CN115450565A - Remote control reducing 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 reducing stabilizer and control method

Technical Field

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

Background

With the development of oil and gas exploration and development, deep wells and ultra-deep wells are increasingly increased under the conditions of directional wells, highly deviated wells, cluster wells and complex geological structures, and well track control tools with stronger functions are urgently needed to realize accurate control for changing the mechanical properties of a bottom drilling assembly (BHA) underground. The remote control variable diameter stabilizer is used as a high-efficiency auxiliary acceleration and efficiency improvement tool in a well track control tool and can be used in combination with tools such as a screw drill and the like. The drilling speed of the machine can be effectively improved, and meanwhile, the rotary steering tool can be assisted to optimize the quality of a well hole and improve the drilling efficiency. In the using process, the reducing 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 reducing stabilizer. At present, relevant remote control variable diameter stabilizers are developed in companies such as Beckhoss, haributton and the like abroad, and the functions of reducing, increasing and stabilizing the inclination can be realized through a drilling tool combination. But it has a problem of high purchase cost. The domestic remote control variable diameter stabilizer technology starts late, mostly takes a machine liquid type structure as a main part, and has the following common problems: all do not set up safe buffer, at the borehole operation in-process, when the mud of great pressure passes through the instrument runner, the radial piston of instrument will have the trend of stretching out, and this often can fish tail the wall of a well, can cause the well collapse accident even when creeping into the in-process. Chinese patent document CN 108952578A describes a remote-controlled variable-diameter drilling stabilizer, which controls the expansion and contraction of a radial piston by the inclined surface of the end surface of a ratchet. However, the structure adopts the difference of the end surface inclined planes for limiting, and the end surface inclined planes are also used as driving structures and are limited by the sliding angle of repose, the height difference of axial displacement is limited, and the telescopic height of the corresponding piston is also limited. CN 105275397A describes a remote-control diameter-variable stabilizer, which also adopts a limit and drive structure with a short oblique sliding surface, and has the same problems. The above solution also has the defect that if the pressure fluctuation of the liquid medium is large, the radial piston can be ejected out to cause accidents.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a remote-control variable-diameter stabilizer and a control method, which can control the radial piston to extend out of different length strokes without being limited by a sliding angle of repose, wherein the extending length is enough to adapt to different inclination adjusting requirements.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a remote control reducing stabilizer comprises a shell, wherein 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, a plurality of inclined planes are arranged on the outer wall of the core sleeve assembly, the inclined planes are in contact with a radial piston movably penetrating through the shell, and the radial piston is driven to stretch and retract in the radial direction through the axial movement of the inclined planes;

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.

In a preferred scheme, 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 preferable scheme, a second upper limit position, a first upper limit position, a second lower limit position and a first lower limit position are arranged in the slide rail groove;

the elevation of the second upper limit position is higher than that of the first upper limit position, and the elevation of the second lower limit position is equal to that of 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 arranged on a plane vertical to the axis in a staggered mode, namely the second upper limit position, the second lower limit position, the first upper limit position and the first lower limit position are arranged in a staggered mode in sequence along the circumference.

In the preferred scheme, the second upper limit position, the second lower limit position, the first upper limit position and the first lower limit position are connected through a slide rail groove of a straight line segment and an inclined line segment;

in the oblique line segment ascending on the movable pin, the length of the upper oblique edge is greater than that of the lower oblique edge; in the descending oblique line segment of the movable pin, the length of the upper oblique edge is smaller than that of the lower oblique edge; so that the movable pin drives the reducing limiting mechanism to rotate on the outer wall of the core sleeve component.

In a preferred scheme, a plurality of raised spiral wing surfaces are arranged on the outer wall of the shell, the spiral wing surfaces are distributed along the circumference, a spiral groove is formed between the spiral wing surfaces, radial pistons are arranged on the surfaces of the spiral wing surfaces, and each spiral wing surface is provided with a plurality of radial pistons;

the radial piston is connected with the inclined plane body through a dovetail groove structure, and the dovetail groove is arranged along the inclined plane of the inclined plane body.

In the preferred scheme, a push cover is arranged at the top of the core sleeve component, and the upper end face of the push cover forms a structure of a piston end face and is used for driving the core sleeve component to move downwards;

and a second spring is arranged between the core sleeve assembly and the shell so as to enable the core sleeve assembly to move upwards and reset.

