Arrow-shaped controllable pressure regulating valve

Abstract

The arrow-shaped controllable pressure regulating valve comprises a body and a barrel arranged in the body, and a sliding supporting pipe is arranged in the middle of the barrel; the arrow-shaped valve element is arranged on the cylinder body in a sliding mode, and the arrow-shaped valve element is arranged on the sliding supporting pipe in a sliding mode; a first channel is formed between the arrow-shaped valve element and the body, and the arrow-shaped valve element is further provided with a second channel. When the arrow-shaped valve element is located at the first position, the first channel is opened, and fluid in the body flows through the first channel and the second channel. When the arrow-shaped valve element is located at the second position, the first channel is closed, and fluid in the body flows through the second channel.

Description

TECHNICAL FIELD

[0001] The present application relates to an arrow-shaped controllable pressure regulating valve, belonging to the field of oil drilling, and is particularly used for adjusting and enhancing the function of downhole tools. BACKGROUND

[0002] In the downhole tools used in oil drilling operations, such as some types of variable-diameter stabilizers, the tools need to use the pressure difference between the inside and outside of the drill string as power to drive the piston. When the drilling assembly is determined to be incorporated into the well, due to the difficulty of changing the parameters such as drilling fluid discharge and density in a large range, the pressure difference between the inside and outside of the drill string at the tool position is relatively fixed, and the adjustment range is small, thus limiting the performance of the downhole tool driven by the pressure difference between the inside and outside.

[0003] At present, the pressure difference between the inside and outside of the downhole tool is mainly generated by the drill bit, screw drill and MWD tools, and can only be adjusted by the discharge, but the adjustable range of the discharge is small during drilling, so the adjustment function of the pressure difference between the inside and outside of the downhole drill string is weak.

[0004] The Chinese patent document "Intelligent downhole throttling valve for adjustable production of gas well CN202020852324.9" transmits instructions by adjusting the wellhead pressure, which can be applied in the production process of gas wells. However, frequent switching of the pump during drilling and frequent changes in downhole pressure will cause disorder of the downhole adjustment structure command, so the pressure adjustment-based method is not suitable for the drilling process.

[0005] The Chinese patent document "Downhole throttling valve, deepwater gas well testing system and testing method CN104343416B" connects the ground and the downhole throttling valve through a hydraulic pipeline of thousands of meters, and controls the throttling valve through the hydraulic pipeline. During the drilling process, the drill string needs to be continuously increased to continue drilling, and the length of the drill string is changing, so the hydraulic pipeline for control cannot be installed. SUMMARY

[0006] In view of the above technical problems existing in the prior art, the present application provides an arrow-shaped controllable pressure regulating valve, which can drive the arrow-shaped valve core to close the first passage by increasing the discharge of the drilling fluid, so that the drilling fluid can only pass through the second passage, thereby generating a larger pressure regulating effect and maintaining the pressure regulating state within a wider range of drilling fluid discharge.

[0007] The present application provides an arrow-shaped controllable pressure regulating valve, comprising:

[0008] a body,

[0009] a cylinder arranged in the body, a middle part of the cylinder being provided with a sliding support pipe; and

[0010] an arrow-shaped valve core slidingly arranged on the cylinder, the arrow-shaped valve core being slidingly arranged on the sliding support pipe;

[0011] The first channel is formed between the arrow-shaped valve core and the body, and the second channel is further arranged on the arrow-shaped valve core.

[0012] The first channel is opened when the arrow-shaped valve core is in the first position, and the fluid in the body flows through the first channel and the second channel.

[0013] The arrow-shaped valve core is in the first position at the beginning, and is moved from the first position to the second position when the flow of the drilling fluid in the body is increased, and the first channel is closed.

[0014] The arrow-shaped valve core comprises a valve core head, and a shaft is arranged at the rear end of the valve core head.

[0015] The shaft is slidably arranged in the sliding support pipe, and the second channel is arranged on the valve core head.

[0016] The second channel comprises a plurality of holes arranged along the axial direction of the valve core head and uniformly arranged along the circumferential direction of the valve core head.

[0017] The front end of the valve core head is in the shape of an arrow or a cone, and the rear end is provided with a stepped structure.

[0018] The outer side of the shaft is provided with a spring, one end of the spring is limited on the stepped structure, and the other end is limited on the sliding support pipe.

