Drilling and workover rig lifting device driven by electric cylinder

Abstract

The utility model discloses a drilling and workover rig lifting device driven by an electric cylinder. The drilling and workover rig lifting device comprises a derrick. A guide pulley block is installed on the top of the derrick, a plurality of pulleys with coincident axes are arranged on the guide pulley block at intervals, a rail is arranged on the left side of the derrick, a top drive is installed on the rail in a sliding mode, two sets of electric telescopic cylinders are arranged on the right side of the derrick, and the lower portions of the electric telescopic cylinders are fixed to the derrick through fixing bases. A connecting lug is installed on the top of the telescopic end of the electric telescopic cylinder, the connecting lug is connected with a conversion connecting base, one end of a connecting rope is connected with the conversion connecting base, the other end of the connecting rope is reversed through a pulley of a guide pulley block and then connected with a balance connecting block, and the balance connecting block is connected with a top drive. Reciprocating lifting and lowering movement of the top drive is achieved through telescopic movement of the electric cylinder, and the problems that in the prior art, transmission efficiency is low, the structure is complex, and oil pollution is serious are solved.

Description

Technical Field

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

[0002] The lifting device is an essential component of a workover rig, responsible for the frequent reciprocating operations of raising and lowering drill tools and running casing. Currently, the lifting devices used on workover rigs primarily consist of two types: a winch wound with wire rope and a hydraulic cylinder driven extension and retraction of the derrick's upper section.

[0003] There are two main types of existing lifting devices: 1. A winch-wound wire rope lifting device primarily consists of a derrick, winch, crown block, traveling block, and wire rope. The crown block pulley and the traveling block pulley form a movable pulley block, with the wire rope passing through the movable pulley block to form a force-amplifying mechanism. 2. A hydraulic cylinder-driven lifting device primarily consists of a derrick, a cylinder, a crown block, and a connecting rope. The derrick has a telescopic upper and lower structures, with a guide pulley mounted on the crown block. One end of the connecting rope connects to the lower derrick and the other end connects to the top drive via a guide pulley on the crown block. The cylinder raises and lowers the upper derrick to form a speed-increasing mechanism. The main problems with existing technologies include: 1. Low transmission efficiency, requiring regular replacement of lubricating oil or hydraulic oil, and high operating costs; 2. Complex structure, requiring extensive disassembly and installation work, large transport dimensions, and frequent transport trips; 3. Leakage of grease, lubricating oil, or hydraulic oil can cause significant pollution, making it difficult to meet current environmental protection requirements. Utility Model Content

[0004] In view of the shortcomings of the existing drilling and workover rig lifting devices, the utility model aims to provide a drilling and workover rig 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, and serious oil pollution in the existing technology.

[0005] The technical solution adopted by the utility model to solve this technical problem is: a drilling and workover rig lifting device driven by an electric cylinder, comprising a derrick; a guide pulley group is installed on the top of the derrick, a plurality of pulleys with coincident axes are arranged at intervals on the guide pulley group, a track is provided on the left side of the derrick, a top drive is slidably installed on the track, two groups of electric telescopic cylinders are provided on the right side of the derrick, the lower parts of the electric telescopic cylinders are fixed to the derrick through fixed seats, a connecting ear is installed on the top of the telescopic end of the electric telescopic cylinder, the connecting ear is connected to the conversion connecting seat, one end of the connecting rope is connected to the conversion connecting seat, the other end of the connecting rope is connected to the balancing connecting block after the pulley of the guide pulley group is reversed, and the balancing connecting block is connected to the top drive.

[0006] As a further solution of the present invention, there are multiple connecting ropes, which are respectively wound around different pulleys.

[0007] As a further solution of the present invention, two groups of electric telescopic cylinders are fixed symmetrically to the vertical center axis of the derrick.

[0008] As a further solution of the present invention, two sets of tracks are provided on the left side of the derrick, and the top drive is slidably installed on the double tracks.

[0009] As a further solution of the present invention, a cross conversion joint is installed on the top of the top drive, and the lower end of the balance connection block is connected to the cross conversion joint through a balance pin.

[0010] As a further solution of the present invention, the number of the connecting ropes is 2 to 3, which are arranged at equal intervals between the conversion connecting seat and the balancing connecting block.

[0011] As a further solution of the present invention, wire rope connectors having a number equal to the number of the connecting ropes are installed on the balancing connection block at equal intervals.

[0012] The present invention includes at least the following beneficial effects: the lifting device driven by the electric telescopic cylinder is particularly suitable for single-root drilling rigs and single-root well repairing rigs, and has the advantages of simple structure, high transmission efficiency, high reliability, small disassembly and installation workload, less oil pollution and low operation and maintenance costs. The derrick bears the downward balancing force of the top drive and the electric telescopic 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 requirements inside the derrick and making the derrick compact. The upper and lower limit positions of the top drive are determined by the stroke of the electric telescopic cylinder, which avoids the top drive from hitting and falling from the mechanical structure, thereby improving the safety of the operation. The use of two sets of electric telescopic cylinders and multiple connecting rope structures can avoid the top drive falling accidents caused by mechanical failure and improve the safety of the lifting device.

[0013] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of the lifting device of the drilling and workover machine when the top drive is lowered to a low position;

[0015] Figure 2 It is a side view of the lifting device of the drilling and workover machine when the top drive is lowered to a low position.