In the preferred scheme, a buffer device is also arranged between the core sleeve assembly and the shell, and the buffer device has the structure that a jaw body is arranged between the core sleeve assembly and the shell, a plurality of cantilevers are arranged on the jaw body, a prismatic table is arranged at the free end of each cantilever, a limiting groove for accommodating the prismatic table is arranged on the inner wall of the shell, when the prismatic table is positioned in the limiting groove, the jaw body is axially limited, an avoidance cavity is arranged at the position of the outer wall of the core sleeve, which corresponds to the prismatic table, and when the avoidance cavity descends to the position of the prismatic table, the prismatic table is separated from the limiting groove, so that the axial limiting of the jaw body is relieved;

in the core sleeve component, a core sleeve is sleeved with an upper mandrel in a sliding manner, the upper mandrel is fixedly connected with a plurality of inclined plane bodies, and a limiting mechanism which slides relatively is arranged between the core sleeve or the jaw 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 along the axial direction;

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

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

the spring seat is fixedly connected with the shell through a fixed pin;

the direction of the cantilever extends along the axial direction, the bottom of the cantilever is connected with the clamping jaw body, and the top of the cantilever is provided with a prismatic table;

the outer wall of the upper mandrel is provided with an axial sliding groove, the core sleeve is provided with an avoiding sliding groove, one end of the pin is fixedly connected with the bottom of the jaw body, the other end of the pin penetrates through the avoiding sliding groove to be connected with the sliding groove of the upper mandrel in a sliding manner, and the upper mandrel is driven to move downwards at the limit position of the lower stroke;

the relative motion stroke between the upper mandrel and the jaw body is larger than the motion stroke of the axial movement of the mandrel sleeve to make the prismatic table of the jaw body separate from the limiting groove;

the upper mandrel is fixedly connected with the middle short section, and the reducing limiting mechanism is rotatably arranged on the outer wall of the middle short section and moves along the axial direction along with the middle short section;

the middle short section is fixedly connected with the lower mandrel, the bottom of the lower mandrel is provided with a conical opening, the top caliber of the conical opening is smaller, and the bottom caliber is larger;

the bottom of shell is equipped with the lower clutch, is equipped with the signal valve in the lower clutch center, and the signal valve includes a conical head that is located the center, and the conical head is close to the position of edge and is equipped with a plurality of axial through-flow passageways, and liquid medium flows through around the conical head, and the conical head and the bell mouth cooperation of signal valve change the through-flow cross-section between conical head and the bell mouth through the axial displacement of core cover subassembly to make the pressure of liquid medium change.

In the preferred scheme, a pressure relief hole is arranged at the position, close to the top, of the core sleeve, an annular groove is arranged on the inner wall of the core sleeve, the pressure relief hole is communicated with the annular groove, and the pressure relief hole is used for eliminating pressure build-up between the core sleeve and the shell;

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

the second sealed cavity is communicated with the outside through a filter plug;

the balance piston is used for compensating the volume change of the cavity after the radial piston is radially stretched and realizing the pressure balance between the cavity and the outside.

A control method adopting the remote control variable diameter stabilizer comprises the following steps:

s1, starting a liquid pump for the first time to enable a liquid medium to reach a preset pressure, pushing a core sleeve assembly to descend, ejecting a radial piston by an inclined plane body until a diameter-changing limiting mechanism limits the core sleeve assembly at a first limit position through a movable pin, and enabling the radial piston to be located at the first extending position;

the bottom of the core sleeve component is provided with a conical opening, the signal valve is fixedly connected with the shell at a 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 through-flow section between the conical opening and the conical head is changed, and the pressure value of the liquid medium is influenced by the change of the through-flow section;

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

s2, stopping the liquid pump, resetting the core sleeve assembly, and enabling the radial piston to retract to be flush with the outer surface of the shell;

s3, starting the liquid pump for the second time to enable the liquid to reach the preset pressure, pushing the core sleeve assembly to descend, ejecting the radial piston by the inclined plane body until the diameter-changing limiting mechanism limits the core sleeve assembly at a second limit position through the movable pin, and enabling the radial piston to be located at a second extending position;

s4, stopping the liquid pump, resetting the core sleeve assembly, and enabling the radial piston to retract to be flush with the outer surface of the shell;

by starting and stopping the liquid pump, the switching radial piston is in different extended positions or flush with the surface of the housing.

The invention provides a remote-control variable-diameter stabilizer and a method, wherein a variable-diameter limiting mechanism is adopted, and a larger stroke difference can be obtained due to the fact that the variable-diameter limiting mechanism is not limited by a sliding angle of repose, so that a radial piston is controlled to extend out to a sufficient length. Thus obtaining a larger diameter-changing range. In the preferred scheme, the buffer device is provided, and by adopting the structure of the double springs and the jaw body, the radial piston can stretch out only when the pressure of the liquid medium reaches a certain value, so that the vibration caused by small fluctuation of the liquid medium is filtered, and the risk of tool jamming is reduced. The design of dual spring has still strengthened instrument inner structure's damping effect, and overall arrangement about two sets of springs adopt, and strength distributes more evenly, has strengthened the effect that resets of instrument, and the performance is more stable, reduces the risk of the in-process accident of drawing a hole. The radial piston of the tool has at least two working states, namely a half height extending out of the surface of the shell and a full height extending out of the surface, different heights are suitable for different well condition environments, and the using performance of the tool is enhanced.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a schematic view of the overall appearance 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 a core-sheath assembly of the present invention.