[0019] When the arrow-shaped valve core is in the first position, the spring is in an elongated state, and when the arrow-shaped valve core is in the second position, the spring is in a compressed state.

[0020] The upper edge of the cylinder body is provided with a first bevel, and the lower side of the edge of the valve core head is provided with a second bevel, and when the arrow-shaped valve core is in the second position, the first bevel is connected with the second bevel.

[0021] The end of the shaft is provided with a thread, and the shaft is located on one side of the lower end of the sliding support pipe and provided with a locking nut, the locking nut can adjust the position of the spring on the shaft through the thread, so as to adjust the compression degree of the spring.

[0022] The cylinder body and the sliding support pipe are connected through a connecting rod or a connecting sheet.

[0023] Further improvement of the present application is that the upper end of the body is provided with a drill rod female buckle, and the lower end is provided with a drill rod male buckle; the inside of the body is provided with a mounting step, and the barrel is arranged on the mounting step.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The arrow-shaped controllable pressure regulating valve according to the present application can drive the arrow-shaped valve core to close the first channel by increasing the drilling fluid discharge, the drilling fluid can only pass through the second channel, thereby generating a larger pressure regulating effect, and maintaining the pressure regulating state within a wider range of drilling fluid discharge. The present application realizes the adjustment function of the downhole pressure difference driving type tool on the ground, thereby expanding the function of the downhole pressure difference driving type tool, optimizing its performance, and being more suitable for complex downhole conditions. When the drilling fluid discharge is reduced to a certain value, the arrow-shaped valve opens the first channel under the action of the spring, and normal circulation is restored. BRIEF DESCRIPTION OF DRAWINGS

[0026] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0027] Figure 1 Fig. 1 is a structural schematic diagram of an arrow-shaped controllable pressure regulating valve according to an embodiment of the present application;

[0028] Figure 2 Fig. 2 is an A-A sectional view of Fig. 1; Figure 1

[0029] Figure 3 Fig. 3 is a B-B sectional view of Fig. 1; Figure 1

[0030] The accompanying drawings are not drawn according to the actual scale.

[0031] The meanings of the reference signs in the accompanying drawings are as follows:

[0032] 1, body, 2, barrel, 3, arrow-shaped valve core, 11, mounting step, 12, drill rod female buckle, 13, drill rod male buckle, 21, sliding support pipe, 22, connecting rod or connecting plate, 23, first bevel, 31, valve core head, 32, core shaft, 33, spring, 34, first channel, 35, second channel, 36, step structure, 37, locking nut. DETAILED DESCRIPTION

[0033] In order to make the technical solutions and advantages of the present application clearer, the exemplary embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not an exhaustive enumeration of all embodiments. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.​​

[0034] In downhole tools used in oil drilling operations, such as some types of variable gauge stabilizers, a piston is driven by the pressure difference between the inside and outside of the drill string. When the drill assembly is incorporated into the well, the inside and outside pressure difference at the location of the tool in the drill string is relatively fixed and has a small adjustment range due to the difficulty of changing the drilling fluid flow rate, density and other parameters, thus limiting the performance of the inside and outside pressure difference driven downhole tool.

[0035] Currently, the inside and outside pressure difference of the downhole tool is mainly generated by the drill bit, screw drill and MWD tools, and can only be adjusted by the flow rate, but the flow rate adjustment range is small during drilling, so the downhole drill string pressure difference adjustment function is weak.

[0036] To solve the above problems, the present application provides an arrow-shaped controllable pressure regulating valve, which can drive the arrow-shaped valve core to close the first passage by increasing the drilling fluid flow rate, so that the drilling fluid can only flow through the second passage, thereby generating a larger pressure regulating effect and maintaining the pressure regulating state within a wider range of drilling fluid flow rate. The adjustment function of the downhole pressure difference driven tool on the ground is realized, thereby expanding the function of the downhole pressure difference driven tool, optimizing its performance, and better adapting to complex downhole conditions. When the drilling fluid flow rate is reduced to a certain value, the arrow-shaped valve opens the first passage under the action of the spring, and the normal circulation is restored.

