Casing running device

Abstract

The invention discloses a casing running device. Relates to the technical field of petroleum drilling equipment. Comprising a device body; the execution unit is connected to the lower portion of the device body, and the lower portion of the execution unit can stretch into the sleeve, is distributed in the circumferential direction of the sleeve and abuts against the inner side wall of the sleeve. The motor driving unit is arranged on the device body and can control the lower portion of the execution unit to reciprocate in the sleeve in the radial direction of the sleeve. The casing running device is simple in structure, small in overall size and free of environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling equipment, and particularly to a casing running device. Background Art

[0002] Casing running operation is a very important operation link in drilling engineering. The purpose of casing running operation is to separate strata, reinforce the wellbore, prevent oil and gas leakage, establish an oil and gas flow channel, etc.

[0003] The conventional casing running operation method is to conduct casing running and grouting operations through a large-tonnage elevator, a casing centralizer, a casing tong, and a separate grouting device, etc. However, there are many deficiencies in the conventional casing running operation: the operation process is complex, and the ability to handle casing sticking accidents is low; there are many supporting devices and personnel during operation, the operation efficiency is low, and there are relatively large potential safety hazards, etc., resulting in the continuous increase of oil and gas development costs. Therefore, how to safely and efficiently implement casing running operation and reduce the cost of casing running operation has become the development direction and driving force of casing running operation equipment.

[0004] To solve the above problems, a top drive casing running device has been developed in the prior art. The top drive casing running device includes a drive system assembly, a top drive anti-rotation mechanism assembly, and a slip anti-rotation mechanism assembly. Its operation efficiency is high and the potential safety hazard is small. Therefore, it is often used to replace the above conventional casing running operation method. The top drive casing running device can be divided into a hydraulic drive type and a mechanical drive type according to the form of the driving force received by the slips; for the hydraulic drive type top drive casing running device, the hydraulic oil is prone to leakage and pollute the environment, and the hydraulic system is greatly affected by the external environment, and the supporting hydraulic station has a large volume; while the mechanical top drive casing running device has the disadvantage of complex structure.

[0005] Therefore, there is an urgent need to design a casing running solution with a simple structure, a small overall volume and no environmental pollution. Summary of the Invention

[0006] The purpose of the present invention is to provide a casing running device to solve the problems existing in the above prior art, with a simple structure, a small overall volume and no environmental pollution.

[0007] To achieve the above purpose, the present invention provides the following scheme:

[0008] The present invention provides a casing running device, including:

[0009] A device main body;

[0010] An execution unit, connected below the device main body, the lower part of the execution unit can extend into the casing, is distributed along the circumferential direction of the casing, and abuts against the inner side wall of the casing;

[0011] The motor drive unit is arranged on the device main body and can control the lower part of the execution unit to reciprocate radially in the sleeve. When it can move radially outward along the sleeve, it can move to closely fit the inner wall of the sleeve, realizing the support for the inner wall of the sleeve and maintaining the support state.

[0012] Preferably, the device main body includes a connecting outer cover. A sliding sleeve is fixedly connected to the bottom of the connecting outer cover. A plurality of strip-shaped grooves arranged along the circumferential direction of the sliding sleeve are formed on the side wall of the sliding sleeve, and the upper part of the execution unit can move radially along the corresponding strip-shaped groove.

[0013] Preferably, the execution unit includes a plurality of jaw mechanisms. Each jaw mechanism includes a connecting rod and a slip tile integrally formed. The upper part of the connecting rod is movably arranged in the corresponding strip-shaped groove. One end of the middle part of the connecting rod is connected to the upper part of the connecting rod, and the other end is connected to the lower part of the connecting rod. The middle part of the connecting rod is arranged obliquely inward. The outer side of the lower part of the connecting rod is fixedly connected with the slip tile, and the lower part of the connecting rod can drive the slip tile to extend into the sleeve and abut the slip tile against the inner wall of the sleeve. The motor drive unit can drive the upper part of the connecting rod to move radially along the corresponding strip-shaped groove.

