Hydraulic hole opener and hole opening method

Abstract

The invention discloses a hydraulic hole opener and a hole opening method. The hydraulic hole opener comprises an upper connector 1, the upper connector is connected with the upper end of a body 7 through threads, the lower end of the body is connected with a lower connector 22, an upper ball seat 4 is arranged in the upper connector and is connected with the upper connector through a dowel pin 3, three cutter wing grooves distributed in 120 degrees are formed in the body, a cutter wing 11 is arranged in each cutter wing groove, a mandrel 9 is arranged in the body, a piston 15 sleeves the bottom of the mandrel, a retainer ring 12 is arranged at the top of the piston, and hole opening operation is finished by pushing the cutter wings to expand outwards through the retainer ring. The hole opener is simple in structure, convenient to disassemble and capable of folding the unfolded cutter wings forcedly. Reliability of the cutter wings can be improved by changing a mud channel, cutter wing blocking possibility is reduced, cutter wing deformation is small, and the service life of the cutter wings and the body are prolonged. The safety of the hole opener is greatly improved, and the drill blocking problem caused by the fact that the cutter wings cannot be folded due to fault is solved.

Description

technical field [0001] The invention relates to a hydraulic reamer and a reaming method thereof, belonging to the technical field of oil and gas drilling tools. 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 absence of pump pressure. Occasionally, the blades cannot be retracted in place. If this happens, the drilling will not be able to trip and cause an accide...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a hydraulic eye reamer and its eye reaming method to solve the problem that the blade cannot be folded and the blade is in the groove of the blade The problem of premature damage to the knife wing groove due to the vibration of the vibration, and improve the service life of the eye reamer

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