[0037] In the embodiment as shown in Figure 1 An arrow-shaped controllable pressure regulating valve comprises:

[0038] A body 1 is a cylindrical or tubular structure, the upper end of which is connected to the upper drill pipe, and the lower end is connected to the lower drill pipe.

[0039] A cylinder 2 is arranged in the body 1, which is also a cylindrical structure, and the cylinder 2 is sleeved in the inside of the body 1, and the outer wall of the cylinder 2 matches the size of the inner wall of the body 1.

[0040] An arrow-shaped valve core 3 is further arranged in the inside of the body 1, which is connected to the cylinder 2 and can slide on the cylinder 2.

[0041] The arrow-shaped valve core 3 is slidably arranged on the sliding support pipe 21.

[0042] The arrow-shaped valve core 3 and the body 1 form a first passage 34, and the arrow-shaped valve core 3 is further provided with a second passage 35.

[0043] When the arrow-shaped valve core 3 is in the first position, the first passage 34 is open, and the fluid in the body 1 flows through the first passage 34 and the second passage 35; when the arrow-shaped valve core 3 is in the second position, the first passage 34 is closed, and the fluid in the body 1 flows through the second passage 35.

[0044] In the arrow-shaped controllable pressure regulating valve according to the embodiment, the first passage 34 is an annular passage between the arrow-shaped valve core 3 and the body 1, which can be opened and closed. When the arrow-shaped valve core 3 is arranged at the first position, the annular passage is in an open state; when the arrow-shaped valve core 3 is arranged at the second position, the annular passage is in a closed state. The position of the arrow-shaped valve core 3 can be controlled by the flow rate of the fluid in the body 1.

[0045] In one embodiment, initially, the arrow-shaped valve core 3 is at the first position; when the flow rate of the drilling fluid in the body 1 increases, the arrow-shaped valve core 3 moves from the first position to the second position and closes the first passage 34; when the flow rate of the drilling fluid in the body 1 decreases to a certain value, the arrow-shaped valve core 3 moves from the second position to the first position.

[0046] In the arrow-shaped controllable pressure regulating valve according to the embodiment, when the flow rate of the drilling fluid in the body 1 exceeds a certain value Q0, the fluid flows through the arrow-shaped valve core 3, driving the arrow-shaped valve core 3 to move downward until it is seated on the barrel 2, thereby closing the first passage 34, leaving only the second passage 35 arranged on the arrow-shaped valve core 3 open, so that the fluid can only flow through the second passage 35, generating a large pressure regulating effect.

[0047] Due to the remaining second passage 35, a large pressure is generated, and even if the drilling fluid discharge is lower than Q0, the arrow-shaped valve core 3 will not rebound, maintaining the pressure effect in a large range of drilling fluid, and when the drilling fluid discharge decreases to Q1, the arrow-shaped valve core 3 rebounds to reopen the first passage 34, and the pressure effect disappears.

[0048] In one embodiment, the arrow-shaped valve core 3 includes two parts, namely the valve core head 31 located at the upper part and the core shaft 32 located at the lower part. If the direction toward which the fluid flows in is regarded as the front end, the core shaft 32 is arranged at the rear end of the valve core head 31.

[0049] The core shaft 32 is slidably arranged in the sliding support pipe 21, and the second passage 35 is arranged on the valve core head 31.

[0050] The width of the valve core head 31 is large, and the diameter of the core shaft 32 is small. The outer diameter of the core shaft 32 matches the inner diameter of the sliding support pipe 21, and the core shaft 32 can be inserted into the sliding support pipe 21, and the valve core head 31 and the core shaft 32 form an arrow-shaped structure.

[0051] In one embodiment, the second passage 35 includes a plurality of holes, which are arranged along the axial direction of the valve core head 31 and uniformly arranged along the circumferential direction of the valve core head 31.

[0052] In the arrow-shaped controllable pressure regulating valve according to the embodiment, the center shaft of the valve core shaft 32 needs to be connected with the lower core shaft 32, and in order to ensure the uniform arrangement of the holes, the holes are arranged on the valve core head 31 around the center shaft of the valve core head 31.

[0053] In one embodiment, the front end of the valve core head 31 is arrow-shaped or conical, which can be uniform or non-uniform.

[0054] In one embodiment, the outer side of the core shaft 32 is provided with a spring 33, one end of which is limited on the step structure 36, and the other end is limited on the sliding support pipe 21.