FIG. 4 is a schematic view of the expanded structure of the slide rail groove of the present invention.

Fig. 5 is another preferred structure diagram of the buffering device of the present invention.

In the figure: the hydraulic oil cylinder comprises a shell 1, a limiting groove 101, a spiral wing surface 102, a spiral groove 103, a push cover 2, a core sleeve 3, a pressure relief hole 301, an avoiding cavity 302, an avoiding sliding groove 303, a jaw body 4, a frustum 401, a cantilever 402, a pin 5, an upper mandrel 6, a sliding groove 601, a first spring 7, a spring seat 8, a spline section 81, a fixed pin 9, a ramp body 10, a radial piston 11, a thrust bearing 12, a reducing limiting mechanism 13, a sliding rail groove 131, a second upper limit 132, a first upper limit 133, a second lower limit 134, a first lower limit 135, a straight line section 136, a ramp section 137, a movable pin 14, a bearing seat 15, a second thread section 151, a balance piston 16, a first seal cavity 161, a second seal cavity 162, a middle portion 17, a third thread section 171, a fourth thread section 172, a lower mandrel 18, a tapered port 181, a liquid passing channel 182, a variable liquid passing channel 183, a second spring 19, a filter plug 20, a stop ring 21, a signal valve 22, a lower joint 23, a first seal ring 24, a dovetail groove 25, a second seal ring 25, a fourth seal ring 28, a first seal ring 27, a second seal ring 26, a second seal ring 26 and a second seal ring.

Detailed Description

Example 1:

as shown in fig. 1 to 3, a remote-control variable-diameter stabilizer comprises a housing 1, wherein a core sleeve assembly capable of sliding along an axial direction is arranged in the housing 1, the core sleeve assembly is of a through structure, a plurality of inclined planes 10 are arranged on the outer wall of the core sleeve assembly, the inclined planes 10 are in contact with a radial piston 11 movably penetrating through the housing 1, and the radial piston 11 is driven to radially extend and retract through the axial movement of the inclined planes 10;

the outer wall of the core sleeve component is provided with a reducing limiting mechanism 13 which can rotate and can not axially move relative to the core sleeve component, the surface of the reducing limiting mechanism 13 is provided with a slide rail groove 131, a movable pin 14 is fixedly arranged on the shell 1, and the movable pin 14 is positioned in the slide rail groove 131 to slide so as to limit the displacement stroke of the core sleeve component. From this structure, through the structure combination of inclined plane body 10 and reducing stop gear 13, this application can limit radial piston 11 radial flexible displacement distance through slide rail groove 131, and different with prior art, the stroke of slide rail groove 131 is unrestricted almost. This also makes the radial piston 11 not restricted in radial expansion and contraction displacement distance. Therefore, the invention can conveniently adjust and adapt to different underground working condition requirements. Particularly the BHA mechanical properties, to facilitate steering of the drill tool pair.

Preferably, as shown in fig. 4, the slide groove 131 is provided with a plurality of upper limit positions with different elevations, so that the core-sheath assembly has different axial strokes and the corresponding radial pistons 11 have different radial telescopic strokes.

Preferably, as shown in fig. 4, the slide rail groove 131 is provided with a second upper limit 132, a first upper limit 133, a second lower limit 134 and a first lower limit 135;

wherein the second upper limit 132 has an elevation higher than the elevation of the first upper limit 133, and the second lower limit 134 has an elevation equal to the elevation of the first lower limit 135;

the second upper limit positions 132, the first upper limit positions 133, the second lower limit positions 134 and the first lower limit positions 135 are arranged in a staggered manner on a plane perpendicular to the axis, that is, the second upper limit positions 132, the second lower limit positions 134, the first upper limit positions 133 and the first lower limit positions 135 are arranged in a staggered manner in sequence along the circumference. In the present example, three sets of stroke positions are described, including the second upper limit 132, the first upper limit 133 and the second lower limit 134, but more upper limits are provided as required, even if it is feasible for the radial piston 11 to have different extension strokes.

Preferably, as shown in fig. 4, the second upper limit 132, the second lower limit 134, the first upper limit 133 and the first lower limit 135 are connected by a straight line segment 136 and a slide groove 131 of an inclined line segment 137;

in the oblique line segment 137 ascending upward of the movable pin 14, the length of the upper oblique side is greater than that of the lower oblique side; in the downward sloping line segment 137 of the movable pin 14, the length of the upper sloping side is smaller than that of the lower sloping side; so that the movable pin 14 drives the reducing limiting mechanism 13 to rotate on the outer wall of the core sleeve assembly. I.e., each reciprocation of the core-sleeve assembly, i.e., advancement of the movable pin 14 one station to the left in fig. 4, i.e., to the previous straight segment 136. Fig. 4 is an expanded view of a circumferential surface, i.e., it should be understood that the left and right sides of fig. 4 are connected end to end.

