CN110295863B

CN110295863B - Double-layer eight-arm sidewall contact device

Info

Publication number: CN110295863B
Application number: CN201910596108.4A
Authority: CN
Inventors: 王少斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2021-07-20
Anticipated expiration: 2039-07-03
Also published as: CN110295863A

Abstract

The invention provides a double-layer eight-arm sidewall contact device which comprises a cylindrical main body, wherein a high-pressure oil cavity and an electric pump are installed at one end of the main body, a front group of pushing arms and a rear group of pushing arms are axially arranged on the main body at intervals, each group of pushing arms are uniformly distributed on the outer circumference of the main body, the front group of pushing arms and the rear group of pushing arms are staggered in the radial direction, a push rod connected with each pushing arm is arranged on the main body, an elastic piece is sleeved on each push rod, and a piston sleeve which drives the push rod to move by extruding the elastic piece is arranged in the high-pressure oil cavity. According to the invention, the push rod is applied with pushing force and pulling force through the elastic piece by the piston sleeve, so that the force applied to each pushing arm is elastically adjustable, and each pushing arm can automatically adjust the unfolding angle according to the distance between the pushing arm and the well wall, so that each pushing arm can be abutted against the well wall, and the support stability of the pusher is greatly improved.

Description

Double-layer eight-arm sidewall contact device

Technical Field

The invention relates to a sidewall contact device for mounting an oil exploration instrument, in particular to an eight-arm sidewall contact device which utilizes a front layer of sidewall contact arm and a rear layer of sidewall contact arm to form an underground multi-angle self-stabilizing supporting structure.

Background

With the development of the oil industry, the oil exploitation and exploration technology is also continuously updated, and a stratum sampling instrument is an important component of exploration equipment in the oil exploration field and is used for measuring various data, such as inclination, of a current well. Formation sampling instruments are typically mounted on a sidewall ram that can be supported at a desired location downhole at any time.

The existing push-leaning device is generally supported underground by a circle of extensible push-leaning arms which are arranged on a main body of the push-leaning device in a surrounding mode, the more the number of the push-leaning arms is, the more stable the support is, but the more the number is, the complexity and the manufacturing difficulty are increased, and therefore the existing push-leaning device is generally in a structure of six push-leaning arms.

In addition, in the aspect of pushing power, the conventional sidewall contact device generally adopts a push rod to directly push a backup arm to stretch, hydraulic power is directly applied to the backup arm, the structure can provide enough support strength, but the stress of each backup arm is the same, namely the extension of each backup arm is synchronous, in this way, once a certain backup arm is contacted with a well wall in advance or is clamped, the push rod can continuously apply rigid thrust to the backup arm, so that the backup arm can bear larger thrust than other backup arms, and under the condition that the shape can not be adjusted, the pressure on each connecting point is increased, and the sidewall contact device is easy to damage. Similarly, when a certain backup arm is stuck by sundries in the contraction process, the push rod can be continuously and rigidly pulled, and the backup arm is easy to damage.

Disclosure of Invention

The invention aims to provide a double-layer eight-arm sidewall contact device which utilizes a front double-layer sidewall contact arm and a rear double-layer sidewall contact arm to form an underground multi-angle self-stabilizing supporting structure.

The double-layer eight-arm sidewall contact device comprises a cylindrical main body, wherein a central channel is arranged in the inner axial direction, a high-pressure oil cavity is mounted at one end of the main body, an electric pump is connected with the high-pressure oil cavity through a cable, a front group of pushing arms and a rear group of pushing arms are arranged on the main body at intervals along the axial direction relative to one end of the high-pressure oil cavity, each group of pushing arms are uniformly distributed on the outer circumference of the main body, the front group of pushing arms and the rear group of pushing arms are staggered in the radial direction, each pushing arm forms a rotatable parallelogram in the axial direction of the main body, a push rod connected with each pushing arm is arranged at one end, located in the high-pressure oil cavity, of the main body, an elastic piece is sleeved on each push rod, and a piston sleeve which drives the push rods to move through extruding the elastic piece is arranged in the high-pressure oil cavity.

