A deployable, retrieval-type downhole small-diameter, large-displacement hydraulic pulse booster device

Abstract

This invention discloses a deployable, small-diameter, high-volume hydraulic pulse booster device for downhole applications, comprising a retrieval head, an upper cylinder, an upper water outlet section with a high-pressure output channel, a booster section, a lower water outlet section with a low-pressure output channel, and a lower cylinder. The booster section includes a booster section and a hydraulic automatic directional control valve. The booster section includes an upper high-pressure piston, a low-pressure piston, and a lower high-pressure piston. An upper high-pressure chamber is formed above the upper high-pressure piston; an upper low-pressure chamber and a lower low-pressure chamber are formed above and below the low-pressure piston; a lower high-pressure chamber is formed below the lower high-pressure piston. The first port of the main valve body of the hydraulic automatic directional control valve is connected to the upper low-pressure chamber, the second port is connected to the lower low-pressure chamber, the high-pressure port is connected to an outer high-pressure oil channel, and both the upper and lower return ports are connected to return oil channels. The booster section has an inlet channel, a return channel, a first control channel, and a second control channel. This invention meets the requirements of small diameter and high displacement, and can ensure stratified water injection effect without changing existing equipment.

Description

Technical Field

[0001] This invention belongs to the technical field of downhole water injection in offshore oil fields, and more specifically, it relates to a drop-and-retrieve downhole small-diameter large-displacement hydraulic pulse booster device. Background Technology

[0002] Water injection is a common development method used in oilfields both domestically and internationally. Water injection replenishes reservoir energy and maintains reservoir pressure; under favorable geological and physical conditions, oil recovery rates can reach 60%–65% or higher. Currently, understanding of water injection in oilfields is largely limited to the pressure-stabilized water injection method. This involves a surface high-pressure pump injecting continuous, steady-state high-pressure water into the formation through injection pipelines. The high-pressure water is converted from pressure head to velocity head by a distributor and then injected into the formation through existing formation fissures and channels. This method has three major problems: ① In low-permeability formations, substandard water quality can cause near-wellbore contamination and blockage, reducing formation permeability, leading to increased injection pressure and decreased injection volume; ② In heavy oil reservoirs, the large difference in viscosity between water and oil can easily cause large-scale viscous fingering and coneing; ③ When the reservoir is severely heterogeneous or has high-permeability channels, the sweep effect of the injected water will be very low.

[0003] Currently, the surface water injection system in oilfields uses high-pressure injection pumps to increase the pressure of the injected water to the required level before distributing it to various injection wells for injection into the oil reservoir. However, with the continuous development of the oilfield, due to differences in reservoir characteristics, geological structures, and development history, the injection pressure in some wells has increased. This has resulted in many injection well trunk line pressures failing to meet the injection requirements, hindering the completion of the required injection volume and impacting the smooth implementation of the overall oilfield development plan. The main technical problems with surface pressurized water injection include: increased injection pressure in individual wells; mismatched surface water injection systems (injection pipelines and wellheads); numerous safety hazards associated with maintaining high-pressure water injection on the surface; and a large workload for surface pump maintenance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and propose a drop-and-retrieve downhole small-diameter large-displacement hydraulic pulse booster device to meet the requirements of small diameter and large displacement. It can ensure the effect of stratified water injection without moving the existing surface equipment and process tubing, and has important social benefits and promotion and application value for oilfield development and production, and increased and stable production.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] This invention relates to a deployable, small-diameter, large-capacity downhole hydraulic pulse booster device, comprising, from top to bottom, a retrieval head, an upper cylinder, an upper water outlet section, a booster section, a lower water outlet section, and a lower cylinder. An injection safety valve is located at the top of the upper water outlet section and is situated inside the upper cylinder. A radial high-pressure output channel is provided on the side wall of the upper water outlet section, and a radial low-pressure output channel is provided on the side wall of the lower water outlet section.

[0007] A piston sleeve is provided in the upper part of the pressurizing short section. The pressurizing short section is provided with a pressurizing part and a hydraulic automatic reversing control valve. The pressurizing part is coaxially arranged with the piston sleeve and is located at the lower end of the piston sleeve. The hydraulic automatic reversing control valve is embedded from the lower surface of the pressurizing short section upward and is axially fixed by a sealing plug.

