Electro-hydraulic downhole casing hole opener

Abstract

The invention belongs to the technical field of well completion of petroleum and natural gas industries, and particularly relates to an electro-hydraulic downhole casing hole opener. The electro-hydraulic downhole casing hole opener is characterized by comprising a ground system, an electro-hydraulic power unit connected to the ground system through a cable and a hole opening unit connected to theelectro-hydraulic power unit; the electro-hydraulic power unit comprises a support frame, a fuel tank, a motor, a hydraulic pump, a relief valve connected to the hydraulic pump, an electromagnetic directional valve I and an electromagnetic directional valve II, wherein the electromagnetic directional valve I and the electromagnetic directional valve II are connected to the output end of the relief valve and arranged in parallel; and the hole opening unit comprises a unit body provided with four flow passages of the flow passage A, the flow passage B, the flow passage C and the flow passage D,a hydraulic motor, a piston bush connected with a motor output shaft through a spline, a drill bit in threaded connection with the piston bush and a pressing cap. The electro-hydraulic downhole casing hole opener transmits electric energy to the downhole from the ground through a cable, and the downhole hole opener is provided with the motor and a hydraulic power system, drives the drill bit to rotate and cut a casing, realizes hole opening of the casing, and provides conditions for implementing a next step of operation.

Description

technical field [0001] The invention belongs to the technical field of well completion in the petroleum and natural gas industry, and in particular relates to an electro-hydraulic downhole casing hole opener. Background technique [0002] In the process of oil and gas exploration and development, it is often necessary to drill the casing in the well for formation pressure measurement, cement extrusion and fracturing. At present, the commonly used casing drilling method is gunpowder perforation, but the perforating method generally has problems such as casing damage and irregular holes. In addition, due to the impact of policies related to safety management and environmental protection, the country has strict control over explosive products, and the approval and deployment process is lengthy, which restricts the casing opening method of conventional explosive perforation. Contents of the invention [0003] The purpose of the present invention is to provide a method that ca...

AI Technical Summary

Problems solved by technology

At present, the commonly used casing drilling method is gunpowder perforation, but the perforation method generally has problems such as casing damage and irregular holes.

In addition, due to the impact of policies related to safety management and environmental protection, the country has strict control over gunpowder products, the approval and deployment process is lengthy, and the casing opening method of conventional gunpowder perforation is restricted.

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