A kind of oil and gas mixed transmission equipment using two-stage pressurization

Abstract

The present invention relates to an oil-gas mixed transportation equipment using two-stage boosting, comprising: a reciprocating oil-gas mixed transportation pump, having a hydraulic end and a power end, the hydraulic end comprising a pump body and a plunger movably arranged in a plunger running cavity of the pump body, the pump body also having a liquid inlet cavity, the power end comprising a fuselage and a crankshaft arranged in the fuselage, the crankshaft being drivingly connected to the plunger; a rotary booster pump device, having a power input shaft, a liquid suction port for fluid entry, and a liquid outlet for fluid discharge, the power input shaft being connected to the crankshaft of the reciprocating oil-gas mixed transportation pump through a transmission mechanism, thereby sharing the same power source with the reciprocating oil-gas mixed transportation pump, the liquid outlet being connected to the liquid inlet cavity of the reciprocating oil-gas mixed transportation pump. The oil-gas mixed transportation fluid output by the oil-gas mixed transportation equipment has a high output pressure, a large compression ratio, and a large gas content ratio, which can effectively reduce the problem of intermediate station construction in external transmission conditions.

Description

Technical Field

[0001] The invention relates to the technical field of oil-gas mixed transportation pumps, and in particular to an oil-gas mixed transportation device adopting two-stage pressurization. Background Art

[0002] Oil and gas mixed transportation technology is a difficult problem today. At present, the process equipment used in oil and gas field transportation are rotary and reciprocating pumps, which often operate abnormally under different working conditions. Oil and gas mixed transportation pumps, such as single and double screw pumps in conventional conveying screw pumps, generally have a low gas content and a compression ratio of ≤5. Among them, the application of reciprocating oil mixed pumps is relatively stable when the compression ratio is ≤5.

[0003] However, since a considerable number of oil wells and external transmission conditions in the current oil field have low well output pressure and long output distance, this increases the compression ratio of the external oil and gas (the compression ratio is generally between 10-20), and the use of a primary compression process for pump output increases the difficulty. In particular, since the oil and gas fields are located in different geographical environments, the existing working conditions and transmission distance routes are different, the oil and gas ratio and pressure of the oil and gas well output are different, which creates an obstacle to the reliable operation of the equipment. According to the feedback from various oil and gas field sites, in the current oil and gas mixed transmission process, there are still a considerable number of mixed transmission pumps that cannot be externally transmitted when the compression ratio exceeds 10. They can only be transmitted in sections through pipeline laying and intermediate station construction or the external transmission pressure is increased by boosting equipment. This not only increases the investment cost, but also wastes land and pollutes the environment. Therefore, how to provide an oil and gas mixed transmission equipment with high oil and gas mixed transmission output pressure, large compression ratio, and large gas content ratio to meet domestic field applications to solve the problem of less station construction has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an oil-gas mixed transmission equipment with two-stage pressurization in response to the current status of the prior art. The oil-gas mixed transmission fluid has a high output pressure, a large compression ratio, and a large gas content ratio, which can effectively reduce the problem of intermediate station construction under external transmission conditions.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an oil-gas mixed transmission equipment using two-stage pressurization, comprising:

[0006] A reciprocating oil-gas mixed pump, having a hydraulic end and a power end, wherein the hydraulic end comprises a pump body and a plunger movably arranged in a plunger running cavity of the pump body, the pump body also has a liquid inlet cavity, and the power end comprises a body and a crankshaft arranged in the body, the crankshaft is drivingly connected to the plunger;

[0007] The rotary booster pump device comprises a power input shaft, a liquid suction port for fluid entry, and a liquid outlet for fluid discharge. The power input shaft is connected to the crankshaft of the reciprocating oil-gas mixed flow pump through a transmission mechanism, thereby sharing the same power source with the reciprocating oil-gas mixed flow pump. The liquid outlet is connected to the liquid inlet chamber of the reciprocating oil-gas mixed flow pump.

[0008] The rotary booster pump device can be selected as a booster pump such as a positive displacement screw pump or a rotor pump.

[0009] As an improvement, the transmission mechanism is a speed increasing gear transmission pair.

[0010] Specifically, the speed-increasing gear transmission pair can adopt various forms of gear transmission pairs, such as an internal and external meshing gear pair or an external meshing spur gear pair and a bevel gear pair, all of which can achieve the purpose of speed-increasing transmission.

