CN211950406U

CN211950406U - Oil gas well is with formula fishing tool that can unfreeze

Info

Publication number: CN211950406U
Application number: CN202020093923.7U
Authority: CN
Inventors: 马胜吉; 邱勇潮; 王娟; 张永灵; 杨文伟; 唐瑞欢; 张皓月
Original assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-11-17
Anticipated expiration: 2030-01-16

Abstract

The utility model discloses a releasable formula fishing tool for oil gas well, it mainly comprises attach fitting, overshot, pin and four-jaw tongs, attach fitting and overshot pass through screw thread coaxial coupling, four-jaw tongs cover outside overshot, fix through the pin; the outer surface of the fishing barrel is provided with a plurality of equalizing grooves, and chamfers from inside to outside are arranged at the bottoms of the equalizing grooves; the four-claw gripper is provided with a plurality of equally-divided split-type elastic claws, an equally-divided through groove is formed between every two elastic claws, chamfers are arranged in the elastic claws, and the split-type elastic claws are matched with the equally-divided grooves of the fishing barrel; the connecting joint and the overshot are provided with inner through holes. Adopt the utility model discloses, can effectively solve the technical problem such as the capture success rate that exists among the prior art is low, do not have automatic release and circulation channel.

Description

Oil gas well is with formula fishing tool that can unfreeze

Technical Field

The utility model relates to a formula fishing tool can unfreeze for oil gas well for salvaging of oil gas well downhole tool, fish, belong to the manufacturing technical field that oil and gas industry workover was equipped in the pit.

Background

In the process of oil and gas exploitation, in order to realize economic and sustainable exploitation, flow control is required to be performed on the oil and gas, and downhole throttling is generally adopted as a throttling mode for flow control. Because the existing choke can not adjust the flow in the well, after the choke is mined for a period of time, the choke needs to be cancelled or the choke nozzle needs to be replaced, and therefore a special fishing tool is needed to take the choke out of the well. The prior fishing tools on the market are numerous, for example, Chinese patent documents with the publication number of 202745785U and the publication number of 2013, 2 and 20 disclose a releasable fishing tool for oil and gas wells, which is designed for solving the problem of the downward sliding of the conventional gas-lift fishing tool and mainly comprises a connecting pipe connected with a dispenser, a connecting pipe and a connecting head connected with a cylindrical pin, a mandrel connected with the connecting head, an outer sleeve connected with the connecting pipe and the claw sleeve, a claw connected with the joint, a joint and a claw sleeve arranged in the outer sleeve, a locking sleeve arranged in the claw sleeve, a spring and a flat spring arranged on the locking sleeve, a fishing claw connected with the locking sleeve and the like. The utility model discloses a salvage process of slip formula underground throttle is accomplished in steel wire operation, after the throttle of unfreezing, drops into this new instrument of salvaging earlier, then salvages the new instrument of salvaging and throttle that has dropped into. In the fishing process, the new fishing tool can clamp the tubing coupling by the claw of the new fishing tool, so that the new fishing tool cannot fall into a well again.

However, the following technical drawbacks are still prevalent in the prior art represented by the above patent documents: 1. the capturing success rate is low; 2. the tool has no automatic releasing function, needs to be equipped with a special releasing tool, and is easy to generate secondary fish falling; 3. no flushing circulation channel exists, so that the fishing success rate is low.

Disclosure of Invention

The utility model discloses aim at defect and not enough to above-mentioned prior art existence, provide a oil gas well is with formula fishing tool that can unfreeze, adopt the utility model discloses, can effectively solve the technical problem such as the capture success rate that exists is low, do not have automatic releasing and circulation channel among the prior art.

The utility model discloses a realize through adopting following technical scheme:

the utility model provides an oil gas well is with formula fishing tool that can unfreeze which characterized in that: the fishing rod mainly comprises a connecting joint, a fishing barrel, a pin and a four-claw gripper, wherein the connecting joint is coaxially connected with the fishing barrel through threads, and the four-claw gripper is sleeved outside the fishing barrel and fixed through the pin; the outer surface of the fishing barrel is provided with a plurality of equalizing grooves, and the bottoms of the equalizing grooves are provided with a second chamfer from inside to outside; the four-claw gripper is provided with a plurality of equally-divided split-type elastic claws, an equally-divided through groove is formed between every two elastic claws, a first chamfer is formed in each elastic claw, and the split-type elastic claws are matched with the equally-divided grooves of the fishing barrel; the connecting joint and the overshot are provided with inner through holes.

