CN115450565A - Remote control variable diameter stabilizer and control method - Google Patents

Abstract

The invention provides a remote control reducing stabilizer and a control method, wherein the remote control reducing stabilizer comprises a shell, a core sleeve assembly capable of sliding along the axial direction is arranged in the shell, the core sleeve assembly is of a through structure, the outer wall of the core sleeve assembly is provided with a plurality of inclined plane bodies, the inclined plane bodies are contacted with a radial piston movably penetrating through the shell, and the radial piston is driven to stretch and retract along the radial direction through the axial movement of the inclined plane bodies; the outer wall of the core sleeve component is provided with a reducing limiting mechanism which can rotate and can not move axially relative to the core sleeve component, the surface of the reducing limiting mechanism is provided with a slide rail groove, a movable pin is fixedly arranged on the shell and is positioned in the slide rail groove to slide so as to limit the displacement stroke of the core sleeve component. By adopting the structure of the reducing limiting mechanism, a larger stroke difference can be obtained because the reducing limiting mechanism is not limited by a sliding repose angle, so that the radial piston is controlled to extend out for a sufficient length. Thus obtaining a larger diameter-changing range.

Description

Remote control variable diameter stabilizer and control method

technical field

The invention relates to the field of wellbore track control in the oil drilling construction process, in particular to a remote-control variable-diameter stabilizer and a control method.

Background technique

With the development of oil and gas exploration and development, directional wells, highly deviated wells, horizontal wells, extended reach wells, multilateral wells, cluster wells and deep wells and ultra-deep wells under complex geological structure conditions are increasing, and there is an urgent need for more functional wells Eye trajectory control tools to achieve precise control of changing the mechanical properties of the bottom hole assembly (BHA) downhole. The remote variable diameter stabilizer is an efficient auxiliary tool for increasing speed and efficiency in the well trajectory control tool, and it can be used in combination with tools such as screw drilling tools. It can effectively increase the ROP, and at the same time, it can also assist the rotary steerable tool to optimize the wellbore quality and improve the drilling efficiency. During use, the variable-diameter stabilizer is usually arranged behind the drilling tool, and the inclination angle of the drilling tool can be controlled by changing the diameter of the variable-diameter stabilizer. At present, foreign companies such as Baker Hughes and Halliburton have developed related remote-control variable-diameter stabilizers, which can realize the functions of declination, inclination enhancement and inclination stabilization through drilling tool assemblies. But it has the problem of high acquisition cost. However, the technology of domestic remote-controlled variable-diameter stabilizers started relatively late, and most of them are mainly mechanical-hydraulic structures. The common problem is that they are not equipped with safety buffer devices. The radial piston of the tool tends to protrude when the flow path is removed, which often scratches the well wall and even causes well collapse accidents during the drilling process. Chinese patent document CN108952578 A describes a drilling remote control variable diameter stabilizer, which controls the telescopic movement of the radial piston through the end face slope of the ratchet. However, this structure uses the difference of the end slope to limit the position, and the end slope is also used as a driving structure. Due to the limitation of the sliding angle of repose, the height difference of the axial displacement is limited, and the telescopic height of the corresponding piston is also limited. CN 105275397 A describes a remote-control variable-diameter stabilizer, which also adopts a short-slope limiting and driving structure, and also has the same problem. The above-mentioned solution also has the defect that if the pressure of the liquid medium fluctuates greatly, the radial piston may be ejected and cause an accident.

Contents of the invention

The technical problem to be solved by the present invention is to provide a remote control variable diameter stabilizer and a control method, which can control the radial piston to extend different length strokes, and is not limited by the sliding angle of repose, and the extended length is sufficient to adapt to different inclination adjustments Requirements, in the preferred solution, the buffer device provided can buffer the short-wave vibration of the liquid medium, so as to avoid the radial piston being pushed out by mistake due to the small pressure vibration of the liquid medium.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a remote control variable-diameter stabilizer, including a casing, and a core sleeve assembly that can slide in the axial direction is arranged in the casing. The outer wall of the component is provided with a plurality of inclined planes, and the inclined planes are in contact with the radial pistons that move through the casing, and the radial pistons are driven to expand and contract radially through the axial movement of the inclined planes;

The outer wall of the core sleeve assembly is provided with a variable diameter limiting mechanism that can rotate and cannot move axially relative to the core sleeve assembly. There is a slide rail groove on the surface of the variable diameter limiting mechanism, and a movable pin is fixed on the outer shell. The movable pin is located on the slide rail. Sliding in the groove to limit the displacement stroke of the core sleeve assembly.

In a preferred solution, the slide rail groove is provided with a plurality of upper limit positions with different elevations, so that the core sleeve assembly has different axial strokes, and the corresponding radial pistons have different radial telescopic strokes.

In a preferred solution, a second upper limit position, a first upper limit position, a second lower limit position and a first lower limit position are provided in the slide rail groove;

Wherein the elevation of the second upper limit position is higher than the elevation of the first upper limit position, and the elevation of the second lower limit position is equal to the first lower limit position;

The second upper limit position, the first upper limit position, the second lower limit position and the first lower limit position are alternately arranged on the plane perpendicular to the axis, that is, the second upper limit position, the second lower limit position, the first The upper limit position and the first lower limit position are alternately arranged sequentially along the circumference.