[0055] When the arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state; when the arrow-shaped valve core 3 is in the second position, the spring 33 is in the compressed state.

[0056] In the use of the arrow-shaped controllable pressure regulating valve according to the embodiment, the arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state, and the arrow-shaped valve core 3 is supported in the first position, at this time, the first channel 34 and the second channel 35 are both in the open state, and the drilling fluid in the body 1 can flow through the first channel 34 and the second channel 35.

[0057] When the flow of the drilling fluid in the body 1 increases, the pressure of the internal fluid also increases, at this time, under the driving action of the pressure of the drilling fluid, the arrow-shaped valve core 3 moves downward and compresses the spring 33. When the flow and pressure of the drilling fluid increase to a certain value, for example, to Q0, the fluid drives the arrow-shaped valve core 3 to completely overcome the elastic force of the spring 33, and the spring 33 is compressed, so as to move to the second position. After reaching the second position, the first channel 34 is blocked by the upper end of the cylinder 2, so that the arrow-shaped valve core 3 is seated on the cylinder 2, and the drilling fluid in the body 1 can only flow in the second channel 35, and the flow of the drilling fluid will instantaneously decrease, thereby generating a large pressure regulating effect, i.e. upper pressure holding.

[0058] Due to the decrease of the flow of the drilling fluid and the upper pressure holding, the arrow-shaped valve core 3 will be in the second position under the action of the pressure, and even if the displacement of the drilling fluid drops to Q0, the arrow-shaped valve core 3 will not return to the first position. When the displacement of the drilling fluid continues to drop to a certain value, the arrow-shaped valve core 3 will return under the action of the elastic force of the spring 33 and move to the first position.

[0059] Thus, when the arrow-shaped controllable pressure regulating valve according to the present embodiment is used, the flow and pressure below can be controlled by the arrow-shaped controllable pressure regulating valve as long as the pressure of the drilling fluid is increased, and when the drilling fluid discharge at the wellhead is restored to the original state, the flow and pressure below can also be kept in a small state, and it is not necessary to keep the drilling fluid discharge or pressure at the wellhead all the time.

[0060] When it is necessary to restore the flow and pressure below, the drilling fluid discharge at the wellhead is further reduced, and the arrow-shaped valve core 3 is restored to the first position to open the first passage 34.

[0061] In one embodiment, the upper edge of the barrel 2 is provided with a first bevel 23, and the lower side of the edge of the valve core head 31 is provided with a second bevel, and the first bevel 23 and the second bevel are in contact when the arrow-shaped valve core 3 is in the second position.

[0062] In the present embodiment, the first bevel 23 and the second bevel have the same inclination angle, and the first bevel 23 and the second bevel can be fitted to ensure the sealing.

[0063] In one embodiment, the end of the core shaft 32 is provided with a thread, and the core shaft 32 is provided with a locking nut 37 on one side of the lower end of the sliding support pipe 21, and the locking nut 37 can adjust the position of the core shaft 32 through the thread to adjust the compression degree of the spring 33.

[0064] The barrel 2 and the sliding support pipe 21 are connected through a connecting rod or a connecting sheet 22.

[0065] The upper end of the body 1 is provided with a drill rod female coupling 12, and the lower end is provided with a drill rod male coupling 13; the inside of the body 1 is provided with a mounting step 11, and the barrel 2 is arranged on the mounting step 11.

[0066] The following will be described in conjunction with specific embodiments.

[0067] Embodiment 1

[0068] An arrow-shaped controllable pressure regulating valve, comprising:

[0069] A body 1, which is a cylindrical or tubular structure, and the upper end of the body 1 is connected to an upper drill rod, and the lower end of the body 1 is connected to a lower drill rod.

[0070] A barrel 2 is arranged in the body 1, and the barrel 2 is also a cylindrical structure, and the barrel 2 is arranged in the body 1, and the outer wall of the barrel 2 and the inner wall of the body 1 are matched in size.

[0071] The inside of the body 1 is further provided with an arrow-shaped valve core 3, and the arrow-shaped valve core 3 is connected to the barrel 2 and can slide on the barrel 2.

[0072] The arrow-shaped valve core 3 is slidingly arranged on the sliding support pipe 21.

