High pressure water pressure biased push-pull valve

Abstract

The embodiment of the application provides a high-pressure water pressure bias push-pull valve, and relates to the technical field of drilling high-pressure water pressure testing. The high-pressure water pressure bias push-pull valve comprises a valve core 10, a valve body upper portion 20 and a valve body middle portion 30; the first end of the valve core 10 is connected with a valve upper joint 50; the valve core channel A21 is arranged eccentrically in the valve body upper portion 20, a sealing groove A is formed in the valve core channel A21, and a sealing ring A22 is clamped in the sealing groove A. The second end of the valve body middle portion 30 is connected with a connecting pipe 80, and the valve body middle portion 30 is provided with a bias water pressure channel 33 and a seat sealing channel 34 along the length direction. The high-pressure fluid channel can be switched quickly, and the high-pressure water pressure test can be performed on a deep hole. In addition, the bias scheme of the push-pull valve not only enlarges the overall area of the water pressure channel, but also improves the overall strength of the push-pull valve. The valve body is designed in a split type to realize independent shaft shoulder positioning, so that the installation conflict between the shaft shoulder positioning and the overall bias scheme is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-pressure water pressure test, in particular, to a high-pressure water pressure bias push-pull valve. BACKGROUND

[0002] At present, fissure rock mass seepage is a problem often encountered in the fields of hydropower engineering construction, nuclear waste geological disposal and oil field development, and the determination of the permeability of fissure rock mass is the key to the establishment and calculation of the seepage model. The permeability coefficient is a physical index reflecting the permeability of rock mass, and is one of the key parameters for predicting the water inflow of a mine (or working face). In the geological survey of pressure-bearing projects such as water conservancy and hydropower, underground caverns, deep tunnels and high dams, it is crucial to accurately grasp the permeability characteristics of rock mass under high water head, which is directly related to the safety of the project and the effectiveness of the anti-seepage design. One of the most commonly used methods to determine the permeability characteristics of fissure rock mass is borehole water pressure test, which is an in-situ permeability test conducted in a borehole. The water is pressed into the fissures around the borehole wall by using the self-weight pressure of the water column or mechanical (pump) pressure, and then the amount of water pressed in per unit time is measured under certain conditions to measure the permeability of the rock mass. As an in-situ permeability test method, conventional water pressure test can detect the water permeability of rock mass under low pressure conditions, evaluate the permeability, and qualitatively understand the fissure development degree of rock layers at different depths, and provide basic reference data for anti-seepage design.

[0003] However, with the development of large-scale water conservancy and hydropower projects towards high water head and deep burial, the conventional water pressure test cannot meet the requirements due to its limited maximum test pressure. The fundamental limitation is that it cannot simulate the true response of rock mass under high water head pressure: under the action of high-pressure water flow, the complete rock mass and the weak structural planes (such as joints, fault fracture zones, etc.) in the rock mass may be subjected to hydraulic fracturing, opening or expansion, significantly changing the original water permeability of the rock mass, and leading to the fact that the conventional test results cannot truly reflect the seepage characteristics under the running state of the project. At this time, the conventional water pressure test cannot accurately reflect the permeability characteristics of rock mass under actual water head pressure, so high-pressure water pressure test should be carried out. High-pressure water pressure test can not only truly reflect the permeability characteristics of fissure rock mass, but also evaluate the critical pressure value of various structural planes resisting hydraulic fracturing damage, providing a basis for the grouting treatment of fissure rock mass in underground engineering. High-pressure water pressure test can better understand the permeability of rock mass under high-pressure water flow, obtain the critical pressure, deformation mode of opening and cracking under high-pressure permeation, and reliable data of the permeability coefficient of rock mass under the running state of the project.

[0004] The core of high-pressure water pressure test method is to test under the pressure equal to or greater than the actual pressure of the surrounding rock where the project is located. For the pre-selected high-pressure water test section, high-pressure water pressure test isolates a certain length of the test section of the drill hole by using special water stopping equipment (such as water pressure cross-connection type high-pressure packer, water swelling type packer with effective length greater than 10 times the hole diameter) to form a closed cavity. Then, using a high-pressure water pump in a step-by-step pressure boosting manner, a fixed water pressure is applied to the test section. The water flow penetrates into the rock mass through the fissures around the hole wall under the action of pressure until the water penetration reaches a steady state. During the test process, the injection flow and pressure data at each pressure stage are continuously and automatically recorded by intelligent high-pressure flow meters, pressure sensors, pressure gauges and data acquisition instruments. High-pressure water pressure test sets up a water pressure hole and an observation hole, and when the water pressure reaches a relatively stable state, the water flow in the rock mass can be considered as a steady flow. At this time, the water pressure in the water pressure hole, the water pressure in the observation hole and the pressure injection flow can be used to calculate the permeability coefficient of the rock mass. The purpose of the high-pressure water pressure test of the drill hole is to determine the water permeability of the rock mass and provide reference data for evaluating the permeability of the rock mass and the anti-seepage measures. The ground equipment of general high-pressure water pressure test mainly includes high-pressure water pump, flow meter, pressure gauge / sensor, high-pressure control pipeline, valve and data acquisition system; the in-hole equipment includes push-pull valve and cross-connection packer.