In preferred schemes 3 and 4, two ends of the reducing limiting mechanism 13 are connected with the core sleeve assembly through bearings, and one end of the reducing limiting mechanism is pressed tightly through a bearing seat 15. In this example, the bearing block 15 is threadedly connected to the outer wall of the middle sub 17.

In a preferred scheme, as shown in fig. 1 to 3, a plurality of raised spiral wing surfaces 102 are arranged on the outer wall of the shell, the spiral wing surfaces 102 are distributed along the circumference, a spiral groove 103 is arranged between the spiral wing surfaces 102, the spiral angle of the spiral groove 103 is designed to be a lead angle which is most beneficial to mud circulation and chip removal in the use process of a tool, a radial piston 11 is arranged on the surface of each spiral wing surface 102, and each spiral wing surface 102 is provided with a plurality of radial pistons 11. The outer surfaces of the helical airfoil surface 102 and the radial piston 11 are embedded with ceramic plates or hard alloy plates for wear-resisting treatment.

In a preferred embodiment, as shown in fig. 3, the radial piston 11 is connected to the ramp body 10 through a dovetail groove 29 structure, and the dovetail groove 29 is arranged along the slope of the ramp body 10. With this structure, sliding and retraction of the radial piston 11 can be facilitated.

In a preferred scheme, as shown in fig. 2, a push cover 2 is arranged at the top of the core sleeve assembly, and the upper end face of the push cover 2 forms a structure of a piston end face and is used for driving the core sleeve assembly to move downwards; preferably, a ceramic or alloy layer is arranged on the upper end surface of the push cover 2 to improve the wear resistance.

A second spring 19 is provided between the core-casing assembly and the housing 1 to return the core-casing assembly upwards.

In a preferred scheme, as shown in fig. 2 and 3, a buffer device is further arranged between the core sleeve assembly and the shell 1, and the buffer device has a structure that a clamping jaw body 4 is arranged between the core sleeve assembly and the shell 1, a plurality of cantilevers 402 are arranged on the clamping jaw body 4, a terrace with edge 401 is arranged at the free end of each cantilever 402, a limiting groove 101 for accommodating the terrace with edge 401 is arranged on the inner wall of the shell 1, when the terrace with edge 401 is positioned in the limiting groove 101, the clamping jaw body 4 is axially limited, an avoidance cavity 302 is arranged at the position of the outer wall of the core sleeve 3, which corresponds to the terrace with edge 401, and when the avoidance cavity 302 descends to the terrace with edge 401, the terrace with edge 401 is separated from the limiting groove 101, and the axial limiting of the clamping jaw body 4 is released;

in the core sleeve component, a core sleeve 3 is sleeved with an upper mandrel 6 in a sliding manner, the upper mandrel 6 is fixedly connected with a plurality of inclined plane bodies 10, and a limiting mechanism which slides relatively is arranged between the core sleeve 3 or a clamping jaw body 4 and 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 along the axial direction;

a first spring 7 is arranged between the bottom of the core sleeve 3 and the shell 1.

In a preferred scheme, as shown in fig. 2, a spring seat 8 is arranged at the bottom of the first spring 7, and the spring seat 8 is connected with the upper mandrel 6 in a relatively axially movable and non-rotatable manner; such as a spline connection.

In a preferred scheme, the spring seat 8 is fixedly connected with the shell 1 through a fixing pin 9, and the fixing pin 9 penetrates through the space between the spring seat 8 and the upper mandrel 6 and is connected in a non-rotatable mode in a relatively movable axial direction. Namely, the spring seat 8 is connected with the upper mandrel 6 in a spline mode, the end of the fixing 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 rotation of the upper mandrel 6, so that the structure is favorable for reducing sliding friction force.

Preferably, as shown in fig. 2, the cantilever 402 extends in 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 ledge 401. This scheme is preferably employed in this example.

In the preferred scheme, upper portion dabber 6 and middle part nipple joint 17 fixed connection, reducing stop gear 13 rotatable setting is at middle part nipple joint 17 outer wall to along with middle part nipple joint 17 along axial displacement.

In the preferred scheme, the middle short section 17 is fixedly connected with the lower mandrel 18, the bottom of the lower mandrel 18 is provided with a tapered opening 181, the top caliber of the tapered opening 181 is smaller, and the bottom caliber is larger;

the bottom of the shell 1 is provided with a lower connector 23, a signal valve 22 is arranged in the center of the lower connector 23, the signal valve 22 comprises a conical head positioned in the center, a plurality of axial through-flow passages are arranged at the positions, close to the edges, of the conical head, liquid media flow through the periphery of the conical head, the conical head of the signal valve 22 is matched with the conical opening 181, the through-flow section between the conical head and the conical opening 181 is changed through the axial displacement of the core sleeve assembly, and the pressure of the liquid media is changed. The position of the radial piston 11 can be obtained by monitoring the pressure of the liquid medium and comparing the pressure values at a plurality of different positions, and generally, the longer the extending stroke of the radial piston 11 is, the larger the increase amplitude of the pressure value of the liquid medium is.