In an embodiment of the present invention, a pushing cavity for the piston sleeve to move is disposed at one end of the main body close to the high-pressure oil cavity, and accommodating grooves for accommodating each of the push rods are disposed around the central channel, through holes corresponding to each of the push rods are disposed on the piston sleeve, one end of each of the push rods passes through the through hole and is located in the pushing cavity, the other end of each of the push rods passes through the accommodating groove and is movably connected to the backup arm, and the elastic members are disposed on rod bodies of the push rods located at two sides of the through hole respectively.

In one embodiment of the present invention, the elastic member is a disc spring, and a diameter protrusion section for blocking the movement of the disc spring is provided on the push rod.

In one embodiment of the invention, a displacement sensor for measuring the stroke of each push rod and a force sensor for measuring the thrust of the piston sleeve are arranged at the high-pressure oil cavity.

In one embodiment of the invention, the leaning arm comprises a front arm, a pole plate and a rear arm which are movably connected in sequence, the front arm and the rear arm are parallel after connection, the movable included angle of the front arm relative to the main body is 0-45 degrees, and the pole plate deflects 15 degrees left and right relative to the axis of the pole plate.

In one embodiment of the invention, one surface of the polar plate facing the well wall is of a convex cambered surface structure, the integral corner is of an arc shape, one end of the polar plate connected with the front arm is provided with a connecting pipe, and a polar plate joint communicated with a base plate in the polar plate is arranged in the connecting pipe;

a drive-by-wire joint connected with the internal circuit of the central channel and an oil line adapter seat conveniently connected with the drive-by-wire joint are respectively arranged on the main substrate and opposite to each pushing arm;

the polar plate connects with the oil line adapter connects through the inside rubber line that holds oil and cable simultaneously, be provided with on the forearm and hold the recess of rubber line.

In an embodiment of the invention, the oil line adapter comprises a body, socket ends arranged at two ends of the body and connected with the line control connector in an inserting manner, and pin ends used for connecting the rubber pipeline in an inserting manner, wherein the socket ends and the pin ends are of an eight-core structure for realizing oil path channels and multi-line independent conveying.

In one embodiment of the present invention, the drive-by-wire joint connected to the front set of the backup arms is located downstream of a forearm connection point of the backup arm to which it is connected, and after the oil line adapter connected to the drive-by-wire joint is installed, the pin end thereof is located upstream of the forearm connection point; the opening direction of the socket end after installation is vertical to the main body, and the opening direction of the pin end faces the forearm connecting point.

In one embodiment of the invention, the drive-by-wire joint connected with the rear group of the backup arms is positioned at the upstream of a front arm connecting point of the backup arms, and after the oil line adapter connected with the drive-by-wire joint is installed, the pin end is positioned between the drive-by-wire joint and the front arm connecting point; the opening direction of the socket end is perpendicular to the main body, and the opening direction of the pin end faces to a forearm connecting point of the pushing arm.

In one embodiment of the invention, the rubber pipeline comprises a rubber pipe for accommodating a cable and hydraulic oil, and matching connectors arranged at two ends of the rubber pipe and respectively spliced with the pole plate connector and the pin end of the oil line adapter.

The backup arms are arranged on the backup device in a front-back two-group mode, so that the manufacturing difficulty can be reduced, the supporting strength can be improved, the two groups of backup arms can be driven to synchronously stretch and retract through one end of power, the control is convenient, and the manufacturing difficulty is reduced.

According to the invention, the push rod is applied with pushing force and pulling force through the elastic piece by the piston sleeve, so that the force applied to each pushing arm is elastically adjustable, and each pushing arm can automatically adjust the unfolding angle according to the distance between the pushing arm and the well wall, so that each pushing arm can be abutted against the well wall, and the support stability of the pusher is greatly improved. And moreover, elastic thrust is adopted, so that each pushing arm is always in an elastic state in the abutting process, the respective supporting distance and the supporting strength can be automatically adjusted according to the contact distance between each pushing arm and the well wall and the abutting force, the rigid bearing capacity of each pushing arm is reduced, and the service life is prolonged.