[0011] As an improvement, the speed increasing gear transmission pair includes a driving gear and a driven gear, the driving gear is coaxially connected to the crankshaft, and the driven gear is coaxially connected to the power input shaft of the rotary boost pump device and meshes with the driving gear.

[0012] The driving gear of the speed increasing gear transmission pair can be mounted and fixed on the outer diameter of the end of the crankshaft at the power end and fixed by a keyway. The driven gear is mounted and fixed on the drive shaft of the rotary booster pump device and can also be fixed by a keyway. The speed increasing ratio after the driving gear and the driven gear are meshed can be set according to the specific flow requirements of the oil and gas mixed transmission.

[0013] In order to arrange the rotary booster pump device and the reciprocating oil-gas mixed delivery pump in a reasonable space so as to make the entire oil-gas mixed delivery equipment more compact and reliable, as a preferred embodiment, the fuselage has a bearing seat covering the end position of the crankshaft, the rotary booster pump device is connected to the bearing seat, and its power input shaft extends into the bearing seat, the driving gear is an inner gear ring connected to the end of the crankshaft, and the driven gear is located in the bearing seat and meshes with the inner gear ring.

[0014] As another preferred embodiment, it also includes a lubricating oil pool provided between the rotary booster pump device and the body of the reciprocating oil-gas mixed flow pump, and the speed increasing gear transmission pair is provided in the lubricating oil pool. In this preferred embodiment, the rotary booster pump device is mounted and fixed on the base frame, and is flange-connected to the bearing seat at the end of the crankshaft. The driving gear and the driven gear of the speed increasing gear transmission pair can both be cylindrical gears, and a lubricating oil pool is formed by the oil tank shield. The rotary booster pump uses a low-pressure output pump (compression ratio ≤5) that can transport oil and gas media, which is then input into the reciprocating oil-gas mixed flow pump for two-stage supercharging to achieve a high-pressure oil-gas mixed flow parameter of 6MPa.

[0015] In order to filter the oil-gas mixed fluid before entering the rotary booster pump, effectively remove foreign particles, and thus improve the service life of the oil-gas mixed transmission device, the invention also includes a filter located upstream of the suction port of the rotary booster pump device, the filter includes a shell, a partition member and a filter screen, the partition member is arranged in the inner cavity of the shell, and the inner cavity of the shell is divided into an upstream filter chamber and a downstream gas-liquid mixing chamber in the horizontal direction, the bottom of the partition member has a connecting port for connecting the filter chamber and the gas-liquid mixing chamber, the upper part of the partition member is arranged with a vent for connecting the filter chamber and the gas-liquid mixing chamber, the filter screen is a cylindrical filter screen with an upper opening, and the top wall of the shell has a conical opening with a larger upper part and a smaller lower part corresponding to the filter chamber, and a pressing cover is sealed on the conical opening, the filter screen is connected to the inner wall of the pressing cover by a connecting rod, and together with the pressing cover, it constitutes a liftable filter screen assembly.

[0016] The use of the above-mentioned liftable filter assembly facilitates the direct removal of impurities retained during the filtering process for cleaning. In addition, the setting of the above-mentioned partition member can allow the oil and gas entering the filter chamber to enter the gas-liquid mixing chamber in time through the ventilation of the upper part of the partition member, and the oil and gas entering the filter chamber can enter the gas-liquid mixing chamber through the connecting port at the lower part of the partition member, and then provide the gas pipe and liquid pipe of the gas-liquid mixing device set in the gas-liquid mixing chamber with the corresponding inhaled gas and liquid, so as to achieve the purpose of gas-liquid mixing. The above-mentioned partition member is composed of two partitions spaced apart in the transverse direction to ensure the supporting strength of the partition and avoid deformation caused by fluid impact.

[0017] In order to effectively improve the filtering effect of the oil-gas mixed fluid entering the filter chamber, the filter shell is provided with a filter inlet and a filter outlet, the filter inlet is communicated with the filter chamber, and the filter outlet is communicated with the gas-liquid mixing chamber, and a shelf plate is provided on the inner wall of the shell, which is inclined from top to bottom. The shelf plate is located in the filter chamber and divides the filter chamber into an upper chamber and a lower chamber. A placement opening connecting the upper chamber and the lower chamber is opened in the middle of the shelf plate, and the plane where the upper opening of the cylindrical filter is located is an inclined plane, and is consistent with the inclination direction of the shelf plate. The upper opening of the cylindrical filter has a retaining edge extending outward, and the cylindrical filter is placed on the peripheral edge of the installation opening of the shelf plate through the retaining edge, and penetrates into the lower chamber of the filter chamber. After the cylindrical filter is placed in place, the upper opening of the cylindrical filter corresponds to the filter inlet.