In a preferred solution, the second upper limit position, the second lower limit position, the first upper limit position and the first lower limit position are connected by a slide rail groove of a straight line segment and an oblique line segment;

In the upward slanted line segment of the movable pin, the length of the upper hypotenuse is greater than the length of the lower hypotenuse; in the downward slanted segment of the movable pin, the length of the upper hypotenuse is less than the length of the lower hypotenuse; so that the movable pin Drive the variable diameter limiting mechanism to rotate on the outer wall of the core sleeve assembly.

In a preferred solution, a plurality of protruding spiral airfoils are arranged on the outer wall of the housing, the spiral airfoils are distributed along the circumference, spiral grooves are provided between the spiral airfoils, and the radial piston is arranged on the surface of the spiral airfoils , each helical airfoil is provided with multiple radial pistons;

The radial piston is connected to the inclined plane body through a dovetail groove structure, and the dovetail grooves are arranged along the slope of the inclined plane body.

In a preferred solution, a push cover is provided on the top of the core sleeve assembly, and the upper end surface of the push cover constitutes the structure of the piston end face, which is used to drive the core sleeve assembly to move downward;

A second spring is arranged between the core sleeve assembly and the shell to make the core sleeve assembly ascend and return.

In the preferred scheme, a buffer device is also provided between the core sleeve assembly and the shell. The structure of the buffer device is: a claw body is provided between the core sleeve assembly and the shell, and a plurality of cantilevers are arranged on the claw body. There is a prism at the free end of the shell, and a limiting groove for accommodating the prism is provided on the inner wall of the shell. When the prism is located in the limiting groove, the claw body is axially limited, and the outer wall of the core sleeve corresponds to the prism. There is an avoidance cavity at the position, when the avoidance cavity descends to the position of the edge platform, the edge platform comes out from the limit groove, and the axial limit of the claw body is released;

In the core sleeve assembly, the core sleeve is slidingly socketed with the upper mandrel, the upper mandrel is fixedly connected with a plurality of inclined planes, and a relative sliding limit mechanism is provided between the core sleeve or the claw body and the upper mandrel;

The top of the core sleeve is connected with the push cover, and the push cover drives the core sleeve to move axially;

A first spring is arranged between the bottom of the core sleeve and the shell.

In a preferred solution, a spring seat is provided at the bottom of the first spring, and the spring seat and the upper mandrel are connected in a relatively axially movable and non-rotatable manner;

The spring seat is fixedly connected with the shell through the fixing pin;

The direction of the cantilever extends along the axial direction, the bottom of the cantilever is connected with the claw body, and the top of the cantilever is provided with a prism;

The outer wall of the upper mandrel is provided with a chute along the axial direction, and the core sleeve is provided with an escape chute, one end of the pin is fixedly connected with the bottom of the claw body, and the other end passes through the avoidance chute and slides with the chute of the upper mandrel Connect, and drive the upper mandrel down at the limit position of the lower stroke;

The relative motion stroke between the upper mandrel and the claw body is greater than the motion stroke when the axial movement of the core sleeve makes the lip of the claw body escape from the limit groove;

The upper mandrel is fixedly connected with the middle pup, and the variable diameter limit mechanism is rotatably set on the outer wall of the middle pup, and moves along the axial direction with the middle pup;

The middle pup joint is fixedly connected with the lower mandrel, and the bottom of the lower mandrel is provided with a tapered mouth, the top diameter of the tapered mouth is small, and the bottom diameter is large;

The bottom of the shell is provided with a lower joint, and a signal valve is provided in the center of the lower joint. The signal valve includes a conical head in the center, and a plurality of axial flow passages are provided near the edge of the conical head. The liquid medium flows from the conical head Flowing around, the conical head of the signal valve cooperates with the conical port, and the flow section between the conical head and the conical port is changed through the axial displacement of the core sleeve assembly, and the pressure of the liquid medium is changed.

In the preferred solution, a pressure relief hole is provided near the top of the core sleeve, and an annular groove is provided on the inner wall of the core sleeve. The pressure relief hole communicates with the annular groove, and the pressure relief hole is used to eliminate the pressure between the core sleeve and the outer shell. ;

A sealed cavity is formed between the core sleeve assembly and the shell, and a balance piston is arranged in the cavity, and the balance piston separates the cavity into a first sealed cavity and a second sealed cavity, and the first sealed cavity is filled with liquid medium;

The second sealed cavity communicates with the outside through a filter plug;

The balance piston is used to compensate the volume change of the cavity due to the radial expansion and contraction of the radial piston and realize the pressure balance between the cavity and the outside world.