In a preferable scheme, an axial sliding groove 601 is arranged on the outer wall of the upper mandrel 6, a pin 5 is fixedly arranged on the core sleeve 3 or the jaw body 4, the pin 5 slides in the sliding groove 601, and drives the upper mandrel 6 to move downwards at the lower stroke limit position.

The connection of the core housing 3 to the upper mandrel 6 is shown in figure 2. The upper mandrel 6 is provided with a sliding groove 601, the position of the mandrel sleeve 3 close to the bottom is provided with a pin 5, and the pin 5 slides in the sliding groove 601. The core housing 3 compresses the first spring 7 first, the upper core shaft 6 does not follow up at this time, and the core housing 3 needs sufficient axial thrust to overcome the locking force between the jaw body 4 and the inner wall of the housing 1, so that the scheme can overcome the interference caused by small fluctuation. When the core sleeve 3 runs sufficiently and the pin 5 contacts the bottom of the sliding groove 601, the upper core shaft 6 is driven to descend, i.e. the ramp 10 is driven to descend, and the radial piston 11 starts to extend.

The connection between the jaw body 4 and the upper spindle 6 is shown in fig. 5. In fig. 5, the core sleeve 3 is provided with an avoiding chute 303, one end of the pin 5 is fixedly connected with the bottom of the jaw body 4, and the other end passes through the avoiding chute 303 to be slidably connected with a chute 601 of the upper mandrel 6. When the clamping jaw is used, the core sleeve 3 compresses the first spring 7, the upper core shaft 6 and the clamping jaw body 4 cannot follow up until the stroke is enough, so that the clamping jaw body 4 starts to move downwards, the prismoid 401 is located at a position avoiding the cavity 302, and the prismoid 401 continues to move downwards and is separated from the limiting groove 101 of the shell 1. At this time, the jaw body 4 continues to move downward, and after the pin 5 contacts the bottom of the sliding groove 601, the upper mandrel 6 is driven to move downward, that is, the inclined plane body 10 is driven to move downward, and the radial piston 11 starts to extend out.

In a preferred scheme, as shown in fig. 2, the relative movement stroke between the upper mandrel 6 and the core sleeve 3 or the jaw body 4 is larger than the movement stroke of the axial movement of the core sleeve 3 to enable the ridge 401 of the jaw body 4 to be disengaged from the limiting groove 101.

In the preferred scheme, a pressure relief hole 301 is formed in the position, close to the top, of the core sleeve 3, an annular groove is formed in the inner wall of the core sleeve 3, the pressure relief hole 301 is communicated with the annular groove, and the pressure relief hole 301 is used for eliminating pressure build-up between the core sleeve 3 and the shell 1.

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

the second sealed chamber 162 is communicated with the outside through a filter plug 20; the outside world here refers to the annular space outside the tool, inside the well.

The balance piston 16 is used for compensating the volume change of the cavity after the radial piston 11 expands and contracts radially and realizing the pressure balance between the cavity and the outside.

Example 2:

the present invention is specifically described in an optimum structure as shown in fig. 1, 3 to 5.

The invention comprises a shell 1 and a core sleeve assembly, wherein the middle part of the shell 1 is provided with spiral wing surfaces 102, a spiral groove 103 is arranged between the spiral wing surfaces 102, four radial pistons 11 are arranged on the spiral wing surfaces 102 from top to bottom, the bottom of the shell 1 is fixedly connected with a lower joint 23, a signal valve 22 is arranged in the lower joint 23, the signal valve 22 is provided with a conical head, and a plurality of through flow holes are arranged around the conical head of the signal valve 22.