[0008] The pressurization section includes an upper high-pressure piston, a low-pressure piston, and a lower high-pressure piston connected sequentially from the upper right to the lower left. The upper end of the upper high-pressure piston extends into the piston sleeve, forming an upper high-pressure chamber above it. The low-pressure piston is located in the cavity between the lower surface of the piston sleeve and the inner wall of the pressurization stub, forming an upper low-pressure chamber above and a lower low-pressure chamber above it. The lower end of the lower high-pressure piston extends downward along the inner wall of the pressurization stub, forming a lower high-pressure chamber below it. The upper high-pressure chamber is connected to the high-pressure output port channel through an upper liquid outlet check valve via the inner cavity of the upper water outlet stub, and is also connected to the outer high-pressure oil channel through an upper liquid inlet check valve. The lower high-pressure chamber is connected to the high-pressure output port channel through a lower liquid outlet check valve via the axial channel of the side wall of the pressurization stub and the inner cavity of the upper water outlet stub, and is also connected to the outer high-pressure oil channel through a lower liquid inlet check valve.

[0009] The hydraulic automatic directional control valve includes a main valve body and a control valve core. The control valve core is located inside the main valve body, and its upper and lower parts form an upper chamber and a lower chamber, respectively. The main valve body sidewall has, from top to bottom, a radial oil inlet, an upper return oil port, a first oil port, a high-pressure oil port, a second oil port, a lower return oil port, and an oil inlet / outlet. The first oil port communicates with the upper low-pressure chamber, the second oil port communicates with the lower low-pressure chamber, the high-pressure oil port is connected to an outer high-pressure oil channel, and both the upper and lower return oil ports communicate with a return oil channel. The return oil channel communicates with the low-pressure output port channel through the inner cavity of the lower water outlet section. The upper cross-sectional area of ​​the control valve core is smaller than its lower cross-sectional area, and two annular grooves are formed on the outer circumferential surface of the control valve core. When the control valve core is in an upward position, the high-pressure oil port communicates with the second oil port, while the first oil port communicates with the upper return oil port. When the control valve core is in a downward position, the high-pressure oil port communicates with the first oil port, while the second oil port communicates with the lower return oil port.

[0010] Both the upper high-pressure piston and the lower high-pressure piston have annular connecting grooves on their circumferential surfaces. The sidewall of the booster stub has an axial first bypass channel and radial oil inlet channel, oil return channel, first control channel, second control channel, and second bypass channel. The first and second control channels are connected to the lower chamber of the control valve core via the first bypass channel through the oil inlet and outlet. When the low-pressure piston is at its lowest position, the oil inlet channel is connected to the first control channel via the connecting groove of the upper high-pressure piston, and the oil inlet channel is connected to the outer high-pressure oil channel. When the low-pressure piston is at its highest position, the oil return channel is connected to the second control channel via the connecting groove of the lower high-pressure piston, and the oil return channel is connected to the return channel of the hydraulic automatic reversing control valve. The outer high-pressure oil channel is connected to the upper chamber of the control valve core via the second bypass channel through the oil inlet of the main valve body.

[0011] The retrieval head is equipped with three elastic positioning claws for tool positioning, and the retrieval head is equipped with a positioning groove and a limiting step for wire casting. The lower end of the retrieval head is provided with an internal thread, and the retrieval head is connected to the upper cylinder by the thread.

[0012] The upper outlet section is embedded inside the lower end of the upper cylinder, and the water injection safety valve is installed on the upper part of the upper outlet section. Both the upper and lower ends of the upper outlet section are provided with external threads, and the upper and lower ends of the upper outlet section are respectively connected to the upper cylinder and the pressurization section through threads. The upper and lower ends of the outer wall of the upper outlet section are respectively provided with an upper UT disc pressure ring and an upper UT disc. The upper UT disc pressure ring and the upper UT disc are respectively located at the upper and lower ends of the high pressure output channel. The upper UT disc pressure ring is located between the upper cylinder and the upper outlet section, and the upper UT disc is located between the upper outlet section and the pressurization section.