A control method using the above-mentioned remote control variable-diameter stabilizer, comprising the following steps:

S1. Start the liquid pump for the first time, make the liquid medium reach the preset pressure, push the core sleeve assembly downward, and the inclined plane pushes out the radial piston until the variable diameter limiting mechanism limits the core sleeve assembly to the first limit through the movable pin position, at this time the radial piston is in the first extended position;

There is a conical opening at the bottom of the core sleeve assembly, the signal valve is fixedly connected to the shell at the position opposite to the conical opening, and the top of the signal valve is provided with a conical head;

When the core sleeve assembly is located at different extreme positions, the flow cross section between the conical mouth and the conical head changes, and the change of the flow cross section affects the pressure value of the liquid medium;

Determine the radial position of the radial piston by detecting the pressure value of the liquid medium;

S2. Stop the liquid pump, reset the core sleeve assembly, and retract the radial piston to be flush with the outer surface of the casing;

S3. Start the liquid pump for the second time to make the liquid reach the preset pressure, push the core sleeve assembly downward, and the inclined plane pushes out the radial piston until the variable diameter limiting mechanism limits the core sleeve assembly to the second limit position through the movable pin , at this time the radial piston is in the second extended position;

S4. Stop the liquid pump, reset the core sleeve assembly, and retract the radial piston to be flush with the outer surface of the casing;

By starting and stopping the liquid pump, the radial pistons are switched in different extended positions or flush with the surface of the housing.

The present invention provides a remote-controlled variable-diameter stabilizer and its method. By adopting the structure of the variable-diameter limit mechanism, it is not limited by the sliding angle of repose, and can obtain a large stroke difference, thereby controlling the radial piston to protrude enough length. That is, a larger variable diameter range is obtained. In the preferred solution, the buffer device is provided with a structure of double springs and claws. Only when the pressure of the liquid medium reaches a certain value, the radial piston will protrude, filtering out the small fluctuations of the liquid medium. vibration, reducing the risk of tool sticking. The design of double springs also enhances the vibration reduction effect of the internal structure of the tool. The two sets of springs are arranged up and down, and the force distribution is more uniform. The radial piston of the tool has at least two working states, that is, half the height of the shell surface and the full height of the protruding surface. Different heights are suitable for different well conditions and environments, and the performance of the tool is enhanced.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a schematic diagram of the overall appearance and structure of the present invention.

Fig. 2 is a schematic cross-sectional view of the overall structure of the present invention.

Fig. 3 is a schematic structural view of the core sleeve assembly of the present invention.

Fig. 4 is a schematic diagram of the unfolded structure of the slide rail groove in the present invention.

Fig. 5 is a schematic diagram of another preferred structure of the buffer device in the present invention.

In the figure: shell 1, limit groove 101, spiral airfoil 102, spiral groove 103, push cover 2, core sleeve 3, pressure relief hole 301, avoidance cavity 302, avoidance chute 303, claw body 4, edge platform 401, cantilever 402, pin 5, upper mandrel 6, chute 601, first spring 7, spring seat 8, spline section 81, fixed pin 9, bevel body 10, radial piston 11, thrust bearing 12, variable diameter Limiting mechanism 13, slide rail groove 131, second upper limit position 132, first upper limit position 133, second lower limit position 134, first lower limit position 135, straight line segment 136, oblique line segment 137, movable pin 14, Bearing seat 15, second threaded section 151, balance piston 16, first sealed cavity 161, second sealed cavity 162, middle nipple 17, third threaded section 171, fourth threaded section 172, lower mandrel 18, Tapered port 181, liquid passage 182, variable liquid passage 183, second spring 19, filter plug 20, retaining ring 21, signal valve 22, lower joint 23, first sealing ring 24, second sealing ring 25, The third sealing ring 26 , the fourth sealing ring 27 , the first thread segment 28 , and the dovetail groove 29 .

detailed description

Example 1:

As shown in Figures 1 to 3, a remote control variable-diameter stabilizer includes a casing 1. A core sleeve assembly that can slide in the axial direction is provided in the casing 1. The core sleeve assembly is a central structure, and the outer wall of the core sleeve assembly is provided with multiple A ramp body 10, the ramp body 10 is in contact with the radial piston 11 that moves through the housing 1, and the radial piston 11 is driven to expand and contract radially by the axial movement of the ramp body 10;

The outer wall of the core sleeve assembly is provided with a variable diameter limiting mechanism 13 that can rotate and cannot move axially relative to the core sleeve assembly. A slide rail groove 131 is provided on the surface of the variable diameter limiting mechanism 13, and a movable pin 14 is fixed on the shell 1. The movable pin 14 slides in the slide rail groove 131 to limit the displacement stroke of the core sleeve assembly. With this structure, through the structural combination of the ramp body 10 and the variable diameter limiting mechanism 13, the present application can limit the radial telescopic displacement distance of the radial piston 11 through the slide rail groove 131. Unlike the prior art, the slide rail groove The travel of the 131 is virtually unlimited. This makes the radial telescopic displacement distance of the radial piston 11 unrestricted. Therefore, the present invention can conveniently adjust and adapt to the needs of different downhole working conditions. In particular, the mechanical characteristics of the BHA are required to facilitate the adjustment of the guidance of the drilling tool pair.

The preferred solution is shown in Figure 4, the slide rail groove 131 is provided with a plurality of upper limit positions with different elevations, so that the core sleeve assembly has different axial strokes, and the corresponding radial piston 11 has different radial telescopic strokes .

