Downhole radial casing window opener

Abstract

The invention discloses a downhole radial casing window opener. The window opener comprises a body, a power portion arranged in the body, a radial drilling portion and a fluid flow passage portion, and the upper portion of the power portion is connected with an output shaft of a screw motor, transmits torque and is capable of converting horizontal rotary power outputted by the output shaft into vertical rotary power. The radial drilling portion comprises a drill bit and a resilience device, the drill bit rotates vertically under the action of the power portion, high-pressure fluid is fed in the fluid flow passage portion and is acted on the drill bit, and when pressure of the high-pressure fluid is larger than resiliency provided by the resilience device, the drill bit extends out of the body radially. A wind opening direction is a horizontal direction through gears, a pushing ram and the like, steering curvature radius is decreased, complete radial perforation of a casing is achieved, section milling of the casing is not required, window opening position is accurate, and operation is efficient and reliable.

Description

technical field [0001] The invention relates to the field of oil and gas well drilling, in particular to a downhole casing radial window opening device. Background technique [0002] The radial window water jet drilling technology is a new oil and gas well drilling and stimulation technology that integrates perforation, window opening and orientation. Its core principle is to open radial windows on the casing of the oil layer first. This technology can be implemented in both new wells and old wells, and is very suitable for the development of coalbed methane, low-permeability oil layers, thin oil layers, fractured oil layers and lithologic trap oil layers. At present, the casing window opening methods commonly used in China are sidetracking window opening and section milling window opening. The turning radius of the two is much larger than the diameter of the downhole tool, and the horizontal turning in the wellbore cannot be performed, which affects the radial drilling. Th...

AI Technical Summary

Problems solved by technology

At present, the casing window opening methods commonly used in China are sidetracking window opening and section milling window opening. The turning radius of the two is much larger than the diameter of the downhole tool, and the horizontal turning in the wellbore cannot be performed, which affects the radial drilling. The operating efficiency and accuracy of the technology, wasting manpower and material resources

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