[0013] Both ends of the lower outlet section are provided with external threads, and the upper and lower ends of the lower outlet section are respectively connected to the pressurization section and the lower cylinder through threads; the upper and lower ends of the outer wall of the lower outlet section are respectively provided with a lower UT disc pressure ring and a lower UT disc, the lower UT disc pressure ring and the lower UT disc are respectively located at the upper and lower ends of the low pressure output channel, the lower UT disc pressure ring is located between the pressurization section and the lower outlet section, and the lower UT disc is located between the lower outlet section and the lower cylinder.

[0014] The booster sub section has a stepped columnar mounting groove on its upper surface, which is used to install the piston sleeve, upper high-pressure piston, low-pressure piston and lower high-pressure piston. The booster sub section also has a mounting groove on its lower surface, which is used to install the hydraulic automatic directional control valve.

[0015] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0016] This invention achieves bidirectional pressurization by switching between different working states of the pressurization section and the hydraulic automatic reversing control valve. The pressurization ratio can be controlled by utilizing the difference in area between the high-pressure and low-pressure pistons to obtain the required pressure. At the same time, a small diameter and large displacement can be achieved by combining the piston area, stroke and frequency of the pressurization section.

[0017] This invention relates to a drop-and-retrieve downhole small-diameter, large-displacement hydraulic pulse booster device. The device uses a hydraulic automatic directional control valve to switch the oil circuit direction by moving the control valve core up and down. This causes the low-pressure piston, upper high-pressure piston, and lower high-pressure piston of the booster section to move up and down together, continuously outputting high pressure. The hydraulic automatic directional control valve in this invention has a simpler structure and is a single-stage control, preventing a decrease in the boosting frequency. Therefore, it is reliable in operation and can achieve high-frequency boosting. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the drop-and-retrieve downhole small-diameter large-displacement hydraulic pulse booster device of the present invention;

[0019] Figure 2 This is a schematic diagram of the pressurization section and the hydraulic automatic reversing control valve section in this invention;

[0020] Figure 3 This is a schematic diagram of the hydraulic automatic directional control valve in this invention;

[0021] Figure 4 This is a schematic diagram of the control valve core of the hydraulic automatic directional control valve in this invention;

[0022] Figure 5 , Figure 6 , Figure 7 This is a partial cross-sectional view of the present invention;

[0023] Figure 8 This is a schematic diagram of the left boosting process of the present invention;

[0024] Figure 9 This is a schematic diagram of the left boosting process of the present invention;

[0025] Figure 10 This is a schematic diagram showing the low-pressure piston moving to the left limit position during the left boosting process of the present invention;

[0026] Figure 11 This is a schematic diagram illustrating the principle of the low-pressure piston moving to the left limit position during the left boosting process of the present invention;

[0027] Figure 12 This is a schematic diagram of the right-side boosting process of the present invention;

[0028] Figure 13 This is a schematic diagram of the right-side boosting process of the present invention;

[0029] Figure 14 This is a schematic diagram showing the low-pressure piston moving to the right limit position during the right-side pressurization process of the present invention;

[0030] Figure 15 This is a schematic diagram illustrating the principle of the low-pressure piston moving to the right limit position during the right-side pressurization process of the present invention.

[0031] Attached reference numerals: 1-Retrieval head, 2-Upper cylinder, 3-Injection safety valve, 4-Upper outlet stub, 5-Upper UT disc pressure ring, 6-Upper UT disc, 7-Pressure booster stub, 8-Piston sleeve, 9-Upper outlet check valve, 10-Upper inlet check valve, 11-Upper high-pressure piston, 12-Low-pressure piston, 13-Lower high-pressure piston, 14-Lower inlet check valve, 15-Lower outlet check valve, 16-Hydraulic automatic reversing control valve, 1601-Main valve body, 1602-Control valve core, 17-Sealing plug, 18-Lower outlet stub, 19-Lower UT disc pressure ring, 20-Lower UT disc, 21-Lower cylinder, 22-Connecting groove;