The preferred solution is shown in Figure 4, in the slide rail groove 131, there are a second upper limit position 132, a first upper limit position 133, a second lower limit position 134 and a first lower limit position 135;

Wherein the elevation of the second upper limit position 132 is higher than the elevation of the first upper limit position 133, and the elevation of the second lower limit position 134 and the first lower limit position 135 are equal;

The second upper limit position 132, the first upper limit position 133, the second lower limit position 134 and the first lower limit position 135 are alternately arranged on a plane perpendicular to the axis, that is, the second upper limit position 132, the second lower limit position The limit position 134 , the first upper limit position 133 and the first lower limit position 135 are alternately arranged sequentially along the circumference. What is recorded in this example is that three groups of travel positions can be realized, including the second upper limit position 132, the first upper limit position 133 and the second lower limit position 134, but according to needs, more upper limit positions are set, that is, the radial It is possible to have different extension strokes to the piston 11 .

The preferred solution is as shown in Figure 4, where the second upper limit position 132, the second lower limit position 134, the first upper limit position 133 and the first lower limit position 135 pass through a slide rail with a straight line segment 136 and an oblique line segment 137 Slot 131 connection;

In the upward oblique line segment 137 of the movable pin 14, the length of the upper hypotenuse is greater than the length of the lower hypotenuse; in the downward oblique segment 137 of the movable pin 14, the length of the upper hypotenuse is less than the length of the lower hypotenuse; The movable pin 14 drives the variable diameter limiting mechanism 13 to rotate on the outer wall of the core sleeve assembly. That is, every reciprocating movement of the core sleeve assembly, even if the movable pin 14 advances one station to the left in FIG. 4 , that is, reaches the previous straight line segment 136 . Fig. 4 is an expanded view of a circumferential surface, that is, it should be understood that the left and right sides of Fig. 4 are connected end to end.

In the preferred schemes 3 and 4, both ends of the variable diameter limiting mechanism 13 are connected to the core sleeve assembly through bearings, and one end is also compressed by the bearing seat 15 . In this example, the bearing housing 15 is threadedly connected to the outer wall of the middle short joint 17 .

The preferred solution is as shown in Figures 1 to 3, the outer wall of the housing is provided with a plurality of raised helical airfoils 102, the helical airfoils 102 are distributed along the circumference, and helical grooves 103 are arranged between the helical airfoils 102, the helical airfoils 102 The helix angle of the groove 103 is designed to be the lift angle that is most conducive to mud circulation and chip removal during tool use. The radial piston 11 is arranged on the surface of the helical airfoil 102, and each helical airfoil 102 is provided with a plurality of radial pistons 11 . The outer surfaces of the spiral airfoil 102 and the radial piston 11 are inlaid with ceramic sheets or hard alloy sheets for wear-resistant treatment.

A preferred solution is shown in FIG. 3 , where the radial piston 11 and the inclined plane body 10 are structurally connected through a dovetail groove 29 , and the dovetail groove 29 is arranged along the slope of the inclined plane body 10 . With this structure, it is possible to facilitate sliding and retract the radial piston 11 .

The preferred solution is as shown in Figure 2, a push cover 2 is provided on the top of the core sleeve assembly, and the upper end surface of the push cover 2 constitutes the structure of the piston end face, which is used to drive the core sleeve assembly to move downward; preferably, the upper end surface of the push cover 2 A ceramic or alloy layer is provided to improve wear resistance.

A second spring 19 is provided between the core sleeve assembly and the shell 1 to make the core sleeve assembly return upward.

The preferred scheme is as shown in Fig. 2 and 3, a buffer device is also provided between the core sleeve assembly and the shell 1, and the structure of the buffer device is: a claw body 4 is provided between the core sleeve assembly and the shell 1, and the claw body 4 is provided with a plurality of cantilevers 402, the free end of the cantilever 402 is provided with a prism 401, and the inner wall of the housing 1 is provided with a limit groove 101 for accommodating the prism 401, when the prism 401 is located in the limit groove 101, the card The claw body 4 is axially limited, and an avoidance cavity 302 is provided at the position corresponding to the outer wall of the core sleeve 3 and the abutment 401. When the avoidance cavity 302 goes down to the position of the abutment 401, the abutment 401 moves from the limiting groove 101 Detachment, release the axial limit of the claw body 4;

In the core sleeve assembly, the core sleeve 3 is slidingly socketed with the upper mandrel 6, and the upper mandrel 6 is fixedly connected with a plurality of inclined plane bodies 10, and a relative sliding mechanism is provided between the core sleeve 3 or the claw body 4 and the upper mandrel 6. limit mechanism;

The top of the core sleeve 3 is connected to the push cover 2, and the push cover 2 drives the core sleeve 3 to move in the axial direction;

A first spring 7 is provided between the bottom of the core sleeve 3 and the shell 1 .

The preferred solution is shown in Figure 2, the bottom of the first spring 7 is provided with a spring seat 8, and the spring seat 8 and the upper mandrel 6 are connected in a relatively axially movable and non-rotatable manner; for example, a spline connection.

In a preferred solution, the spring seat 8 is fixedly connected to the housing 1 through a fixing pin 9 , and the fixing pin 9 passes between the spring seat 8 and the upper mandrel 6 to be connected in a relatively axially movable and non-rotatable manner. That is, the spring seat 8 and the upper mandrel 6 are splined, and the end of the fixed pin 9 is also provided with a groove, and the groove is also sleeved on the spline of the upper mandrel 6 to limit the upper mandrel. The rotation of 6, thus structure, is conducive to reducing sliding friction.

