Non-metallic coiled tubing overshot

Abstract

A non-metal continuous oil tube catch sleeve belongs to a catch tool for oil drilling. The non-metal continuous oil tube catch sleeve consists of an upper joint (1), a spring (2), a barrel (3), a spring seat (4), a locating sleeve (5), a slip (6), a guiding shoe (7) and a mandrel (8). The inner wall at the lower end of the barrel (3) is a cone-shaped wall where the barrel diameter gradually reduces downwardly. The outer wall of the slip (6) is a cone-shaped wall, with clamping teeth (9) being arranged on the inner wall thereof and a cylindrical body of an expansion port (10) is arranged on thereon. The mandrel (8) is a rod body including a big diameter section, a small diameter section, an intermediate diameter section, a small diameter section and a cone-shaped head sequentially from top to bottom. The upper end and the lower end of the barrel (3) are respectively connected with the upper joint (1) and the guiding shoe (7) through threads. The spring (2), the spring seat (4), the locating sleeve (5), the slip (6) and the mandrel (8) are located inside the barrel (3). The mandrel (8) is inserted in the spring seat (4), the locating sleeve (5) and the slip (6); and the spring (2) is sleeved on the spring seat (4). The non-metal continuous oil tube catch sleeve can efficiently fish for non-metal continuous oil tubes such as plastic tubes, rubber tubes, and steel wire framed plastic composite tubes.

Description

technical field [0001] The invention relates to an oil drilling and fishing tool. Background technique [0002] In oil drilling operations, non-metallic coiled tubing such as plastic pipes, rubber pipes, and steel wire skeleton plastic composite pipes often fall into casings, which cannot be salvaged with existing fishing tools. Searching through Chinese patent documents and checking relevant materials have not yet seen the report that can salvage the above-mentioned non-metallic coiled tubing fishing tools. Contents of the invention [0003] The purpose of the present invention is: to provide a kind of overshot that can efficiently salvage the non-metallic coiled tubing such as plastic pipe, rubber pipe and steel wire skeleton plastic composite pipe etc. that falls in the casing. [0004] The technical solution of the present invention is: it is composed of an upper joint, a spring, a cylinder body, a spring seat, a positioning sleeve, a slip, a guide shoe and a core rod...

AI Technical Summary

Problems solved by technology

[0002] In oil drilling operations, non-metallic coiled tubing such as plastic pipes, rubber pipes and steel wire skeleton plastic composite pipes often fall into casings, which cannot be salvaged with existing fishing tools

Searching through Chinese patent documents and reviewing relevant materials has not yet seen any report on fishing tools that can salvage the above-mentioned non-metallic coiled tubing

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