medium, the cylinder B transport cavity 5-1 inhales the medium, and the piston moves reversely.

[0053] At this time, the power fluid is located in the second flow direction (corresponding to the state of the cylinder A isolation piston 4-3 moving left and the cylinder B isolation piston 5-3 moving right) Figure 2(Status): When cylinder A isolation piston 4-3 moves to the left and cylinder B isolation piston 5-3 moves to the right, the power fluid passes through the following in sequence: cylinder B power chamber 5-4, cylinder B switching valve 5-11, cartridge valve B port 11-4, cartridge valve T port 11-5, power fluid line 8 in radiator 7, pump inlet 9-1 of liquid transfer pump 9, pump outlet 9-2 of liquid transfer pump 9, cartridge valve P port 11-3 and accumulator 10, cartridge valve A port 11-2, cylinder A switching valve 4-11, and cylinder A power chamber 4-4.

[0054] When the piston moves to the other end, triggering the left travel switch 4-7 of cylinder A and the right travel switch 5-8 of cylinder B, the controller 13 commands the reversal again. This cycle repeats, with the pistons of the two cylinders performing alternating linear motions in opposite directions, achieving continuous and stable delivery of the medium. At the moment of reversal, the hydraulic shock generated in the system is effectively absorbed and buffered by the accumulator 10, ensuring stable operation.

[0055] To ensure safety, if the controller 13 fails to simultaneously detect the signals of the right limit switch 4-8 of cylinder A and the left limit switch 5-7 of cylinder B within the preset working cycle, or fails to simultaneously detect the signals of the left limit switch 4-7 of cylinder A and the right limit switch 5-8 of cylinder B, it will determine that the piston is out of sync or the limit switch is malfunctioning. The controller 13 will immediately generate a system fault signal and execute a safety shutdown procedure to stop the operation of the pump motor 9-3 of the liquid transfer pump 9.

[0056] System cooling and heat dissipation: The coolant first enters the cylinder block B cooling chamber 5-2 through the cylinder block B coolant inlet 5-9, absorbing the waste heat of cylinder block B5; after flowing out, it flows through the coolant line 6 in the radiator 7 for initial cooling; then, it enters the cylinder block A cooling chamber 4-2 through the cylinder block A coolant inlet 4-9, absorbing the waste heat of cylinder block A4; finally, it is discharged from the cylinder block A coolant outlet 4-10, forming a complete series cooling loop; at the same time, the power fluid flows in the power fluid line 8 in the radiator 7 and exchanges heat with the coolant line 6 in the opposite direction. The heat of the two cylinder blocks and the power fluid is managed simultaneously by a single radiator, ensuring the thermal balance of the system.

[0057] Example 2: Figure 4 As shown, this embodiment provides a skid-mounted ultra-long stroke piston-type high gas content mixed pump. The core working principle, component composition and working process of this mixed pump are the same as those of Embodiment 1, and will not be repeated here.

[0058] The unique feature of this embodiment is that the mixed pump system is integrated into a skid mount. Specifically, the mixed pump system is fixed on a skid mount base, which is a rigid frame structure. It has been precisely designed and mechanically analyzed to have sufficient rigidity and strength to withstand the weight of the equipment, operating vibrations, and complex loads during transportation.

[0059] All core components, including cylinder A 4, cylinder B 5, radiator 7, liquid delivery pump 9, energy storage tank 10, two-position four-way cartridge valve 11 and controller 13, are firmly installed on the pry base according to the optimized spatial layout by means of bolt connection, welding and the like, and the corresponding hydraulic lines and electrical lines are also preferably regularly laid and fixed on the base frame.

[0060] The pry design is based on the compact structure and high correlation of the core components in embodiment 1, realizes systematic integration, and brings the following advantages: first, since all components can be integrated and debugged in the factory, the equipment can be quickly put into operation after being transported to the site, greatly shortening the production cycle in scenarios such as marginal oil fields; second, the integrated rigid base not only provides convenience for equipment transportation, but also suppresses and disperses the running vibration through its overall rigidity, improving the long-term stability and reliability of the system; in addition, the centralized layout also facilitates daily maintenance and management.

[0061] Embodiment 3: As shown in Figure 5 When it is necessary to increase the delivery flow, simply increasing the piston reciprocating speed will exacerbate the pulsation of the output flow and pressure. Benefiting from the pry modular flexible design, the present application can increase the number of execution units in parallel to realize flow improvement, thereby avoiding excessively high single piston speed. This embodiment preferably increases two cylinders with the same structure: cylinder C 19 and cylinder D 20, which are connected in parallel with the original cylinder A 4 and cylinder B 5, i.e., cylinder C 19 is connected in parallel with cylinder A 4, and cylinder D 20 is connected in parallel with cylinder B 5. Specifically, the medium suction line (connecting the inlet check valve), the medium discharge line (connecting the outlet check valve), the power fluid line (connecting the switch valve) and the cooling liquid line (cooling liquid outlet and inlet) of them are connected in parallel, and the left and right stroke switches of cylinder C 19 and cylinder D 20 are electrically connected to controller 13.