[0016] Among them, 1-derrick, 2-connecting rope, 3-guide pulley group, 4-electric telescopic cylinder, 5-top drive, 6-track, 7-fixed seat, 8-conversion connecting seat, 9-balancing connecting block, 10-balancing pin, 11-cross conversion head. DETAILED DESCRIPTION

[0017] The following is a detailed and complete description of the present invention in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on this description. Before describing the present invention in conjunction with the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including the following description, may be combined with each other unless they conflict.

[0018] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort should fall within the scope of protection of the present invention.

[0019] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and embodiments, and the specific implementation process is as follows:

[0020] like Figures 1 and 2 As shown, the present invention provides an electric cylinder-driven hoisting device for a drilling and workover rig, comprising a derrick 1; a guide pulley block 3 is mounted on the top of the derrick 1, with multiple pulleys having overlapping axes spaced apart on the guide pulley block 3; a track 6 is provided on the left side of the derrick 1, with a top drive 5 slidably mounted on the track 6; and two sets of electric telescopic cylinders 4 are provided on the right side of the derrick 1. The lower portions of the electric telescopic cylinders 4 are fixed to the derrick 1 via a fixing seat 7. Connecting ears are mounted on the tops of the telescopic ends of the electric telescopic cylinders 4, which are connected to a conversion connection seat 8. One end of a connecting rope 2 is connected to the conversion connection seat 8, and the other end of the connecting rope 2 is connected to a balancing connection block 9 after being deflected by the pulleys of the guide pulley block 3. The balancing connection block 9 is connected to the top drive 5. The top drive 5 and the electric telescopic cylinders 4 both apply a downward load to the derrick 1, reducing the additional bending moment caused by the eccentric load on the derrick 1 and reducing the offset of the wellhead center when the top drive 5 is subjected to load. The top drive 5 is driven to move up and down by the electric telescopic cylinder 4, and the lower part of the top drive 5 is connected to the pipe string.

[0021] This technical solution may further include the following technical details to better achieve the technical effect: there are multiple connecting ropes 2 and they are respectively wound around different pulleys.

[0022] This technical solution may further include the following technical details to better achieve the technical effect: two groups of electric telescopic cylinders 4 are fixed symmetrically to the vertical central axis of the derrick 1.

[0023] This technical solution may also include the following technical details to better achieve the technical effect: two sets of tracks 6 are provided on the left side of the derrick 1, and the top drive 5 is slidably installed on the double tracks 6. The top drive 5 track 6 adopts the double track 6 for more stable travel.

[0024] This technical solution may also include the following technical details to better achieve the technical effect: a cross conversion joint is installed on the top of the top drive 5, and the lower end of the balancing connection block 9 is connected to the cross conversion head 11 through a balancing pin 10. The balancing connection block 9 can rotate around the balancing pin 10 to eliminate the uneven force caused by the length errors of multiple connecting ropes 2.

[0025] This technical solution may further include the following technical details to better achieve the technical effect: the number of the connecting ropes 2 is 2 to 3, which are arranged at equal intervals between the conversion connecting seat 8 and the balancing connecting block 9.

[0026] This technical solution may also include the following technical details to better achieve the technical effect: wire rope connectors equal in number to the connecting ropes are installed on the balancing connection block at equal intervals.

[0027] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. 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 embodiments shown and described herein.

Claims

1. A lifting device for a drilling and repair machine driven by an electric cylinder, characterized in that: It includes a derrick; a guide pulley group is installed on the top of the derrick, and a plurality of pulleys with overlapping axes are arranged at intervals on the guide pulley group; a track is provided on the left side of the derrick, and a top drive is slidably installed on the track; two groups of electric telescopic cylinders are provided on the right side of the derrick, and the lower part of the electric telescopic cylinder is fixed to the derrick through a fixed seat, and a connecting ear is installed on the top of the telescopic end of the electric telescopic cylinder, and the connecting ear is connected to the conversion connecting seat, one end of the connecting rope is connected to the conversion connecting seat, and the other end of the connecting rope is connected to the balance connecting block after the pulley of the guide pulley group is reversed, and the balance connecting block is connected to the top drive.

2. The electric cylinder driven drilling and repair machine lifting device according to claim 1, characterized in that: There are multiple connecting ropes, which are respectively wound around different pulleys.

3. The electric cylinder driven drilling and repair machine lifting device according to claim 2, characterized in that: The two sets of electric telescopic cylinders are fixed symmetrically to the vertical center axis of the derrick.

4. The electric cylinder driven drilling and repair machine lifting device according to claim 3, characterized in that: Two sets of tracks are provided on the left side of the derrick, and the top drive is slidably installed on the double tracks.

5. The electric cylinder driven drilling and repair machine lifting device according to claim 4, characterized in that: A cross conversion joint is installed on the top of the top drive, and the lower end of the balance connection block is connected to the cross conversion joint through a balance pin.

6. The electric cylinder driven drilling and repair machine lifting device according to claim 5, characterized in that: The number of the connecting ropes is 2 to 3, which are arranged at equal intervals between the conversion connecting seat and the balancing connecting block.

7. The electric cylinder driven drilling and repair machine lifting device according to claim 1, characterized in that: Wire rope connectors equal in number to the connecting ropes are installed at even intervals on the balancing connection block.

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