[0005] High-pressure water pressure test not only can more truly reflect the permeability characteristics of fissured rock mass under high water head, but also can evaluate the critical pressure value of various structural planes resisting hydraulic fracturing failure. In the selection of structure type of high water head power station, high pressure tunnel and branch pipe, the determination of anti-seepage treatment (especially grouting pressure), the evaluation of permeability stability, the performance of surrounding rock barrier of nuclear waste geological disposal repository, the prediction of permeability mutation of surrounding rock under the disturbance of deep coal seam mining, high-pressure water pressure test has extremely important significance. Since the 1970s of last century, some large-scale hydropower projects in China have carried out research work on high-pressure water pressure test. According to the existing data, at present, most of the specifications in China refer to the “Drilling Water Pressure Test Specification for Hydropower Engineering” issued by the State Energy Administration in 2018. There are already more than ten hydropower projects in China that have carried out high-pressure water pressure test work, and the research on high-pressure water pressure test theory also has different research results.

[0006] The widely used high-pressure water pressure measurement system in China consists of six parts: pressure fluid control system, high-pressure water pump, power system, data recording system, cross-connection packer and high-pressure fluid conveying system. This measurement system is divided into two types, one is for shallow holes of 100 m, we can use drill pipe and high-pressure hose to supply water to the packer and test section respectively to realize high-pressure water pressure. The other equipment is for deep hole measurement above 100 m, we use a conversion valve to supply pressure liquid to the test section and the packer respectively, and the test system diagram is shown in Figure 17 、 Figure 18 ​

[0007] The prior art in the above has the following defects: through the previous analysis, the double-circuit test system forms two pressure channels with the long high-pressure water pipe and the drill pipe outside the packer, is suitable for shallow borehole test and has complex operation, and has limitations. With the increasing depth of underground engineering, deep geological drilling will be widespread, and generally only single-circuit test system can be selected for testing. In the high-pressure water pressure test device, the single-circuit test system with push-pull valve has high pressure resistance and strength requirements for the pipeline as a whole; and in order to ensure the accuracy of the test results, a water pressure channel with sufficient size is required to meet the flow requirements of high-pressure fluid, which undoubtedly limits the strength of the pipeline, especially the push-pull valve, so a solution is needed to balance between the two. SUMMARY

[0008] The present application aims to at least solve one of the technical problems existing in the prior art. The high-pressure water pressure biased push-pull valve according to the embodiments of the present application comprises a valve core, a valve body and a valve body;

[0009] The first end of the valve core is connected with a valve upper joint, the valve core is provided with a central hole, and the second end of the valve core is provided with a water outlet hole in the side wall; the valve body is provided with a valve core channel A along the length direction, the valve core channel A is provided in the valve body, the valve core channel A is provided with a sealing groove A, the sealing groove A is provided with a sealing ring A, the second end of the valve core is connected and matched with the valve core channel A, the outer surface of the valve core is in sealing contact with the sealing ring A, the side wall of the valve core channel A is provided with a jack hole, and the jack hole is provided with a jack in threaded connection, and the jack and the threaded hole are provided with a mesh for filtering; the sealing measures of the two hard and soft O-shaped rubber sealing rings of the old push-pull valve are changed to all use soft sealing rings for sealing, which can facilitate installation and greatly improve the implementation efficiency.

[0010] The first end in the valve body is fixedly connected with the valve body, the first end in the valve body is provided with a valve core channel B along the axial direction, the valve core channel B is provided in the valve body, the inner wall of the valve core channel B is provided with a sealing groove B, the sealing groove B is provided with a sealing ring B, the valve core channel B is connected with the valve core channel A, the second end in the valve body is connected with a connecting pipe, and the valve body is provided with a biased water pressure channel and a seat sealing channel along the length direction.

[0011] The high-pressure water bias push-pull valve according to the embodiment of the application changes the matching position of the valve body and the valve core from the center to the bias, and changes the position of the water pressure channel from the symmetrical surrounding to the full placement on one side, thereby increasing the overall area of the water pressure channel and improving the strength of the push-pull valve; the high-pressure fluid channel switching of the packer seat sealing section and the water pressure section is realized by the push-pull valve connected between the drill pipe and the double plug packer, which is suitable for the rapid and continuous testing of the deep borehole and is simple and convenient to operate. The high-pressure fluid channel switching is realized by the push-pull valve in the high-pressure water testing, the pressurization and pressure relief processes are accurately controlled, and thus the accuracy and safety of the testing are ensured.

[0012] Compared with the double-circuit test system which needs to be connected with a rubber water pipe, the single-circuit test system realized by the push-pull valve can realize the rapid switching of the high-pressure fluid channel and the high-pressure water testing of the deep borehole. In addition, the bias scheme of the push-pull valve not only enlarges the overall area of the water pressure channel, but also improves the overall strength of the push-pull valve. The valve body is designed in a split type to realize the independence of the shaft shoulder positioning, thereby avoiding the installation conflict between the shaft shoulder positioning and the overall bias scheme.

[0013] In addition, the high-pressure water bias push-pull valve according to the embodiment of the application has the following additional technical features:

[0014] In a preferred mode of the application, a conical threaded hole is formed in one end of the valve upper joint, a threaded groove A is formed in the first end of the valve core, the threaded groove A is connected in the conical threaded hole in a sealing threaded connection mode, and the second end of the valve core is axially moved inside the valve core channel A and the valve core channel B to realize the switching of the water pressure channel and the seat sealing channel.