Drawings

FIG. 1 is a schematic diagram of a multi-arm sidewall contact device according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of the deployment of the trailing set of sidewall thrusters in one embodiment of the invention;

FIG. 3 is a left side view of the multi-arm pusher of FIG. 1;

FIG. 4 is a schematic illustration of a piston sleeve configuration in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of the installation location of an oil line adapter in one embodiment of the present invention;

FIG. 6 is a front view of a front wick adapter in accordance with one embodiment of the present invention;

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a schematic view of an eight core configuration of the hub end in accordance with one embodiment of the present invention;

FIG. 9 is a schematic view of a pin end octal corresponding to FIG. 8;

FIG. 10 is a front view of the rear wick adapter in one embodiment of the present invention;

fig. 11 is a perspective view of fig. 10.

Detailed Description

As shown in fig. 1 and 2, one embodiment of the present invention provides a double-layer eight-arm sidewall contact device, the multiple-arm sidewall contact device comprises a columnar main body 1, a central channel 101 is arranged inside the main body 1 along the axis, the central channel 101 is used for flowing hydraulic oil and passing through a control cable, a high-pressure oil chamber 10 for providing high-pressure hydraulic oil is installed at one end of the main body 1, the high-pressure oil chamber 10 is connected with an electric pump 11 through a cable and an oil pipe, and the electric pump 11 comprises a bidirectional motor 111 for providing power and a bidirectional plunger pump 112 for realizing high pressure.

On the main body 1, one end of the high-pressure oil chamber 10 is used as a comparison point, a front group of the pushing arms 201 and a rear group of the pushing arms 202 are arranged at intervals along the axial direction of the main body 1, each group of the pushing

arms

201 and 202 is uniformly distributed on the outer circumference of the main body 1, the front group of the pushing arms 201 and the rear group of the pushing arms 202 are staggered in the radial direction, namely, the supporting point of each pushing arm 20 and the well wall is not overlapped in the axial direction, each pushing arm 20 can rotate in the axial direction of the main body 1 to realize extension and contraction, and after the extension, the main body 1 forms a parallelogram.

The main body 1 is provided with push rods 30 at one end near the high-pressure oil chamber 10, the push rods 30 are respectively connected with each push arm 20, the push rods 30 are uniformly distributed around the central channel 101, the push rods 30 are divided into short push rods 301 connected with the front group of push devices 201 and long push rods 302 connected with the rear group of push devices 202, the short push rods 301 and the long push rods 302 are arranged at intervals in the axial direction of the main body 1, each push rod 30 is respectively sleeved with an elastic part 31, a piston sleeve 12 which is extruded by high-pressure hydraulic oil and simultaneously pushes all the push rods 30 to move is arranged in the high-pressure oil chamber 10, one end of the piston sleeve 12 near the push rods 30 is sleeved outside the central channel 101, and the piston sleeve drives all the push rods 30 to horizontally move by extruding the elastic part 31 in the moving process.

When the pusher is placed underground, the underground electric pump 11 can be controlled by the ground to work, a motor 111 in the electric pump 11 drives a plunger pump 112 to rotate, the plunger pump 112 is respectively communicated with an extrusion cavity 13 and a contraction cavity 14 which are separated by a piston sleeve 12 in a high-pressure oil cavity 10 through an oil pipe 113, and the bidirectional motor 111 drives the plunger pump 112 to respectively control hydraulic oil in the extrusion cavity 13 and the contraction cavity 14 to drive the piston sleeve 12 to move when rotating forwards and backwards.

When the pressure of the hydraulic oil in the extrusion cavity 13 is increased, the piston sleeve 12 is pushed to move towards the contraction cavity 14, the piston sleeve 12 extrudes the elastic part 31 on each push rod 30 in the moving process, the elastic part 31 indirectly pushes the push rod 30 to move towards the end far away from the high-pressure oil cavity 10 through the elastic force, each push arm 20 is in the contraction state and is positioned in the installation groove 105 on the outer circumference of the main body 1 in the normal state, when the push rod 30 moves, the push arm 20 is pushed through the connecting point with each push arm 20, each push arm 20 in the front and rear groups of

push arms

201 and 202 starts to rotate by taking the connecting point with the main body 1 as a fulcrum, and each rotated push arm 20 leaves the installation groove 105 and expands towards the direction far away from the main body 1 until the piston sleeve touches the well wall respectively.

