A drilling and repair machine lifting device driven by an electric cylinder

Abstract

The present invention discloses a drilling and repair machine lifting device driven by an electric cylinder, comprising: a derrick, a lifting rope, a crown block pulley block, an electric cylinder and a top drive; the derrick is installed outside the wellhead center; the crown block pulley block is installed on the top of the derrick, an electric cylinder is arranged on the rear side of the derrick, an outer tube of the electric cylinder is fixed to the derrick, a top drive guide rail is arranged on the front side of the derrick along the height direction, the top drive is installed on the top drive guide rail on the front side of the derrick, the lifting rope passes around the front and rear sides of the derrick through the crown block pulley block, the end of the lifting rope located on the front side drives the top drive to move up and down, and the end of the lifting rope located on the rear side is pulled up and down by the electric cylinder. The present invention utilizes the telescopic movement of the electric cylinder to realize the reciprocating lifting and lowering movement of the top drive, and solves the problems of low transmission efficiency, complex structure, and serious oil pollution in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling and workover equipment in oil and gas production, and more specifically, to a drilling and workover machine lifting device driven by an electric cylinder. Background Art

[0002] The lifting device is an essential and important working part of the drilling and repair machine. Its function is to frequently reciprocate the drilling tools and casing operations. At present, the lifting device of the drilling and repair machine mainly includes two types: the winch winding wire rope and the hydraulic cylinder driving the extension and retraction of the derrick upper body.

[0003] There are two main types of existing lifting devices: 1. The lifting device with a winch-wound wire rope structure is mainly composed of a derrick, a winch, a crown block, a traveling block, a wire rope, etc. The crown block pulley and the traveling block pulley form a movable pulley group, and the wire rope passes through the movable pulley group to form a force-increasing structure; 2. The lifting device driven by a hydraulic cylinder is mainly composed of a derrick, a cylinder, a crown block, a lifting rope, etc. The derrick is an upper and lower telescopic structure, and a guide pulley is installed on the crown block. One end of the lifting rope is connected to the lower body of the derrick, and the other end is connected to the top drive through the guide wheel on the crown block. The cylinder lifts and lowers the upper body of the derrick to form a speed-increasing structure. The main problems of the existing technology: 1. The transmission efficiency is low, the lubricating oil or hydraulic oil needs to be replaced regularly, and the operating cost is high; 2. The structure is complex, the workload of disassembly and installation is large, the transportation size is large, and the number of transportation vehicles is large; 3. The leakage and pollution of grease, lubricating oil or hydraulic oil is serious, and it is difficult to meet the current environmental protection requirements. Summary of the invention

[0004] In view of the shortcomings of the existing drilling and repair machine lifting device, the present invention aims to provide a drilling and repair machine lifting device driven by an electric cylinder, which utilizes the telescopic movement of the electric cylinder to realize the reciprocating lifting and lowering movement of the top drive, thereby solving the problems of low transmission efficiency, complex structure, serious oil pollution, etc. in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a drilling and repair machine lifting device driven by an electric cylinder, comprising: a derrick, a lifting rope, a crown block pulley block, an electric cylinder and a top drive; The derrick is installed on the outside of the wellhead center; the crown block pulley block is installed on the top of the derrick, an electric cylinder is arranged on the rear side of the derrick, an outer tube of the electric cylinder is fixed to the derrick, a top drive guide rail is arranged on the front side of the derrick along the height direction, the top drive is installed on the top drive guide rail on the front side of the derrick, the lifting rope passes through the crown block pulley block to bypass the front and rear sides of the derrick, the end of the lifting rope on the front side drives the top drive to move up and down, and the end of the lifting rope on the rear side is pulled up and down by the electric cylinder.

[0006] As a further solution of the present invention, there are multiple lifting ropes and they are arranged at equal intervals.