A preferred solution is shown in FIG. 2 , the direction of the cantilever 402 extends along the axial direction, the bottom of the cantilever 402 is connected to the jaw body 4 , and the top of the cantilever 402 is provided with a prism 401 . This solution is preferred in this case.

In a preferred solution, the upper mandrel 6 is fixedly connected to the middle short joint 17 , and the diameter reducing mechanism 13 is rotatably arranged on the outer wall of the middle short joint 17 and moves axially with the middle short joint 17 .

In a preferred solution, the middle nipple 17 is fixedly connected to the lower mandrel 18, and the bottom of the lower mandrel 18 is provided with a tapered mouth 181, the top diameter of the tapered mouth 181 is smaller, and the bottom diameter is larger;

The bottom of the casing 1 is provided with a lower joint 23, and a signal valve 22 is provided at the center of the lower joint 23. The signal valve 22 includes a conical head in the center, and a plurality of axial flow passages are provided near the edge of the conical head. The medium flows around the conical head, the conical head of the signal valve 22 cooperates with the conical port 181, the flow section between the conical head and the conical port 181 is changed through the axial displacement of the core sleeve assembly, and the liquid The pressure of the medium changes. By monitoring the pressure of the liquid medium and comparing the pressure values at multiple different positions, the position of the radial piston 11 can be obtained. Generally, the longer the stroke of the radial piston 11 is, the higher the pressure value of the liquid medium will be. The larger the magnitude.

In a preferred solution, an axial chute 601 is provided on the outer wall of the upper mandrel 6, and a pin 5 is fixed on the core sleeve 3 or the claw body 4, and the pin 5 slides in the chute 601, and in the down stroke The limit position drives the upper mandrel 6 to descend.

The connection relationship between the core sleeve 3 and the upper mandrel 6 is shown in FIG. 2 . A chute 601 is provided on the upper mandrel 6 , and a pin 5 is provided at a position close to the bottom of the core sleeve 3 , and the pin 5 slides in the chute 601 . The core sleeve 3 first compresses the first spring 7, at this time the upper mandrel 6 will not follow, and the core sleeve 3 also needs to have enough axial thrust to overcome the locking between the claw body 4 and the inner wall of the housing 1 Force, so the scheme can overcome the interference caused by small fluctuations. When core sleeve 3 runs enough this is the process, and after pin 5 is contacted with the bottom of chute 601, just can drive upper mandrel 6 to descend, promptly drive ramp body 10 to descend, and radial piston 11 begins to stretch out.

The connection relationship between the claw body 4 and the upper mandrel 6 is shown in FIG. 5 . In Fig. 5, the connection method is that an avoidance chute 303 is provided on the core sleeve 3, one end of the pin 5 is fixedly connected with the bottom of the claw body 4, and the other end passes through the avoidance chute 303 and the chute 601 of the upper mandrel 6 Swipe to connect. When in use, the core sleeve 3 first compresses the first spring 7. At this time, the upper mandrel 6 and the claw body 4 will not follow until the stroke is sufficient, so that the claw body 4 starts to go down. At the position of the cavity 302 , the prism 401 continues to descend and escapes from the limiting groove 101 of the housing 1 . Now the claw body 4 continues to descend, and after the pin 5 contacts the bottom of the chute 601, the upper mandrel 6 will be driven downward, that is, the ramp body 10 will be driven downward, and the radial piston 11 will start to stretch out.

The preferred solution is as shown in Figure 2, the relative movement stroke between the upper mandrel 6 and the core sleeve 3 or the claw body 4 is greater than the axial movement of the core sleeve 3 to make the edge 401 of the claw body 4 escape from the limiting groove 101 Movement itinerary.

In a preferred solution, the core sleeve 3 is provided with a pressure relief hole 301 near the top, and an annular groove is arranged on the inner wall of the core sleeve 3. The pressure relief hole 301 communicates with the annular groove, and the pressure relief hole 301 is used to eliminate the contact between the core sleeve 3 and the Hold pressure between enclosures 1.

In a preferred solution, a sealed cavity is formed between the core sleeve assembly and the shell 1, and a balance piston 16 is arranged in the cavity, and the balance piston 16 divides the cavity into a first sealed cavity 161 and a second sealed cavity 162 , the first sealed cavity 161 is filled with a liquid medium, preferably hydraulic oil;

The second sealed cavity 162 communicates with the outside through a filter plug 20; the outside here refers to the annular space outside the tool and inside the oil well.

The balance piston 16 is used to compensate the volume change of the cavity due to the radial expansion and contraction of the radial piston 11 and realize the pressure balance between the cavity and the outside world.

Example 2:

Among Fig. 1, 3～5, carry out specific description to the present invention with optimum structure.

The present invention is composed of two structural parts of the shell 1 and the core sleeve assembly, wherein, the middle part of the shell 1 is provided with a spiral airfoil 102, and a spiral groove 103 is provided between the spiral airfoils 102, and a spiral groove 103 is arranged on the spiral airfoil 102 from top to bottom There are four radial pistons 11, the bottom of the casing 1 is fixedly connected with the lower joint 23, and a signal valve 22 is arranged in the lower joint 23, and the signal valve 22 is provided with a conical head, and multiple valves are arranged around the conical head of the signal valve 22. a flow hole.

