Pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time

Abstract

The invention relates to a pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, and belongs to the technical field of subsea wellhead abandoned well tools. According to the technical scheme of the pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, an upper connector is connected with a cutter body through threads; an upper center body is connected with a limiting block through threads, and the limiting block is placed in the cutter body by being in clearance fit with the cutter body; a piston is in the shape of a cross, and in contact with the upper center body through a specially-made connector, the connector is connected on the piston through threads, and a sealing rubber body is fixed on the piston through a spring baffle ring; the spring is placed in a cavity body between the piston and the cutter body; blades are connected with the cutter body through pin shafts; and a lower center body is fixedly connected on a threaded sleeve through threads, then placed in the cutter body through the threaded sleeve, and fixed through a limiting bolt. According to the pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, high-efficiency cutting conducted on 9-5 / 8'' to 13-3 / 8'' casings can be completed, the abandoned well operation time is saved, and thus the purpose of saving cost is achieved.

Description

technical field [0001] The invention relates to a pressure-relieving hydraulic cutter capable of cutting multiple layers of casings with different diameters at one time, 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 gradual development of offshore oil exploitation to the deep sea, the original well abandonment cutting technology can no longer adapt to the current deep sea operation conditions. With abandonment operations costing millions of dollars, the operational expense of salvage recovery is a major cost to the industry. [0003] Casing cutting is an important process in well abandonment operations. For permanent well abandonment operations, the most critical link is casing cutting. Casing cutting operations first cut and recover 9-5 / 8″ and 13-3 / 8″ casing, which are small-diameter thin-walled pipes, single-layer c...

AI Technical Summary

Problems solved by technology

[0004] The existing mechanical cutting technology cannot meet the complex underwater conditions in the deep sea, lacks accurate judgment on the completion of cutting, easily leads to cutting accidents, and the cutting efficiency is relatively low

Images