[0007] As a further solution of the present invention, the electric cylinder comprises a servo motor, a reducer, a gear box, and a cylinder barrel; the servo motor is connected to the reducer, the reducer is connected to the gear box, and the gear box drives the cylinder barrel to perform axial telescopic movement; The cylinder comprises, from outside to inside, a telescopic outer tube 1, an outer tube 2, an outer tube 3 and an outer tube 4, and an upper support ear is installed on the outer tube 4.

[0008] As a further solution of the present invention, the lower part of the electric cylinder is fixed to the lower part of the derrick by a pin shaft, the upper support ear of the electric cylinder is connected to the conversion connection seat, and the rear end of the lifting rope is connected to the electric cylinder through the conversion connection seat.

[0009] As a further solution of the present invention, the top of the top drive is connected to the lower part of the cross conversion head through a lifting ring pin, the front end of the lifting rope is connected to the balancing connection block, the lower end of the balancing connection block is connected to the cross conversion head by a balancing pin, and the balancing connection block can rotate around the balancing pin; the setting direction of the balancing pin is perpendicular to the setting direction of the lifting ring pin.

[0010] As a further solution of the present invention, a plurality of top drive guide rails are installed in parallel on the front side of the derrick.

[0011] As a further solution of the present invention, a brake device is arranged at the lower part of the servo motor.

[0012] The present invention has at least the following beneficial effects: 1. The electric cylinder is driven by a permanent magnet synchronous servo motor with high transmission efficiency, avoiding the need to regularly replace lubricating oil or hydraulic oil, and low operating costs.

[0013] 2. The derrick bears the downward balancing force of the top drive and the electric cylinder, reducing the additional bending moment of the derrick and the weight of the derrick material; the wellhead center is arranged outside the derrick, reducing the space requirement inside the derrick and making the derrick compact; the winch, big rope, traveling block of the traditional drilling and workover rig lifting device or the hydraulic station and cylinder of the hydraulic workover rig are eliminated, and the electric cylinder and overhead crane are transported with the derrick, which reduces the workload of disassembly and installation and requires fewer transport modules.

[0014] 3. Reduce the use of lubricating oil, avoid the use of hydraulic oil, and reduce the risk of oil pollution on site.

[0015] 4. When the top drive is loaded, the wellhead center offset is small, which improves the construction quality of drilling and workover operations and reduces the wear caused by pipe eccentricity.

[0016] 5. The upper and lower limit positions of the top drive are determined by the stroke of the electric cylinder, which avoids the top drive from hitting and falling from the mechanical structure and improves the safety of operation.

[0017] 6. The electric cylinder is always under tension, which avoids the adverse effect of buckling caused by compression and improves the working reliability of the electric cylinder.

[0018] 7. The wellhead center is arranged outside the derrick, which is convenient for the layout of wellhead automation tools and avoids personnel operating in the restricted space inside the derrick.

[0019] 8. Two sets of electric cylinders and multiple lifting ropes are used to avoid top drive falling accidents caused by mechanical failure and improve the safety of the lifting device.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the hoisting device of the drilling and repair machine when the top drive of the present invention is lowered to a low position; Figure 2 It is a side view of the lifting device of the drilling and workover machine when the top drive of the present invention is lowered to a low position; Figure 3 It is a structural schematic diagram of the lifting device of the drilling and repair machine when the top drive is lifted to a high position; Figure 4 It is a side view of the lifting device of the drilling and repair machine when the top drive of the present invention is lifted to a high position; Figure 5 It is a structural schematic diagram of the electric cylinder of the present invention.

[0022] Among them, 1-derrick, 2-lifting rope, 3-crane pulley block, 4-electric cylinder, 5-top drive, 6-top drive guide rail, 7-pin shaft, 8-conversion connecting seat, 9-lifting ring pin, 10-balance pin, 11-cross conversion head, 12-balance connecting block, 41-servo motor, 42-reducer, 43-gear box, 44-brake device, 45-upper support ear, 46-outer tube one, 47-outer tube two, 48-outer tube three, 49-outer tube four. DETAILED DESCRIPTION

[0023] The present invention is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other without conflict.