[0014] Preferably, the motor drive unit includes a permanent magnet synchronous motor arranged in the connecting outer cover. The permanent magnet synchronous motor is externally connected to a power supply. A driving gear is fixedly sleeved on the output shaft of the permanent magnet synchronous motor. A piston is sleeved outside the driving gear. Internal threads are arranged on the inner side wall of the piston, and the internal threads are in transmission connection with the driving gear. When the driving gear rotates, it can drive the piston to move axially along the connecting outer cover. A plurality of first inclined surfaces arranged along the circumferential direction of the piston are arranged on the outer side of the piston. The first inclined surfaces are gradually inclined outward from top to bottom. A second inclined surface gradually inclined inward from bottom to top is formed in the inner side of the upper part of the connecting rod, and the first inclined surface abuts against the second inclined surface of the corresponding connecting rod.

[0015] Preferably, the execution unit further includes a main shaft with a hollow interior. The upper part of the main shaft penetrates through the top of the connecting outer cover and is fixedly connected to the connecting outer cover. The lower part of the main shaft passes through the hollow core shaft of the permanent magnet synchronous motor and is connected with a guide joint. A mud through hole communicating with the inside of the main shaft is formed on the guide joint. The guide joint is located in the sleeve and can introduce the mud introduced into the main shaft into the sleeve through the mud through hole. A sealing structure is sleeved at the connection position between the main shaft and the guide joint. The sealing structure can open under the action of the mud pressure in the sleeve and seal the sleeve.

[0016] Preferably, a connection through-hole is formed in the inner side wall of the strip-shaped groove, a waist-shaped hole arranged radially along the sliding sleeve is formed in the upper side wall of the connecting rod, a bolt is fixedly inserted through the connection through-hole, and one end of the bolt is movably inserted into the waist-shaped hole on the corresponding side.

[0017] Preferably, a plurality of external splines are fixedly arranged on the inner side wall of the sliding sleeve, and the external splines are arranged at intervals with the strip-shaped groove; a plurality of internal spline grooves are fixedly formed on the outer side wall of the piston, and the internal spline grooves are arranged at intervals with the first inclined surface, and the external splines are slidably arranged in the corresponding internal spline grooves.

[0018] Preferably, a pressure sensor is fixedly arranged on the first inclined surface, and the pressure sensor is externally connected to a control end.

[0019] Preferably, a connection welding plate is fixedly arranged on the inner side wall of the connection outer cover, and the flange end of the permanent magnet synchronous motor is fixedly connected to the connection welding plate.

[0020] Preferably, the side of the slip that contacts the inner side wall of the casing is provided with slip teeth arranged in a staggered manner.

[0021] The present invention has achieved the following technical effects compared with the prior art:

[0022] The structure of the present invention is simple. The motor drive unit is adopted to realize the supporting effect on the casing during the casing lowering operation, without the need for a hydraulic source, avoiding environmental pollution caused by hydraulic oil leakage; without a supporting hydraulic station, the overall volume of the casing lowering device is small, facilitating transportation; the structure of the present invention is reasonable, the operation is simple and convenient, and the structure is simple, so the processing and manufacturing difficulty can be reduced, and the production cost can be lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the casing lowering device in one or some embodiments of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the sliding sleeve in one or some embodiments of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the piston in one or some embodiments of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the guide joint in one or some embodiments of the present invention;

[0028] Figure 5 Schematic diagram of the drive gear structure in one or some embodiments of the present invention.

[0029] In the figure: 1 - conductive slip ring, 2 - main shaft, 3 - permanent magnet synchronous motor, 4 - connecting housing, 5 - connecting welding plate, 6 - sliding sleeve, 601 - strip groove, 602 - external spline, 7 - piston, 701 - internal spline groove, 702 - first inclined surface, 8 - jaw mechanism, 801 - connecting rod, 802 - slip, 9 - drive gear, 10 - sealing structure, 11 - guiding joint, 1101 - mud through hole, 12 - casing. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] The purpose of the present invention is to provide a casing lowering device to solve the problems existing in the above-mentioned prior art, with a simple structure, a small overall volume and no environmental pollution.