[0015] In a preferred mode of the application, a plug is connected to the second end of the valve core, and a plurality of water outlet holes are formed along the circumferential surface of the valve core. The high-pressure fluid channel inside the valve core flows the high-pressure fluid from the drill pipe to the seat sealing or water pressure channel through the plurality of water outlet holes at the other end.

[0016] In a preferred mode of the application, a backup nipple connecting section and a valve body connecting section are arranged on the surface of the valve core, a backup nipple is arranged at the backup nipple connecting section, and a valve body connecting piece is arranged at the valve body connecting section.

[0017] The inner wall of the backup nipple and the outer wall of the valve core are fixedly connected through a threaded connection, one end of the backup nipple is attached to the valve upper joint, and one end of the valve body connecting piece is fixedly connected to the valve body through a threaded connection.

[0018] In a preferred mode of the present application, the first end of the valve body is connected by screw thread, the second end of the valve body is connected with the connecting pipe by screw thread, and the side of the valve body is also provided with a tapping hole for a tapping screw thread, and a filter screen is arranged between the tapping screw thread and the tapping hole. The valve body is made of steel, and the two ends of the valve body are provided with screw threads for connecting the valve body and the connecting pipe, respectively. The valve core channel B and the valve core channel A are designed to allow the valve core to move axially to switch the high-pressure fluid channel, and the inner hole matched with the valve core is biased downward. The valve body is also provided with a water pressure switching channel and a seat sealing channel for switching, which are biased to one side and used for high-pressure water and packer inflation, respectively.

[0019] In a preferred mode of the present application, the valve core channel B has the same inner diameter as the valve core channel A, and the sealing ring A and the sealing ring B arranged in the valve core channel B have the same structure.

[0020] In a preferred mode of the present application, one end of the valve upper connector is provided with a tapered notch, the tapered notch is connected with a filter pipe, the valve upper connector is provided with a conical thread hole which is in communication with the tapered notch, and a filter pipe channel is arranged between the bottom of the tapered notch and the conical thread hole. One side of the valve upper connector is connected with a drill pipe through a screw thread, and the filter pipe is connected through the filter pipe channel to filter the high-pressure fluid in the drill pipe. The other side of the valve upper connector is connected with the valve core through a screw thread and leads the filtered high-pressure fluid to the inside of the valve core. The screw thread position of the valve core is biased, and a slot is arranged in the middle of the valve upper connector to ensure the flow transition caused by the biasing scheme of the two sides. The filter pipe can filter out the high-pressure sealing tape, impurities and rust on the inner wall of the drill pipe which may be carried by the high-pressure fluid in the test, so as to ensure the smooth progress of the high-pressure water test.

[0021] In a preferred mode of the present application, the two ends of the valve body are provided with a valve body mating interface and a connecting piece interface, respectively, one end of the valve core channel A is in communication with the valve body mating interface, and the other end of the valve core channel A is in communication with the connecting piece interface. The valve body mating interface is sealingly connected with one end of the valve body, and the connecting piece interface is sealingly connected with the valve body connecting piece.

[0022] In a preferred mode of the present application, the second end of the valve body is provided with a connecting pipe interface, the connecting pipe interface is in communication with the water pressure channel, and one end of the connecting pipe is sealingly connected with the connecting pipe interface.

[0023] In a preferred mode of the present application, the inner side of the valve body connecting piece is provided with a shoulder positioning groove, the surface of the valve core is provided with a shoulder at the intersection of the valve core connecting segment and the valve body connecting segment, the valve core is positioned by the shoulder positioning groove, and the outer side of the valve body connecting piece is connected with the valve body.

[0024] In a preferred mode of the present application, one end of the connecting pipe is connected with a packer connector, both sides of the packer connector are provided with external threads, and the two external threads are connected with the connecting pipe and the packer respectively, and the packer connector is hollowly provided with a water pressure channel.

[0025] In the valve body connector, the position of the shaft shoulder positioning groove is fixed, and the shaft shoulder position of the valve core can only be limited when the valve core is limited, so that the limiting function is single, and the adaptability to complex working environment is poor. Therefore, according to the specific implementation scheme of the high-pressure water bias push-pull valve of the present application:

[0026] In a preferred mode of the present application, a limiting sliding groove is formed in the inner wall of the valve body connector, a limiting sliding block is slidably connected in the limiting sliding groove, a rotating ring is rotatably connected to the outer surface of the valve body connector, an internal thread is formed in the inner wall of the rotating ring, a shaft shoulder sleeve is slidably connected in the valve body connector, the lower end of the limiting sliding block is connected to the surface of the shaft shoulder sleeve, and an external thread is formed in the upper end of the limiting sliding block and matched with the internal thread.

[0027] In a preferred mode of the present application, anti-skid lines are formed on the outer surface of the rotating ring, a prism is integrally formed on the outer surface of the valve body connector, a clamping spring is connected to the surface of the valve body connector, a limiting groove is formed between the clamping spring and the prism, and the rotating ring is rotatably connected in the limiting groove.

[0028] By rotating the rotating ring, the limiting sliding block is pushed to slide during the rotation of the rotating ring, the limiting sliding block drives the shaft shoulder sleeve to slide along the inner wall of the valve body connector, the position of the shaft shoulder positioning is adjusted, different use requirements are adjusted, different specifications of the valve core are adjusted and used, and more scenes are adapted.

