A fluid booster for downhole operations

Abstract

The present invention relates to a downhole fluid booster, comprising a pipe column, an extrusion-driven boosting assembly, a mechanical boosting pump group and a traveling assembly. The pipe column comprises a pipe shell and a fluid channel arranged in the pipe shell. One end of the pipe shell is provided with a high-pressure water inlet interface connected to one end of the fluid channel. The extrusion-driven boosting assembly is assembled between the pipe shell and the fluid channel. Its extrusion portion passes through a hole adapted to the side wall of the pipe shell. The other end of the fluid channel is internally rotatably provided with a main shaft extending toward both ends thereof. The main shaft is provided with spiral blades extending to both ends thereof. The extrusion-driven boosting assembly is connected to the main shaft in a transmission manner. The extrusion-driven boosting assembly is used to convert the extrusion force received by its extrusion portion into mechanical energy for driving the main shaft to rotate. The mechanical boosting pump group is assembled in the pipe shell and connected to a tube cavity at one end of the fluid channel. Advantages: It can achieve the effect of straightening tool strings. Through double boosting, the boosting of downhole operating fluids in deep wells and ultra-deep wells is achieved.

Description

Technical Field

[0001] The invention relates to downhole operation technology of oil and gas wells, and in particular to a downhole operation fluid booster. Background Art

[0002] With the continuous development of deep well and ultra-deep well operation technology, many problems that are difficult to solve with conventional operation technology and methods have been solved. In recent years, the depth of domestic operating wells has become deeper and deeper, the length of horizontal sections has become longer and longer, and the increasing length of horizontal sections and the number of fracturing stages have put forward higher requirements for operation technology and operation tools. For the problem that deep well and ultra-deep well operation technology requires high water injection pressure and conventional water injection technology cannot meet the development needs, the conventional practice is to install an injection pump on the ground and increase the water injection pressure through the ground booster device to achieve normal water injection. However, this method has certain safety hazards. Due to the long-term corrosion of the ground water injection pipeline, unforeseen puncture and leakage accidents may occur. At the same time, the ground injection pressure is limited, which is difficult to meet production needs. The ground pressure is high, and the operation and maintenance are difficult.

[0003] There are two main ways to increase pressure: surface pressure and downhole pressure. The equipment and process used for surface pressure increase are relatively complex and expensive, and the application effect is greatly affected by the depth of the well. Therefore, although the speed-up effect is obvious, it has not been widely used. The main advantage of downhole pressure increase is that there is no need to change the existing process and equipment. By installing a pressure increase device in the tool string, the pressure of part of the liquid can be increased to achieve the purpose of ultra-high pressure jet-assisted rock breaking.

