Hydraulic internal cutter for cutting sleeve in deep sea

Abstract

The invention relates to a hydraulic internal cutter for cutting a sleeve in a deep sea and belongs to the technical field of petroleum and natural gas sleeve repairing tools. The cutter is composed of a shell, a cutter assembly, a piston assembly and the like and is characterized in that the piston assembly and a lower connector are installed at the two ends of the shell respectively, and the cutter assembly is installed in the middle of the shell; a centralizer is installed outside the shell; a flow channel is formed in the middle of the piston assembly and in the middle of the lower connector, hard alloy is embedded to a cutting edge of a cutter body, and the two sides of the tail end of the cutter body are provided with leaf springs through pin shafts; a center hole is formed in the center of a valve disk, and small holes are formed in the periphery of the small hole; a piston is in positioning connection with a cylinder sleeve through the valve disk, and a spring is installed between the piston and the shell. The cutter body is high in hardness and long in service life; the cutter body can retract freely, it is guaranteed that the cutter body performs operation in the center, the structure is simple, operation is convenient, and cutting efficiency is greatly improved; the problems that an existing cutter body cannot retract into the shell easily, the hardness of the cutter body is poor, service life is short, the structure and the operation are complicated, and cutting accidents can happen very easily are solved.

Description

technical field [0001] The invention relates to a hydraulic internal cutter used for cutting casings in deep sea, and belongs to the technical field of oil and natural gas casing repair tools. Background technique [0002] For some offshore oil and gas wells that are no longer worth exploiting, in order to reduce or eliminate their pollution to the marine environment, it is necessary to close these oil and gas wells that have no economic value, and then gradually complete the abandonment operation and complete the last process of the abandonment operation It's a recycling sleeve. In the prior art, cutting technologies for deep sea water are mainly thermal cutting and cold cutting. Thermal cutting and cold cutting also include many cutting methods. However, according to the relevant laws of the State Oceanic Administration and the cost and technical considerations , safety, reliability and other issues, there are not many cutting technologies to choose from. [0003] In ord...

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Problems solved by technology

[0004] The object of the present invention is to provide a knife body with increased hardness and long service life; the knife body can be retracted and released freely, ensuring that the knife body is always centered for operation; the structure is simple, the operation is convenient and safe, and the cutting efficiency is greatly improved; to solve the existing It is difficult for the cutter body to be retracted into the shell, and the hardness of the cutter body is poor, resulting in a short service life, and the structure and operation are complicated, and cutting accidents are prone to occur, which seriously affects the cutting efficiency. The hydraulic internal cutter used for deep-sea cutting casing

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