[0029] The valve core slides in the valve body connector and collides with the shaft shoulder sleeve. Long-time collision impact can damage the structure of the valve body connector. Therefore, according to the specific implementation scheme of the high-pressure water bias push-pull valve of the present application:

[0030] In a preferred mode of the present application, a stop block is fixed to the outer surface of the shaft shoulder sleeve, one side of the stop block is connected with the limiting sliding block through a damper, the other side of the stop block is connected with the limiting sliding block through a compression spring, the limiting sliding block is hollowly provided with a containing groove, and the stop block is slidably connected in the containing groove.

[0031] In a preferred mode of the present application, the stop block is fixed to the end of the shaft shoulder sleeve, the damper and the compression spring are arranged in the containing groove, and a limiting block is fixed in the containing groove.

[0032] The end of the shaft shoulder sleeve is connected with the limiting sliding block through fixed stoppers, dampers arranged between the stoppers and the limiting sliding blocks cooperate with compression springs, so that good buffering damping effect is realized, the impact force of the valve core in the sliding process is offset, and the service life of the parts is prolonged.

[0033] In a preferred mode of the present application, the stoppers are symmetrically provided with two, the limiting sliding blocks are provided in one-to-one correspondence with the stoppers, and the outer thread grooves opened on the outer surfaces of the two limiting sliding blocks are the same outer thread.

[0034] Additional aspects and advantages of the application will be made apparent by the following description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 is a schematic diagram of the three-dimensional structure of the high-pressure water bias push-pull valve provided by the embodiments of the present application;

[0037] Figure 2 is a schematic diagram of the structure of the valve body provided by the embodiments of the present application;

[0038] Figure 3 is a schematic diagram of the structure of the valve body provided by the embodiments of the present application;

[0039] Figure 4 is a schematic diagram of the three-dimensional structure of the valve body provided by the embodiments of the present application;

[0040] Figure 5 is a schematic diagram of the structure of the push-pull valve provided by the embodiments of the present application;

[0041] Figure 6 is a schematic diagram of the structure of the valve body provided by the embodiments of the present application;

[0042] Figure 7 is a schematic diagram of the structure of the valve core provided by the embodiments of the present application;

[0043] Figure 8 is a schematic diagram of the structure of the valve provided by the embodiments of the present application;

[0044] Figure 9 is a schematic diagram of the structure of the valve body provided by the embodiments of the present application;

[0045] Figure 10 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0046] Figure 11 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure; Figure 10 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0047] Figure 12 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0048] Figure 13 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0049] Figure 14 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0050] Figure 15 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0051] Figure 16 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0052] Figure 17 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure;

[0053] Figure 18 Structure diagram of the shaft shoulder sleeve provided by the embodiment of the present application is shown in the following figure.

[0054] In the figure: 10, valve core; 11, water outlet hole; 12, plug; 13, spare female connecting section; 14, valve body connecting section; 15, center hole; 20, valve body upper; 21, valve core passage A; 22, sealing ring A; 23, top screw hole; 24, valve body middle butt joint; 25, connecting piece joint; 30, valve body middle; 31, valve core passage B; 32, sealing ring B; 33, water pressure passage; 34, seat sealing passage; 35, connecting pipe joint; 40, filter pipe; 50, valve upper joint; 51, filter pipe passage; 60, spare female; 70, valve body connecting piece; 701, snap spring; 703, prism; 71, limiting sliding groove; 72, limiting sliding block; 73, rotating ring; 74, shaft shoulder sleeve; 75, stop block; 76, damper; 77, compression spring; 78, limiting block; 80, connecting pipe; 90, packer connecting piece. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0057] The following describes a high-pressure water pressure biasing push-pull valve according to an embodiment of this application with reference to the accompanying drawings;

[0058] like Figures 1-16 As shown, the high-pressure water bias push-pull valve according to an embodiment of this application includes a valve core 10, an upper valve body 20, and a middle valve body 30.

[0059] The first end of the valve core 10 is connected to a valve connector 50. The valve core 10 is hollow and has a central hole 15. The second end of the valve core 10 has a water outlet hole 11 on its side wall. The valve body 20 has a valve core channel A21 along its length. The valve core channel A21 is eccentrically positioned within the valve body 20. A sealing groove A is formed within the valve core channel A21. A sealing ring A22 is snapped into the sealing groove A. The second end of the valve core 10 is connected and inserted into the valve core channel A21. The outer surface of the valve core 10 is in sealing contact with the sealing ring A22. A set screw hole 23 is formed on the side wall of the valve core channel A21. A set screw is threaded into the set screw hole 23. A mesh sheet for filtering is placed between the set screw and the threaded hole. The sealing method of the old-fashioned push-pull valve, which uses two hard and one soft O-ring rubber sealing rings, is changed to use soft sealing rings for sealing. This makes installation easier and greatly improves implementation efficiency.

[0060] The first end of the valve body 30 is fixedly connected to the valve body 20. The first end of the valve body 30 has a valve core channel B31 opened along the axial direction. The valve core channel B31 is also eccentrically arranged inside the valve body 30. The inner wall of the valve core channel B31 has a sealing groove B. A sealing ring B32 is snapped into the sealing groove B. The valve core channel B31 is connected to the valve core channel A21. The second end of the valve body 30 is connected to a connecting pipe 80. The valve body 30 has an offset pressure water channel 33 and a seat seal channel 34 opened along the length direction.