[0062] The control logic is the same as that of embodiment 1, but the action object is expanded to four cylinders, and the controller 13 is configured to execute the following cycle: The reversing valve 11-1 of the two-position four-way cartridge valve 11 is in the first position, at this time, the power fluid simultaneously enters the cylinder B power cavity 5-4 and the cylinder D power cavity, drives the cylinder B isolation piston 5-3 and the cylinder D isolation piston to move to the direction of the respective transport cavities; at the same time, the power fluid in the cylinder A power cavity 4-4 and the cylinder C power cavity flows back, driving the cylinder A isolation piston 4-3 and the cylinder C isolation piston to move to the direction of the respective power cavities.

[0063] When the cylinder A isolation piston 4-3 and the cylinder C isolation piston both trigger their right stroke switches, and the cylinder B isolation piston 5-3 and the cylinder D isolation piston both trigger their left stroke switches, the controller 13 controls the reversing valve 11-1 to switch to the second station.

[0064] In the second station, the power fluid enters the cylinder A power cavity 4-4 and the cylinder C power cavity at the same time, drives the cylinder A isolation piston 4-3 and the cylinder C isolation piston to move in the direction of the respective transport cavities; at the same time, the power fluid in the cylinder B power cavity 5-4 and the cylinder D power cavity flows back, drives the cylinder B isolation piston 5-3 and the cylinder D isolation piston to move in the direction of the respective power cavities.

[0065] When the cylinder A isolation piston 4-3 and the cylinder C isolation piston both trigger their left stroke switches, and the cylinder B isolation piston 5-3 and the cylinder D isolation piston both trigger their right stroke switches, the controller 13 controls the reversing valve 11-1 to switch back to the first station.

[0066] The embodiment retains all the technical advantages of the embodiments 1 and 2, and through the above-mentioned pry-mounted and modular integrated design, not only solves the engineering problems of the large-scale mixed delivery pump in the aspects of movement, installation and deployment, but also realizes linear expansion of the delivery capacity (as shown by four cylinders in parallel), and does not need to change the core hydraulic and control logic, and the design is particularly suitable for the working conditions needing quick deployment, movement, capacity expansion or limited space, and provides higher engineering practicability, flexibility and economy.

[0067] In summary, the application successfully provides a multiphase flow mixed delivery solution capable of adapting to super-high gas rate, large flow, no pollution and reliable operation through the cooperative design of the super-long stroke piston isolation, the large-flow cartridge valve hydraulic drive, the closed-loop intelligent control and the high-efficiency cooling.

[0068] The above only describes the preferred embodiments of the application and is not used to limit the application, although the application is described in detail with reference to the foregoing embodiments, the skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An ultra-long stroke piston high gas rate mixed conveying pump, comprising a cylinder A (4), a cylinder B (5), a radiator (7), a liquid conveying pump (9), an energy storage tank (10), a two-position four-way cartridge valve (11) and a controller (13), characterized in that: the cylinder A (4) and the cylinder B (5) are respectively provided with a cylinder A isolation piston (4-3) and a cylinder B isolation piston (5-3) with a stroke of not less than 0.8 meters, the cylinder A isolation piston (4-3) seals and isolates the inner cavity of the cylinder A (4) into a cylinder A conveying cavity (4-1) and a cylinder A power cavity (4-4), and the cylinder B isolation piston (5-3) seals and isolates the inner cavity of the cylinder B (5) into a cylinder B conveying cavity (5-1) and a cylinder B power cavity (5-4); the upper part of the circumferential side wall of the cylinder A conveying cavity (4-1) and the cylinder B conveying cavity (5-1) is respectively provided with a cylinder A inlet one-way valve (4-5) and a cylinder B inlet one-way valve (5-5) connected with a multiphase flow inlet (1), and the lower part of the circumferential side wall of the cylinder A conveying cavity (4-1) and the cylinder B conveying cavity (5-1) is respectively provided with a cylinder A outlet one-way valve (4-6) and a cylinder B outlet one-way valve (5-6) connected with a multiphase flow outlet (3); the end of the cylinder A power cavity (4-4) and the cylinder B power cavity (5-4) is respectively provided with a cylinder A on-off valve (4-11) and a cylinder B on-off valve (5-11), and the liquid conveying pump (9) is connected with the cylinder A on-off valve (4-11) and the cylinder B on-off valve (5-11) through the two-position four-way cartridge valve (11); the end of the cylinder A conveying cavity (4-1) and the cylinder B conveying cavity (5-1) is respectively provided with a cylinder A left stroke switch (4-7) and a cylinder B left stroke switch (5-7), and the end of the cylinder A power cavity (4-4) and the cylinder B power cavity (5-4) is respectively provided with a cylinder A right stroke switch (4-8) and a cylinder B right stroke switch (5-8), the cylinder A left stroke switch (4-7), the cylinder B left stroke switch (5-7), the cylinder A right stroke switch (4-8) and the cylinder B right stroke switch (5-8) are electrically connected with the controller (13) through a signal line (12), and the controller (13) is electrically connected with a reversing valve (11-1) of the two-position four-way cartridge valve (11); the controller (13) is configured to control the reversing of the two-position four-way cartridge valve (11) according to the signals of the stroke switches, so that the cylinder A isolation piston (4-3) and the cylinder B isolation piston (5-3) alternately reciprocate linearly. The cylinder A (4) further comprises a cylinder A cooling cavity (4-2) arranged around the cylinder A transport cavity (4-1) and the cylinder A power cavity (4-4), and the cylinder B (5) further comprises a cylinder B cooling cavity (5-2) arranged around the cylinder B transport cavity (5-1) and the cylinder B power cavity (5-4), the cylinder A cooling cavity (4-2) is provided with a cylinder A cooling liquid inlet (4-9) and a cylinder A cooling liquid outlet (4-10), and the cylinder B cooling cavity (5-2) is provided with a cylinder B cooling liquid inlet (5-9) and a cylinder B cooling liquid outlet (5-10); The radiator (7) is provided with a cooling liquid pipeline (6) and a power liquid pipeline (8), the cooling liquid pipeline (6) connects the cylinder A cooling liquid inlet (4-9) and the cylinder B cooling liquid outlet (5-10), and the power liquid pipeline (8) connects the pump outlet (9-2) of the liquid delivery pump (9) and the two-position four-way cartridge valve (11); The outlet of the energy storage tank (10) is provided with a pressure regulating valve (10-1), and the pressure regulating valve (10-1) connects the energy storage tank (10) to the outlet side of the liquid delivery pump (9).