[0004] The patents that have been published so far, such as a Chinese patent, include a housing, a plunger, an energy storage spring, a driving gear mechanism, a hydraulic cylinder, and a drill bit short circuit. Through the flow of fluid, the large gear and small gear of the gear mechanism are driven to rotate, which drives the piston to pressurize the fluid in the hydraulic cylinder, and then opens the sealing valve to achieve the purpose of ejecting the fluid from the high-pressure flow channel. The device compresses the fluid through the hydraulic cylinder and releases it after reaching a certain pressure range, solving the problem of pressurizing the fluid during underground operations. However, the reciprocating motion of the piston can only form intermittent high-pressure fluid. At the same time, due to the harsh underground operating conditions, the energy storage spring and bearings of the internal structure of the device will have a great impact, which is of little significance for deep well operations. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a downhole operation fluid booster, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A downhole fluid booster comprises a pipe column, an extrusion-driven boosting assembly, a mechanical boosting pump group and a traveling assembly, wherein the pipe column comprises a pipe shell and a fluid channel arranged in the pipe shell, one end of the pipe shell is provided with a high-pressure water inlet interface connected to one end of the fluid channel, the extrusion-driven boosting assembly is assembled between the pipe shell and the fluid channel, and its extrusion portion passes through a hole adapted to the side wall of the pipe shell, the other end of the fluid channel is rotatably provided with a main shaft extending toward both ends thereof, the main shaft is provided with spiral blades extending to both ends thereof, the extrusion-driven boosting assembly is transmission-connected to the main shaft, the extrusion-driven boosting assembly is used for converting the extrusion force received by its extrusion portion into mechanical energy for driving the main shaft to rotate, the mechanical boosting pump group is assembled in the pipe shell and connected to a tube cavity at one end of the fluid channel, the mechanical boosting pump group is used for extracting the fluid refluxed from the other end of the pipe shell and injecting it into the fluid channel for pressurization, and the traveling assembly is assembled outside the pipe shell and used for driving the pipe shell to travel along the well wall.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the extrusion drive booster assembly comprises a plurality of first hydraulic cylinder assemblies and a plurality of transmission boxes, wherein the plurality of transmission boxes are spaced around the fluid channel, the transmission box comprises a box body, a crankshaft and a plurality of second hydraulic cylinders, the crankshaft is rotatably mounted in the box body and extends toward the long axis direction of the tube shell, the shaft head of the crankshaft corresponding to the other end of the tube shell passes through the box body and is equipped with a one-way pulley, a plurality of crank connecting rods corresponding to the second hydraulic cylinders are connected to the crankshaft, and the second hydraulic cylinders are each equipped with a second piston, the crank connecting rods respectively extend into the corresponding second hydraulic cylinders and are connected to the second piston, the side wall at the other end of the fluid channel is recessed to form an installation area, the other end of the main shaft extends into the installation area and is equipped with a first driven pulley, the plurality of one-way pulleys are connected by a belt transmission around each of them, and one of the one-way pulleys The pulley is coaxially connected to a transmission shaft, and the transmission shaft is provided with a first active pulley, and the first active pulley is connected to the first passive pulley through a belt transmission surrounding the two, and multiple groups of the first hydraulic cylinder assemblies are assembled in the tube shell and are spaced around the fluid channel, and each group of the first hydraulic cylinder assemblies includes multiple first hydraulic cylinders, and the multiple first hydraulic cylinders in each group are the same in number and correspond one to one to the multiple second hydraulic cylinders in each group, and the cylinder bodies of the first hydraulic cylinders are respectively connected and communicated with the cylinder bodies of the corresponding second hydraulic cylinders through hydraulic pipelines, and a first piston is provided in the first hydraulic cylinder, and the first piston is connected to a first piston rod, and the first piston rods all vertically pass through the adapted through holes on the side wall of the tube shell, and are connected to an extrusion plate, and among the multiple extrusion plates corresponding to the multiple first hydraulic cylinders in the same group, at least one of the extrusion plates is connected to the side wall of the tube shell through an elastic member.

[0010] Furthermore, the mechanical booster pump group includes a booster cylinder, a turbine assembly and a pumping pipeline. The other end of the tube shell is provided with a water inlet and a water suction port. One end of the pumping pipeline is connected and communicated with the water suction port in a one-to-one correspondence, and a first one-way valve is provided at one end of the pumping pipeline. The other end of the pumping pipeline is connected and communicated with one end of the fluid channel, and a second one-way valve is provided at the other end of the pumping pipeline. The cylinder body of the booster cylinder is connected to the middle section of the pumping pipeline through a pipeline. A booster piston is provided in the booster cylinder. The booster piston is connected to a connecting rod. The driving end of the turbine assembly is connected to an eccentric wheel. The connecting rod is movably connected to the eccentric wheel. The turbine assemblies are respectively arranged at positions close to the water inlets. The turbine assemblies are used to convert the kinetic energy of the fluid flowing back into the water inlet into mechanical energy to drive the eccentric wheel to rotate.

[0011] Furthermore, the turbine assembly includes a first turbine having a water inlet and a water outlet, wherein turbine blades are rotatably mounted inside the first turbine, wherein the rotating shaft of the turbine blades is transmission-connected to the rotation center of the eccentric wheel, and the water inlet of the first turbine is close to the water inlet.

[0012] Furthermore, the travel assembly includes a plurality of travel wheel groups, which are arranged around the outer wall of one end of the tube shell at intervals, and the travel wheel groups include a mounting frame, an axle, two wheel bodies, two wheel frames and a second turbine. The two wheel bodies are coaxially mounted on the two ends of the axle, and the two wheel frames are respectively mounted on the two end portions of the axle. The two wheel frames are respectively assembled and connected to one side of the mounting frame through elastic members. The mounting frame is mounted on the outer wall of the tube shell, and the second turbine is assembled on one side of the mounting frame, and its water inlet is connected to the water outlet of the first turbine through a pipeline. The second turbine has turbine blades inside, and the rotating shaft of the turbine blades is connected to a second driving pulley. A second passive pulley is mounted on the axle, and the second driving pulley and the second passive pulley are connected by a belt transmission that surrounds the two.