[0032] H - High-pressure output port channel, T - Low-pressure output port channel, UH - Upper high-pressure chamber, LH - Lower high-pressure chamber, UL - Upper low-pressure chamber, LL - Lower low-pressure chamber, B1 - Oil inlet, B2 - Upper return oil port, B3 - First oil port, B4 - High-pressure oil port, B5 - Second oil port, B6 - Lower return oil port, B7 - Oil inlet / outlet, L1 - Return oil channel, L2 - First bypass channel, L3 - Oil inlet flow channel, L4 - Return oil flow channel, L5 - First control flow channel, L6 - Second control flow channel, L7 - Second bypass channel, L8 - Axial channel. Detailed Implementation

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] like Figure 1 As shown, the present invention is a drop-and-retrieve downhole small-diameter large-displacement hydraulic pulse booster device, which mainly includes components connected from top to bottom such as a retrieval head 1, an upper cylinder 2, an upper water outlet section 4, a booster section 7, a lower water outlet section 18, and a lower cylinder 21.

[0035] The retrieval head 1 is equipped with three elastic positioning claws for tool positioning. The retrieval head 1 has a positioning groove and a limiting step for wire casting. The lower end of the retrieval head 1 is provided with an internal thread, and the retrieval head 1 is connected to the upper cylinder 2 by the thread.

[0036] The upper outlet section 4 is embedded inside the lower end of the upper cylinder 2, and the water injection safety valve 3 is installed on the top of the upper outlet section 4. The injection safety valve 3 is located inside the upper cylinder 2, so that the tool can still be used without affecting production if the pressurization device fails to operate. Both the upper and lower ends of the upper outlet section 4 are provided with external threads, and the upper and lower ends of the upper outlet section 4 are respectively connected to the upper cylinder 2 and the pressurization section 7 through threads. The side wall of the upper outlet section 4 is provided with a radial high-pressure output port channel H. The upper UT disc pressure ring 5 and the upper UT disc 6 are respectively provided at the upper and lower ends of the outer wall of the upper outlet section 4. The upper UT disc pressure ring 5 is located between the upper cylinder 2 and the upper outlet section 4, and the upper UT disc 6 is located between the upper outlet section 4 and the pressurization section 7. The upper UT disc pressure ring 5 and the upper UT disc 6 are located at the upper and lower ends of the high-pressure output port channel H, respectively, to achieve sealed isolation between the pressure input end and the pressure output end.

[0037] Both ends of the lower outlet section 18 are provided with external threads, and the upper and lower ends of the lower outlet section 18 are respectively connected to the booster section 7 and the lower cylinder 21 through threads. The side wall of the lower outlet section 18 is provided with a radial low-pressure output port channel T. The upper and lower ends of the outer wall of the lower outlet section 18 are respectively provided with a lower UT disc pressure ring 19 and a lower UT disc 20. The lower UT disc pressure ring 19 is located between the booster section 7 and the lower outlet section 18, and the lower UT disc 20 is located between the lower outlet section 18 and the lower cylinder 21. The lower UT disc pressure ring 19 and the lower UT disc 20 are respectively located at the upper and lower ends of the low-pressure output port channel T, realizing the sealing and isolation of the low-pressure output end.

[0038] The pressure boosting section 7 has a piston sleeve 8 inside its upper end. The pressure boosting section 7 includes a pressure boosting part and a hydraulic automatic directional control valve 16. The pressure boosting part is coaxially arranged with the piston sleeve 8 and located at its lower end. The hydraulic automatic directional control valve 16 is embedded upwards from the lower surface of the pressure boosting section 7 and is axially fixed by a sealing plug 17. The pressure boosting section 7 has a stepped columnar mounting groove on its upper surface for mounting components such as the piston sleeve 8, upper high-pressure piston 11, low-pressure piston 12, and lower high-pressure piston 13. The pressure boosting section 7 also has a mounting groove on its lower surface for mounting the hydraulic automatic directional control valve 16, with the lower opening of the mounting groove sealed by the sealing plug 17.

