A variable-diameter eye reamer and method for reaming the same

Abstract

The invention discloses a variable-diameter reamer and a reaming method thereof. The reamer comprises an upper connector, a body and a position limiting base, wherein the upper connector is connected to the upper end of the body through threads; a lower connector is connected to the lower end of the body through threads; the position limiting base is connected into the body and at the lower end of the upper connector through threads; the position limiting base is connected to the upper end of a mandrel through a pin; a piston is arranged at the lower end of the mandrel; a spring sleeve, a spring mounted inside the spring sleeve, a spring protecting sleeve, an upper baffle ring in contact with the spring, a reamer wing and a lower baffle ring are sequentially arranged on the outer wall of the mandrel and between the position limiting base and the piston; an independent reversing sleeve is arranged between the lower baffle ring and the piston; a reversing pin is arranged inside the reversing sleeve; the reversing pin is matched with a reversing track on the outer wall of the mandrel. The reamer can effectively solve the problems that the reamer wing cannot be folded for some reasons, and the reamer wing has an inconsistent reaming size under the influence of pump pressure, and can be opened and closed repeatedly to improve the reaming efficiency.

Description

technical field [0001] The invention relates to a variable-diameter reamer and a reaming method thereof, belonging to the technical field of drilling and reaming. Background technique [0002] In recent years, with the continuous development and improvement of oil drilling and production technology, in the process of onshore and offshore oil and gas drilling and production, the wellbore formed by drilling is often encountered due to the compression of the formation, which makes the drilling process difficult due to the shrinkage of the wellbore diameter. Continuing the problem, reaming has become an important means to solve complex deep well jamming, improve casing procedures, improve cementing quality and reduce drilling costs. Most hydraulic reamers retract the blades by relying on the thrust provided by the spring in the state of no pump pressure. Occasionally, the blades cannot be retracted in place. If this happens, the drilling cannot be tripped, resulting in an accide...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a variable-diameter eye reamer and its eye reaming method to solve the problem that the blades cannot be retracted for some reason and the blades are affected by the pump pressure, resulting in different reaming sizes. Fluid pressure for multiple openings and closings

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