[0013] Furthermore, the cross section of the fluid channel is circular, and the diameter of one end thereof is larger than that of the other end.

[0014] The beneficial effects of the present invention are as follows: on the one hand, by controlling the gap between the arc plate and the well wall, the effect of straightening the tool string is achieved; on the other hand, through double pressurization, the problem of pressure reduction of the fluid after the friction resistance of the pipe string wall is solved, thereby realizing the pressurization of the downhole operating fluid in deep wells and ultra-deep wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the downhole operation fluid booster of the present invention when used downhole;

[0016] Figure 2 It is a structural elevation view of the downhole operation fluid booster of the present invention;

[0017] Figure 3 It is a structural cross-sectional view of the downhole operation fluid booster of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the downhole fluid booster of the present invention with a portion of the casing removed;

[0019] Figure 5 It is a partial structural schematic diagram of the downhole operation fluid booster of the present invention;

[0020] Figure 6 It is a structural exploded view of the transmission box in the downhole operation fluid booster of the present invention;

[0021] Figure 7 It is a structural exploded view of the mechanical booster pump group in the downhole operation fluid booster of the present invention;

[0022] Figure 8 It is a schematic structural diagram of the traveling wheel set in the downhole operation fluid booster of the present invention.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 11. Tube shell; 12. Fluid channel; 3. Main shaft; 31. First driven pulley; 32. Spiral blade; 41. Box; 42. Crankshaft; 43. Second hydraulic cylinder; 51. First hydraulic cylinder; 61. Boosting cylinder; 62. Turbine assembly; 71. Mounting frame; 72. Axle; 73. Wheel body; 74. Wheel frame; 75. Second turbine; 111. High-pressure water inlet interface; 112. Water inlet; 113. Water inlet; 411. One-way pulley; 412, crank connecting rod; 413, extrusion plate; 431, second piston; 511, first piston; 611, pump-in pipeline; 612, first one-way valve; 613, second one-way valve; 614, boost piston; 615, connecting rod; 621, eccentric wheel; 622, first turbine; 721, second passive pulley; 751, second active pulley; 4111, transmission shaft; 4112, first active pulley. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example: Figure 1 , 2As shown in Figures 3, 4 and 5, the downhole fluid booster of this embodiment includes a pipe string, an extrusion-driven boosting assembly, a mechanical boosting pump group and a traveling assembly. The pipe string includes a pipe shell 11 and a fluid channel 12 arranged in the pipe shell 11. One end of the pipe shell 11 is provided with a high-pressure water inlet interface 111 connected to one end of the fluid channel 12. The extrusion-driven boosting assembly is assembled between the pipe shell 11 and the fluid channel 12, and its extrusion portion passes through the hole position adapted to the side wall of the pipe shell 11. The other end of the fluid channel 12 is rotatably equipped with a main shaft 3 extending toward its two ends. The main shaft 3 is provided with spiral blades 32 extending to its two ends. The extrusion drive booster assembly is transmission-connected to the main shaft 3. The extrusion drive booster assembly is used to convert the extrusion force exerted on its extrusion part into mechanical energy for driving the main shaft 3 to rotate. The mechanical booster pump group is assembled in the tube shell 11 and connected to one end of the tube cavity of the fluid channel 12. The mechanical booster pump group is used to extract the fluid refluxed from the other end of the tube shell 11 and inject it into the fluid channel 12 for pressurization. The walking assembly is assembled on the outside of the tube shell 11 and is used to drive the tube shell 11 to walk along the well wall.