The core sleeve assembly is provided with a push cover 2, a core sleeve 3, an upper mandrel 6, a middle nipple 17 and a lower mandrel 18 from top to bottom. Due to the existence of the pressure drop, the top end surface of the push cover 2 also forms a piston structure. The push cover 2 is fixedly connected with the core sleeve 3 , and the outer wall of the push cover 2 forms a seal with the inner wall of the casing 1 through the first sealing ring 24 . The push cover 2 is inserted into the core sleeve 3 and connected by threads. The claw body 4 is arranged between the core sleeve 3 and the shell 1, and the truss 401 of the claw body 4 is stuck in the limit groove 101 of the inner wall of the shell 1. Due to the limited space, it is blocked by the outer wall of the core sleeve 3, and the ridge 401 It cannot come out and realize the limit. The bottom of the core sleeve 3 is sleeved in the upper mandrel 6 , and the outer wall of the core sleeve 3 is provided with a sealing ring and is in sealing sliding connection with the inner wall of the upper mandrel 6 . At the position close to the upper end of the upper mandrel 6, a pressure relief hole 301 is provided on the step side of the inner wall of the core sleeve 3 to discharge the upper mandrel 6 when the relative distance between the core sleeve 3 and the upper mandrel 6 changes. hydraulic oil on top. This structure also has a cushioning effect. As shown in FIG. 5 , one end of the pin 5 is connected to the bottom of the claw body 4 , and the other end slides through the avoiding chute 303 and is slidably connected to the chute 601 . The bottom of the core sleeve 3 is in contact with the first spring 7 , and the bottom of the first spring 7 is in contact with the spring seat 8 , and the spring seat 8 is connected to the upper mandrel 6 through a spline section 81 in a spline manner. The spring seat 8 is fixedly connected with the housing 1 through a plurality of fixing pins 9 . The bottom of the spring seat 8 is in contact with a plurality of inclined planes 10, and the topmost inclined plane 10 is in contact with the shoulder of the spring seat 8 and the upper mandrel 6 at the same time. The spring seat 8 is used for travel limit, and the shaft of the upper mandrel 6 The shoulders are used to push the ramp body 10 down. An oil channel is also provided on the casing 1 for passing hydraulic oil and lubricating effect. A dovetail groove is provided on the inclined surface of the inclined plane body 10, and is connected with the radial piston 11 through the dovetail groove. The bottom of the upper mandrel 6 is threadedly connected with the middle nipple 17 through the third thread segment 171, the outer wall of the middle nipple 17 is provided with a shoulder, and a thrust bearing 12 is provided, and a variable diameter limiting mechanism 13 is arranged under the thrust bearing 12, Another thrust bearing 12 is provided below the variable diameter limiting mechanism 13 . The bottom of the thrust bearing 12 is provided with a bearing seat 15 . A sliding rail groove 131 is provided on the surface of the variable diameter limiting mechanism 13 , the movable pin 14 is fixedly connected with the housing 1 , and the movable pin 14 slides in the sliding rail groove 131 . The cavity below the bearing seat 15 is provided with a balance piston 16, and the inner and outer walls of the balance piston 16 are provided with a second sealing ring 25 to form a sealed structure, and the first sealing cavity 161 above the balance piston 16 is filled with Hydraulic oil. The bottom of the middle short joint 17 is fixedly connected with the lower mandrel 18 through threads, and the bottom of the middle short joint 17 and the lower mandrel 18 form a seal through the third sealing ring 26 . A filter plug 20 is provided on the shell 1 at the position of the second sealed cavity 162 to balance the pressure. A shoulder is provided on the outer wall of the lower mandrel 18, and a through hole is also provided. The bottom of the shoulder is in contact with the second spring 19, the bottom of the second spring 19 is in contact with the retaining ring 21, and the retaining ring 21 is socketed with the lower joint 23. The signal valve 22 is located in the middle of the stop ring 21 . The bottom of the lower mandrel 18 is provided with a conical opening 181 , and the conical opening 181 faces the signal valve 22 .

Example 3:

On the basis of embodiment 1, 2, a kind of control method that adopts above-mentioned remote-control variable-diameter stabilizer comprises the following steps:

As shown in Figures 2 and 5, S1, start the liquid pump for the first time, make the liquid medium reach the preset pressure, push the core sleeve assembly downward, and the core sleeve 3 is buffered for a certain distance under the action of the first spring 7, so that the claw body 4 Disengage from the shell 1 until the pin 5 drives the upper mandrel 6 to go down, the upper mandrel 6 drives the inclined plane body 10 to go down, and the inclined plane body 10 pushes out the radial piston 11 until the variable diameter limiting mechanism 13 is limited by the movable pin 14 An upper limit position 133, that is, the core sleeve assembly is limited to the first limit position. At this time, the radial piston 11 is located at the first extended position. Here, due to the short downward distance of the inclined plane body 10, the extension stroke of the radial piston 11 is also short. shorter;

S2. Stop the liquid pump, the core sleeve assembly is reset under the action of the first spring 7 and the second spring 19, and the radial piston 11 is retracted under the action of the dovetail groove 29 to be flush with the outer surface of the casing 1;