[0018] In order to facilitate the disassembly and assembly of the cylindrical filter and ensure the reliability of the fixation of the cylindrical filter, the clamping cover is connected to the top wall of the shell by a push rod bolt, and when the clamping cover is tightened in place, the retaining edge of the cylindrical filter is correspondingly pressed and sealed on the peripheral edge of the mounting port of the partition.

[0019] As improvements, it also includes:

[0020] A reflux regulating pipeline assembly comprises a reflux pipeline for returning excess fluid to the filter, wherein the reflux pipeline is connected to the liquid outlet of the rotary booster pump device and the filter, and a first valve for controlling the flow rate is provided on the reflux pipeline; the reflux regulating pipeline assembly can be used to return part of the oil-gas mixed fluid to the filter, thereby adjusting the pressure and flow rate of part of the oil-gas mixed fluid before entering the liquid inlet chamber of the reciprocating oil-gas mixed pump.

[0021] The online cleaning pipeline assembly includes a bypass pipeline arranged in parallel with the filter and a second valve arranged on the bypass pipeline, the first port of the bypass pipeline is connected to the filter outlet of the filter through a three-way control valve, the second port of the bypass pipeline is connected to the liquid inlet pipe corresponding to the filter inlet of the filter, and the liquid inlet pipe is also provided with a third valve. The third valve is located downstream of the connection position between the bypass pipeline and the liquid inlet pipe. The above-mentioned online cleaning pipeline assembly can be used for online cleaning of debris in the filter and controlling the reflux volume.

[0022] As an improvement, it also includes a gas-liquid mixing device, which includes a gas-liquid mixing pipe, an air pipe and a liquid pipe. The gas-liquid mixing pipe is arranged on the filter outlet of the shell, and has a first end extending into the gas-liquid mixing chamber of the filter and a second end exposed outside the filter. The second end of the gas-liquid mixing pipe is connected to the suction port of the rotary booster pump device, and the air pipe and the liquid pipe are both connected to the first end of the gas-liquid mixing pipe and communicate with the gas-liquid mixing pipe. The gas-liquid mixing pipe is basically arranged horizontally, the air pipe is extended upward, and the liquid pipe is extended downward. The gas-liquid mixing pipe can rotate around its own axis, so as to adjust the inlet of the air pipe and the inlet of the liquid pipe to different height positions.

[0023] When the oil-gas mixed fluid enters the filter (gas-liquid mixing chamber), the delivery position (height position) of the gas pipe (inlet) and the liquid pipe (inlet) can be adjusted and set by rotating the gas-liquid mixing pipe of the above-mentioned gas-liquid mixing device to achieve the purpose of mixing and realize the normal external transmission of oil and gas.

[0024] Compared with the prior art, the advantages of the present invention are as follows: when transporting oil and gas mixed fluid, the mixed gas and liquid at the wellhead can be sucked in by the vacuum of the rotary booster pump device, and then pressurized once ((increasing the compression ratio ≤5)) by the rotary booster pump device (rotational volume change of the screw pump or the rotor pump), and then transmitted to the liquid inlet chamber of the reciprocating oil and gas mixed pump. Under the reciprocating action of the plunger of the reciprocating oil and gas mixed pump, secondary pressurization can be performed on the basis of the pressure provided by the rotary booster pump device (increasing the compression ratio ≤10), so that the input pressure of the oil and gas mixed fluid can reach 5-6MPa, effectively meeting the on-site transportation conditions of the oil and gas field, and realizing a one-pump-to-the-bottom process to eliminate intermediate station construction and the like. On the other hand, the power of the rotary booster pump device is provided by the power end of the reciprocating oil-gas mixed pump, that is, the rotary booster pump device and the reciprocating oil-gas mixed pump share the same power source, so there is no need to be equipped with a motor or other power source, which saves costs and also reduces the overall size of the oil-gas mixed transportation equipment using two-stage boosting, reducing the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the oil and gas mixed transportation equipment according to an embodiment of the present invention;

[0026] Figure 2 A top view of an oil and gas mixed transportation device according to an embodiment of the present invention;

[0027] Figure 3 It is a left side view of the oil and gas mixed transportation equipment according to an embodiment of the present invention;

[0028] Figure 4 A top view of a filter according to an embodiment of the present invention;