[0027] The underground use process is as follows:

[0028] The device is placed underground (a in the figure indicates the well), and a high-pressure water source is injected from the high-pressure water inlet interface 111 at one end of the tube shell 11 (that is, the upper end placed underground), and the high-pressure water enters the fluid channel 12. Then, when flowing through the spiral blades 32 on the main shaft 3, it will drive the main shaft 3 to rotate, generating a swirl (vortex), thereby pressurizing the fluid (single pressurization). At the same time, the liquid returning upward in the well enters from the lower end of the tube shell 11 and acts on the mechanical booster pump group. The mechanical booster pump group will extract the fluid below the booster into the fluid channel 12 to achieve a pressurization effect (double pressurization). During the whole process, the walking assembly realizes the walking of the device along the well wall. At the same time, if the device is skewed, the extrusion part protruding from the side wall of the tube shell 11 will contact the well wall and squeeze the extrusion part. After the extrusion part is compressed, it will convert the pressure into mechanical energy to drive the main shaft 3 to rotate, thereby achieving the purpose of assisting the main shaft 3 to rotate and increase the pressure.

[0029] Generally, a bottom plate is encapsulated inside the other end of the tube shell 11 , and the fluid channel 12 runs through the middle of the bottom plate. The bottom plate is provided with holes for the fluid to enter the tube shell 11 .

[0030] As a preferred embodiment, Figure 6As shown, the extrusion drive booster assembly includes a plurality of first hydraulic cylinder assemblies and a plurality of transmission boxes, the plurality of transmission boxes are spaced around the fluid channel 12, the transmission box includes a housing 41, a crankshaft 42 and a plurality of second hydraulic cylinders 43, the crankshaft 42 is rotatably mounted in the housing 41 and extends toward the long axis direction of the tube shell 11, the shaft head of the crankshaft 42 corresponding to the other end of the tube shell 11 passes through the housing 41 and is equipped with a one-way pulley 411, and the crankshaft 42 is connected to a plurality of second hydraulic cylinders 43. The crank connecting rod 412 corresponds to the cylinder 43 one by one, and the second piston 431 is installed in each of the above-mentioned second hydraulic cylinders 43. The above-mentioned crank connecting rod 412 extends into the corresponding second hydraulic cylinder 43 and is connected to the above-mentioned second piston 431. The side wall of the other end of the above-mentioned fluid channel 12 is recessed to form an installation area. The other end of the above-mentioned main shaft 3 extends into the above-mentioned installation area and is equipped with a first driven pulley 31. The multiple one-way pulleys 411 are connected by a belt (indicated by p in the figure) around each other. One of the one-way pulleys 411 is coaxially connected A transmission shaft 4111 is connected, and a first driving pulley 4112 is provided on the transmission shaft 4111. The first driving pulley 4112 is connected to the first driven pulley 31 through a belt (indicated by c in the figure) surrounding the two. A plurality of groups of the first hydraulic cylinder assemblies are assembled in the tube shell 11 and surround the fluid channel 12 at intervals. Each group of the first hydraulic cylinder assemblies includes a plurality of first hydraulic cylinders 51. The plurality of first hydraulic cylinders 51 in each group are the same in number and correspond one to one with the plurality of second hydraulic cylinders 43 in each group. The cylinder body of a hydraulic cylinder 51 is connected and communicated with the cylinder body of the corresponding second hydraulic cylinder 43 through a hydraulic pipeline (indicated by d in the figure). The first hydraulic cylinder 51 is provided with a first piston 511, and the first piston 511 is connected to a first piston rod. The first piston rods all vertically pass through the adapted through holes on the side wall of the tube shell 11 and are connected to an extrusion plate 413. Among the multiple extrusion plates 413 corresponding to the multiple first hydraulic cylinders 51 in the same group, at least one extrusion plate 413 is connected to the side wall of the tube shell 11 through an elastic member.

[0031] In the above embodiment, when the casing 11 collides with the well wall during downhole feeding, the extrusion plate 413 will be compressed and contracted, and at the same time, the first piston rod and the first piston 511 will be driven to contract and move in the first hydraulic cylinder 51, so that the hydraulic oil in the first hydraulic cylinder 51 is pressed into the second hydraulic cylinder 43 through the hydraulic pipeline, and the hydraulic oil pressed into the second hydraulic cylinder 43 will act on the second piston 431, so that the second piston 431 drives the crank connecting rod 412 to move linearly, and the movement of the crank connecting rod 412 can drive the crankshaft 42 to rotate. The collision with the well wall in the well may be multi-directional. Therefore, by arranging the extrusion plates 413 from various directions, each transmission box can be operated, thereby driving the respective crankshafts 42 to rotate. During the rotation process, each crankshaft 42 can be linked through the belt connected to the respective one-way pulleys 411, and finally realize the rotation of the transmission shaft 4111. When the transmission shaft 4111 rotates, the first driving pulley 4112 and the first driven pulley 31 are used to assist the main shaft 3 to rotate (in the same direction as the rotation of the main shaft 3), so as to achieve the purpose of assisting the rotation of the main shaft 3 and increasing the pressure.