[0061] The high-pressure water bias push-pull valve according to the embodiment of the application changes the matching position of the valve body and the valve core 10 from the center to the bias, and changes the position of the water pressure channel 33 from the symmetrical surrounding to the full placement on one side, thereby increasing the overall area of the water pressure channel 33 and improving the strength of the push-pull valve; the high-pressure fluid channel switching of the packer seat sealing section and the water pressure section is realized by the push-pull valve connected between the drill pipe and the double plug packer, which is suitable for the rapid and continuous testing of the deep borehole and is simple and convenient to operate. The push-pull valve is mainly used for the rapid switching of the high-pressure fluid channel in the high-pressure water testing, the accurate control of the pressurization and pressure relief process, and the guarantee of the accuracy and safety of the testing.

[0062] Compared with the double-circuit test system which needs to be connected with the rubber water pipe, the single-circuit test system realized by the push-pull valve can realize the rapid switching of the high-pressure fluid channel and the high-pressure water testing of the deep borehole. In addition, the bias scheme of the push-pull valve not only enlarges the overall area of the water pressure channel, but also improves the overall strength of the push-pull valve. The split design of the valve body is used to realize the independence of the shaft shoulder positioning, so as to avoid the installation conflict between the shaft shoulder positioning and the overall bias scheme.

[0063] In addition, the high-pressure water bias push-pull valve according to the embodiment of the application also has the following additional technical features:

[0064] In the specific embodiment of the application, one end of the valve upper joint 50 is provided with a conical threaded hole, the first end of the valve core 10 is provided with a threaded groove A, the threaded groove A is matched and sealingly connected in the conical threaded hole, and the second end of the valve core 10 moves axially inside the valve core channel A21 and the valve core channel B31 to realize the switching of the water pressure channel and the seat sealing channel 34.

[0065] In the specific embodiment of the application, the second end of the valve core 10 is connected with a M14x1.5 thread protector 12, and a plurality of water outlets 11 are arranged along the circumferential surface of the valve core 10. The high-pressure fluid channel inside the valve core 10 flows the high-pressure fluid from the drill pipe to the seat sealing or water pressure channel through the plurality of water outlets 11 at the other end.

[0066] In the specific embodiment of the application, the surface of the valve core 10 is provided with a backup nipple connecting section 13 and a valve body connecting section 14, the backup nipple connecting section 13 is provided with a backup nipple 60, and the valve body connecting section 14 is provided with a valve body connecting piece 70.

[0067] The inner wall of the backup nipple 60 and the outer wall of the valve core 10 are fixedly connected through threads, one end of the backup nipple 60 is attached to the valve upper joint 50, and one end of the valve body connecting piece 70 is fixedly connected with the valve body upper 20 through threads. One side of the backup nipple 60 is attached to the valve upper joint 50 and is threadedly connected with the valve core 10 inside the valve upper joint 50, and the additional fastening force provided by the thread connection prevents the key components from loosening under high-frequency vibration or high-pressure impact.

[0068] In the embodiment of the present application, the first end of the valve body 30 is connected to the valve body 20 by screwing, the second end of the valve body 30 is connected to the connecting pipe 80 by screwing, and the side of the valve body 30 is also provided with a tapping hole for a jackscrew, which is connected to the tapping hole by screwing, and a mesh is arranged between the jackscrew and the tapping hole for filtering. The valve body 30 is made of 45 steel, and the two ends of the valve body 30 are provided with threads for connecting the valve body 20 and the connecting pipe 80, respectively. The valve core passage B31 and the valve core passage A21 allow the valve core 10 to move axially to switch the high-pressure fluid passage, and the inner hole matched with the valve core 10 is biased downward. The valve body 30 is also provided with a water pressure switching passage and a seat sealing passage 34, which are biased to one side by the biasing design and are used for high-pressure water and packer inflation, respectively.

[0069] In the embodiment of the present application, the valve core passage B31 and the valve core passage A21 have the same inner diameter, the sealing ring A22 and the sealing ring B32 arranged in the valve core passage B31 and the valve core passage A21 have the same structure, and six O-shaped rubber sealing rings with a diameter of 30*2.65 are arranged to realize sealing with the outer wall of the valve core 10.

[0070] In the embodiment of the present application, the valve upper connector 50 is provided with a tapered notch at one end, the tapered notch is connected to a filter pipe 40, the valve upper connector 50 is provided with a tapered threaded hole which is in communication with the tapered notch, and a filter pipe passage 51 is arranged between the bottom of the tapered notch and the tapered threaded hole. One side of the valve upper connector 50 is connected to a drill rod by screwing, the filter pipe 40 is connected to the filter pipe passage 51 in the drill rod and the valve upper connector 50 to filter the high-pressure fluid in the drill rod, and the other side of the valve upper connector 50 is screwed to the valve core 10 to guide the high-pressure fluid filtered by the filter pipe 40 to the inside of the valve core 10. The position of the valve core 10 in the threaded connection is biased, and a slot is arranged in the middle of the valve upper connector 50 to ensure the flow transition caused by the biasing scheme on both sides to ensure the flow requirement. The filter pipe 40 can fully filter the high-pressure seal tape, impurities and rust on the inner wall of the drill rod which may be carried in the high-pressure fluid in the test, so as not to affect the smooth progress of the high-pressure water test.