[0029] Figure 5 for Figure 4 Sectional view at AA in the middle;

[0030] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0031] Figure 7 It is a structural schematic diagram of the connection between the reciprocating oil-gas mixed pump and the rotary booster pump device according to an embodiment of the present invention (the driving gear adopts a cylindrical gear);

[0032] Figure 8 It is a structural schematic diagram of the connection between a reciprocating oil-gas mixed pump and a rotary booster pump device according to an embodiment of the present invention (the driving gear adopts an internal gear ring). DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] See also Figure 1-Figure 8 A two-stage pressurized oil and gas mixed transmission equipment includes a common base 90, a reciprocating oil and gas mixed transmission pump 10, a rotary booster pump device 20, a transmission mechanism 30, a filter 40, a reflux regulating pipeline assembly and an online cleaning pipeline assembly. The reciprocating oil and gas mixed transmission pump 10, the rotary booster pump device 20 and the filter 40 are all placed on the common base 90.

[0036] The reciprocating oil-gas mixed flow pump 10 has a hydraulic end and a power end. The hydraulic end includes a pump body 11 and a plunger 110 movably arranged in the plunger running chamber of the pump body 11, and the plunger running chamber has a packing seal assembly. The pump body 11 also has a liquid inlet chamber (not shown) and a liquid discharge chamber (not shown), the liquid inlet chamber is connected to the liquid inlet pipe 83, and the liquid discharge chamber is connected to the liquid discharge pipeline 15. The power end includes a fuselage 12 and a crankshaft 13 arranged in the fuselage 12, and the crankshaft 13 is driven and connected to the plunger 110 through a transmission structure such as a connecting rod and a crosshead. The matching structure and corresponding action process of the power end and the hydraulic end of the reciprocating oil-gas mixed flow pump 10 are all prior art and will not be repeated here.

[0037] The rotary booster pump device 20 has a power input shaft 21, a liquid suction port 22 for fluid to enter, and a liquid outlet 23 for fluid to be discharged. The liquid suction port 22 is connected to the filter 40, and the liquid outlet 23 is connected to the liquid inlet chamber of the reciprocating oil-gas mixed pump 10 through an external pipeline. In this embodiment, the power input shaft 21 of the rotary booster pump device 20 is connected to the crankshaft 13 of the reciprocating oil-gas mixed pump 10 through a transmission mechanism 30, that is, the rotary booster pump device 20 in this embodiment does not need to be equipped with a motor or other power source, but shares the same power source with the reciprocating oil-gas mixed pump 10. The rotary booster pump device 20 of this embodiment can be selected as a booster pump such as a positive displacement screw pump or a rotor pump (omitting a driving source such as a motor).

[0038] In this embodiment, the transmission mechanism 30 for transmitting power between the power input shaft 21 of the rotary boost pump device 20 and the crankshaft 13 of the reciprocating oil-gas mixed pump 10 adopts a speed-increasing gear transmission pair to meet the speed requirement of the rotary boost pump device 20 and achieve the purpose of initial supercharging of the oil-gas mixed fluid. The above-mentioned speed-increasing gear transmission pair can adopt various forms of gear transmission pairs, such as internal and external meshing gear pairs or external meshing spur gear pairs and bevel gear pairs can achieve the purpose of speed-increasing transmission. Specifically, the speed-increasing gear transmission pair in this embodiment includes a driving gear 31 and a driven gear 32, the driving gear 31 is coaxially connected to the crankshaft 13, and the driven gear 32 is coaxially connected to the power input shaft 21 of the rotary boost pump device 20, and meshes with the driving gear 31. Among them, the driving gear 31 of the speed-increasing gear transmission pair can be installed and fixed on the outer diameter of the end of the crankshaft 13 at the power end (with a step), and fixed by keyways and bolts. The driven gear 32 is mounted and fixed on the driving shaft of the rotary booster pump device 20, and can also be fixed by a keyway. The speed increase ratio after the driving gear 31 and the driven gear 32 are meshed can be set according to the specific flow demand of the oil and gas mixed transmission.

[0039] See also Figure 8 As a preferred embodiment, the fuselage 12 has a bearing seat 14 which is covered at the end position of the crankshaft 13, and the rotary boost pump device 20 is connected to the bearing seat 14. After being connected in place, the power input shaft 21 of the rotary boost pump device 20 extends into the bearing seat 14, and the driven gear 32 is connected to the end of the power output shaft and is located in the bearing seat 14. The driving gear 31 is an inner gear ring connected to the end of the crankshaft 13, and the above-mentioned driven gear 32 meshes with the inner gear ring to achieve speed-increasing transmission. By reasonably arranging the transmission structure and other components between the rotary boost pump device 20 and the reciprocating oil-gas mixed transmission pump 10 in a reasonable space, the entire oil-gas mixed transmission equipment can be made more compact and reliable.