[0073] The arrow-shaped valve core 3 and the body 1 form a first channel 34, and the arrow-shaped valve core 3 is further provided with a second channel 35.

[0074] When the arrow-shaped valve core 3 is in the first position, the first channel 34 is open, and the fluid in the body 1 flows through the first channel 34 and the second channel 35; when the arrow-shaped valve core 3 is in the second position, the first channel 34 is closed, and the fluid in the body 1 flows through the second channel 35.

[0075] The first channel 34 is an annular channel between the arrow-shaped valve core 3 and the body 1, which can be opened and closed; when the arrow-shaped valve core 3 is arranged in the first position, the annular channel is in an open state; when the arrow-shaped valve core 3 is arranged in the second position, the annular channel is in a closed state. The position of the arrow-shaped valve core 3 can be controlled by the flow of the fluid in the body 1.

[0076] In the initial state, the arrow-shaped valve core 3 is in the first position; when the flow of the drilling fluid in the body 1 increases, the arrow-shaped valve core 3 moves from the first position to the second position and closes the first channel 34; when the flow of the drilling fluid in the body 1 decreases to a certain value, the arrow-shaped valve core 3 moves from the second position to the first position.

[0077] The arrow-shaped valve core 3 comprises two parts, namely a valve core head 31 arranged at the upper part and a core shaft 32 arranged at the lower part. If the direction towards which the fluid flows is regarded as the front end, the core shaft 32 is arranged at the rear end of the valve core head 31.

[0078] The core shaft 32 is slidingly arranged in the sliding support pipe 21, and the second channel 35 is arranged on the valve core head 31.

[0079] The width of the valve core head 31 is larger, and the diameter of the core shaft 32 is smaller; the outer diameter of the core shaft 32 matches the inner diameter of the sliding support pipe 21, so that the core shaft 32 can be inserted into the sliding support pipe 21, and the valve core head 31 and the core shaft 32 form an arrow-shaped structure.

[0080] The second channel 35 comprises a plurality of holes, which are arranged along the axial direction of the valve core head 31 and uniformly arranged along the circumferential direction of the valve core head 31.

[0081] In the arrow-shaped controllable pressure regulating valve according to the embodiment, the central axis of the valve core shaft 32 needs to be connected to the lower core shaft 32, and in order to ensure that the holes are uniformly arranged, the holes are arranged on the valve core head 31 and arranged around the central axis of the valve core head 31.

[0082] The front end of the valve core head 31 is arrow-shaped or conical, and the arrow shape can be uniform taper or non-uniform sharp head. The rear end of the valve core head 31 is provided with a stepped structure 36, which can be the transition position of the valve core head 31 and the core shaft 32 with a larger outer diameter.

[0083] The outer side of the core shaft 32 is provided with a spring 33, one end of which is defined on the stepped structure 36, and the other end is defined on the sliding support pipe 21.

[0084] When the arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state; when the arrow-shaped valve core 3 is in the second position, the spring 33 is in the compressed state.

[0085] The arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state, supporting the arrow-shaped valve core 3 in the first position, at this time the first channel 34 and the second channel 35 are both in the open state, and the drilling fluid in the body 1 can flow through the first channel 34 and the second channel 35.

[0086] The upper edge of the barrel 2 is provided with a first bevel 23, and the lower side of the edge of the valve core head 31 is provided with a second bevel, when the arrow-shaped valve core 3 is in the second position, the first bevel 23 is in contact with the second bevel.

[0087] The inclination angles of the first bevel 23 and the second bevel are the same, and the first bevel 23 and the second bevel can be fitted to ensure the sealing property.

[0088] The end of the core shaft 32 is provided with a thread, and the core shaft 32 is located on one side of the lower end of the sliding support pipe 21 and is provided with a locking nut 37, the locking nut 37 can adjust its position on the core shaft 32 through the thread, so as to adjust the compression degree of the spring 33.

[0089] The barrel 2 and the sliding support pipe 21 are connected through a connecting rod.

[0090] The upper end of the body 1 is provided with a drill rod female buckle 12, and the lower end is provided with a drill rod male buckle 13; the inside of the body 1 is provided with a mounting step 11, and the barrel 2 is arranged on the mounting step 11.

