A special overshot for coiled tubing fish
An overshot and fish-dropping technology, applied in wellbore/well components, earth-moving drilling, etc., can solve the problems of poor salvage effect and specific limitations of coiled tubing structure, and achieve the effect of novel design and simple structure
Active Publication Date: 2016-11-16
YANGTZE UNIVERSITY
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Problems solved by technology
Most of the existing string fishing methods (including tools and techniques) are limited in construction due to the particularity of the coiled tubing structure, resulting in poor fishing results
Method used
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[0022] The coiled tubing overfish special overshot comprises a mandrel 1, an upper joint 2, an outer sleeve joint 3, an outer sleeve 4, slips and a slip taper sleeve 22. One end of the mandrel 1 provided with a central through hole 5 is threaded with an upper joint 2, the other end of the mandrel 1 is provided with a limit boss 6, and the mandrel 1 is fitted with an outer sleeve joint 3 and an outer sleeve 4, The outer sleeve 4 is threadedly connected with the outer sleeve joint 3; the end of the outer sleeve joint 3 is in contact with the limiting boss 6 of the mandrel 1 .
[0023] The end of the outer sleeve 4 is threaded with guide shoes 7; one end of the mandrel 1 in the outer sleeve 4 is equipped with slips through a compression spring 8 and a thrust bearing 9. The slips are cylindrical and consist of a slip seat 10, a slip body 11 and a slip head 12. One end of the slip seat 10 is fixed with a slip body 11, and the end of the slip body 11 is provided with a slip head. 1...
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The invention relates to a special catching sleeve for coiled tubing fish, belonging to the technique field of well drilling fishing tool. The special catching sleeve comprises a core shaft, an upper joint, an outer sleeve joint, an outer sleeve, a kava and a kava taper sleeve. The upper joint is mounted at one end of the core shaft, the core shaft is sleeved with the outer sleeve joint and the outer sleeve, the guiding shoe is mounted at the end of the outer sleeve through screw thread; the kava is mounted at one end of the core shaft in the outer sleeve, the kava taper sleeve is arranged at one side of the kava, one end of the kava taper sleeve is sleeved on the kava. The special catching sleeve is novel in design and simple in structure; the kava is matched with the kava taper sleeve in the work process for realizing coiled tubing fish; the special catching sleeve for coiled tubing fish solves the bad effect caused by the limit of the existing convention inside caliper fishing tool, and the limit of the particularity of the coiled tubing fish structure under construction. The special catching sleeve for coiled tubing fish is suitable for the oil gas well coiled tubing fish.
Description
technical field [0001] The invention relates to an overshot special for coiled tubing falling fish, and belongs to the technical field of drilling and fishing tools. Background technique [0002] With the deepening of oil and natural gas extraction technology, the promotion and application of coiled tubing technology in the process of oil and gas extraction is becoming more and more extensive, and the accidents of coiled tubing falling into wells caused by various situations are also increasing year by year. There are many fishing tools at home and abroad. There are multi-functional slip overshots aimed at fishing heavy fish in deep and ultra-deep wells, and there are overshots that generate radial force to spread the cover around and smoothly enter the inner hole of the fish cavity to catch fish. Spiral guided retractable fishing spear. Because the wall thickness of the coiled tubing is relatively thin, although the male and female cones can be used to make buckles and sal...
Claims
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IPC IPC(8): E21B31/18
CPCE21B31/18
Inventor 周传喜苗芷芃管锋徐健付寅
Owner YANGTZE UNIVERSITY