[0071] In the embodiment of the present application, the valve body 20 is provided with a valve body middle connecting hole 24 and a connecting piece connecting hole 25 at the two ends, respectively, one end of the valve core passage A21 is in communication with the valve body middle connecting hole 24, and the other end of the valve core passage A21 is in communication with the connecting piece connecting hole 25, the valve body middle connecting hole 24 is sealingly connected to one end of the valve body 30, and the connecting piece connecting hole 25 is sealingly connected to the valve body connecting piece 70.

[0072] In a specific embodiment of the present invention, a connecting pipe interface 35 is provided at the second end of the valve body 30. The connecting pipe interface 35 communicates with the pressure water channel 33, and one end of the connecting pipe 80 is sealed and connected to the connecting pipe interface 35. The function of the connecting pipe 80 is to connect the valve body 30 and the packer connector 90, thereby leading the high-pressure fluid of the push-pull valve pressure water channel to the central rod inside the packer through the packer connector 90. The second end of the valve body 30 is also provided with a threaded hole for connecting the gap return oil pipe joint. The gap return oil pipe joint leads the high-pressure fluid of the sealing channel through an external rubber hose to the rubber sleeve of the packer to achieve packer expansion.

[0073] Specifically, such as Figures 6-7 As shown in the specific embodiment of the present invention, a shoulder positioning groove is provided on the inner side of the valve body connector 70, and a shoulder is provided at the junction of the nut connecting section 13 and the valve body connecting section 14 on the surface of the valve core 10. The valve core 10 is positioned by the shoulder positioning groove, and the outer side of the valve body connector 70 is connected to the upper valve body 20. The purpose of the design structure is to solve the installation conflict between the valve body shoulder positioning and the valve core 10 offset scheme. Thus, during assembly, the upper valve body 20 and the middle valve body 30 are first threaded together, then the valve core 10 is inserted into the inner holes of both for mating, and finally the valve body connector 70 is threaded together with the upper valve body 20 to achieve the shoulder positioning of the valve core 10, ensuring the normal switching between the seated position and the pressure water position of the valve core 10.

[0074] In a specific embodiment of the present invention, one end of the connecting pipe 80 is connected to a packer connector 90. The packer connector 90 has external threads on both sides, with the two external threads respectively connecting to the connecting pipe 80 and the packer. The packer connector 90 is hollow and has a pressure water channel. The connecting pipe 80 is threaded on both sides to connect the valve body 30 and the packer connector 90, with the inner hole serving as a pressure water channel to guide high-pressure fluid to the test section for high-pressure water pressure. The packer connector 90 connects the packer and the connecting pipe 80 on both sides and is assembled and tightened using a wrench. This structure is designed to allow direct connection to the center rod of the finished packer, avoiding conflicts caused by different push-pull valves and different packer connections. Furthermore, the packer connector 90 has a wrench attachment for easy assembly and clamping.

[0075] The shoulder positioning method, because the position of the shoulder positioning groove in the valve body connector 70 is fixed, cannot be adjusted when limiting the valve core 10; it can only limit the position of the shoulder of the valve core 10. This results in a single limiting function and poor adaptability to complex working environments. Therefore, the following is a specific implementation scheme for the high-pressure water offset push-pull valve of this application, with reference to the attached drawings:

[0076] Specifically, such as Figures 9-12As shown in the specific embodiment of the present application, a limiting sliding groove 71 is formed in the inner wall of the valve body connecting piece 70, a limiting sliding block 72 is slidably connected in the limiting sliding groove 71, a rotating ring 73 is rotatably connected to the outer surface of the valve body connecting piece 70, an inner thread is formed in the inner wall of the rotating ring 73, an axial shoulder sleeve 74 is slidably connected in the valve body connecting piece 70, and an outer thread is formed in the upper end of the limiting sliding block 72 and matched with the inner thread of the rotating ring 73.

[0077] In the specific embodiment of the present application, anti-skid lines are formed on the outer surface of the rotating ring 73, a prismatic body 703 is integrally formed on the outer surface of the valve body connecting piece 70, a clamping spring 701 is clamped on the surface of the valve body connecting piece 70, a limiting groove is formed between the clamping spring 701 and the prismatic body 703, and the rotating ring 73 is rotatably clamped in the limiting groove. The anti-skid lines on the outer surface of the rotating ring 73 increase the friction of the hands, and the prismatic body 703 on the outer surface of the valve body connecting piece 70 (which can be fixed by a wrench) enables the operator to easily and stably rotate the rotating ring 73, so as to finely adjust the position of the axial shoulder sleeve 74 and avoid the positioning deviation caused by slipping or uneven force during the adjustment process. The rotating ring 73 is limited in the fixed groove by the clamping spring 701 and the prismatic body 703, so as to ensure that it can only rotate around the valve body connecting piece 70 without axial movement, thereby ensuring the stability of the adjustment process and the consistency of the adjustment result.