[0091] When the flow rate of the drilling fluid in the body 1 increases, the pressure of the internal fluid will also increase. At this time, under the push of the drilling fluid pressure, the arrow-shaped valve core 3 will move downward and compress the spring 33. When the flow rate and pressure of the drilling fluid increase to a certain value, for example, when it reaches 27 MPa, the fluid drives the arrow-shaped valve core 3 to completely overcome the elastic force of the spring 33, compressing the spring 33 and moving it to the second position. After reaching the second position, the first channel 34 will be blocked by the upper end of the cylinder 2, so that the arrow-shaped valve core 3 is seated on the cylinder 2. The drilling fluid in the body 1 can only flow in the second channel 35. The flow rate of the drilling fluid will be reduced instantly, thereby producing a large pressure regulation effect and holding up the pressure at the top.

[0092] As the flow rate of drilling fluid decreases and pressure builds up above, the arrow-shaped valve core 3 will be in the second position under the action of pressure. Even if the displacement of drilling fluid drops to 27 MPa, the arrow-shaped valve core 3 will not return to the first position. When the displacement of drilling fluid continues to drop to 11 MPa, the arrow-shaped valve core 3 will retreat under the elastic force of spring 33 and move to the first position.

[0093] In this way, when using the arrow-shaped controllable pressure-regulating valve described in this embodiment, as long as the pressure of the drilling fluid is increased, the flow and pressure below can be controlled by the arrow-shaped controllable pressure-regulating valve, and when the drilling fluid displacement at the wellhead returns to its original state, the flow and pressure below will continue to remain at a smaller state, and there is no need to always maintain the drilling fluid displacement or pressure at the wellhead.

[0094] When the flow rate and pressure below need to be restored, the displacement of the wellhead drilling fluid is further reduced, and the arrow-shaped valve core 3 is restored to the first position to open the first channel 34.

[0095] Example 2

[0096] An arrow-shaped controllable pressure regulating valve, comprising:

[0097] The main body 1 is a cylindrical or tubular structure, with its upper end connected to the upper drill rod and its lower end connected to the lower drill rod.

[0098] A cylinder 2 is provided inside the main body 1 . The cylinder 2 is also a cylindrical structure. The cylinder 2 is sleeved inside the main body 1 . The outer wall of the cylinder 2 matches the size of the inner wall of the main body 1 .

[0099] An arrow-shaped valve core 3 is further provided inside the main body 1 . The arrow-shaped valve core 3 is connected to the cylinder 2 and can slide on the cylinder 2 .

[0100] The arrow-shaped valve core 3 is slidably disposed on the sliding support tube 21 .

[0101] The first channel 34 is formed between the arrow-shaped valve core 3 and the body 1, and the second channel 35 is formed on the arrow-shaped valve core 3.

[0102] When the arrow-shaped valve core 3 is in the first position, the first channel 34 is open, and the fluid in the body 1 flows through the first channel 34 and the second channel 35; when the arrow-shaped valve core 3 is in the second position, the first channel 34 is closed, and the fluid in the body 1 flows through the second channel 35.

[0103] The first channel 34 is an annular channel between the arrow-shaped valve core 3 and the body 1, which can be opened and closed. When the arrow-shaped valve core 3 is in the first position, the annular channel is in an open state; when the arrow-shaped valve core 3 is in the second position, the annular channel is in a closed state. The position of the arrow-shaped valve core 3 can be controlled by the flow of the fluid in the body 1.

[0104] At the beginning, the arrow-shaped valve core 3 is in the first position; when the flow of the drilling fluid in the body 1 increases, the arrow-shaped valve core 3 moves from the first position to the second position and closes the first channel 34; when the flow of the drilling fluid in the body 1 decreases to a certain value, the arrow-shaped valve core 3 moves from the second position to the first position.

[0105] The arrow-shaped valve core 3 includes two parts, namely the valve core head 31 located at the upper part and the core shaft 32 located at the lower part. If the direction of the fluid flow is regarded as the front end, the core shaft 32 is arranged at the rear end of the valve core head 31.

[0106] The core shaft 32 is slidably arranged in the sliding support pipe 21, and the second channel 35 is arranged on the valve core head 31.