[0040] See also Figure 7 As another preferred embodiment, the rotary booster pump device 20 is fixed on the base frame and flange-connected to the bearing seat 14 at the end of the crankshaft 13 of the fuselage 12, wherein the driving gear 31 and the driven gear 32 of the speed-increasing gear transmission pair can both be cylindrical gears. The speed-increasing gear transmission pair is provided in a lubricating oil pool 33 formed by the oil tank shield 34.

[0041] The rotary booster pump of this embodiment adopts a low-pressure output pump (compression ratio ≤ 5) that can transport oil and gas media. After rotary boosting, it is input into the reciprocating oil and gas mixed pump 10 for two-stage boosting to achieve a high-pressure oil and gas mixed transmission parameter of 6MPa.

[0042] See also Figure 1-Figure 3The filter 40 is located upstream of the liquid suction port 22 of the rotary booster pump device 20 and is used to filter the oil-gas mixed fluid entering the rotary booster pump device 20 to effectively remove foreign particles, thereby increasing the service life of the oil-gas mixed transmission device.

[0043] Combination Figure 4-Figure 6 The filter 40 includes a housing 41, a partition 414, a filter screen 42, and a gas-liquid mixing device 80. The housing 41 of the filter 40 of this embodiment has a waist-shaped cross section. The housing 41 of the filter 40 is provided with a filter inlet 53 and a filter outlet 54, the filter inlet 53 is communicated with the filter chamber 51, and the filter outlet 54 is communicated with the gas-liquid mixing chamber 52.

[0044] See also Figure 5 , the partition member 414 is arranged in the inner cavity of the housing 41, and the inner cavity of the housing 41 is divided into a filter cavity 51 located upstream and a gas-liquid mixing cavity 52 located downstream in the horizontal direction. The filter screen 42 is arranged in the filter cavity 51, and the gas-liquid mixing device 80 is arranged in the gas-liquid mixing cavity 52. ​​The volume size of the two (filter cavity 51 and gas-liquid mixing cavity 52) can be set according to the gas-liquid ratio of transmission. The bottom of the partition member 414 has a connecting port 4140 for connecting the filter cavity 51 and the gas-liquid mixing cavity 52, which can pass through the bottom with the liquid. The upper part of the partition member 414 is arranged with a vent hole 4141 for connecting the filter cavity 51 and the gas-liquid mixing cavity 52, which can allow gas to pass through from the upper part. Therefore, the separated gas and liquid entering the filter cavity 51 can enter the gas-liquid mixing cavity 52 in time, and the gas-liquid mixing device 80 correspondingly arranged in the gas-liquid mixing cavity 52 transports the oil-gas mixed fluid to the outside of the filter 40.

[0045] See also Figure 5 The partition member 414 is composed of two partitions spaced apart in the transverse direction to ensure the supporting strength of the partition member 414 and avoid deformation caused by fluid impact.

[0046] See also Figure 6The filter screen 42 of this embodiment is a cylindrical filter screen (basket filter screen) with an upper opening 422. The top wall of the housing 41 has a tapered opening 410 that is larger at the top and smaller at the bottom, corresponding to the filter chamber 51. The tapered opening 410 is sealed with a pressing cover 412, and the outer peripheral surface of the pressing cover 412 is also tapered to match the above-mentioned tapered opening 410. The filter screen 42 is connected to the inner wall of the pressing cover 412 through a connecting rod 43, and together with the pressing cover 412, it forms a portable filter screen assembly. Specifically, a lever-type handle valve can be arranged on the top wall plane of the shell 41, and the above-mentioned clamping cover 412 serves as the valve core, and the conical opening 410 serves as the valve port. By adjusting the push rod bolt 413, the outer peripheral surface of the clamping cover 412 and the inner wall surface of the conical opening 410 are pressed and fitted to form a mutually matching sealing surface (conical valve surface), and an O-ring 415 is placed on the conical valve surface for further sealing.