S3. Start the liquid pump for the second time to make the liquid reach the preset pressure, push the core sleeve assembly down, and the inclined plane body 10 pushes out the radial piston 11 until the variable diameter limiting mechanism 13 is limited to the second upper limit by the movable pin 14 Position 132, that is, the core sleeve assembly is limited to the second extreme position, at this time the radial piston 11 is located at the second extended position; here, because the slope body 10 has a longer downward distance, the extended stroke of the radial piston 11 is also longer;

S4. Stop the liquid pump, reset the core sleeve assembly, and retract the radial piston 11 to be flush with the outer surface of the casing 1;

By starting and stopping the liquid pump, the switching radial piston 11 assumes different extended positions or is flush with the surface of the housing 1 . In this example, only two stroke positions of the radial piston 11 are shown, but it is also feasible to set more stroke positions.

The preferred solution is as shown in Figure 2, including the following steps: a tapered port 181 is provided at the bottom of the core sleeve assembly, a signal valve 22 is fixedly connected to the housing 1 at a position opposite to the tapered port 181, and the top of the signal valve 22 is provided with Tapered head; when the core sleeve assembly is located at different extreme positions, the flow cross section between the tapered mouth 181 and the tapered head changes, and the change of the flow cross section affects the pressure value of the liquid medium; in steps S1 and S3 , judge the radial position of the radial piston 11 by detecting the pressure value of the liquid medium.

The above-mentioned embodiments are only preferred technical solutions of the present invention, and should not be regarded as limitations on the present invention. The embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other if there is no conflict. The scope of protection of the present invention shall be the technical solution described in the claims, including equivalent replacements for the technical features in the technical solution described in the claims. That is, equivalent replacement and improvement within this range are also within the protection scope of the present invention.

Claims (10)