[0032] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the prior art top drive casing lowering device, according to the form of the driving force received by the slip, it can be divided into a hydraulic drive type and a mechanical drive type; in the hydraulic drive type top drive casing lowering device, the hydraulic oil is easy to leak and pollute the environment, and the hydraulic system is greatly affected by the external environment, and the supporting hydraulic station has a large volume; while the mechanical top drive casing lowering device has the disadvantage of a complex structure. To solve this problem, the present invention provides a casing lowering device, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, it includes a device main body; an execution unit is connected below the device main body, and the lower part of the execution unit can extend into the casing 12 and abut against the inner side wall of the casing 12; a motor drive unit is arranged on the device main body and can control the lower part of the execution unit to reciprocate radially along the casing 12. The structure of the present invention is simple. The motor drive unit is adopted to realize the supporting effect on the casing 12 during the operation of lowering the casing 12. There is no need for a hydraulic source, avoiding the pollution of the environment caused by the leakage of hydraulic oil; there is no supporting hydraulic station, making the overall volume of the casing lowering device small and convenient for transportation; the structure of the present invention is reasonable, simple and convenient to operate, and the structure is simple, so the processing and manufacturing difficulty can be reduced and the production cost can be lowered.

[0034] In one embodiment, the device main body includes a connecting outer cover 4. In order to reduce the overall volume of the device, the connecting outer cover 4 in this embodiment is designed as a cylindrical structure, and the bottom of the connecting outer cover 4 is fixedly connected by bolts with a sliding sleeve 6 coaxial with the connecting outer cover 4.

[0035] In order to support the casing 12 during the operation of running in the casing 12, in one embodiment, a plurality of strip-shaped grooves 601 arranged circumferentially along the side wall of the sliding sleeve 6 are provided. The actuating unit includes a plurality of claw mechanisms 8 arranged circumferentially. The claw mechanism 8 includes a connecting rod 801 and a slip 802 integrally formed. The upper part of the connecting rod 801 is movably arranged in the corresponding strip-shaped groove 601. One end of the middle part of the connecting rod 801 is connected to the upper part of the connecting rod 801, and the other end of the middle part of the connecting rod 801 is connected to the lower part of the connecting rod 801; the middle part of the connecting rod 801 is arranged obliquely inward. Therefore, when the upper part of the connecting rod 801 moves radially in the corresponding strip-shaped groove 601, the inclined structure of the middle part of the connecting rod 801 will not interfere with the strip-shaped groove 601; a long strip-shaped slip 802 is fixedly connected to the outer side of the lower part of the connecting rod 801, and the lower part of the connecting rod 801 can drive the slip 802 to extend into the casing 12 and abut the slip 802 against the inner side wall of the casing 12; the motor drive unit can drive the upper part of the connecting rod 801 to move radially along the corresponding strip-shaped groove 601. When the connecting rod 801 moves radially outward, the moving directions of the plurality of circumferentially arranged connecting rods 801 are different, which can enable the plurality of slips 802 to abut against the inner side walls at different positions of the casing 12 along the circumference of the casing 12, so that the whole device of the present invention can fixedly support the casing 12. When the connecting rod 801 moves radially inward, it can enable the slips 802 to move synchronously towards the central axis direction of the casing 12, thereby releasing the supporting effect on the casing 12. The specific principle is that the plurality of slips 802 are on the same virtual circle. When the connecting rod 801 moves outward, the radius of the virtual circle where the plurality of slips 802 are located becomes larger, and the plurality of slips 802 abut against different positions on the inner side wall of the casing 12 along the circumference, which can play a role in supporting the casing 12; in order to make the support for the casing 12 more stable, four claw mechanisms 8 are designed in this embodiment. The four claw mechanisms 8 are arranged circumferentially along the sliding sleeve 6. Similarly, four slips 802 are provided in cooperation with the four claw mechanisms 8 to realize the supporting effect on different circumferential positions of the casing 12.