Compared with the prior art, the utility model discloses the beneficial effect who reaches as follows:

1. the utility model adopts the fishing cylinder to continue moving downwards when contacting with the fallen fish, the fallen fish pushes open the split spring claws of the four-claw gripper under the reaction force, and the spring claws are drilled into the four-claw gripper, and the split spring claws are tightened under the self elasticity, so as to lift the tool pipe column and realize the fishing of the fallen fish; if the fish is buried by impurities in the well, circulation is established between the through hole in the fishing tool and the oil pipe for washing, so that the fishing neck of the fish is exposed for catching; if the fish is too locked, the fish is not lifted when reaching the lifting force limit, the pin is cut off, the connecting joint and the fishing barrel move upwards, the split elastic claws of the four-claw gripper move upwards along the chamfer at the bottom of the equalizing slot of the fishing barrel, and the split elastic claws of the four-claw gripper are opened, so that the releasing function is realized.

2. The utility model discloses simple structure, reliable operation can once the tool string go into the well and realize salvaging and well cleaning, does not need special release, and when the instrument broke the hand, can not stay new fish in the well, also can not injure the fish and salvage the neck and influence the secondary and salvage, and the biggest power of lifting can freely be adjusted in the certain limit.

Drawings

The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overshot configuration;

FIG. 3 is a schematic view A-A of FIG. 2;

FIG. 4 is a schematic view of B-B in FIG. 2;

FIG. 5 is a schematic view of a four-jaw gripper;

FIG. 6 is a schematic view of A-A in FIG. 5.

The labels in the figure are:

1. the fishing rod comprises a connecting joint, 2, a fishing barrel, 3, a pin, 4, a four-claw gripper, 5, an even distribution groove, 6, an even distribution through groove, 7, a first chamfer, 8 and a second chamfer.

Detailed Description

The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:

the utility model discloses mainly include attach fitting 1, an overshot 2, pin 3 and four-jaw tongs 4, attach fitting 1 passes through screw thread coaxial coupling with an overshot 2, four-jaw tongs 4 cover in 1 outsides of an overshot, and is fixed through pin 3. The outer surface of the overshot 2 is provided with a plurality of uniform grooves 5, and the bottoms of the uniform grooves 5 are provided with a second chamfer 8 from inside to outside. Four-jaw tongs 4 are provided with a plurality of and equally divide split type bullet claws, are provided with between every bullet claw and equally divide logical groove 6, play the claw internal surface and inwards be provided with chamfer 7 from the terminal surface, and split type bullet claw and the cooperation of dividing 5 grooves equally of overshot 2. The connecting joint 1 and the overshot 2 are both provided with inner through holes.

In this embodiment, the overshot 2 still continues to move downwards when contacting with the fish, and the fish pushes open the split elastic claw of the four-claw gripper under the reaction force, and drills into the four-claw gripper, and the split elastic claw is tightened up under the elasticity of the split elastic claw, so that the tool pipe column is lifted, and the fish is salvaged.

In the embodiment, if the fallen fish is buried by impurities in the well, the fallen fish can be flushed by establishing circulation between the through hole in the fishing tool and the oil pipe, so that the fishing neck of the fallen fish is exposed to be caught.

In this embodiment, if the fish is too locked, the fish still does not lift when reaching the lifting force limit, the pin 3 is cut off, the connecting joint 1 and the fishing barrel 3 move upwards, the split claws of the four-claw gripper move upwards along the two chamfer angles 8 at the bottom of the uniform split groove 5 of the fishing barrel, so that the split claws of the four-claw gripper 4 open, and the releasing function is realized.

Claims

1. The utility model provides an oil gas well is with formula fishing tool that can unfreeze which characterized in that: the fishing rod mainly comprises a connecting joint (1), a fishing barrel (2), a pin (3) and four-claw tongs (4), wherein the connecting joint (1) is coaxially connected with the fishing barrel (2) through threads, and the four-claw tongs (4) are sleeved outside the fishing barrel (2) and fixed through the pin (3); a plurality of uniform grooves (5) are formed in the outer surface of the overshot (2), and a second chamfer (8) from inside to outside is formed in the bottom of each uniform groove (5); the four-claw gripper (4) is provided with a plurality of equally-divided split-type elastic claws, an equally-divided through groove (6) is formed between every two adjacent elastic claws, a chamfer I (7) is arranged in each elastic claw, and the split-type elastic claws are matched with the equally-divided grooves (5) of the overshot (2); the connecting joint (1) and the overshot (2) are provided with inner through holes.