[0047] The above-mentioned movable filter assembly can be directly lifted out, which facilitates the cleaning of impurities retained in the filter 42 during the filtering process. The above-mentioned partition member 414 is set so that the oil and gas entering the filter chamber 51 can enter the gas-liquid mixing chamber 52 in time through the ventilation of the upper part of the partition member 414, and the oil and gas entering the filter chamber 51 can enter the gas-liquid mixing chamber 52 through the connecting port 4140 at the lower part of the partition member 414, and then the gas pipe 82 and the liquid pipe 83 of the gas-liquid mixing device 80 set in the gas-liquid mixing chamber 52 can be used to inhale gas and liquid accordingly, so as to achieve the purpose of gas-liquid mixing.

[0048] See also Figure 6 A shelf plate 55 is provided on the inner wall of the housing 41 and is tilted downward from top to bottom. The shelf plate 55 is located in the filter chamber 51 and divides the filter chamber 51 into an upper chamber 511 and a lower chamber 512. One side of the shelf plate 55 is also connected to the partition member 414 to ensure the support strength of the partition member 414. The filter screen 42 is placed on the shelf plate 55.

[0049] See also Figure 6, a placement opening 551 connecting the upper chamber 511 and the lower chamber 512 is provided in the middle of the shelf plate 55, and the placement opening 551 is elliptical (because the shelf plate 55 is inclined). The plane where the upper opening 422 of the cylindrical filter screen of this embodiment is located is an inclined plane, and is consistent with the inclination direction of the shelf plate 55. The upper opening 422 of the cylindrical filter screen has a retaining edge 421 extending outward, and the extension direction of the retaining edge 421 is also consistent with the inclination direction of the shelf plate 55. Therefore, the cylindrical filter screen can be placed on the peripheral edge of the installation opening of the shelf plate 55 through the retaining edge 421, and penetrate into the lower chamber 512 of the filter cavity 51. After the cylindrical filter screen is placed in place, the upper opening 422 of the cylindrical filter screen corresponds to the filter inlet 53 facing inward. This structural design increases the filtering area and allows the oil-gas mixed fluid to directly enter the interior of the filter screen 42, effectively improving the filtering effect.

[0050] See also Figure 6 On the other hand, the clamping cover 412 of the present embodiment is connected to the top wall of the housing 41 by means of a push rod bolt 413, and when the clamping cover 412 is clamped in place, the retaining edge 421 of the cylindrical filter screen is correspondingly clamped and sealed on the peripheral edge of the mounting opening of the partition, which facilitates the disassembly and assembly of the cylindrical filter screen and ensures the reliability of the fixing of the cylindrical filter screen.

[0051] See also Figure 5 The gas-liquid mixing device 80 includes a gas-liquid mixing pipe 81, an air pipe 82 and a liquid pipe 83. The gas-liquid mixing pipe 81 is arranged on the filter outlet 54 of the housing 41, and has a first end extending into the gas-liquid mixing chamber 52 of the filter 40 and a second end exposed outside the filter 40. The second end of the gas-liquid mixing pipe 81 is connected to the liquid suction port 22 of the rotary booster pump device 20. The air pipe 82 and the liquid pipe 83 are both connected to the first end of the gas-liquid mixing pipe 81 and communicate with the gas-liquid mixing pipe 81. The gas-liquid mixing pipe 81 is basically arranged horizontally, the air pipe 82 is extended upward, and the liquid pipe 83 is extended downward. The gas-liquid mixing pipe 81 can rotate around its own axis, so that the inlet of the air pipe 82 and the inlet of the liquid pipe 83 can be adjusted to different height positions.

[0052] When the oil-gas mixed fluid enters the filter 40 (in the gas-liquid mixing chamber 52), the delivery position (height position) of the air pipe 82 (inlet) and the liquid pipe 83 (inlet) can be adjusted by rotating the gas-liquid mixing pipe 81 of the above-mentioned gas-liquid mixer 80 to achieve the purpose of mixing and realize the normal external transmission of oil and gas.

[0053] See also Figure 2, a reflux regulating pipeline assembly includes a reflux pipeline 61 for returning excess fluid to the filter 40. The reflux pipeline 61 is connected to the liquid outlet 23 of the rotary booster pump device 20 and the filter 40, and a first valve 62 for controlling the flow rate is provided on the reflux pipeline 61. A fourth valve 63 is provided at the liquid outlet 23 of the rotary booster pump device to control the discharge volume and pressure of the output fluid of the rotary booster pump device. The above-mentioned reflux regulating pipeline assembly can be used to return part of the oil-gas mixed fluid to the filter 40, so as to adjust the pressure and flow rate of part of the oil-gas mixed fluid before entering the liquid inlet chamber of the reciprocating oil-gas mixed pump 10.