[0039] like Figure 2As shown, the pressurization section includes an upper high-pressure piston 11, a low-pressure piston 12, and a lower high-pressure piston 13 connected sequentially from top to bottom. The upper end of the upper high-pressure piston 11 extends into the piston sleeve 8, forming an upper high-pressure chamber UH above it. The low-pressure piston 12 is located in the cavity between the lower surface of the piston sleeve 8 and the inner wall of the pressurization stub 7, forming an upper low-pressure chamber UL and a lower low-pressure chamber LL above and below it, respectively. The lower end of the lower high-pressure piston 13 extends downward along the inner wall of the pressurization stub 7 and is embedded therein, forming a lower high-pressure chamber LH below it. The upper high-pressure chamber UH is connected to the high-pressure output port channel H through the upper liquid outlet check valve 9 and the inner cavity of the upper water outlet stub 4, and is also connected to the outer high-pressure oil channel through the upper liquid inlet check valve 10. The lower high-pressure chamber LH is connected to the high-pressure output port channel H via the axial channel 18 on the side wall of the pressure boosting section 7 and the inner cavity of the upper water outlet section 4 through the lower liquid outlet check valve 15. The lower high-pressure chamber LH is connected to the outer high-pressure oil channel through the lower liquid inlet check valve 14. To achieve the connection and communication of the above components, the required slots can be opened on the piston sleeve 8 and the pressure boosting section 7.

[0040] like Figures 3 to 7 As shown, the hydraulic automatic directional control valve 16 includes a main valve body 1601 and a control valve core 1602. The control valve core 1602 is located inside the main valve body 1601, and its upper and lower ends form an upper chamber and a lower chamber, respectively. The main valve body 1601 has, from top to bottom, radially arranged oil inlet B1, upper return oil inlet B2, first oil inlet B3, high-pressure oil inlet B4, second oil inlet B5, lower return oil inlet B6, and oil inlet / outlet B7, with multiple inlets / outlets arranged circumferentially. By opening various necessary channels on the pressure boosting sub 7, the first oil inlet B3 is connected to the upper low-pressure chamber UL, the second oil inlet B5 is connected to the lower low-pressure chamber LL, the high-pressure oil inlet B4 is connected to the outer high-pressure oil channel, and both the upper return oil inlet B2 and the lower return oil inlet B6 are connected to the return oil channel L1. The return oil channel L1 is connected to the low-pressure output channel T through the inner cavity of the lower outlet sub 18. The upper cross-sectional area of ​​the control valve core 1602 is smaller than its lower cross-sectional area, and two annular grooves are formed on the outer circumferential surface of the control valve core 1602. When the control valve core 1602 is in an upward position, the annular grooves on its outer wall connect the high-pressure oil port B4 to the second oil port B5, while the first oil port B3 connects to the upper return oil port B2. When the control valve core 1602 is in a downward position, the annular grooves on its outer wall connect the high-pressure oil port B4 to the first oil port B3, while the second oil port B5 connects to the lower return oil port B6.

[0041] Both the upper high-pressure piston 11 and the lower high-pressure piston 13 have annular connecting grooves 22 on their circumferential surfaces. The sidewall of the booster section 7 has an axial first bypass channel L2 and radial oil inlet channel L3, oil return channel L4, a first control channel L5, a second control channel L6, and a second bypass channel L7. The first control channel L5 and the second control channel L6 are both connected to the lower chamber of the control valve core 1602 via the first bypass channel L2 and oil inlet / outlet B7. Correspondingly, the piston sleeve 8 has radial through grooves, coaxial with the first control channel L5 and the oil inlet channel L3, respectively. When the low-pressure piston 12 is at its lowest position, the oil inlet channel L3 is connected to the first control channel L5 via the connecting groove 22 of the upper high-pressure piston 11, and the oil inlet channel L3 is connected to the outer high-pressure oil channel. When the low-pressure piston 12 is at its uppermost position, the return oil channel L4 is connected to the second control channel L6 through the connecting groove 22 of the lower high-pressure piston 13. The return oil channel L4 is also connected to the return oil passage L1 of the hydraulic automatic reversing control valve 16. The outer high-pressure oil passage is connected to the upper chamber of the control valve core 1602 through the second bypass passage L7 and the oil inlet B1 of the main valve body 1601.