[0024] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows: like Figures 1 to 5 As shown, the present invention provides a drilling and repair machine lifting device driven by an electric cylinder 4, comprising: a derrick 1, a lifting rope 2, a crown block pulley block 3, an electric cylinder 4 and a top drive 5; The derrick 1 is installed outside the center of the wellhead to facilitate the arrangement of automated tools at the wellhead; the overhead crane pulley block 3 is installed on the top of the derrick 1, and the electric cylinder 4 is arranged on the rear side of the derrick 1. The outer tube 46 of the electric cylinder 4 is fixed to the derrick 1 through a fixed seat, and a top drive guide rail 6 is arranged on the front side of the derrick 1 in the height direction. The top drive 5 is installed on the top drive guide rail 6 on the front side of the derrick 1. The lifting rope 2 passes around the front and rear sides of the derrick 1 through the overhead crane pulley block 3, and the end of the lifting rope 2 on the front side drives the top drive 5 to move up and down, and the end of the lifting rope 2 on the rear side is pulled up and down by the electric cylinder 4.

[0026] The top drive 5 and the electric cylinder 4 are arranged on the front and rear sides of the derrick 1. Since the lower part of the top drive 5 is connected to the pipe string, the top drive 5 and the electric cylinder 4 both apply a downward load to the derrick 1, thereby reducing the additional bending moment caused by the eccentric load of the derrick 1 and reducing the offset of the wellhead center when the top drive 5 is subjected to the load.

[0027] Working principle: The electric cylinder 4 is driven by a permanent magnet synchronous servo motor 41, which converts the motor's rotational motion into the linear motion of the upper lug 45 of the electric cylinder 4. The linear motion of the electric cylinder 4 is transmitted to the top drive 5 through the lifting rope 2 and the crown block pulley block 3. The top drive 5 carries the drilling tools at the center of the wellhead for lifting and lowering and casing operations. When the electric cylinder 4 is fully retracted, the top drive 5 is lifted to the highest position of the derrick 1. When the electric cylinder 4 is fully extended, the top drive 5 is lowered to the lowest position of the derrick 1. The stroke of the electric cylinder 4 enables the top drive 5 to touch the crown block and hit the drill table. The synchronous motion of the upper lugs 45 of the two electric cylinders 4 is achieved by precisely controlling the speed, torque error and other parameters of the servo motors 41 of the two electric cylinders 4. At the same time, the rigid connection of the upper lugs 45 of the two electric cylinders 4 realizes the mechanical synchronization of the electric cylinders 4.

[0028] The technical solution may further include the following technical details to better achieve the technical effect: the number of the lifting ropes 2 is multiple and they are arranged at equal intervals.

[0029] The technical solution may also include the following technical details to better achieve the technical effect: the electric cylinder 4 includes: a servo motor 41, a reducer 42, a gear box 43, and a cylinder barrel; the servo motor 41 is connected to the reducer 42, the reducer 42 is connected to the gear box 43, and the gear box 43 drives the cylinder barrel to perform axial telescopic movement; The cylinder barrel includes a retractable outer tube 1 46, an outer tube 2 47, an outer tube 3 48, and an outer tube 49 from the outside to the inside. An upper support ear 45 is installed on the outer tube 49. When there are multiple electric cylinders 4, the upper support ears 45 of the electric cylinders 4 are rigidly connected through a conversion connecting seat 8, so that multiple electric cylinders 4 can achieve mechanical synchronization.

[0030] The present technical solution may also include the following technical details to better achieve the technical effect: the lower part of the electric cylinder 4 is fixed to the lower part of the derrick 1 by a pin shaft 7, the upper support ear 45 of the electric cylinder 4 is connected to the conversion connection seat 8, the rear end of the lifting rope 2 is connected to the electric cylinder 4 through the conversion connection seat 8, and the electric cylinder 4 is transported with the derrick 1.