After the predetermined measurement purpose is completed, the motor 111 is controlled to rotate reversely and drive the plunger pump 112 to rotate reversely at the same time, at this time, the oil is injected into the contraction cavity 14 and the oil is discharged from the extrusion cavity 13, so that the piston sleeve 12 moves towards one end of the high-pressure oil cavity 10, the piston sleeve 12 drives the push rod 30 to retract through the elastic member 31 when moving, and each of the pushing arms 20 also rotates towards the main body 1 gradually under the pulling of the push rod 30 until the pushing arms retract into the installation groove 105 of the main body 1.

In this embodiment, the piston sleeve 12 applies pushing and pulling force to the push rods 30 through the elastic members 31, so that the force applied to each of the push arms 20 is elastically adjustable, for example, when a certain push arm 20 contacts the well wall and cannot be extended further, the push arm 20 itself is pushed against and cannot prevent the piston sleeve 12 from moving, the piston sleeve 12 further moves forward to press the elastic members 31, so that other push arms 20 are extended further until all the push arms 20 contact the well wall or reach the pressing limit of the elastic members 31, and in the process, for the push arms 20 which completely contact the well wall, the movement of the piston sleeve 12 can further press the elastic members 31 on the push rods 30 by the compression amount, so as to indirectly and elastically increase the supporting strength of the push arms 20 on the well wall without generating direct pressing on the hard push arms 20.

Therefore, each backup arm 20 in the embodiment can automatically adjust the expansion angle according to the distance between the backup arm 20 and the well wall, so that each backup arm 20 can be abutted against the well wall, and the support stability of the backup device is greatly improved. And adopt elastic thrust for each arm 20 is in the elastic force control all the time at the butt in-process, can adjust respective support distance and support intensity by oneself according to the contact distance and the butt power size of every arm 20 and the wall of a well, reduces the rigid damage of each arm 20, improves life.

By adopting the structure of the front and rear pushing

arms

201 and 202, the manufacturing process of the main body 1 can be simplified, the extended main body 1 can increase the measurement distance, a plurality of measurement purposes can be realized, the measurement precision is improved, and the measurement error caused by movement is reduced.

As shown in fig. 3, in the present embodiment, four sets of the

abutment arms

201 and 202 are provided on the outer circumference of the main base body 1 at intervals of 90 degrees, and eight sets of the

abutment arms

201 and 202 are provided in the front and rear, and are shifted by 45 degrees in the radial direction; and the maximum inclination angle of each of the push arms 20 with respect to the main body 1 is 45 degrees, which is the opposite end to the high-pressure oil chamber 10. The elastic member 31 may be a spring or a disc spring.

In one embodiment of the present invention, in order to facilitate the pushing of each push rod 30, the main body 1 is provided with an annular pushing cavity 102 at an end close to the high-pressure oil chamber 10 for the piston sleeve 12 to move, the pushing cavity 102 is a cavity formed around the central passage 101 so that the piston sleeve 12 can move freely in the stroke along the axial direction of the central passage 101, and in order to limit the movement of each push rod 30 in the radial direction, receiving grooves 103 are uniformly formed around the central passage 101 in the interior of the main body 1 for respectively receiving each push rod 30, and each receiving groove 103 extends in the length direction at least to the connecting point of the push arms 20 to which it is connected.

As shown in fig. 4, in order to facilitate pushing the elastic element 31 without affecting the push rods 30, a radially protruding piston ring 121 is disposed on an outer circumference of the piston sleeve 12, a through hole 122 is disposed on a position of the piston ring 121 corresponding to each push rod 30, one end of each push rod 30 is inserted into the receiving groove 103 with a corresponding length and connected to the corresponding push arms 20, the other end of each push rod 30 is disposed in the push cavity 102 and inserted into the corresponding through hole 122 of the piston ring 121, the elastic element 31 is respectively sleeved on both sides of each push rod 30 at the through hole 122 (the elastic element is replaced by a disc spring in the following description), and a diameter of the through hole 122 is smaller than a diameter of the disc spring.