[0036] In one embodiment, on the side of the slip 802 in contact with the inner side wall of the casing 12, there are alternately arranged slip teeth. The slip teeth include first slip teeth arranged annularly and second slip teeth arranged axially. The first slip teeth and the second slip teeth are alternately arranged. The slip teeth are similar to a raised stripe structure or a toothed structure. The slip 802 is a mature technology, so it will not be elaborated. The slip teeth are in contact with the inner side wall of the casing 12, and the friction force increases, thereby increasing the ability of the device to transmit the top drive torque.

[0037] In order to support the casing 12, in one embodiment, the motor drive unit includes a permanent magnet synchronous motor 3 disposed in the connecting outer cover 4. The permanent magnet synchronous motor 3 is selected because it has high efficiency and power saving. The permanent magnet synchronous motor 3 can be made into multiple stages and has the characteristics of low speed and large torque. The efficiency and power factor of an asynchronous motor are directly related to the load rate, and the power factor of an asynchronous motor is relatively low at a low load rate. The permanent magnet synchronous motor 3 has an operating efficiency of up to 0.9 and a power factor of up to 0.95 at a 10% low load rate, and the permanent magnet synchronous motor 3 has a high efficiency within the rated load range. By taking advantage of the power-saving, low-speed, and large-torque characteristics of the permanent magnet synchronous motor 3, it is ensured that the motor has sufficient torque to ensure the smooth completion of the task of lowering the casing 12. A connecting welding plate 5 is fixedly provided on the inner side wall of the connecting outer cover 4, and the flange end of the permanent magnet synchronous motor 3 is fixedly connected to the connecting welding plate 5; the permanent magnet synchronous motor 3 is externally connected to a power source. In order to achieve the connection with the power source without interfering with the normal rotation requirement of the device of the present invention, in this embodiment, a main shaft 2 with a hollow interior is disposed in the connecting outer cover 4. The upper part of the main shaft 2 penetrates through the top of the connecting outer cover 4 and is fixedly connected to the connecting outer cover 4. A conductive slip ring 1 is sleeved at the position of the main shaft 2 above the connecting outer cover 4. The inner ring of the conductive slip ring 1 is connected to the cable and signal line of the permanent magnet synchronous motor 3, and the outer ring of the conductive slip ring 1 is connected to the externally connected power supply line and signal control line. Thus, through the slip ring structure, during the process of conducting electricity, it can be ensured that the entire device of the present invention can rotate; in order to avoid interference between the installation position of the permanent magnet synchronous motor 3 and the main shaft 2, in this embodiment, the permanent magnet synchronous motor 3 is a permanent magnet motor with a hollow shaft as the rotor. The lower end of the hollow shaft of the rotor is fixedly connected to the driving gear 9 and can drive the driving gear 9 to rotate forward and backward. That is, the core shaft of the permanent magnet synchronous motor 3 in this embodiment is of a hollow structure, and the main shaft 2 can movably pass through the hollow core shaft of the permanent magnet synchronous motor 3; a driving gear 9 is fixedly sleeved on the output shaft of the permanent magnet synchronous motor 3, and a piston 7 is sleeved outside the driving gear 9. The inner side wall of the piston 7 is provided with an internal thread, and the internal thread is in transmission connection with the driving gear 9. When the driving gear 9 rotates, it can drive the piston 7 to move axially along the connecting outer cover 4. The transmission relationship between the internal thread structure of the piston 7 and the driving gear 9 is similar to a nut-screw structure. When the driving gear 9 rotates, the piston 7 connected to it in transmission can move axially up and down. The piston 7 in this embodiment is manufactured by processing a high-strength steel pipe, and the internal thread structure of the piston 7 generally adopts a triangular thread or an arc thread.When the driving gear 9 rotates, the piston 7 will move along the thread helix, thus converting the rotational motion into linear motion (or vice versa); multiple first inclined surfaces 702 are arranged on the outer side of the piston 7 in the circumferential direction of the piston 7, and the outer side of the first inclined surface 702 gradually inclines outward from top to bottom. The inner side of the upper part of the connecting rod 801 is provided with a second inclined surface that gradually inclines inward from bottom to top. The first inclined surface 702 abuts against the corresponding second inclined surface of the connecting rod 801; in this embodiment, the first inclined surface 702 of the piston 7 is a wedge-shaped surface, which is specially treated and wear-resistant. The angle of the wedge-shaped surface is precisely calculated to ensure sufficient tightening force after being matched with the connecting rods 801 of various models. And a pressure sensor is fixedly installed on the wedge-shaped surface. The pressure sensor is externally connected to a control end, and the control end can adopt a mature computer, etc. The mature known control calculation unit of the computer is used to control the forward and reverse rotation of the permanent magnet synchronous motor 3. At the same time, through the pressure sensor between the connecting rod 801 and the piston 7, the tightening force of the chuck mechanism 8 on the inside of the casing 12 can be calculated and monitored, and then the make-up torque can be calculated and the torque value can be recorded.