The core sleeve component is provided with a push cover 2, a core sleeve 3, an upper mandrel 6, a middle short section 17 and a lower mandrel 18 from top to bottom, and the middle of the whole core sleeve component is communicated so as to facilitate the passing of liquid media, usually slurry. The top end surface of the push cap 2 also constitutes a piston structure due to the pressure drop. 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 shell 1 through a first seal ring 24. The push cover 2 is sleeved in the core sleeve 3 and is connected with the core sleeve through threads. The jack catch body 4 sets up between core cover 3 and shell 1, and the terrace with edge 401 card of the jack catch body 4 is in the spacing groove 101 of shell 1 inner wall, because the space is limited, is blocked by the outer wall of core cover 3, and terrace with edge 401 can not deviate from, realizes spacingly. 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 which is in sealing sliding connection with the inner wall of the upper mandrel 6. A pressure relief hole 301 is formed in one side of a step of the inner wall of the core sleeve 3 at a position close to the upper end of the upper mandrel 6, and is used for discharging hydraulic oil at the upper end of the upper mandrel 6 when the relative distance between the core sleeve 3 and the upper mandrel 6 is changed. This structure also has a buffering effect. As shown in fig. 5, one end of the pin 5 is connected to the bottom of the pawl body 4, and the other end thereof slidably passes through the avoiding chute 303 and is slidably connected to the chute 601. The bottom of the core sleeve 3 is contacted with the first spring 7, the bottom of the first spring 7 is contacted with the spring seat 8, and the spring seat 8 is connected with the upper core shaft 6 in a spline mode through the spline section 81. The spring plate 8 is fixedly connected to the housing 1 by means of a plurality of fixing pins 9. The bottom of the spring seat 8 is in contact with a plurality of inclined bodies 10, the inclined body 10 at the top is in contact with the spring seat 8 and a shaft shoulder of the upper mandrel 6 at the same time, the spring seat 8 is used for stroke limitation, and the shaft shoulder of the upper mandrel 6 is used for pushing the inclined body 10 to go down. An oil passage is further arranged on the shell 1 and is used for enabling hydraulic oil to pass through and playing a role in lubrication. The inclined surface of the inclined surface body 10 is provided with a dovetail groove which is connected with the radial piston 11 through the dovetail groove. The bottom of the upper mandrel 6 is in threaded connection with the middle short section 17 through a third threaded section 171, a shoulder is arranged on the outer wall of the middle short section 17 and is provided with a thrust bearing 12, a reducing limiting mechanism 13 is arranged below the thrust bearing 12, and another thrust bearing 12 is arranged below the reducing limiting mechanism 13. The bottom of the thrust bearing 12 is provided with a bearing seat 15. The surface of the reducing limiting mechanism 13 is provided with a slide rail groove 131, the movable pin 14 is fixedly connected with the shell 1, and the movable pin 14 slides in the slide rail groove 131. A balance piston 16 is arranged in the cavity below the bearing seat 15, the inner wall and the outer wall of the balance piston 16 are both provided with a second sealing ring 25 to form a sealing structure, and hydraulic oil is filled in the first sealing cavity 161 above the balance piston 16. The bottom of the middle short section 17 is fixedly connected with the lower mandrel 18 through threads, and the bottom of the middle short section 17 and the lower mandrel 18 form a seal through a third sealing ring 26. A filter plug 20 is provided on the housing 1 at the location of the second sealed chamber 162 to equalize the pressure. The outer wall of the lower mandrel 18 is provided with a shoulder and a through hole, the bottom of the shoulder is in contact with the second spring 19, the bottom of the second spring 19 is in contact with a baffle ring 21, the baffle ring 21 is sleeved with a lower joint 23, and the signal valve 22 is positioned in the middle of the baffle ring 21. The bottom of the lower mandrel 18 is provided with a tapered opening 181, and the tapered opening 181 is opposite to the signal valve 22.

Example 3:

on the basis of the embodiments 1 and 2, the control method adopting the remote-control variable-diameter stabilizer comprises the following steps:

as shown in fig. 2 and 5, S1, starting the liquid pump for the first time to make the liquid medium reach a preset pressure, pushing the core sleeve assembly to move downward, buffering the core sleeve 3 for a certain distance under the action of the first spring 7, so that the jaw body 4 is separated from the housing 1 until the pin 5 drives the upper mandrel 6 to move downward, the upper mandrel 6 drives the ramp body 10 to move downward, the ramp body 10 ejects the radial piston 11 until the reducing limiting mechanism 13 is limited at the first upper limit position 133 through the movable pin 14, i.e., the core sleeve assembly is limited at the first limit position, at this time, the radial piston 11 is located at the first extension position, and here, because the downward distance of the ramp body 10 is short, the extension stroke of the radial piston 11 is also short;

s2, stopping the liquid pump, resetting the core sleeve assembly under the action of the first spring 7 and the second spring 19, and retracting the radial piston 11 to be flush with the outer surface of the shell 1 under the action of the dovetail groove 29;

s3, starting the liquid pump for the second time to enable the liquid to reach the preset pressure, pushing the core sleeve assembly to descend, ejecting the radial piston 11 by the inclined plane body 10 until the reducing limiting mechanism 13 is limited at a second upper limit position 132 through the movable pin 14, namely limiting the core sleeve assembly at the second limit position, and enabling the radial piston 11 to be located at a second extending position; here, because the inclined body 10 descends for a longer distance, the extending stroke of the radial piston 11 is also longer;

s4, stopping the liquid pump, resetting the core sleeve assembly, and retracting the radial piston 11 to be flush with the outer surface of the shell 1;

by starting and stopping the liquid pump, the switching radial piston 11 is in different extended positions or 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 possible to provide more stroke positions.