In this embodiment, when the piston sleeve 12 moves in the pushing chamber 102, the piston ring 121 pushes the disc spring 31 in the forward direction, so that the disc spring 31 elastically pushes the corresponding push rod 30 to rotate the connected push arm 20. In order to transmit the elastic force of the disc spring 31 to the push rod 30, a diameter convex section 32 or a baffle ring for blocking the disc spring 31 may be disposed on the push rod 30, wherein the disc spring 31 near one end of the push arm 20 may be only located in the push cavity 102, or may extend into the receiving groove 32, and the disc spring 31 near one end of the high-pressure oil chamber 10 is located in the push cavity 102. When the piston sleeve 12 moves towards the pushing arm 20, the piston ring 121 presses the disc spring 31 in the direction to expand the pushing arm 20 driven by the push rod 30, and when the piston sleeve 12 moves towards the high-pressure oil chamber 10, the piston ring 122 presses the disc spring 31 at the end to contract the pushing arm 20 driven by the push rod 30. By adopting the design of the bidirectional disc spring 31, the expansion angle of the backup arms 20 can be automatically adjusted according to actual conditions when the backup arms are expanded and contracted, the expansion or contraction of other backup arms 20 is prevented from being influenced by the clamping of some backup arms 20, the strain capacity of the backup device is improved to the maximum extent, and the influence of accidental influences on the measurement result of an instrument is reduced.

In an embodiment of the present invention, in order to obtain the current state of the backup arm 20, a displacement sensor 33 for measuring the moving distance of each push rod 30 may be disposed at the high-pressure oil chamber 10, and according to the moving distance of the push rod 30 measured by the displacement sensor 33, the current opening angle of each backup arm 20 may be calculated, and then the diameter at the current position downhole may be further calculated, and it may also be determined whether a certain backup arm 20 is abnormally extended.

In addition, a load cell 34 for measuring the thrust of the piston sleeve 12 can be arranged at the high-pressure cavity 10, and the load cell 34 can determine the current supporting strength of the thruster 20 by measuring the moving distance of the piston sleeve 12 to determine the current thrust exerted by the piston sleeve 12 on the thrust arm 20.

The structure of the reclining arm 20 according to the present embodiment may be a structure of a reclining arm that is already used in the related art, or may be a structure including:

the leaning arm 20 is composed of a front arm 21, a pole plate 22 and a rear arm 23 which are movably connected in sequence, wherein the unconnected ends of the front arm 21 and the rear arm 23 are respectively movably connected with the main body 1, the front arm 21 and the rear arm 23 are the same in length and are parallel to each other, the pole plate 22 is always kept parallel to the main body 1, and a parallelogram shape is formed when the leaning arm 20 is opened. In the present embodiment, the rotation angle of the front arm 21 and the rear arm 23 with respect to the main body 1 is 0 to 45 degrees, that is, the maximum opening angle of the leaning arm 20 by the pushing of the pushing rod 30 is 45 degrees, forming an inclined parallelogram.

For the convenience of the movement of the push rods 30, each push rod 30 can be movably connected with the leaning arm 20 through a connecting rod 35, the connecting rod 35 is also located in the accommodating groove 103, the connecting rod 35 can finely adjust the power direction transmitted by the push rod 30, and the locking of the push rod 30 and the forearm 21 during linkage is avoided.

In order to facilitate the rotation of the front arm 21 driven by the push rod 30, an extended corner 211 may be provided at the connecting end of the front arm 21 and the main body 1, the corner 211 has an angle with respect to the front arm 21, and the connecting point of the connecting rod 35 is located on the corner 211; when the push rod 30 drives the connecting rod 35 to move, one end of the corner 211 of the front arm 21 is pushed to rotate around the front arm connecting point 212 of the front arm 21 and the main body 1, so that the front arm 21 drives the pole plate 22 and the rear arm 23 to rotate synchronously.

In the present embodiment, only the front arm 21 of the reclining arm 20 is a driving arm, and the rear arm 23 has a passive rotation structure.

In one embodiment of the invention, in order to facilitate the contact of the polar plate 22 with the well wall, the polar plate 22 connected with the front arm 21 and the rear arm 23 can be inclined at a certain angle left and right relative to the axis, and meanwhile, one surface facing the well wall is provided with a convex cambered surface structure, and the integral corner of the polar plate 22 is also provided with an arc shape; after the polar plate 22 contacts with the wall of a well, the contact angle can be automatically adjusted by the cambered surface according to the concave-convex state of the wall of a well, so that a more stable supporting state is formed with the wall of a well, and the supporting effect is further improved. In the present embodiment, the angle of inclination of the pole plate 22 with respect to the axis is plus or minus 15 degrees.