[0042] In this invention, the outer high-pressure oil channels are mainly divided into five paths: the first outer high-pressure oil channel P1 is connected to the upper high-pressure chamber through the upper inlet flow valve 10; the second outer high-pressure oil channel P2 is connected to the oil inlet channel of the booster section; the third outer high-pressure oil channel P3 is connected to the lower high-pressure chamber through the lower inlet flow valve 14; the fourth outer high-pressure oil channel P4 is connected to the upper chamber of the control valve core through the second bypass channel; and the fifth outer high-pressure oil channel P5 is connected to the high-pressure oil port B4 of the hydraulic automatic reversing control valve.

[0043] The specific pressurization process of the drop-and-retrieve downhole small-diameter, large-displacement hydraulic pulse booster device of the present invention is as follows:

[0044] (1) Left boost process:

[0045] like Figure 8 and Figure 9 As shown, when the control valve core 1602 of the hydraulic automatic directional control valve 16 moves to a certain position to the left, the high-pressure oil port B4 connects to the second oil port B5, the first oil port B3 connects to the upper return oil port B2, and the first oil port B3 connects to the upper low-pressure chamber UL, while the second oil port B5 connects to the lower low-pressure chamber LL. At this time, the high-pressure oil entering from the fifth outer high-pressure oil channel P5 enters the lower low-pressure chamber LL through the second oil port B5, pushing the low-pressure piston 12 to move to the left, and the upper outlet check valve 9 opens. The oil in the upper low-pressure chamber UL enters the inner cavity of the lower outlet stub 18 through the first oil port B3, the upper return oil port B2, and the return oil channel L1 in sequence, and is finally discharged through the low-pressure output channel T. The oil in the upper high-pressure chamber UH enters the inner cavity of the upper outlet stub 4 through the upper outlet check valve 9, and is finally discharged through the high-pressure output channel H.

[0046] (2) When the low-pressure piston 12 moves to the left limit position, as Figure 10 and Figure 11 As shown, the second control flow channel L6 is connected to the oil inlet and outlet B7 of the hydraulic automatic reversing control valve 16 via the first bypass channel L2. The second control flow channel L6 is connected to the return oil flow channel L4 via the connecting groove 22 of the lower high-pressure piston 13. The return oil flow channel L4 is connected to the return oil channel L1. The return oil channel L1 is connected to the low-pressure output port channel T via the inner cavity of the lower water outlet section 18. At this time, the lower chamber of the control valve core 1602 is connected to the low-pressure output port channel T. The lower chamber of the control valve core 1602 is equivalent to the low-pressure zone, and the pressure is less than the high-pressure oil pressure coming in from the fourth outer high-pressure oil channel P4. The control valve core 1602 moves to the right.

[0047] (3) Right boost process

[0048] like Figure 12 and Figure 13 As shown, when the control valve core 1602 of the hydraulic automatic directional control valve 16 moves to a certain position to the right, the high-pressure oil port B4 is connected to the first oil port B3, the second oil port is connected to the lower return oil port B6 of B5, the first oil port B3 is connected to the upper low-pressure chamber UL, and the second oil port B5 is connected to the lower low-pressure chamber LL. At this time, the high-pressure oil entering from the fifth outer high-pressure oil channel P5 enters the upper low-pressure chamber UL through the first oil port B3, pushing the low-pressure piston 12 to move to the right, and the lower outlet check valve 15 opens. The oil in the lower low-pressure chamber LL enters the inner cavity of the lower outlet stub 18 through the second oil port B5, the lower return oil port B6, and the return oil channel L1 in sequence, and is finally discharged through the low-pressure output port channel T. The oil in the lower high-pressure chamber LH enters the inner cavity of the lower outlet stub 18 through the lower outlet check valve 15, the axial channel L8, and the upper outlet stub 4 in sequence, and is finally discharged through the high-pressure output port channel H.