[0107] The width of the valve core head 31 is larger, and the diameter of the core shaft 32 is smaller. The outer diameter of the core shaft 32 matches the inner diameter of the sliding support pipe 21, and the core shaft 32 can be inserted into the sliding support pipe 21. The valve core head 31 and the core shaft 32 form an arrow-shaped structure.

[0108] The second channel 35 includes a plurality of holes, which are arranged along the axial direction of the valve core head 31 and uniformly arranged along the circumferential direction of the valve core head 31.

[0109] In the arrow-shaped controllable pressure regulating valve according to the embodiment, the central axis of the valve core shaft 32 needs to be connected to the lower core shaft 32, and in order to ensure uniform arrangement of the holes, the holes are arranged on the valve core head 31 and arranged around the central axis of the valve core head 31.

[0110] The front end of the valve core head 31 is arrow-shaped or conical, which can be uniform or non-uniform. The rear end of the valve core head 31 is provided with a stepped structure 36, which can be the transition position of the valve core head 31 and the core shaft 32 with a larger outer diameter.

[0111] The outer side of the mandrel 32 is provided with a spring 33, one end of which is defined on the step structure 36 and the other end is defined on the sliding support pipe 21;

[0112] When the arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state; when the arrow-shaped valve core 3 is in the second position, the spring 33 is in the compressed state.

[0113] The arrow-shaped valve core 3 is in the first position, the spring 33 is in the elongated state, and the arrow-shaped valve core 3 is supported in the first position, at this time, the first channel 34 and the second channel 35 are both in the open state, and the drilling fluid in the body 1 can flow through the first channel 34 and the second channel 35.

[0114] The upper edge of the barrel 2 is provided with a first bevel 23, and the lower side of the edge of the valve core head 31 is provided with a second bevel, when the arrow-shaped valve core 3 is in the second position, the first bevel 23 is in contact with the second bevel.

[0115] The inclination angles of the first bevel 23 and the second bevel are the same, and the first bevel 23 and the second bevel can be fitted to ensure the sealing performance.

[0116] The end of the mandrel 32 is provided with a thread, and the side of the lower end of the sliding support pipe 21 is provided with a locking nut 37, which can adjust its position on the mandrel 32 through the thread, so as to adjust the compression degree of the spring 33.

[0117] The barrel 2 and the sliding support pipe 21 are connected through a connecting rod.

[0118] The upper end of the body 1 is provided with a drill rod female buckle 12, and the lower end is provided with a drill rod male buckle 13; the inside of the body 1 is provided with a mounting step 11, and the barrel 2 is arranged on the mounting step 11.

[0119] When the flow of the drilling fluid in the body 1 increases, the pressure of the internal fluid will also increase, at this time, under the driving action of the pressure of the drilling fluid, the arrow-shaped valve core 3 will move downward and compress the spring 33. When the flow and pressure of the drilling fluid increase to a certain value, for example, to 40Mpa, the fluid drives the arrow-shaped valve core 3 to completely overcome the elastic force of the spring 33, and the spring 33 is compressed, so as to move to the second position. After reaching the second position, the first channel 34 is blocked by the upper end of the barrel 2, so that the arrow-shaped valve core 3 is seated on the barrel 2, and the drilling fluid in the body 1 can only flow in the second channel 35, and the flow of the drilling fluid will instantaneously decrease, thereby generating a large pressure regulating effect, i.e. upper pressure accumulation.

[0120] When the flow of the drilling fluid is reduced, the pressure above is increased, the arrow-shaped valve core 3 will be in the second position under the action of the pressure, even if the flow of the drilling fluid is reduced to 40Mpa, the arrow-shaped valve core 3 will not return to the first position, when the flow of the drilling fluid continues to reduce to 20Mpa, the arrow-shaped valve core 3 will return under the elastic force of the spring 33 and move to the first position.

[0121] In this way, when the arrow-shaped controllable pressure regulating valve according to the embodiment is used, as long as the pressure of the drilling fluid is increased, the flow and pressure below can be controlled by the arrow-shaped controllable pressure regulating valve, and when the flow of the drilling fluid at the wellhead is restored to the original state, the flow and pressure below can also continue to be kept in a small state, without the need to always keep the flow or pressure of the drilling fluid at the wellhead.

[0122] When the flow and pressure below need to be restored, the flow of the drilling fluid at the wellhead is further reduced, and the arrow-shaped valve core 3 is restored to return to the first position to open the first channel 34.