1. A remote-controlled variable-diameter stabilizer, which is characterized in that: it includes a casing (1), and a core sleeve assembly that can slide in the axial direction is arranged inside the casing (1). The core sleeve assembly is a central structure, and the outer wall of the core sleeve assembly A plurality of inclined planes (10) are provided, and the inclined planes (10) are in contact with the radial piston (11) that moves through the housing (1), and the axial movement of the inclined planes (10) drives the diameter of the radial piston (11) To stretch; The outer wall of the core sleeve assembly is provided with a variable diameter limiting mechanism (13) that can rotate and cannot move axially relative to the core sleeve assembly. A sliding rail groove (131) is provided on the surface of the variable diameter limiting mechanism (13). ) is fixed with a movable pin (14), and the movable pin (14) slides in the slide rail groove (131) to limit the displacement stroke of the core sleeve assembly. 2. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: the slide rail groove (131) is provided with a plurality of upper limit positions of different elevations, so that the core sleeve assembly has different axes The corresponding radial pistons (11) have different radial telescopic strokes. 3. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: the slide rail groove (131) is provided with a second upper limit position (132), a first upper limit position (133 ), the second lower limit position (134) and the first lower limit position (135); Wherein the elevation of the second upper limit position (132) is higher than the elevation of the first upper limit position (133), and the elevation of the second lower limit position (134) and the first lower limit position (135) are equal; The second upper limit position (132), the first upper limit position (133), the second lower limit position (134) and the first lower limit position (135) are arranged alternately on the plane perpendicular to the axis, that is, the second The upper limit position (132), the second lower limit position (134), the first upper limit position (133) and the first lower limit position (135) are sequentially arranged alternately along the circumference. 4. A remote-controlled variable-diameter stabilizer according to claim 3, characterized by: the second upper limit position (132), the second lower limit position (134), the first upper limit position (133) and the first The lower limit positions (135) are connected by a slide rail groove (131) of a straight line segment (136) and an oblique line segment (137); In the upward slanted segment (137) of the movable pin (14), the length of the upper hypotenuse is greater than the length of the lower hypotenuse; in the downward oblique segment (137) of the movable pin (14), the length of the upper hypotenuse Less than the length of the hypotenuse on the lower side; so that the movable pin (14) drives the variable diameter limit mechanism (13) to rotate on the outer wall of the core sleeve assembly. 5. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: there are a plurality of raised spiral airfoils (102) on the outer wall of the housing, and the spiral airfoils (102) are distributed along the circumference , there is a spiral groove (103) between the spiral airfoils (102), the radial piston (11) is arranged on the surface of the spiral airfoil (102), and each spiral airfoil (102) is provided with a plurality of radial pistons (11); The radial piston (11) is connected to the bevel body (10) through a dovetail groove (29), and the dovetail groove (29) is arranged along the slope of the bevel body (10). 6. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: a push cover (2) is provided on the top of the core sleeve assembly, and the upper end surface of the push cover (2) constitutes the structure of the piston end surface, which is used to Drive the core sleeve assembly to move downward; A second spring (19) is arranged between the core sleeve assembly and the shell (1) to make the core sleeve assembly ascend and return. 7. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: a buffer device is also provided between the core sleeve assembly and the shell (1), and the structure of the buffer device is: between the core sleeve assembly and the shell A claw body (4) is arranged between (1), and a plurality of cantilevers (402) are arranged on the claw body (4). The inner wall of the inner wall is provided with a limit groove (101) for accommodating the edge platform (401). When the edge platform (401) is located in the limit groove (101), the claw body (4) is axially limited, and the core sleeve ( 3) An avoidance cavity (302) is provided at the position corresponding to the outer wall of the edge platform (401). ) to come out and release the axial limit of the claw body (4); In the core sleeve assembly, the core sleeve (3) is slidingly socketed with the upper mandrel (6), the upper mandrel (6) is fixedly connected with a plurality of inclined planes (10), and the core sleeve (3) or the claw body (4) There is a relative sliding limit mechanism with the upper mandrel (6); The top of the core sleeve (3) is connected with the push cover (2), and the push cover (2) drives the core sleeve (3) to move axially; A first spring (7) is provided between the bottom of the core sleeve (3) and the shell (1). 8. A remote-controlled variable-diameter stabilizer according to claim 7, characterized in that: the bottom of the first spring (7) is provided with a spring seat (8), between the spring seat (8) and the upper mandrel (6) Connected in a relatively axially movable, non-rotatable manner; The spring seat (8) is fixedly connected with the housing (1) through the fixing pin (9); The direction of the cantilever (402) extends along the axial direction, the bottom of the cantilever (402) is connected with the claw body (4), and the top of the cantilever (402) is provided with a prism (401); An axial chute (601) is provided on the outer wall of the upper mandrel (6), and an avoidance chute (303) is provided on the core sleeve (3). One end of the pin (5) and the bottom of the claw body (4) Fixedly connected, the other end passes through the avoidance chute (303) and is slidably connected with the chute (601) of the upper mandrel (6), and drives the upper mandrel (6) down at the limit position of the lower stroke; The relative movement stroke between the upper mandrel (6) and the claw body (4) is greater than the axial movement of the core sleeve (3) to make the edge (401) of the claw body (4) come out of the limit groove (101) exercise itinerary; The upper mandrel (6) is fixedly connected with the middle pup (17), and the reducing mechanism (13) is rotatably set on the outer wall of the middle pup (17), and moves along the axial direction with the middle pup (17) ; The middle nipple (17) is fixedly connected with the lower mandrel (18), and the bottom of the lower mandrel (18) is provided with a tapered mouth (181), the top diameter of the tapered mouth (181) is small, and the bottom diameter is large; The bottom of the casing (1) is provided with a lower joint (23), and the center of the lower joint (23) is provided with a signal valve (22). There are multiple axial passages, and the liquid medium flows around the conical head. The conical head of the signal valve (22) cooperates with the conical port (181). The axial displacement of the core sleeve assembly changes the conical head and The flow cross-section between the tapered ports (181) changes the pressure of the liquid medium. 9. A remote-controlled variable-diameter stabilizer according to claim 1, characterized in that: a pressure relief hole (301) is provided near the top of the core sleeve (3), and a ring is provided on the inner wall of the core sleeve (3). Groove, the pressure relief hole (301) communicates with the annular groove, and the pressure relief hole (301) is used to eliminate the pressure between the core sleeve (3) and the shell (1); A sealed cavity is formed between the core sleeve assembly and the shell (1), and a balance piston (16) is arranged in the cavity, and the balance piston (16) separates the cavity into a first sealed cavity (161) and a second sealed cavity. A cavity (162), filled with a liquid medium in the first sealed cavity (161); The second sealed cavity (162) communicates with the outside through a filter plug (20); The balance piston (16) is used to compensate the volume change of the cavity due to the radial expansion and contraction of the radial piston (11) and realize the pressure balance between the cavity and the outside world. 10. A control method using the remote-controlled variable-diameter stabilizer according to any one of claims 1 to 9, characterized in that it comprises the following steps: S1. Start the liquid pump for the first time, make the liquid medium reach the preset pressure, push the core sleeve assembly down, and the inclined plane (10) pushes out the radial piston (11) until the variable diameter limiting mechanism (13) passes the movable pin (14) Limiting the core sleeve assembly to the first extreme position, at this time the radial piston (11) is located at the first extended position; A conical port (181) is provided at the bottom of the core sleeve assembly, and the signal valve (22) is fixedly connected with the shell (1) at the position opposite to the conical port (181), and the top of the signal valve (22) is provided with a conical head; When the core sleeve assembly is located at different limit positions, the flow cross section between the conical mouth (181) and the conical head changes, and the change of the flow cross section affects the pressure value of the liquid medium; Judging the radial position of the radial piston (11) by detecting the pressure value of the liquid medium; S2. Stop the liquid pump, reset the core sleeve assembly, and retract the radial piston (11) to be flush with the outer surface of the casing (1); S3. Start the liquid pump for the second time to make the liquid reach the preset pressure, push the core sleeve assembly down, and the inclined plane (10) pushes out the radial piston (11) until the variable diameter limiting mechanism (13) passes through the movable pin ( 14) The core sleeve assembly is limited to the second limit position, at this time the radial piston (11) is located at the second extended position; S4. Stop the liquid pump, reset the core sleeve assembly, and retract the radial piston (11) to be flush with the outer surface of the casing (1); By starting and stopping the liquid pump, the radial piston (11) is switched in different extended positions or flush with the surface of the housing (1).

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