[0032] It should be noted that the one-way pulley 411 is a prior art, which is similar to the ratchet mechanism of a bicycle rear wheel and prevents interference caused by different rotation speeds of the crankshafts of multiple transmission boxes.

[0033] In this embodiment, the first hydraulic cylinder assembly and the transmission box are respectively provided with four groups, and the corresponding extrusion plates 413 are also provided with four groups, and are distributed around the pipe shell 11. The number of extrusion plates 413 in each group is consistent with the number of multiple first hydraulic cylinders 51 in each group, and one, two or three of the extrusion plates 413 are connected to the pipe shell 11 through an elastic member (spring). The elastic member can shrink and move toward the pipe shell 11 when the extrusion plate 413 and the well wall expand, and cause the extrusion plate 413 to rebound after collision and separation. There is no situation in which the four extrusion plates 413 of each group are exactly in the same plane at the same time, resulting in the inability to obtain the extrusion force. The four extrusion plates 413 will always be in a state where one part is high (stretched) and the other part is low (shrinking close to the pipe shell 11)).

[0034] As a preferred embodiment, Figure 7As shown, the mechanical booster pump group includes a booster cylinder 61, a turbine assembly 62 and a pumping pipeline 611. The other end of the tube shell 11 is provided with a water inlet 112 and a water suction port 113. One end of the pumping pipeline 611 is connected and communicated with the water suction port 113 in a one-to-one correspondence, and one end of the pumping pipeline 611 is provided with a first check valve 612. The other end of the pumping pipeline 611 is connected and communicated with one end of the fluid channel 12, and the other end of the pumping pipeline 611 is provided with a second check valve 613. The booster cylinder 6 The cylinder body of 1 is connected to the middle section of the pump inlet pipeline 611 through a pipeline. A boosting piston 614 is provided in the boosting cylinder 61. The boosting piston 614 is connected to a connecting rod 615. The driving end of the turbine assembly 62 is connected to an eccentric wheel 621. The connecting rod 615 is movably connected to the eccentric wheel 621. The turbine assemblies 62 are respectively arranged at positions close to the water inlet 112. The turbine assemblies 62 are used to convert the kinetic energy of the fluid flowing back into the water inlet 112 into mechanical energy to drive the eccentric wheel 621 to rotate.

[0035] In the above-mentioned implementation scheme, during operation, the fluid below the device flows back through the water inlet 112 and enters the tube shell 11, and then the fluid enters the turbine assembly 62, and is converted into mechanical energy to drive the connecting rod 615 and the booster piston 614 to reciprocate. During the reciprocating motion, there are two actions. First, when the booster piston 614 is pulled outward relative to the booster cylinder 61, the fluid in the tube shell 11 enters the pumping line 611 through the water suction port 113 and the first one-way valve 612; second, when the booster piston 614 is pushed inward relative to the booster cylinder 61, a positive pressure is generated on the pumping line 611. Since the first one-way valve 612 only allows external fluid to enter through the water suction port 113, and the second one-way valve 613 only allows the fluid in the pumping line 611 to flow out through the other end, the pressure will press the fluid entering the pumping line 611 into the fluid channel 12 (the mechanism is similar to a water well), thereby pressurizing the inside of the fluid channel 12.

[0036] As a preferred embodiment, the turbine assembly 62 includes a first turbine 622 having a water inlet and a water outlet, and a turbine blade (indicated by w in the figure) is rotatably installed inside the turbine assembly 62. The rotating shaft of the turbine blade is transmission-connected to the rotation center of the eccentric wheel 621, and the water inlet of the first turbine 622 is close to the water inlet 112.

[0037] In the above implementation scheme, the turbine assembly 62 adopts the fluid turbine device of the prior art. When fluid enters and impacts the turbine blades, the turbine blades will rotate and drive the eccentric wheel 621 to rotate through the rotating shaft, thereby driving the eccentric wheel 621 to drive the connecting rod 615 and the booster piston 614 to reciprocate relative to the booster cylinder 61. The entire design uses the impact force of the fluid backflow to achieve pressurization.

