CN212479144U

CN212479144U - Novel slips overshot

Info

Publication number: CN212479144U
Application number: CN202021100179.5U
Authority: CN
Inventors: 刘海风
Original assignee: Tonghua Petroleum Tools Co Ltd
Current assignee: Tonghua Petroleum Tools Co Ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-02-05
Anticipated expiration: 2030-06-15

Abstract

The utility model relates to an oil field workover tool field, novel slips salvage section of thick bamboo promptly. The slip comprises a cylinder, wherein the upper end of the cylinder is connected with an upper joint, the inner opening part at the lower end of the cylinder is provided with a cylinder inner conical surface acting with a slip, a spring and the slip are arranged between the cylinder inner conical surface and the lower end of the upper joint, the slip is a split type two-piece circular slip, the outer surface of the lower end of the slip is provided with an outer conical surface acting with the cylinder inner conical surface, and the inner surface of the slip is provided with a thread; the lower end of the cylinder body is connected with a guide shoe, and the guide shoe is characterized in that a key body supporting sleeve is arranged between the slips and the guide shoe in a propping mode, one end face of the key body supporting sleeve is connected with a slips key body in a lining mode along the axial direction, and a key groove for inserting the slips key body is formed in the inner surface of the corresponding cylinder body. Firstly, a welding structure is removed, a key groove is machined in the cylinder body, and then a fixed key body is used for supporting a sleeve structure, so that the effective work of the slip key is kept, and the strength is ensured. Secondly, the structure of the slip teeth is damaged due to the fact that the slip teeth are too sharp, and the slip teeth sharp point is made into a 0.2mm wide face structure.

Description

Novel slips overshot

Technical Field

The utility model relates to an oil field workover tool field, novel slips salvage section of thick bamboo promptly.

Background

In the prior art, the overshot is used as a special fishing tool for fishing drill collars, drill pipes, oil pipes and other columnar fish from the outside in the oil field drilling and workover engineering. The inner conical surface of the cylinder body and the slips form conical surface contact matching, and fishing is achieved. The novel slip overshot (as shown in figure 1) comprises a cylinder body 2, wherein the upper end of the cylinder body 2 is connected with an upper connector 1 (the upper connector 1 is connected with a drill string), the inner opening part of the lower end of the cylinder body 2 is provided with a cylinder inner conical surface 7 acting with a slip, a spring 3, a spring seat 4 and a slip 5 are arranged between the cylinder inner conical surface 7 and the lower end of the upper connector 1, the slip 5 is a split type two-piece circular slip, the outer surface of the lower end of the slip 5 is provided with an outer conical surface 8 acting with the cylinder inner conical surface 7, and the inner surface of the slip 5 is provided with a thread 9; the lower end of the cylinder body 2 is connected with a guide shoe 10. The slips 5 are connected to the barrel 2 by two slip keys 6 so that the slips 5 can move axially along the barrel 2 but cannot rotate circumferentially. The working principle is as follows: when a new slip overshot is used for fishing or back-off operation, after a fish is introduced into the overshot, axial pressure is continuously applied, the fish pushes the slip to separate the slip from the conical surface of the cylinder body, the slip goes upward in the cylinder body and compresses the spring, and the fish expands the slip and continues to go upward until the slip pushes the upper joint end surface; and lifting the drill string, propping the slips by a compression spring, enabling the slips to clasp the fish and moving downwards in the cylinder, continuing to move downwards after the conical surface is attached, biting the fish by sharp slip teeth, and lifting the drill string to realize fishing. If the fish is required to be reversely buckled, the torque is transmitted to the slips through the key structure (the key body supporting sleeve) on the cylinder body, and the slip is lifted and rotated left at the same time, so that the fish is buckled. The disadvantages are that: 1. the slip key and the cylinder are connected by adopting a welding method, and the cylinder and the slip key are annealed in the welding process, so that the strength is reduced. 2. The slip elements are too sharp. 3. The fishing length of the slip teeth is too short.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the aforesaid not enough and a novel slips overshot has guaranteed barrel intensity, has increased and has salvaged the success rate.