[0054] Continue to see Figure 2 The online cleaning pipeline assembly includes a bypass pipeline 71 arranged in parallel with the filter 40 and a second valve 72 arranged on the bypass pipeline 71. The first port of the bypass pipeline 71 is connected to the filter outlet 54 of the filter 40 through a three-way control valve 73. The second port of the bypass pipeline 71 is connected to a liquid inlet pipe 74 corresponding to the filter inlet 53 of the filter 40. The liquid inlet pipe 74 is also provided with a third valve 75. The third valve 75 is located downstream of the connection position between the bypass pipeline 71 and the liquid inlet pipe 74. The above-mentioned online cleaning pipeline assembly can clean the debris of the filter 40 online and control the reflux amount without stopping the machine.

[0055] When the oil-gas mixed fluid is transported, the mixed gas and liquid at the wellhead can be sucked in by the vacuum of the rotary booster pump device 20, and then pressurized once ((increased compression ratio ≤ 5)) by the rotary booster pump device 20 (rotational volume change of the screw pump or the rotor pump), and then transmitted to the liquid inlet chamber of the reciprocating oil-gas mixed transport pump 10. Under the reciprocating action of the plunger 110 of the reciprocating oil-gas mixed transport pump 10, secondary pressurization (increased compression ratio ≤ 10) can be performed on the basis of the pressure provided by the rotary booster pump device 20, so that the input pressure of the oil-gas mixed fluid can reach 5-6MPa, effectively meeting the on-site transportation conditions of the oil and gas field, and realizing a one-pump-to-the-end process to eliminate intermediate station construction and other process flows. On the other hand, the power of the rotary booster pump device 20 is provided by the power end of the reciprocating oil-gas mixed pump 10, that is, the rotary booster pump device 20 and the reciprocating oil-gas mixed pump 10 share the same power source, so there is no need to be equipped with a motor or other power source, which saves costs and also reduces the overall volume of the oil-gas mixed transportation equipment using two-stage boosting, reducing the occupied space.

Claims

1. An oil-gas mixed transmission equipment using two-stage pressurization, comprising: A reciprocating oil-gas mixed pump (10) has a hydraulic end and a power end, the hydraulic end comprising a pump body (11) and a plunger (110) movably arranged in a plunger operation chamber of the pump body (11), the pump body (11) also having a liquid inlet chamber, the power end comprising a body (12) and a crankshaft (13) arranged in the body (12), the crankshaft (13) being drivingly connected to the plunger (110); The invention is characterized in that it also includes: The rotary booster pump device (20) comprises a power input shaft (21), a liquid suction port (22) for fluid to enter, and a liquid outlet (23) for fluid to be discharged. The power input shaft (21) is connected to the crankshaft (13) of the reciprocating oil-gas mixed pump (10) through a transmission mechanism (30), thereby sharing the same power source with the reciprocating oil-gas mixed pump (10), and the liquid outlet (23) is communicated with the liquid inlet chamber of the reciprocating oil-gas mixed pump (10); The invention also comprises a filter (40) located upstream of the liquid suction port (22) of the rotary booster pump device (20), the filter (40) comprising a shell (41), a partition member (414) and a filter screen (42), the partition member (414) being arranged in the inner cavity of the shell (41) and dividing the inner cavity of the shell (41) into a filter cavity (51) located upstream and a gas-liquid mixing cavity (52) located downstream in the transverse direction, the bottom of the partition member (414) having a connecting port (4140) for connecting the filter cavity (51) and the gas-liquid mixing cavity (52), the partition member (414) having a connecting port (4140) for connecting the filter cavity (51) and the gas-liquid mixing cavity (52), The upper part of the component (414) is provided with a vent hole (4141) for connecting the filter chamber (51) and the gas-liquid mixing chamber (52); the filter screen (42) is a cylindrical filter screen with an upper opening (422); the top wall of the shell (41) has a conical opening (410) corresponding to the filter chamber (51), which is larger at the top and smaller at the bottom; a pressing cover (412) is sealed on the conical opening (410); the filter screen (42) is connected to the inner wall of the pressing cover (412) through a connecting rod (43), and together with the pressing cover (412) constitutes a liftable filter screen assembly.

2. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 1 is characterized in that: The transmission mechanism (30) is a speed-increasing gear transmission pair.

3. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 2 is characterized in that: The speed increasing gear transmission pair comprises a driving gear (31) and a driven gear (32), wherein the driving gear (31) is coaxially connected to the crankshaft (13), and the driven gear (32) is coaxially connected to the power input shaft (21) of the rotary boost pump device (20) and meshes with the driving gear (31).

4. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 3 is characterized in that: The body (12) is provided with a bearing seat (14) which is arranged to cover the end position of the crankshaft (13); the rotary boost pump device (20) is connected to the bearing seat (14) and its power input shaft (21) extends into the bearing seat (14); the driving gear (31) is an inner gear ring connected to the end of the crankshaft (13); and the driven gear (32) is located in the bearing seat (14) and meshes with the inner gear ring.

5. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 3 is characterized in that: It also includes a lubricating oil pool (33) disposed between the rotary booster pump device (20) and the body (12) of the reciprocating oil-gas mixed pump (10), and the speed increasing gear transmission pair is disposed in the lubricating oil pool (33).

6. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 1 is characterized in that: The housing (41) of the filter (40) is provided with a filter inlet (53) and a filter outlet (54); the filter inlet (53) is in communication with the filter chamber (51); the filter outlet (54) is in communication with the gas-liquid mixing chamber (52); a shelf plate (55) is provided on the inner wall of the housing (41) and is arranged obliquely from top to bottom; the shelf plate (55) is located in the filter chamber (51) and divides the filter chamber (51) into an upper chamber (511) and a lower chamber (512); a middle portion of the shelf plate (55) is provided with a connection between the upper chamber (511) and the lower chamber (512); The mounting opening (551) of the chamber (512) is such that the plane where the upper opening (422) of the cylindrical filter is located is an inclined plane and is consistent with the inclination direction of the shelf plate (55). The upper opening (422) of the cylindrical filter has an outwardly extending retaining edge (421). The cylindrical filter is placed on the peripheral edge of the mounting opening of the shelf plate (55) through the retaining edge (421) and penetrates into the lower chamber (512) of the filter cavity (51). After the cylindrical filter is placed in place, the upper opening (422) of the cylindrical filter corresponds to the filter inlet (53).

7. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 6 is characterized in that: The clamping cover (412) is connected to the top wall of the shell (41) via a push rod bolt (413), and when the clamping cover (412) is clamped in place, the retaining edge (421) of the cylindrical filter screen is correspondingly clamped and sealed on the peripheral edge of the mounting opening of the partition.

8. The oil-gas mixed transmission equipment using two-stage pressurization according to claim 1 is characterized in that Also includes: a reflux regulating pipeline assembly, comprising a reflux pipeline (61) for returning excess fluid to the filter (40), the reflux pipeline (61) being in communication with a liquid outlet (23) of the rotary booster pump device (20) and the filter (40), and a first valve (62) for controlling flow rate being provided on the reflux pipeline (61); An online cleaning pipeline assembly comprises a bypass pipeline (71) and a second valve (72) arranged on the bypass pipeline (71); a first port of the bypass pipeline (71) is connected to a filter outlet (54) of the filter (40) via a three-way control valve (73); a second port of the bypass pipeline (71) is connected to a liquid inlet pipe (74) corresponding to a filter inlet (53) of the filter (40); and a third valve (75) is also arranged on the liquid inlet pipe (74).

9. The oil-gas mixed transportation equipment using two-stage pressurization according to claim 1 is characterized in that: The invention also comprises a gas-liquid mixing device (80), the gas-liquid mixing device (80) comprising a gas-liquid mixing tube (81), an air tube (82) and a liquid tube (83), the gas-liquid mixing tube (81) being arranged on the filter outlet (54) of the housing (41) and having a first end extending into the gas-liquid mixing chamber (52) of the filter (40) and a second end exposed outside the filter (40), the second end of the gas-liquid mixing tube (81) being connected to the liquid suction port of the rotary booster pump device (20) The gas-liquid mixed delivery pipe (81) is connected to the inlet (22), the gas pipe (82) and the liquid pipe (83) are both connected to the first end of the gas-liquid mixed delivery pipe (81) and are in communication with the gas-liquid mixed delivery pipe (81), the gas-liquid mixed delivery pipe (81) is basically arranged horizontally, the gas pipe (82) is extended upward, and the liquid pipe (83) is extended downward, and the gas-liquid mixed delivery pipe (81) can rotate around its own axis, so that the inlet of the gas pipe (82) and the inlet of the liquid pipe (83) can be adjusted to different height positions.

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