2. A super long stroke, piston type, high gas rate multiphase pump as claimed in claim 1, characterized in that: The two-position four-way cartridge valve (11) is provided with a cartridge valve A port (11-2), a cartridge valve B port (11-4), a cartridge valve P port (11-3) and a cartridge valve T port (11-5); The cylinder A on-off valve (4-11) and the cylinder B on-off valve (5-11) are connected to the cartridge valve A port (11-2) and the cartridge valve B port (11-4) respectively; The pump outlet (9-2) of the liquid delivery pump (9) is connected to the pressure regulating valve (10-1) of the energy storage tank (10) and the cartridge valve P port (11-3) through pipelines respectively, and the pump inlet (9-1) of the liquid delivery pump (9) is connected to the cartridge valve T port (11-5) through the power liquid pipeline (8).

3. A super long stroke, piston type, high gas rate multiphase pump as claimed in claim 1, wherein: The cylinder A isolation piston (4-3) and the cylinder B isolation piston (5-3) are provided with a plurality of mud scraping rings (14), sealing rings (15) and support rings (16) in the axial direction, the mud scraping ring (14) is located close to the transport cavity end, and the inside of the isolation piston is provided with an oil guide hole (18).

4. A super-long-stroke piston high gas fraction multiphase pump according to claim 2, characterized in that: The controller (13) is configured to perform the following control cycle: The reversing valve (11-1) of the two-position four-way cartridge valve (11) is controlled to be in the first position, the power liquid flows from the liquid delivery pump (9) to the cylinder B power cavity (5-4) through the cartridge valve P port (11-3), and drives the cylinder B isolation piston (5-3) to move to the cylinder B transport cavity (5-1) direction, at the same time, the power liquid in the cylinder A power cavity (4-4) flows back to the pump inlet (9-1) of the liquid delivery pump (9) through the cartridge valve A port (11-2), and drives the cylinder A isolation piston (4-3) to move to the cylinder A power cavity (4-4) direction; When the cylinder A isolation piston (4-3) triggers the cylinder A right stroke switch (4-8) and the cylinder B isolation piston (5-3) triggers the cylinder B left stroke switch (5-7), the reversing valve (11-1) of the two-position four-way cartridge valve (11) is switched to the second station; In the second station, the power fluid from the liquid delivery pump (9) enters the cylinder A power cavity (4-4) through the cartridge valve P port (11-3), and drives the cylinder A isolation piston (4-3) to move to the cylinder A transport cavity (4-1) direction, at the same time, the power fluid in the cylinder B power cavity (5-4) returns to the pump inlet (9-1) of the liquid delivery pump (9) through the cartridge valve B port (11-4), and drives the cylinder B isolation piston (5-3) to move to the cylinder B power cavity (5-4) direction; When the cylinder A isolation piston (4-3) triggers the cylinder A left stroke switch (4-7) and the cylinder B isolation piston (5-3) triggers the cylinder B right stroke switch (5-8), the reversing valve (11-1) of the two-position four-way cartridge valve (11) is switched back to the first station.

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