[0038] As a preferred embodiment, Figure 8 As shown, the above-mentioned walking assembly includes a plurality of walking wheel groups (indicated by b in the figure), and the plurality of walking wheel groups are installed around the outer wall of one end of the above-mentioned tube shell 11 in an interval, and the above-mentioned walking wheel groups each include a mounting frame 71, a wheel axle 72, two wheel bodies 73, two wheel frames 74 and a second turbine 75 (whose structure is consistent with the first turbine 622), and the two wheel bodies 73 are coaxially installed at both ends of the above-mentioned wheel axle 72, and the two wheel frames 74 are installed at both ends of the above-mentioned wheel axle 72, respectively, and the two wheel frames 74 are respectively connected to the ends of the above-mentioned wheel axle 72 through elastic members (t in the figure). The water inlet of the second turbine 75 is connected with the water outlet of the first turbine 622 through a pipeline. The second turbine 75 has turbine blades inside. The rotating shaft of the turbine blades is connected with the second driving pulley 751. The wheel shaft 72 is equipped with a second driven pulley 721. The second driving pulley 751 and the second driven pulley 721 are connected by a belt transmission surrounding the two.

[0039] In the above-mentioned implementation scheme, when working underground, the two wheel bodies 73 are tightly attached to the well wall under the elastic force of the elastic member. During the operation of the turbine assembly 62, the fluid entering the first turbine 622 will be sent into the second turbine 75 through the water outlet of the first turbine 622, and then the turbine blades of the second turbine 75 will be driven to rotate, thereby driving the rotating shaft of the turbine blades to rotate, and then driving the second active pulley 751 to be linked with the second passive pulley 721 and the belt to realize the rotation of the wheel body 73. The rotation of the wheel body 73 can drive the device to feed downward along the well wall. The entire travel process is realized by the kinetic energy of the fluid, and the fluid energy is fully utilized to achieve the effect of energy saving and supercharging.