[0123] It should be understood that the embodiments disclosed in the present application are not limited to the specific structure, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those skilled in the relevant art. It should also be understood that the terms used herein are for the purpose of describing specific embodiments only and are not meant to be limiting.

[0124] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0125] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0126] Certain terms are used throughout this specification to refer to specific system components. As those skilled in the art will appreciate, different names can often be used to refer to the same component, and thus this specification does not intend to distinguish between components that differ only in name, not function. References in this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout this specification do not necessarily refer to the same embodiment.

[0127] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

[0128] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made in accordance with the embodiments of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An arrow-shaped controllable pressure regulating valve, characterized by, The utility model relates to a kind of arrow-shaped valve core and body, including: Body (1), Cylinder (2) is arranged in the body (1), and the middle part of the cylinder (2) is provided with sliding support pipe (21);And Arrow-shaped valve core (3) is slidably arranged on the cylinder (2), and the arrow-shaped valve core (3) is slidably arranged on the sliding support pipe (21); Wherein, the first passage (34) is formed between the arrow-shaped valve core (3) and the body (1), and the second passage (35) is further provided on the arrow-shaped valve core (3); When the arrow-shaped valve core (3) is in the first position, the first passage (34) is opened, and the fluid in the body (1) flows through the first passage (34) and the second passage (35);When the arrow-shaped valve core (3) is in the second position, the first passage (34) is closed, and the fluid in the body (1) flows through the second passage (35).

2. The arrow-shaped controllable pressure regulating valve according to claim 1, characterized in that, At the beginning, the arrow-shaped valve core (3) is in the first position, when the flow of drilling fluid in the body (1) increases, the arrow-shaped valve core (3) moves from the first position to the second position, and the first passage (34) is closed;When the flow of drilling fluid in the body (1) decreases to a certain value, the arrow-shaped valve core (3) moves from the second position to the first position.

3. The arrow-shaped controllable pressure regulating valve according to claim 2, characterized in that, The arrow-shaped valve core (3) includes valve core head (31), and the rear end of the valve core head (31) is provided with shaft (32); The shaft (32) is slidably arranged in the sliding support pipe (21), and the second passage (35) is arranged on the valve core head (31).

4. The arrow-shaped controllable pressure regulating valve according to claim 3, characterized in that, The second passage (35) includes a plurality of holes, which are arranged along the axial direction of the valve core head (31) and uniformly arranged along the circumferential direction of the valve core head (31).

5. The arrow-shaped controllable pressure regulating valve according to claim 4, characterized in that The front end of the valve core head (31) is arrow-shaped or conical, and the rear end is provided with a stepped structure (36).

6. The arrow-shaped controllable pressure regulating valve according to claim 5, characterized in that The outer side of the shaft (32) is provided with a spring (33), one end of the spring (33) is limited on the stepped structure (36), and the other end is limited on the sliding support pipe (21); When the arrow-shaped valve core (3) is in the first position, the spring (33) is in the elongated state;When the arrow-shaped valve core (3) is in the second position, the spring (33) is in the compressed state.

7. The arrow-shaped controllable pressure regulating valve according to claim 6, characterized in that The upper edge of the cylinder (2) is provided with a first bevel (23), and the lower side of the edge of the valve core head (31) is provided with a second bevel, when the arrow-shaped valve core (3) is in the second position, the first bevel (23) is connected with the second bevel.

8. The arrow-shaped controllable pressure regulating valve according to claim 7, characterized in that, The end of the shaft (32) is provided with a thread, and the lock nut (37) is arranged on one side of the lower end of the sliding support pipe (21), and the position of the lock nut (37) on the shaft (32) can be adjusted through the thread, so as to adjust the compression degree of the spring (33).

9. The arrow-shaped controllable pressure regulating valve according to claim 8, characterized in that The cylinder (2) and the sliding support pipe (21) are connected through connecting rod or connecting sheet (22).

10. The arrow-shaped controllable pressure regulating valve according to any one of claims 1 to 9, characterized in that, The upper end of the body (1) is provided with a drill rod female buckle (12), and the lower end is provided with a drill rod male buckle (13); the inside of the body (1) is provided with a mounting step (11), and the barrel (2) is arranged on the mounting step (11).

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