The technical solution of the utility model is that: the novel slip overshot comprises a cylinder body, wherein an upper connector is connected to the upper end of the cylinder body, an inner opening part at the lower end of the cylinder body is provided with a cylinder body inner conical surface acting with a slip, a spring and a slip are arranged between the cylinder body inner conical surface and the lower end of the upper connector, the slip is a split type two-piece circular slip, the outer surface of the lower end of the slip is provided with an outer conical surface acting with the cylinder body inner conical surface, and the inner surface of the slip is provided with thread teeth; the lower end of the cylinder body is connected with a guide shoe, and the guide shoe is characterized in that a key body supporting sleeve is arranged between the slips and the guide shoe in a propping mode, one end face of the key body supporting sleeve is axially and symmetrically connected with slip key bodies, and key grooves for the slip key bodies to insert are formed in the inner surface of the corresponding cylinder body.

The slip tooth point is made into a surface structure with the width of 0.2 mm.

The utility model has the advantages that: 1. firstly, a welding structure is removed, a key groove is machined in the cylinder body, and then a fixed key body is used for supporting a sleeve structure, so that the effective work of the slip key is kept, and the strength is ensured. 2. Secondly, the structure of the slip teeth is damaged due to the fact that the slip teeth are too sharp, and the slip teeth sharp point is made into a 0.2mm wide face structure.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic view of the prior art overshot.

Fig. 2 is a schematic view of the structure of the present invention.

Fig. 3 is a schematic view of fig. 2 rotated 90 degrees along section a-a.

Fig. 4 is a schematic view of a key body support sleeve structure.

Fig. 5 is a schematic top view of fig. 4.

Detailed Description

Referring to fig. 1-5, the part names are as follows: the slip-type pipe fitting comprises an upper connector 1, a barrel 2, a spring 3, a spring seat 4, a slip 5, a slip key 6, a barrel inner conical surface 7, an outer conical surface 8, a thread tooth 9, a guide shoe 10, a key body supporting sleeve 11, a slip key body 12 and a key groove 13.

Referring to fig. 2 and 3, the novel slip overshot comprises a cylinder body 2, wherein the upper end of the cylinder body 2 is connected with an upper connector 1, the inner opening part of the lower end of the cylinder body 2 is provided with a cylinder inner conical surface 7 acting with a slip, a spring 3 and a slip 5 are arranged between the cylinder inner conical surface 7 and the lower end of the upper connector 1, the slip 5 is a split type two-piece circular slip, the outer surface of the lower end of the slip 5 is provided with an outer conical surface 8 acting with the cylinder inner conical surface 7, and the inner surface of the slip 5 is provided with a thread tooth 9; the lower end of the cylinder body 2 is connected with a guide shoe 10. A key body supporting sleeve 11 is arranged between the slips 5 and the guide shoe 10.

Referring to fig. 4 and 5, one end surface of the key body support sleeve 11 is axially and symmetrically connected with a slip key body 12, and a key groove 13 for inserting the slip key body 12 is formed on the inner surface of the corresponding cylinder 2. The slip key welding structure is removed, a key groove is machined in the cylinder body instead, and the key body supporting sleeve is fixed by using a structure, so that the phenomenon of annealing the cylinder body 1 and the slip key is avoided, the effective work of the slip key is kept, and the strength is ensured. The strength of the cylinder body is ensured, and the fishing success rate is increased. The utility model discloses theory of operation, application method are the same with traditional, and the structure is more excellent.

The above description is only exemplary of the present invention, and the various illustrations do not limit the essence of the present invention.

Claims

1. The novel slip overshot comprises a cylinder body (2), wherein an upper connector (1) is connected to the upper end of the cylinder body (2), an inner opening part of the lower end of the cylinder body (2) is provided with a cylinder inner conical surface (7) acting with a slip, a spring (3) and a slip (5) are arranged between the cylinder inner conical surface (7) and the lower end of the upper connector (1), the slip (5) is a split type circular slip formed by two segments, the outer surface of the lower end of the slip (5) is provided with an outer conical surface (8) acting with the cylinder inner conical surface (7), and the inner surface of the slip (5) is provided with a thread (9; the lower end of the cylinder body (2) is connected with a guide shoe (10), and the lower end of the cylinder body (2) is connected with the guide shoe (10), and is characterized in that a key body supporting sleeve (11) is arranged between the slips (5) and the guide shoe (10) in a propping mode, one end face of the key body supporting sleeve (11) is symmetrically connected with slip key bodies (12) along the axial direction, and key grooves (13) for the slip key bodies (12) to be inserted are formed in the inner surface of the corresponding cylinder.

2. The slip overshot of claim 1, further characterized by slip cusps configured as 0.2mm wide faces.