[0038] In one embodiment, in order to ensure that the piston 7 can only move axially and will not be skewed, multiple external splines 602 are fixedly arranged on the inner side wall of the sliding sleeve 6, and the external splines 602 and the strip-shaped grooves 601 are arranged at intervals; multiple internal spline grooves 701 are fixedly opened on the outer side wall of the piston 7, and the internal spline grooves 701 and the first inclined surfaces 702 are arranged at intervals. The external splines 602 of the sliding sleeve 6 are slidably arranged in the corresponding internal spline grooves 701. Since the piston 7 and the sliding sleeve 6 are in a spline fit structure, when the driving gear 9 rotates, the piston 7 can only move up and down along the key groove. Because the wedge-shaped surface on its outer side contacts the second inclined surface on the upper part of the connecting rod 801, during the axial movement of the piston 7, the first inclined surface 702 can slide along the second inclined surface and push the second inclined surface to move outward, thereby driving the connecting rod 801 to move outward, and then driving the slip 802 to move to tighten the inner wall of the casing 12. When it is necessary to release the casing 12, the permanent magnet synchronous motor 3 can be reversed. After reversal, the abutting force of the first inclined surface 702 of the piston 7 on the chuck mechanism 8 disappears. At this time, the supporting force of the slip 802 on the casing 12 also disappears. Thus, under the action of gravity or by lifting the device of the present invention upward, the casing 12 can be easily separated from the slip 802. The driving gear 9 is processed and manufactured from high-strength steel, and the specific structure is as shown in the three-dimensional view. The thread on the outer side wall of the driving gear 9 is a triangular thread or an arc thread that cooperates with the piston 7.

[0039] The interior of the main shaft 2 in this embodiment is used as a mud channel. The lower part of the main shaft 2 passes through the hollow core shaft of the permanent magnet synchronous motor 3 and is connected with a guide joint 11. A mud through hole 1101 communicating with the interior of the main shaft 2 is formed on the guide joint 11. The upper end of the main shaft 2 is threadedly connected to the shaft of the top drive device, and the flange end face of the main shaft 2 is fixedly connected to the upper end face of the connecting outer cover 4 by bolts. The main shaft 2 is the main load-bearing component of the top drive casing running device and is forged from high-strength alloy steel. Generally, the material is 40CrNi2MoA steel. The thread at the upper end of the main shaft 2 is a 6-5 / 8REG tapered thread, and the surface of this thread is phosphated to enhance its corrosion resistance and wear resistance. The guide joint 11 is located inside the sleeve and can introduce the mud introduced into the main shaft 2 into the sleeve through the mud through hole 1101. A sealing structure 10 is sleeved at the connection position between the main shaft 2 and the guide joint 11. The sealing structure 10 is a leather cup. When encountering high-pressure mud, it can be expanded to make its side wall closely adhere to the inner wall of the casing 12 to prevent the overflow of the mud inside the casing 12. The guide joint 11 is located at the lowermost end of the main shaft 2. Its specific structure is as shown in the figure. The guide joint 11 is a tapered structure with a threaded hole in the middle and is threadedly connected to the bottom of the main shaft 2 through the threaded hole. Four mud through holes 1101 are evenly distributed around the guide joint 11 and are mud outlet channels, which can introduce the mud introduced into the main shaft 2 into the casing 12 through the mud port channel. The guide joint 11 is at the lowermost end of the entire top drive casing running device and plays a guiding role when the device penetrates into the casing 12.