A preferred embodiment is shown in fig. 2, comprising the steps of: a conical opening 181 is arranged at the bottom of the core sleeve assembly, the signal valve 22 is fixedly connected with the shell 1 at a position opposite to the conical opening 181, and a conical head is arranged at the top of the signal valve 22; when the core sleeve assembly is located at different extreme positions, the through-flow section between the conical opening 181 and the conical head changes, and the change of the through-flow section affects the pressure value of the liquid medium; in steps S1 and S3, the radial position of the radial piston 11 is determined by detecting the pressure value of the liquid medium.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (10)

1. A remote control reducing stabilizer is characterized in that: the device comprises a shell (1), wherein a core sleeve assembly capable of sliding along the axial direction is arranged in the shell (1), the core sleeve assembly is of a through structure, a plurality of inclined plane bodies (10) are arranged on the outer wall of the core sleeve assembly, the inclined plane bodies (10) are in contact with a radial piston (11) movably penetrating through the shell (1), and the radial piston (11) is driven to stretch and retract along the radial direction through the axial movement of the inclined plane bodies (10);

the outer wall of the core sleeve component is provided with a variable diameter limiting mechanism (13) which can rotate and cannot move axially relative to the core sleeve component, the surface of the variable diameter limiting mechanism (13) is provided with a slide rail groove (131), a movable pin (14) is fixedly arranged on the shell (1), and the movable pin (14) is positioned in the slide rail groove (131) to slide so as to limit the displacement stroke of the core sleeve component.

2. The remotely controlled variable diameter stabilizer according to claim 1, wherein: 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.

3. The remotely controlled variable diameter stabilizer according to claim 1, wherein: 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) are arranged in the slide rail groove (131);

wherein the second upper limit (132) has an elevation higher than the elevation of the first upper limit (133), and the second lower limit (134) and the first lower limit (135) have the same elevation;

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 in a staggered mode on a plane perpendicular to the axis, namely 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) are sequentially arranged in a staggered mode along the circumference.

4. The remote variable diameter stabilizer according to claim 3, wherein: 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) are connected through a straight line section (136) and a slide rail groove (131) of an oblique line section (137);

in the oblique line segment (137) going upwards from the movable pin (14), the length of the upper oblique side is greater than that of the lower oblique side; in a downward inclined line segment (137) of the movable pin (14), the length of the upper inclined edge is smaller than that of the lower inclined edge; so that the movable pin (14) drives the reducing limiting mechanism (13) to rotate on the outer wall of the core sleeve assembly.

5. The remotely controlled variable diameter stabilizer according to claim 1, wherein: a plurality of raised spiral wing surfaces (102) are arranged on the outer wall of the shell, the spiral wing surfaces (102) are distributed along the circumference, a spiral groove (103) is arranged between the spiral wing surfaces (102), a radial piston (11) is arranged on the surface of each spiral wing surface (102), and each spiral wing surface (102) is provided with a plurality of radial pistons (11);

the radial piston (11) is structurally connected with the inclined plane body (10) through a dovetail groove (29), and the dovetail groove (29) is arranged along the inclined plane of the inclined plane body (10).

6. The remote variable diameter stabilizer according to claim 1, wherein: the top of the core sleeve component is provided with a push cover (2), and the upper end surface of the push cover (2) forms a structure of a piston end surface and is used for driving the core sleeve component to move downwards;

a second spring (19) is arranged between the core sleeve component and the shell (1) so as to enable the core sleeve component to move upwards and reset.

7. The remotely controlled variable diameter stabilizer according to claim 1, wherein: a buffer device is further arranged between the core sleeve assembly and the shell (1), the buffer device is structurally characterized in that a clamping jaw body (4) is arranged between the core sleeve assembly and the shell (1), a plurality of cantilevers (402) are arranged on the clamping jaw body (4), a terrace (401) is arranged at the free end of each cantilever (402), a limiting groove (101) used for containing the terrace (401) is formed in the inner wall of the shell (1), when the terrace (401) is located in the limiting groove (101), the clamping jaw body (4) is axially limited, an avoidance cavity (302) is arranged at the position, corresponding to the terrace (401), of the outer wall of the core sleeve (3), and when the avoidance cavity (302) descends to the terrace (401), the terrace (401) is separated from the limiting groove (101), and the axial limiting of the clamping jaw body (4) is removed;

in the core sleeve assembly, a core sleeve (3) is in sliding sleeve joint with an upper mandrel (6), the upper mandrel (6) is fixedly connected with a plurality of inclined plane bodies (10), and a limiting mechanism which slides relatively is arranged between the core sleeve (3) or the jaw body (4) and 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 along the axial direction;

a first spring (7) is arranged between the bottom of the core sleeve (3) and the shell (1).