In an embodiment of the present invention, since the corresponding measuring circuit board is generally installed in the plate 22, in order to facilitate transmission of the measuring signal inside the plate 22, a corresponding connection joint 221 may be disposed at the connection end of the plate 22 and the front arm 21 or the rear arm 23 to lead out the internal signal line, and the connection manner of the line inside the plate 22 and the line of the main body 1 will be described below by taking the connection joint 221 disposed near one end of the front arm 21 as an example:

a hollow connection pipe 222 for connecting with the front arm 21 is installed at the end of the plate 22, a plate joint 221 connected with a lead on a circuit board in the plate 22 is installed in the connection pipe 222, and the opening direction of the plate joint 221 faces the front arm 21.

A cable for transmitting signals penetrates through the central channel 101 of the main body 1, a drive-by-wire joint 104 connected with the cable inside the central channel 101 is respectively arranged on the side wall of the main body 1 corresponding to each pushing arm 20, and an oil line adapter 40 for extending the connection point of the drive-by-wire joint 104 is arranged at the same time, wherein the oil line adapter 40 is used for extending the drive-by-wire joint 104, so that the connection position of the oil line adapter and the polar plate 22 can be adjusted according to the structure and the installation space of the main body 1.

As shown in fig. 5, the plate joint 221 needs to move synchronously with the expansion of the plate 22, so when the plate joint is connected with the oil line adapter 40, the connected line needs to have certain bending performance while being capable of moving synchronously with the position change of the plate 22; in the embodiment, the rubber pipeline 24 made of rubber pipes is used for connecting the pole plate joint 221 and the oil line adapter 40, the rubber pipes have certain elasticity and can be bent at will, and hydraulic oil is used for flowing through the rubber pipes and cables are simultaneously threaded through the rubber pipes; the two ends of the rubber pipe are respectively provided with a plug-in connector 241 matched with the pole plate connector 221 and the oil line adapter 40 to form a rubber pipeline 24 for realizing double-end connection; for the convenience of wiring, an axial groove or channel is arranged on the front arm 21, the rubber pipeline 24 is arranged in the groove or channel and can be simultaneously accommodated in the main body 1 along with the contraction of the leaning arm 20, and the matching joints 241 at the two ends of the rubber pipeline extend out of the front arm 21 and then are respectively inserted with the pole plate joint 221 and the oil line adapter 40.

The interior of each pole plate 22, the interior of the rubber pipeline 24 and the connected oil line adapter 40 are filled with hydraulic oil, and the hydraulic oil of the pole plates, the rubber pipeline 24 and the connected oil line adapter 40 is communicated with each other through the rubber pipeline 24. In this embodiment, the hydraulic oil path in each backup arm 20 is isolated from the hydraulic oil in the central channel 101 of the main body 1, and the matching joints 241 at the two ends of the rubber pipeline 24 are matched with the structures of the pole plate joint 221 and the oil line adapter 241, which are inserted into each other, so as to ensure the complete transmission of the cables and the oil paths.

The hydraulic oil is filled in the parts, so that the internal pressure resistance of each part can be improved, the weight of the parts is reduced, and the wall thickness is reduced.

The oil line adapter 40 is an extension socket, and the connection position of the oil line adapter and the rubber pipeline 24 can be adjusted to the position of reducing the bending angle of the oil line adapter as much as possible by extending the connection point of the line control connector 104, so that the phenomenon that the connected rubber pipeline 24 is broken due to the fact that the bending angle is too large to cause the disconnection of an internal circuit or an oil line is avoided.

In addition, because eight push rods 30 are arranged at the front end (the end close to the high-pressure oil chamber 10) of the main body 1, the design space at the front end of the main body 1 is very compact, and cannot accommodate more structures, so that after the matching structure of the oil line adapter 40 is adopted, the drive-by-wire joint 104 can be arranged at a more proper position on the main body 1, and the manufacturing difficulty of the main body 1 is greatly reduced.