[0078] When the valve core 10 is worn or needs to be replaced, the entire valve body connecting piece 70 does not need to be disassembled, and the axial shoulder sleeve 74 can be quickly adjusted to adapt to the new valve core 10 by only rotating the rotating ring 73, thereby simplifying the maintenance process, shortening the downtime, and reducing the maintenance cost. When the working condition parameters such as fluid pressure and flow change, the position of the axial shoulder sleeve 74 can be finely adjusted to optimize the matching state of the valve core 10 and the valve body, thereby improving the sealing effect, reducing the fluid resistance, or reducing the component wear, and prolonging the service life of the entire valve assembly. By rotating the rotating ring 73, the rotating ring 73 pushes the limiting sliding block 72 to slide during the rotation, so that the limiting sliding block 72 drives the axial shoulder sleeve 74 to slide along the inner wall of the valve body connecting piece 70, thereby facilitating the adjustment of the position of the axial shoulder positioning. The axial shoulder sleeve 74 can be adjusted for different use requirements or different specifications of the valve core 10, so as to adapt to more scene uses.

[0079] The valve core 10 slides in the valve body connecting piece 70 and collides with the axial shoulder sleeve 74. Long-time collision impact can damage the structure of the valve body connecting piece 70. Therefore, the following refers to the specific embodiment of the high-pressure water biasing push-pull valve according to the present application:

[0080] Specifically, as Figures 10-11As shown in the specific embodiment of the present application, the outer surface of the shaft shoulder sleeve 74 is fixed with a stop block 75, one side of the stop block 75 is connected with the limiting sliding block 72 through a damper 76, the other side of the stop block 75 is connected with the limiting sliding block 72 through a compression spring 77, the limiting sliding block 72 is hollowly provided with an accommodating groove, and the stop block 75 is slidingly clamped in the accommodating groove.

[0081] In the specific embodiment of the present application, the stop block 75 is fixed at the end of the shaft shoulder sleeve 74, the damper 76 and the compression spring 77 are arranged in the accommodating groove, and a limiting block 78 is fixed in the accommodating groove.

[0082] The end of the shaft shoulder sleeve 74 is connected with the limiting sliding block 72 through the fixed stop block 75, the damper 76 and the compression spring 77 arranged between the stop block 75 and the limiting sliding block 72 cooperate to achieve a good buffering and damping effect, offset the impact force of the valve core 10 in the sliding process, and prolong the service life of the parts; when the water hammer effect or pressure pulse occurs in the fluid system, the buffer system composed of the damper 76 and the compression spring 77 can quickly absorb energy, inhibit the excessive vibration of the valve core 10, avoid the valve core 10 from deviating from the normal working position due to instantaneous impact force, and ensure the stability of flow and pressure control; the buffer structure reduces the hard collision of the valve core 10 and the valve seat, reduces the wear rate of the key components, reduces the number of shutdown maintenance due to damage of the parts, and improves the continuous operation time of the equipment.

[0083] The vibration caused by the impact of the valve core 10 may cause fluid turbulence, increase the flow resistance and produce noise. The buffer structure can reduce the pressure fluctuation and vortex formation in the flow channel by stabilizing the movement of the valve core 10, improve the fluid conveying efficiency and reduce noise pollution; with the increase of the use time, the wear of the sealing surface will cause the increase of the fitting gap, which may cause looseness. The pre-tightening force of the compression spring 77 can dynamically compensate for this gap change, so that the valve core 10 always maintains good contact with the sealing surface, prolonging the effective service life of the sealing assembly.

[0084] In the specific embodiment of the present application, two stop blocks 75 are symmetrically arranged, the limiting sliding block 72 is arranged in one-to-one correspondence with the stop block 75, and the outer thread grooves opened on the outer surfaces of the two limiting sliding blocks 72 are the same outer thread.

[0085] Seat sealing operation: as Figure 13 As shown, during the process of lowering the drill pipe, when the valve core 10 moves axially in the inner cavity of the valve core passage B31 to the top end of the valve body 30, the high-pressure water flow in the valve upper connector 50 flows out from the water outlet hole 11 of the valve core 10 after being filtered by the filter pipe 40, enters the seat sealing water channel through the water outlet groove formed by the valve core 10 and the valve body 30, enters the upper and lower separators through the gap oil return pipe connector and the external rubber hose, and makes the packer expand and adhere to the borehole wall under pressure.

[0086] Water pressure operation: such as Figure 14 As shown, after the sealing operation is completed, high-pressure water pressure is initiated. High-pressure water flows through the drill rod, is filtered by the filter pipe 40, and then enters the valve core 10 of the push-pull valve. At this time, the valve core 10 moves axially to the bottom end within the valve body 30. Water flows through the outlet hole 11 of the valve core 10, through the inlet of the valve body 30, into the pressure water channel. Finally, water flows from the outlet channel of the valve body 30 into the connecting pipe 80, the packer connector 90, and the central pipe of the packer, reaching the test section and being directionally delivered to the target section aperture to complete the high-pressure water pressure operation. In the prior art, the pressure water operation requires pushing the valve core 10 completely to the bottom end of the valve, meaning that the valve core 10 and the pressure water channel have one and only one very precise connection position.

[0087] It should be pointed out that, from Figure 13 It can be clearly seen that during the seat operation of the push-pull valve, high-pressure water flows through the seat water channel into the separator, while Figure 15 and Figure 16 During high-pressure water injection operation, high-pressure water flows into the open-hole borehole of the test section through three water injection channels. The water in the two channels is spatially isolated and independent, without interfering with each other. It should also be noted that during the axial movement of the valve core 10, multiple sealing rings A22 and B32 exist between the valve core 10 and the valve body 30. This ensures that the high-pressure water flows into only one channel at each location, and also guarantees the packer pressure and the pressure in the test section during the setting stage.