[0031] The present technical scheme may also include the following technical details to better achieve the technical effect: the top of the top drive 5 is connected to the lower part of the cross conversion head 11 through the lifting ring pin 9, the front end of the lifting rope 2 is connected to the balancing connection block 12, and the lower end of the balancing connection block 12 is connected to the cross conversion head 11 by a balancing pin 10. The balancing connection block 12 can rotate around the balancing pin 10 to eliminate the influence of uneven force caused by the length errors of multiple lifting ropes 2; the setting direction of the balancing pin 10 is perpendicular to the setting direction of the lifting ring pin 9, which increases the rotational freedom and prevents the structure from being subjected to additional bending moment.

[0032] The technical solution may also include the following technical details to better achieve the technical effect: a plurality of top drive guide rails 6 are installed in parallel on the front side of the derrick 1 .

[0033] The technical solution may also include the following technical details to better achieve the technical effect: a brake device 44 is provided at the lower part of the servo motor 41, and the brake is applied when the motor loses power, and is opened when the motor is powered, so as to prevent the electric cylinder 4 from being out of control due to a sudden power outage.

[0034] The lifting device driven by the electric cylinder 4 is particularly suitable for single-rod drilling rigs and single-rod workover rigs, and has the advantages of simple structure, high transmission efficiency, high reliability, small installation and disassembly workload, less oil pollution and low operation and maintenance costs. The electric cylinder 4 has a fast response capability. Compared with traditional mechanical transmission and hydraulic transmission, the electric cylinder 4 has faster start and stop capabilities, can be accurately positioned at any position, and has controllable speed. It is particularly suitable for the working conditions of the drilling and workover rig lifting device frequently changing speed and direction, and it is easier to realize the automation and informatization of the current drilling and workover rig.

[0035] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A lifting device for a drilling and repairing machine driven by an electric cylinder, characterized in that: include: Derrick, hoisting rope, overhead crane pulley block, electric cylinder and top drive; The derrick is installed on the outside of the wellhead center; the crown block pulley block is installed on the top of the derrick, an electric cylinder is arranged on the rear side of the derrick, an outer tube of the electric cylinder is fixed to the derrick, a top drive guide rail is arranged on the front side of the derrick along the height direction, the top drive is installed on the top drive guide rail on the front side of the derrick, the lifting rope passes through the crown block pulley block to bypass the front and rear sides of the derrick, the end of the lifting rope on the front side drives the top drive to move up and down, and the end of the lifting rope on the rear side is pulled up and down by the electric cylinder.

2. The electric cylinder driven drilling and repair machine lifting device according to claim 1, characterized in that: The number of the lifting ropes is multiple and they are arranged at equal intervals.

3. The electric cylinder driven drilling and repair machine lifting device according to claim 1, characterized in that: The electric cylinder comprises: a servo motor, a reducer, a gear box, and a cylinder barrel; the servo motor is connected to the reducer, the reducer is connected to the gear box, and the gear box drives the cylinder barrel to perform axial telescopic movement; The cylinder comprises, from outside to inside, a telescopic outer tube 1, an outer tube 2, an outer tube 3 and an outer tube 4, and an upper support ear is installed on the outer tube 4.

4. The electric cylinder driven drilling and repair machine lifting device according to claim 3, characterized in that: The lower part of the electric cylinder is fixed to the lower part of the derrick by a pin shaft, the upper support ear of the electric cylinder is connected to the conversion connection seat, and the rear end of the lifting rope is connected to the electric cylinder through the conversion connection seat.

5. The electric cylinder driven drilling and repair machine lifting device according to claim 3, characterized in that: The top of the top drive is connected to the lower part of the cross conversion head through a lifting ring pin, and the front end of the lifting rope is connected to the balancing connection block. The lower end of the balancing connection block is connected to the cross conversion head by a balancing pin, and the balancing connection block can rotate around the balancing pin; the setting direction of the balancing pin is perpendicular to the setting direction of the lifting ring pin.

6. The electric cylinder driven drilling and repair machine lifting device according to claim 3, characterized in that: A plurality of top drive guide rails are installed in parallel on the front side of the derrick.

7. The electric cylinder driven drilling and repair machine lifting device according to claim 3, characterized in that: A brake device is arranged at the lower part of the servo motor.

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