8. The remote variable diameter stabilizer according to claim 7, wherein: a spring seat (8) is arranged at the bottom of the first spring (7), and the spring seat (8) is connected with the upper mandrel (6) in a non-rotatable mode in a manner of relatively moving axially;

the spring seat (8) is fixedly connected with the shell (1) through a fixed pin (9);

the direction of the cantilever (402) extends along the axial direction, the bottom of the cantilever (402) is connected with the jaw body (4), and the top of the cantilever (402) is provided with a frustum pyramid (401);

the outer wall of the upper mandrel (6) is provided with an axial sliding groove (601), the core sleeve (3) is provided with an avoidance sliding groove (303), one end of a pin (5) is fixedly connected with the bottom of the jaw body (4), the other end of the pin penetrates through the avoidance sliding groove (303) to be in sliding connection with the sliding groove (601) of the upper mandrel (6), and the upper mandrel (6) is driven to move downwards at the lower stroke limit position;

the relative motion stroke between the upper mandrel (6) and the jaw body (4) is larger than the motion stroke of the axial movement of the mandrel sleeve (3) to make the prismatic table (401) of the jaw body (4) be separated from the limit groove (101);

the upper mandrel (6) is fixedly connected with the middle short section (17), and the reducing limiting mechanism (13) is rotatably arranged on the outer wall of the middle short section (17) and moves along the axial direction along with the middle short section (17);

the middle short section (17) is fixedly connected with the lower mandrel (18), a conical opening (181) is formed in the bottom of the lower mandrel (18), the caliber of the top of the conical opening (181) is smaller, and the caliber of the bottom of the conical opening is larger;

the bottom of the shell (1) is provided with a lower joint (23), the center of the lower joint (23) is provided with a signal valve (22), the signal valve (22) comprises a conical head positioned in the center, a plurality of axial through-flow channels are arranged at the positions, close to the edges, of the conical head, liquid media flow through the periphery of the conical head, the conical head of the signal valve (22) is matched with the conical opening (181), the through-flow section between the conical head and the conical opening (181) is changed through the axial displacement of the core sleeve assembly, and the pressure of the liquid media is changed.

9. The remotely controlled variable diameter stabilizer according to claim 1, wherein: a pressure relief hole (301) is formed in the position, close to the top, of the core sleeve (3), an annular groove is formed in the inner wall of the core sleeve (3), the pressure relief hole (301) is communicated with the annular groove, and the pressure relief hole (301) is used for eliminating pressure build-up between the core sleeve (3) and the shell (1);

a sealed cavity is formed between the core sleeve assembly and the shell (1), a balance piston (16) is arranged in the cavity, the cavity is divided into a first sealed cavity (161) and a second sealed cavity (162) by the balance piston (16), and a liquid medium is filled in the first sealed cavity (161);

the second sealed cavity (162) is communicated with the outside through a filter plug (20);

the balance piston (16) is used for compensating the volume change of the cavity after the radial piston (11) expands and contracts in the radial direction and realizing the pressure balance between the cavity and the outside.

10. A control method using the remote variable diameter stabilizer of any one of claims 1 to 9, which is characterized by comprising the following steps:

s1, starting a liquid pump for the first time to enable a liquid medium to reach a preset pressure, pushing a core sleeve assembly to descend, ejecting a radial piston (11) by an inclined plane body (10) until a diameter-changing limiting mechanism (13) limits the core sleeve assembly at a first limit position through a movable pin (14), and enabling the radial piston (11) to be located at the first extending position;

a conical opening (181) is formed in the bottom of the core sleeve assembly, a signal valve (22) is fixedly connected with the shell (1) at a position opposite to the conical opening (181), and a conical head is arranged at the top of the signal valve (22);

when the core sleeve assembly is positioned at different extreme positions, the through-flow section between the conical opening (181) and the conical head is changed, and the change of the through-flow section influences the pressure value of the liquid medium;

the radial position of the radial piston (11) is judged by detecting the pressure value of the liquid medium;

s2, stopping the liquid pump, resetting the core sleeve assembly, and enabling the radial piston (11) to retract to be flush with the outer surface of the shell (1);

s3, starting the liquid pump for the second time to enable the liquid to reach the preset pressure, pushing the core sleeve assembly to descend, ejecting the radial piston (11) by the inclined plane body (10) until the diameter-changing limiting mechanism (13) limits the core sleeve assembly at a second limit position through the movable pin (14), and enabling the radial piston (11) to be located at the second extending position;

s4, stopping the liquid pump, resetting the core sleeve assembly, and enabling the radial piston (11) to retract to be flush with the outer surface of the shell (1);

by starting and stopping the liquid pump, the switching radial pistons (11) are in different extended positions or flush with the surface of the housing (1).

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