[0049] (4) When the low-pressure piston 12 moves to the right limit, such as Figure 14 and Figure 15 As shown, the first control flow channel L5 is connected to the oil inlet / outlet B7 of the hydraulic automatic reversing control valve 16 via the first bypass channel L2. The first control flow channel L5 is connected to the oil inlet flow channel L3 via the connecting groove 22 of the upper high-pressure piston 11. The high-pressure oil coming in from the second outer high-pressure oil channel P2 passes through the oil inlet flow channel L3, the first control flow channel L5, the first bypass channel L2, and the oil inlet / outlet B7 of the hydraulic automatic reversing control valve 16 in sequence, and enters the lower chamber of the control valve core 1602. Since the upper cross-sectional area of ​​the control valve core 1602 is smaller than the lower cross-sectional area, the control valve core 1602 moves to the left.

[0050] The above process is repeated to achieve reverse pressure boosting.

[0051] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific functions and working processes described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these are within the protection scope of the present invention.

Claims

1. A deployable, retrievable downhole small-diameter, large-displacement hydraulic pulse booster device, characterized in that, The device includes a salvage head (1), an upper cylinder (2), an upper water outlet section (4), a pressurization section (7), a lower water outlet section (18), and a lower cylinder (21) connected from top to bottom. The upper water outlet section (4) is equipped with an injection safety valve (3) at the top, and the injection safety valve (3) is located inside the upper cylinder (2). The upper water outlet section (4) has a radial high-pressure output channel (H) on its side wall, and the lower water outlet section (18) has a radial low-pressure output channel (T) on its side wall. The upper part of the pressurizing short section (7) is provided with a piston sleeve (8). The pressurizing short section (7) is provided with a pressurizing part and a hydraulic automatic reversing control valve (16). The pressurizing part is coaxially arranged with the piston sleeve (8) and located at the lower end of the piston sleeve (8). The hydraulic automatic reversing control valve (16) is embedded from the lower surface of the pressurizing short section (7) and is axially fixed by a sealing plug (17). The pressurization section includes an upper high-pressure piston (11), a low-pressure piston (12), and a lower high-pressure piston (13) connected sequentially from top to bottom. The upper high-pressure piston (11) extends into the piston sleeve (8) at its upper end, forming an upper high-pressure chamber (UH) above it. The low-pressure piston (12) is located in the cavity between the lower surface of the piston sleeve (8) and the inner wall of the pressurization stub (7), forming an upper low-pressure chamber (UL) and a lower low-pressure chamber (LL) above and below it, respectively. The lower high-pressure piston (13) extends downward along the inner wall of the pressurization stub (7) and is embedded in the lower high-pressure chamber. A lower high-pressure chamber (LH) is formed below the piston (13); the upper high-pressure chamber (UH) is connected to the high-pressure output port channel (H) through the upper liquid outlet check valve (9) via the inner cavity of the upper water outlet stub (4), and the upper high-pressure chamber (UH) is connected to the outer high-pressure oil channel through the upper liquid inlet check valve (10); the lower high-pressure chamber (LH) is connected to the high-pressure output port channel (H) through the lower liquid outlet check valve (15) via the axial channel (L8) on the side wall of the pressurizing stub (7) and the inner cavity of the upper water outlet stub (4), and the lower high-pressure chamber (LH) is connected to the outer high-pressure oil channel through the lower liquid inlet check valve (14); The hydraulic automatic directional control valve (16) includes a main valve body (1601) and a control valve core (1602). The control valve core (1602) is located inside the main valve body (1601), and the upper and lower parts of the control valve core (1602) form an upper chamber and a lower chamber, respectively. The side wall of the main valve body (1601) is provided with radial oil inlet (B1), upper return oil port (B2), first oil port (B3), high-pressure oil port (B4), second oil port (B5), lower return oil port (B6), and oil inlet / outlet (B7) from top to bottom. The first oil port (B3) is connected to the upper low-pressure chamber (UL), the second oil port (B5) is connected to the lower low-pressure chamber (LL), and the high-pressure oil port (B4) is connected to the outer high-pressure oil channel. Both the upper return port (B2) and the lower return port (B6) are connected to the return oil channel (L1), which is connected to the low-pressure output port channel (T) through the inner cavity of the lower outlet section (18). The upper cross-sectional area of ​​the control valve core (1602) is smaller than that of the lower cross-sectional area, and two annular grooves are formed on the outer circumferential surface of the control valve core (1602). When the control valve core (1602) is in the upward state, the high-pressure oil port (B4) is connected to the second oil port (B5), while the first oil port (B3) is connected to the upper return port (B2). When the control valve core (1602) is in the downward state, the high-pressure oil port (B4) is connected to the first oil port (B3), while the second oil port (B5) is connected to the lower return port (B6). The upper high-pressure piston (11) and the lower high-pressure piston (13) are both provided with annular connecting grooves (22) on their circumferential surfaces; the side wall of the booster stub (7) is provided with an axial first bypass channel (L2) and radial oil inlet channel (L3), oil return channel (L4), first control channel (L5), second control channel (L6), and second bypass channel (L7); the first control channel (L5) and the second control channel (L6) are both connected to the lower chamber of the control valve core (1602) through the first bypass channel (L2) via the oil inlet and outlet (B7); when the low-pressure piston (12) is moved to the lowest position, the oil inlet... The flow channel (L3) is connected to the first control flow channel (L5) through the connecting groove (22) of the upper high-pressure piston (11), and the oil inlet flow channel (L3) is connected to the outer high-pressure oil channel; when the low-pressure piston (12) moves to the uppermost position, the oil return flow channel (L4) is connected to the second control flow channel (L6) through the connecting groove (22) of the lower high-pressure piston (13), and the oil return flow channel (L4) is connected to the oil return channel (L1) of the hydraulic automatic reversing control valve (16); the outer high-pressure oil channel is connected to the upper chamber of the control valve core (1602) through the oil inlet (B1) of the main valve body (1601) via the second bypass channel (L7).