As shown in fig. 6 and 7, in an embodiment of the present invention, a specific structure of the oil line adapter 40 is provided, the oil line adapter 40 includes a body 41, a socket end 42 respectively disposed at two ends of the body 41 for being plugged into the line control connector 104, and a pin end 43 for being plugged into the rubber line 24, the body 41 is a block arc, a groove for accommodating the body 41 is disposed on the main body 1, the main body 1 can be kept cylindrical after the body 41 is plugged into the groove, and the body 41 can be fixed by a bolt after being plugged into the groove.

As shown in fig. 8 and 9, the receptacle end 42 and the pin end 43 respectively have an eight-core structure including an oil port 421 and

line ports

422 and 423, where the oil port 421 is one, and the line ports are used to connect different cables, such as a cable 422 and a signal cable 423. In the body 41, an oil passage is provided which communicates the oil passage port 421 on the pin end 43 and the socket end 42, and connection cables of the

line ports

422 and 423 are also passed through the oil passage. The pin end 43 is the same as the socket end 42 in function and structure by only replacing the oil line port 421 and the

line ports

422 and 423 with pin shapes.

After the body 41 is installed on the main body 1, the socket end 42 and the pin end 43 are respectively located in the main body 1, and can be directly plugged with the drive-by-wire connector 104 on the main body 1 and the connector 241 of the rubber pipeline 24 in the installation process.

In the present embodiment, the oil line adapter 40 connecting the front group backup arm 201 and the rear group backup arm 202 has the same basic structure, but the oil line adapter 40 has some differences in detail depending on the installation positions thereof, and the following description will be made of the oil line adapter 40 used for the front group backup arm 201 and the rear group backup arm 202, respectively:

as shown in fig. 6 and 7, the drive-by-wire joint 104 corresponding to the front group of the backup arm 201 is disposed downstream of the front arm connection point 212 of the backup arm 20 so as to avoid the push rods 30 distributed at the front end of the main body 1, the oil line adaptor 40 connected to the drive-by-wire joint 104 is mounted (hereinafter referred to as a front oil line adaptor 401), the socket end 42 is vertically inserted on the drive-by-wire joint 104, the body 41 passes over the front arm connection point 212 so that the pin end 43 extends upstream of the front arm connection point 212, and the opening direction of the mounted pin end 43 faces the front arm connection point 212 and is parallel to the main body 1 (opposite to the socket end 42 at the other end). The mating fitting 241 of the rubber line 24 drawn down from the front arm 21 bypasses the front arm connection point 212 and is then inserted into the pin end 43.

In this structure, the front oil line adapter 401 moves the line control joint 104 connection point located at the downstream of the forearm connection point 212 to the upstream of the forearm connection point 212, and when the backup arm 20 rotates relative to the main body 1, the rubber line 24 bends only within a range of 0 to 45 degrees, and does not affect the internal oil line and the internal circuit. The phenomenon that when the rubber pipeline 24 is directly connected with the drive-by-wire joint 104, the bending angle of the rubber pipeline 24 exceeds 90 degrees, so that the internal oil circuit and the circuit are disconnected is avoided.

As shown in fig. 10 and 11, the drive-by-wire adapter 104 corresponding to the rear set of backup arms 20 is disposed upstream of the corresponding connecting backup arm 20, i.e., upstream of the front arm connection point 212 of the backup arm 20, and the oil line adapter 40 for connecting the drive-by-wire adapter 104 is also mounted upstream of the backup arm 20 (hereinafter referred to as a rear oil line adapter 402), the socket end 42 of the rear oil line adapter 402 to which the drive-by-wire adapter 104 is connected is located at an end away from the backup arm 20, the socket end 42 is vertically connected to the drive-by-wire adapter 104, the pin end 43 is located between the socket end 42 and the front arm connection point 212 of the backup arm 20, the opening of the pin end 43 faces horizontally toward the front arm connection point 212 (opposite to the socket end 42 at the other end), and the adapter 241 of the rubber line 24 extending from the front arm 21 horizontally enters the main body 1 and is connected to the pin end 43. This configuration also prevents the rubber line 24 from bending excessively to block the internal oil passages and lines.