[0088] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A high pressure water pressure biased push-pull valve characterized by, include The valve core (10) has a valve connector (50) connected to its first end. The valve core (10) is hollow and has a central hole (15). The valve core (10) has a water outlet hole (11) on its second end side wall. On the valve body (20), a valve core channel A (21) is provided along the length direction. The valve core channel A (21) is eccentrically set inside the valve body (20). A sealing groove A is provided inside the valve core channel A (21). A sealing ring A (22) is snapped into the sealing groove A. The second end of the valve core (10) is connected and inserted into the valve core channel A (21). The outer surface of the valve core (10) is in sealing contact with the sealing ring A (22). A set screw hole (23) is provided on the side wall of the valve core channel A (21). A set screw is threaded inside the set screw hole (23). A mesh for filtering is placed between the set screw and the threaded hole. In the valve body (30), the first end of the valve body (30) is threadedly fixed to the valve body (20). The first end of the valve body (30) is provided with a valve core channel B (31) along the axial direction. The valve core channel B (31) is also eccentrically arranged in the valve body (30). The inner wall of the valve core channel B (31) is provided with a sealing groove B. A sealing ring B (32) is snapped in the sealing groove B. The valve core channel B (31) is connected to the valve core channel A (21). The second end of the valve body (30) is connected with a connecting pipe (80). The valve body (30) is provided with an offset water pressure channel (33) and a seat seal channel (34) along the length direction. The valve core (10) is provided with a spare nut connection section (13) and a valve body connection section (14). A spare nut (60) is installed at the spare nut connection section (13), and a valve body connector (70) is installed at the valve body connection section (14). The inner wall of the spare nut (60) is fixed to the outer wall of the valve core (10) by a threaded connection. One end of the spare nut (60) is attached to the valve upper connector (50), and one end of the valve body connector (70) is fixed to the valve body upper connector (20) by a threaded connection. The valve body connector (70) has a limiting groove (71) on its inner wall. A limiting slider (72) is slidably engaged in the limiting groove (71). A rotating ring (73) is rotatably sleeved on the outer surface of the valve body connector (70). An internal thread is provided on the inner wall of the rotating ring (73). A shoulder sleeve (74) is slidably inserted into the valve body connector (70). The lower end of the limiting slider (72) is connected to the surface of the shoulder sleeve (74). An external thread that engages with the internal thread is provided on the upper end of the limiting slider (72). Anti-slip texture is provided on the outer surface of the rotating ring (73). A prism (703) is integrally formed on the outer surface of the valve body connector (70). A retaining spring (701) is engaged on the surface of the valve body connector (70). A limiting groove is formed between the retaining spring (701) and the prism (703). The rotating ring (73) is rotatably engaged in the limiting groove.

2. The high-pressure water offset push-pull valve according to claim 1, characterized in that, One end of the valve connector (50) is provided with a conical threaded hole, and the first end of the valve core (10) is provided with a threaded groove A. The threaded groove A is connected to the conical threaded hole in conjunction with the sealing thread. The second end of the valve core (10) moves axially inside the valve core channel A (21) and the valve core channel B (31) to realize the switching between the water pressure channel and the seat seal channel (34).

3. The high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, A plug (12) is connected to the second end of the valve core (10), and multiple outlet holes (11) are provided along the circumference of the valve core (10).

4. A high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, The first end of the valve body (30) is connected to the valve body (20) by a thread, and the second end of the valve body (30) is connected to the connecting pipe (80) by a thread. The valve body (30) also has a set screw hole on its side, which is threaded to the set screw. A mesh that plays a filtering role is placed between the set screw and the threaded hole.

5. A high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, The valve core channel B (31) has the same inner diameter as the valve core channel A (21), and the sealing ring A (22) provided inside it has the same structure as the sealing ring B (32); One end of the valve connector (50) is provided with a conical groove, which is connected to a filter tube (40). The valve connector (50) is provided with a conical threaded hole that communicates with the conical groove. A filter tube channel (51) is provided between the bottom of the conical groove and the conical threaded hole.

6. A high-pressure water pressure biasing push-pull valve according to claim 1, characterized in that, The valve body (20) has a valve body interface (24) and a connector interface (25) at both ends. One end of the valve core channel A (21) is connected to the valve body interface (24), and the other end of the valve core channel A (21) is connected to the connector interface (25). The valve body interface (24) is sealed and connected to one end of the valve body (30), and the connector interface (25) is sealed and connected to the valve body connector (70).

7. A high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, The valve body (30) has a connecting pipe interface (35) at the second end. The connecting pipe interface (35) is connected to the water pressure channel (33). One end of the connecting pipe (80) is sealed and connected to the connecting pipe interface (35).

8. A high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, The inner side of the valve body connector (70) is provided with a shoulder positioning groove. The valve core (10) surface is provided with a shoulder at the junction of the female connecting section (13) and the valve body connecting section (14). The valve core (10) is positioned by the shoulder positioning groove. The outer side of the valve body connector (70) is threaded to the valve body (20).

9. A high-pressure water pressure offset push-pull valve according to claim 1, characterized in that, One end of the connecting pipe (80) is connected to a packer connector (90). The packer connector (90) has external threads on both sides. The two external threads are connected to the connecting pipe (80) and the packer, respectively. The packer connector (90) is hollow and has a water pressure channel.

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