2. The deployable, retrieval-type downhole small-diameter, large-displacement hydraulic pulse booster device according to claim 1, characterized in that, The retrieval head (1) is provided with three elastic positioning claws for positioning the tool. The retrieval head (1) is provided with a positioning groove and a limiting step for casting steel wire. The lower end of the retrieval head (1) is provided with an internal thread. The retrieval head (1) is connected to the upper cylinder (2) by a thread.

3. The deployable, retrieval-type downhole small-diameter, large-displacement hydraulic pulse booster device according to claim 1, characterized in that, The upper end of the upper outlet short section (4) is embedded inside the lower end of the upper cylinder (2), and the injection safety valve (3) is installed on the upper part of the upper outlet short section (4). Both the upper and lower ends of the upper outlet short section (4) are provided with external threads. The upper and lower ends of the upper outlet short section (4) are respectively connected to the upper cylinder (2) and the pressurization short section (7) through threads. The upper and lower ends of the outer wall of the upper outlet short section (4) are respectively provided with an upper UT disc pressure ring (5) and an upper UT disc (6). The upper UT disc pressure ring (5) and the upper UT disc (6) are respectively located at the upper and lower ends of the high pressure output channel (H). The upper UT disc pressure ring (5) is located between the upper cylinder (2) and the upper outlet short section (4), and the upper UT disc (6) is located between the upper outlet short section (4) and the pressurization short section (7).

4. The deployable, retrieval-type downhole small-diameter, large-displacement hydraulic pulse booster device according to claim 1, characterized in that, The lower outlet section (18) is provided with external threads at both ends. The lower outlet section (18) is connected to the booster section (7) and the lower cylinder (21) respectively through threads at both ends. The lower outlet section (18) is provided with a lower UT disc pressure ring (19) and a lower UT disc (20) at both ends of the outer wall. The lower UT disc pressure ring (19) and the lower UT disc (20) are located at the upper and lower ends of the low pressure output channel (T) respectively. The lower UT disc pressure ring (19) is located between the booster section (7) and the lower outlet section (18). The lower UT disc (20) is located between the lower outlet section (18) and the lower cylinder (21).

5. The deployable, retrieval-type downhole small-diameter, large-displacement hydraulic pulse booster device according to claim 1, characterized in that, The booster section (7) has a stepped columnar mounting groove on its upper surface, which is used to install the piston sleeve (8), the upper high-pressure piston (11), the low-pressure piston (12) and the lower high-pressure piston (13). The booster section (7) has a mounting groove on its lower surface, which is used to install the hydraulic automatic directional control valve (16).

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