The oil paths of the front group and the rear group of the push arms 20 are respectively connected to the socket ends 42 of the front oil line adapter 401 and the rear oil line adapter 402, namely, the oil paths are disconnected at the line control joint 104, and only the oil paths among the oil line adapter 40, the rubber pipeline 24 and the pole plate 22 are kept smooth.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A double-layer eight-arm sidewall contact device comprises a cylindrical main body provided with a central channel in the inner axial direction, a high-pressure oil cavity mounted at one end of the main body, and an electric pump connected with the high-pressure oil cavity through a cable,

the main body is provided with a front group of pushing arms and a rear group of pushing arms at intervals along the axial direction relative to one end of the high-pressure oil cavity, each group of pushing arms are uniformly distributed on the outer circumference of the main body, the front group of pushing arms and the rear group of pushing arms are staggered in the radial direction, each pushing arm forms a rotatable parallelogram in the axial direction of the main body, one end, located at the high-pressure oil cavity, of the main body is provided with a push rod connected with each pushing arm, an elastic piece is sleeved on each push rod, and a piston sleeve which drives the push rods to move by extruding the elastic piece is arranged in the high-pressure oil cavity;

the leaning arm comprises a front arm, a polar plate and a rear arm which are movably connected in sequence, the front arm and the rear arm are parallel after connection, the movable included angle of the front arm relative to the main body is 0-45 degrees, and the polar plate deflects 15 degrees left and right relative to the axis of the polar plate;

one surface of the polar plate facing the well wall is of an outward convex cambered surface structure, the integral corner is arc-shaped, one end, connected with the front arm, of the polar plate is provided with a connecting pipe, and a polar plate joint communicated with a base plate in the polar plate is arranged in the connecting pipe;

2. The double-layer eight arm sidewall contact device of claim 1,

the main base body is close to the one end of high-pressure oil chamber is provided with the confession the promotion chamber that the piston bush removed, and centers on central channel is provided with and holds every respectively the holding tank of push rod, be provided with respectively on the piston bush with every the through-hole that the push rod corresponds, the one end of push rod is passed be located behind the through-hole promote the intracavity, the other end penetrates behind the holding tank with push arm swing joint, the elastic component sets up respectively the push rod is located on the pole body of through-hole both sides.

3. The double-layer eight arm sidewall contact device of claim 2,

the elastic part is a disc spring, and a diameter convex section for blocking the disc spring to move is arranged on the push rod.

4. The double-layer eight arm sidewall contact device of claim 2,

and a displacement sensor for measuring the stroke of each push rod and a force measuring sensor for measuring the thrust of the piston sleeve are arranged at the high-pressure oil cavity.

5. The double-layer eight arm sidewall contact device of claim 1,

the oil line adapter comprises a body, socket ends and pin ends, wherein the socket ends are arranged at two ends of the body and are connected with the line control connector in an inserting mode, the pin ends are used for connecting the rubber pipelines in an inserting mode, and the socket ends and the pin ends are of eight-core structures for realizing oil line channels and multi-line independent conveying.

6. The double-layer eight arm sidewall contact device of claim 5,

the drive-by-wire joint connected with the front group of the backup arms is positioned at the downstream of a forearm connecting point of the backup arms connected with the drive-by-wire joint, and after the oil line adapter connected with the drive-by-wire joint is installed, the pin end of the oil line adapter is positioned at the upstream of the forearm connecting point; the opening direction of the socket end after installation is vertical to the main body, and the opening direction of the pin end faces the forearm connecting point.

7. The double-layer eight arm sidewall contact device of claim 5,

the drive-by-wire joint connected with the rear group of the backup arms is positioned at the upstream of a front arm connecting point of the backup arms, and after the oil line adapter connected with the drive-by-wire joint is installed, the contact pin end is positioned between the drive-by-wire joint and the front arm connecting point; the opening direction of the socket end is perpendicular to the main body, and the opening direction of the pin end faces to a forearm connecting point of the pushing arm.

8. The double-layer eight arm sidewall contact device of claim 5,

the rubber pipeline comprises a rubber pipe used for containing cables and hydraulic oil and matching connectors arranged at two ends of the rubber pipe and respectively connected with the pole plate connector and the contact pin end of the oil line adapter in an inserting mode.