[0040] When the present invention works, after the upper end of the main shaft 2 is threadedly connected to the lower end of the shaft of the top drive device which belongs to the mature prior art, according to the on-site construction conditions, the control calculation unit issues an instruction, which is transmitted to the permanent magnet synchronous motor 3 through the slip ring 1. After the permanent magnet synchronous motor 3 starts, it drives the driving gear 9 to rotate. The rotation of the driving gear 9 drives the piston 7 to move axially along the external spline 602. Due to the mating structure of the first inclined surface 702 and the second inclined surface of the piston 7 and the connecting rod 801, the jaw mechanism 8 moves radially outwards, thereby driving the slips 802 to move outwards, so that the slips 802 tighten the inner wall of the casing 12, achieving the initial pre-contact. Subsequently, the top drive device in the prior art is used to lift the casing running device of the present invention. The permanent magnet synchronous motor 3 continues to rotate. Due to the relative sliding of the inclined surfaces of the jaw mechanism 8 and the piston 7 in the vertical direction and the mutual extrusion effect, the slips 802 will further tighten the inside of the casing 12, thereby realizing the suspension of the casing 12. The top drive device can drive the casing running device of the present invention to rotate through the main shaft 2, and then drive the suspended casing 12 to rotate synchronously. Mud can be introduced into the main shaft 2 to realize the operation of circulating and injecting mud. In order to prevent the mud in the casing 12 from overflowing, a sealing structure 10 is provided at the lower part of the main shaft 2. When the mud pressure in the casing 12 is relatively high, the mud flows upwards and lifts the sealing structure 10, so that the side wall of the sealing structure 10 contacts and seals the inner side wall of the casing 12, realizing the sealing of the inside of the casing 12. The principle of the sealing structure 10 is similar to that of the check valve disc of a check valve, and will not be elaborated here. After the casing 12 running is completed, the permanent magnet synchronous motor 3 rotates in reverse, reducing the supporting force of the slips 802. The slips 802 contact and separate from the casing 12. Subsequently, the entire casing running device is lifted out of the casing 12, thus completing the operation of running in one casing 12. For different diameters of the casing 12, jaw mechanisms 8 of different sizes can be configured, which is fast and convenient and can adapt to more sizes of the casing 12.

[0041] The structure of the present invention is simple. It converts the rotational motion of the permanent magnet synchronous motor 3 into the linear reciprocating motion of the piston 7, and through the first inclined surface 702 and the second inclined surface, converts the linear reciprocating motion of the piston 7 into the radial motion of the connecting rod 801. It does not require a hydraulic source, avoiding the pollution of the environment caused by hydraulic oil leakage; without a supporting hydraulic station, the overall volume of the casing running device is small, which is convenient for transportation; this device is driven by a permanent magnet motor, featuring safety and reliability. At the same time, according to different specifications of the casing 12, by replacing the connecting rods 801 of different models, it can adapt to various sizes of the casing 12, featuring strong applicability; it avoids the disadvantages of the large number and heaviness of the equipment involved in the conventional casing 12 running operation, low automation degree, complex equipment conversion process and poor timeliness between different operation links.