[0040] In this embodiment, the cross section of the fluid channel 12 is circular, and the diameter of one end is larger than that of the other end. The variable diameter connection between one end and the other end of the fluid channel 12 adopts a conical design for smooth transition.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A downhole fluid booster, characterized in that: The invention comprises a pipe column, an extrusion-driven boosting assembly, a mechanical boosting pump group and a travel assembly, wherein the pipe column comprises a pipe shell (11) and a fluid channel (12) arranged in the pipe shell (11), one end of the pipe shell (11) is provided with a high-pressure water inlet interface (111) connected to one end of the fluid channel (12), the extrusion-driven boosting assembly is assembled between the pipe shell (11) and the fluid channel (12), and its extrusion portion passes through a hole adapted to the side wall of the pipe shell (11), and the other end of the fluid channel (12) is rotatably provided with a main shaft (3) extending toward its two ends, and the main shaft (3) is provided with an extending The extrusion drive booster assembly is connected to the main shaft (3) in a transmission manner. The extrusion drive booster assembly is used to convert the extrusion force exerted on the extrusion part into mechanical energy for driving the main shaft (3) to rotate. The mechanical booster pump group is installed in the tube shell (11) and connected to the tube cavity at one end of the fluid channel (12). The mechanical booster pump group is used to extract the fluid refluxed from the other end of the tube shell (11) and inject it into the fluid channel (12) for boosting the pressure. The walking assembly is installed outside the tube shell (11) and is used to drive the tube shell (11) to walk along the well wall.The extrusion drive booster assembly comprises a plurality of first hydraulic cylinder assemblies and a plurality of transmission boxes, wherein the plurality of transmission boxes are spaced around the fluid channel (12), the transmission box comprises a housing (41), a crankshaft (42) and a plurality of second hydraulic cylinders (43), the crankshaft (42) being rotatably mounted in the housing (41) and extending in the direction of the long axis of the tube shell (11), the shaft head of the crankshaft (42) corresponding to the other end of the tube shell (11) passing through the housing (41) and being equipped with a one-way pulley (411), the crankshaft (42) being connected to a plurality of The second hydraulic cylinders (43) are provided with a crank connecting rod (412) corresponding to each other, and the second hydraulic cylinders (43) are provided with a second piston (431). The crank connecting rods (412) extend into the corresponding second hydraulic cylinders (43) and are connected to the second pistons (431). The side wall of the other end of the fluid channel (12) is recessed to form an installation area. The other end of the main shaft (3) extends into the installation area and is provided with a first driven pulley (31). The plurality of one-way pulleys (411) are connected by a belt transmission around each other, and one of the one-way pulleys (41 1) is coaxially connected with a transmission shaft (4111), the transmission shaft (4111) is provided with a first driving pulley (4112), the first driving pulley (4112) and the first driven pulley (31) are connected to each other through a belt transmission surrounding the two, a plurality of groups of the first hydraulic cylinder assemblies are assembled in the tube shell (11) and surround the fluid channel (12) at intervals, each group of the first hydraulic cylinder assemblies includes a plurality of first hydraulic cylinders (51), the plurality of the first hydraulic cylinders (51) in each group and the plurality of the second hydraulic cylinders (43) in each group are the same in number and correspond one to one, The cylinder bodies of the first hydraulic cylinders (51) are connected and communicated with the cylinder bodies of the corresponding second hydraulic cylinders (43) through hydraulic pipelines. A first piston (511) is provided in the first hydraulic cylinder (51). The first piston (511) is connected to a first piston rod. The first piston rods vertically pass through a matching through hole on the side wall of the tube shell (11) and are connected to an extrusion plate (413). Among the multiple extrusion plates (413) corresponding to the multiple first hydraulic cylinders (51) in the same group, at least one extrusion plate (413) is connected to the side wall of the tube shell (11) through an elastic member.The mechanical booster pump assembly comprises a booster cylinder (61), a turbine assembly (62) and a pumping pipeline (611); the other end of the tube shell (11) is provided with a water inlet (112) and a water suction port (113); one end of the pumping pipeline (611) is connected and communicated with the water suction port (113) in a one-to-one correspondence, and one end of the pumping pipeline (611) is provided with a first one-way valve (612); the other end of the pumping pipeline (611) is connected and communicated with one end of the fluid channel (12), and the other end of the pumping pipeline (611) is provided with a second one-way valve (613); the booster cylinder (61 ) is connected to the middle section of the pump inlet pipeline (611) through a pipeline, a boosting piston (614) is provided in the boosting cylinder (61), the boosting piston (614) is connected to a connecting rod (615), the driving end of the turbine assembly (62) is connected to an eccentric wheel (621), the connecting rod (615) is movably connected to the eccentric wheel (621), the turbine assembly (62) is respectively arranged at a position close to the water inlet (112), and the turbine assembly (62) is used to convert the kinetic energy of the fluid flowing back into the water inlet (112) into mechanical energy for driving the eccentric wheel (621) to rotate. ; 2. A downhole fluid booster according to claim 1, characterized in that: The turbine assembly (62) comprises a first turbine (622), the first turbine (622) having a water inlet and a water outlet, a turbine blade being rotatably mounted inside the first turbine (622), the rotating shaft of the turbine blade being transmission-connected to the rotation center of the eccentric wheel (621), and the water inlet of the first turbine (622) being close to the water inlet (112).

3. A downhole fluid booster according to claim 2, characterized in that: The travel assembly comprises a plurality of travel wheel groups, which are installed around the outer wall of one end of the tube shell (11) in an interval manner. The travel wheel groups each comprise a mounting frame (71), a wheel axle (72), two wheel bodies (73), two wheel frames (74) and a second turbine (75). The two wheel bodies (73) are coaxially installed at both ends of the wheel axle (72), the two wheel frames (74) are installed at both ends of the wheel axle (72), and the two wheel frames (74) are installed at one side of the mounting frame (71) through elastic members. The mounting frame (71) is mounted on the outer wall of the tube shell (11), the second turbine (75) is mounted on one side of the mounting frame (71), the water inlet of the second turbine (75) is connected to the water outlet of the first turbine (622) through a pipeline, the second turbine (75) has turbine blades inside, the rotating shaft of the turbine blades is connected to a second driving pulley (751), the wheel shaft (72) is mounted with a second passive pulley (721), and the second driving pulley (751) and the second passive pulley (721) are connected by a belt transmission that surrounds the two.

4. A downhole fluid booster according to claim 1, characterized in that: The cross section of the fluid channel (12) is circular, and the diameter of one end is larger than that of the other end.

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