A variable-diameter hydraulic cutter for cutting casings with different diameters using multi-head screw drive

Abstract

The invention relates to a variable-diameter hydraulic cutter for cutting sleeve pipes different in diameter through multi-start screw transmission, and the variable-diameter hydraulic cutter is used for operation of abandoned wells. The variable-diameter hydraulic cutter is characterized in that an upper connector is in threaded connection with a housing, and a nozzle is located in a mandrel and connected with the mandrel through a thread; a piston is installed at the upper end of the mandrel in a threaded connection mode, and the piston, the mandrel and a spring are put in the housing; the mandrel is provided with a spiral groove, and the mandrel and the housing are matched to form a multi-start screw pair; a worm is located on the lower portion of the mandrel and is matched with the mandrel through a spline; cutter bodies are uniformly arranged in the circumferential direction and connected with the housing through hinge pins, a worm wheel on the upper portion of the cutter bodies are meshed with the worm, and rotation of the worm and the worm wheel is achieved. Through the mandrel, linear motion is transformed into rotary motion and transferred to the worm, the worm wheel is driven to rotate, the opening angles of the cutter bodies are thus controlled, continuous cutting of the sleeve pipes different in diameter can be achieved, the number of times of tripping operation is reduced, and the sleeve pipe cutting efficiency and operation reliability in the operation of abandoned wells are largely improved.

Description

technical field [0001] The invention relates to a variable-diameter hydraulic cutter capable of cutting casings with different diameters by means of multi-head screw 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] With the continuous development of the offshore and onshore petroleum industry, more and more aging oil and gas wells and safety hazard wells close to the design life have lost the value of continuous production. Utilizing oil and gas resources, after exploration and evaluation of oil and gas resources, 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 abandoned, and then the permanent well abandonment operation will be gradually completed, and the key to the well abandonment operation The technique involves casing cutti...

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, easy wear of the cutter, and high failure rate, the continuous cutting operation of casings of different specifications is realized , reduce the number of trips to cut the casing, improve the efficiency of well abandonment operations, and reduce costs and risks. The invention provides a variable-diameter hydraulic cutter that uses multi-head screw drive to cut casings with different diameters.

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