Frequency-adjustable jet impact type oscillator

Abstract

The invention provides a frequency-adjustable jet flow impact type oscillator. The frequency-adjustable jet flow impact type oscillator comprises a shell; the piston assembly is arranged in the shell and comprises a cylinder body and a piston arranged in the cylinder body, a connecting rod is arranged at one end of the piston, and the free end of the connecting rod extends out of the cylinder body; the jet flow control element is arranged at the upper end of the piston assembly; the power hammer is fixedly connected with the free end of the connecting rod; the short section is arranged at the lower end of the power hammer, and the lower end of the short section forms a lower connector used for being connected with a lower drill column; the elastic component is sleeved on the short section, and the elastic component and the short section form a suspension support for the lower drill column; wherein the jet flow control element can control the piston to reciprocate along the cylinder body and drive the power hammer to synchronously move to impact the short section, and the elastic assembly converts impact energy into elastic deformation under the action of impact force, so that the lower drill column generates axial vibration along with the elastic deformation; the frequency of the axial vibration and the vibration displacement of the lower drill column can be adjusted according to actual working requirements.

Description

technical field [0001] The invention belongs to the technical field of oil drilling, in particular to a frequency-adjustable jet impact oscillator. Background technique [0002] With the increase of the number of extended-reach wells and the continuous extension of horizontal displacement, there are problems such as increased friction and drag pressure during drilling, and the WOB cannot be effectively transmitted, which reduces the ROP of the drilling tool and reduces the horizontal displacement. The ability to extend, even the designed well depth cannot be drilled. The hydraulic oscillator can improve the effectiveness of the WOB transmission during the drilling process and reduce the frictional resistance between the bottom hole and the wellbore through the longitudinal vibration generated by itself, and improve the WOB transmission in the directional drilling using power drilling tools. , which can reduce the possibility of sticking of the drilling tool assembly and red...

AI Technical Summary

Problems solved by technology

[0003] However, there are still some problems in the existing hydraulic oscillators, such as large pressure drop, limited ability to reduce supporting pressure, and interference of oscillation frequency to the signal transmission of the measurement-while-drilling system, etc.

In addition, most of the existing hydraulic oscillators have relatively simple functions, and most of them can only increase the ROP and reduce the frictional resistance between the downhole drilling tool and the well wall, but cannot adjust the frequency at the same time, so that the lower drill string cannot be adjusted according to the design. Frequency oscillation, its stability is poor, and it cannot guarantee its stable performance while improving the ROP

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