Variable-diameter hydraulic cutter capable of realizing continuous cutting of sleevings with different diameters through gear and rack transmission

Abstract

The invention relates to a variable-diameter hydraulic cutter capable of realizing continuous cutting of sleevings with different diameters through gear and rack transmission in the abandoned well operation process. The technical scheme of the cutter is that an upper joint is connected with a housing by threads; a spraying nozzle is located in a piston push rod and connected with the push rod by the threads; an upper spring, a turning mechanism and a piston are mounted on the piston push rod sequentially and arranged inside the housing; cutter knives are arranged uniformly in the circumferential direction and connected with the housing by hinge pins, gear structures of the upper parts of the cutter knife bodies are meshed with a cylindrical rack, the rack and the gears can transmit, and too large displacement of the cutter knives is limited while the opening degrees of the cutter knives are accurately controlled. According to the variable-diameter hydraulic cutter, the piston and the turning mechanism are pushed by the throttling action, gear and rack transmission is matched so as to realize continuous cutting of the sleevings with different diameters, trip times are reduced, the abandoned well operation time is saved, and the sleeving cutting efficiency and the operation reliability in the abandoned well operation process are improved greatly.

Description

technical field [0001] The invention relates to a variable-diameter hydraulic cutter capable of continuously cutting casings of different diameters through rack and pinion transmission, which can be used for cutting casings of different specifications in the process of oil and gas exploration and production and for later well abandonment operations. Background technique [0002] In the process of exploration and development of offshore and onshore oil and gas fields, some old oil and gas wells and safety hazard wells close to the design life will appear one after another. In order to prevent oil and gas leakage from threatening the natural environment and to make more reasonable and comprehensive use of oil and gas resources, after After the oil and gas resource assessment, these oil and gas wells with no economic value and safety hazard wells that need to be abandoned after reaching the service life will be closed, and then the permanent well abandonment operation will be gr...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low casing cutting efficiency in the process of well abandonment described in the background technology, the inability to accurately control the opening angle of the cutter body, the cutter is easy to wear, and the failure rate is high, and the continuous cutting operation of casings of different specifications is realized. , reduce the number of trips during the casing cutting process, improve the efficiency of well abandonment operations, and reduce costs and risks. The invention provides a variable-diameter hydraulic cutter that can continuously cut casings with different diameters through rack and pinion transmission.

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