[0042] In one embodiment, the upper flange end of the sliding sleeve 6 is fixedly connected to the lower flange of the connecting outer cover 4 by bolts. Four symmetric strip-shaped grooves 601 are formed around the sliding sleeve 6, and two connecting through holes are drilled on the side of each strip-shaped groove 601 to facilitate the installation of the connecting rod 801 of the jaw mechanism 8; the sliding sleeve 6 is manufactured by processing high-strength steel pipes, and the external spline 602 is processed by a gear shaper. There are strict positional tolerance requirements for the positions of the four symmetric strip-shaped grooves 601, the connecting through holes, and the external spline 602. The second inclined surface at the upper end of the jaw mechanism 8 is integrally wedge-shaped, and two long oval holes are provided on each side of the second inclined surface. The four connecting rods 801 are respectively installed in the four strip-shaped grooves 601 of the sliding sleeve 6, and the oval holes are connected to the corresponding connecting through holes on the sliding sleeve 6 by bolts; due to the structure of the oval holes, the connecting rod 801 can move radially in and out, driving the slip 802 to move radially in and out, so as to achieve the purpose of the slip 802 tightening the inner wall of the casing 12. The connecting rod 801 is manufactured by processing high-strength steel, and its wedge-shaped surface has been specially treated, wear-resistant, and the wedge-shaped surface angle is accurately calculated according to the diameter of different casings 12 to ensure the tightening force of the slip 802; the slip 802 is processed from 20CrMo material, the tooth surface is carburized and quenched, and the surface of the slip 802 is phosphated.

[0043] The specific working process of the present invention is as follows: When the top drive casing running device is connected to the top drive device and it is necessary to lift a casing 12, the guide joint 11 and the slip 802 are inserted into the inside of the casing 12. The control and calculation unit issues an instruction, which is transmitted to the permanent magnet synchronous motor 3 through the slip ring 1. After the permanent magnet synchronous motor 3 starts, it drives the driving gear 9 to rotate. The rotation of the driving gear 9 drives the piston 7 to move axially, causing the jaw mechanism 8 to move radially outwards, thereby driving the slip 802 to move outwards, so that the slip 802 tightly holds the inner wall of the casing 12, achieving initial pre-contact. The magnitude of the tightening force can be judged by the pressure sensor on the first inclined surface 702 of the piston 7. According to different working conditions (such as lifting the casing 12 or rotating the casing 12 for drilling, etc.), continue to rotate the permanent magnet synchronous motor 3 until the pressure value reaches the preset value, so as to lift the casing 12 or rotate the casing 12. When driving the casing 12 to drill in, the permanent magnet synchronous motor 3 remains in the rotated-in place state, so that the tightening force value reaches the preset requirement, and then the torque value meets the requirement. After the casing 12 is lowered in place, the permanent magnet synchronous motor 3 rotates in the reverse direction, so that the supporting force of the slip 802 on the casing 12 disappears. At this time, the device of the present invention can be lifted to disengage it from the casing 12. The present invention is an auxiliary device for casing running operations, which can achieve rapid installation of the device. By using the cooperation of the permanent magnet synchronous motor 3 and the jaw mechanism 8, rapid support for the casing 12 can be achieved, and then rapid extraction of the casing 12 can be realized. When it is necessary to make a connection by screwing the casing 12, the top drive device drives the casing running device of the present invention to drive the casing 12 to rotate, so that the casing 12 can be engaged with another structure or other casings 12. The top drive device or other existing hoisting devices can drive the casing running device of the present invention to move up and down and rotate, cooperating with the supporting and disengaging functions of the casing running device of the present invention for the casing 12, so as to drive the casing string of the casing 12 to be lowered and circulated for lowering, which can improve the casing running method, reduce the difficulty of casing running, and save the time for casing running.

[0044] Specific examples are applied in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A casing running device, characterized in that: Comprising: The device main body; An execution unit, connected below the device main body, the lower part of the execution unit can extend into the casing, is circumferentially distributed along the casing, and abuts against the inner side wall of the casing; A motor drive unit, arranged on the device main body, capable of controlling the lower part of the execution unit to reciprocate radially in the casing along the casing diameter.

2. The casing running device according to claim 1, characterized in that: The device main body includes a connection outer cover, a sliding sleeve is fixedly connected to the bottom of the connection outer cover, a plurality of strip-shaped grooves arranged along the circumference of the sliding sleeve are opened on the side wall of the sliding sleeve, and the upper part of the execution unit can move radially along the corresponding strip-shaped groove.

3. The casing running device according to claim 2, wherein: The execution unit includes a plurality of jaw mechanisms, each jaw mechanism includes a connecting rod and a jaw integrally formed, the upper part of the connecting rod is movably arranged in the corresponding strip-shaped groove, one end of the middle part of the connecting rod is connected to the upper part of the connecting rod, and the other end is connected to the lower part of the connecting rod; the middle part of the connecting rod is inclined inward, the outer side of the lower part of the connecting rod is fixedly connected with the jaw, and the lower part of the connecting rod can drive the jaw to extend into the casing and abut the jaw against the inner side wall of the casing; the motor drive unit can drive the upper part of the connecting rod to move radially along the corresponding strip-shaped groove.

4. The casing running device according to claim 3, characterized in that: The motor drive unit includes a permanent magnet synchronous motor arranged in the connection outer cover, and the permanent magnet synchronous motor is externally connected with a power supply; a driving gear is fixedly sleeved on the output shaft of the permanent magnet synchronous motor, a piston is sleeved outside the driving gear, an internal thread is arranged on the inner side wall of the piston, and the internal thread is in transmission connection with the driving gear. When the driving gear rotates, it can drive the piston to move axially along the connection outer cover; a plurality of first inclined surfaces arranged along the circumference of the piston are arranged on the outer side of the piston, the first inclined surfaces are gradually inclined outward from top to bottom, and a second inclined surface gradually inclined inward from bottom to top is arranged on the inner side of the upper part of the connecting rod, and the first inclined surface abuts against the second inclined surface of the corresponding connecting rod.

5. The casing running device according to claim 4, characterized in that: The execution unit further includes a main shaft with a hollow interior, the upper part of the main shaft penetrates through the top of the connection outer cover and is fixedly connected with the connection outer cover, the lower part of the main shaft passes through the hollow core shaft of the permanent magnet synchronous motor and is connected with a guide joint, and a mud through hole communicating with the inside of the main shaft is opened on the guide joint; the guide joint is located in the sleeve and can introduce the mud introduced into the main shaft into the sleeve through the mud through hole; a sealing structure is sleeved at the connection position of the main shaft and the guide joint, and the sealing structure can open under the action of the mud pressure in the sleeve and seal the sleeve.

6. The casing running device according to claim 3, characterized in that: A connection through hole is opened on the inner side wall of the strip-shaped groove, a waist-shaped hole arranged radially along the sliding sleeve is opened on the side wall of the upper part of the connecting rod, a bolt is fixedly penetrated in the connection through hole, and one end of the bolt is movably penetrated in the waist-shaped hole on the corresponding side.

7. The casing running device according to claim 4, characterized in that: A plurality of external splines are fixedly arranged on the inner side wall of the sliding sleeve, and the external splines are arranged at intervals with the strip-shaped grooves; a plurality of internal spline grooves are fixedly opened on the outer side wall of the piston, and the internal spline grooves are arranged at intervals with the first inclined surfaces, and the external splines slide in the corresponding internal spline grooves.

8. The casing running device according to claim 4, characterized in that: A pressure sensor is fixedly arranged on the first inclined surface, and the pressure sensor is externally connected with a control end.

9. The casing running device according to claim 4, wherein: A connecting welding plate is fixedly arranged on the inner side wall of the connecting outer cover, and the flange end of the permanent magnet synchronous motor is fixedly connected to the connecting welding plate.

10. The casing running device according to claim 3, wherein: The side of the slip that contacts the inner side wall of the casing is provided with slip teeth arranged in a staggered manner.

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