Two-dimensional hydraulic vibrator for oil drilling

Abstract

The invention relates to a two-dimensional hydraulic vibrator used for petroleum drilling, which belongs to the technical field of petroleum drilling tool design. The vibrator is composed of a flow rate control valve, a filtering joint, a screw motor motive power joint, a hydraulic impulse generator, and the like, wherein the flow rate control valve is used for adjusting the flow rate and the speed of mud flowing into the vibrator; the filtering joint is used for filtering rough mud components; the mud entering into the vibrator forms a certain differential pressure in the screw motor motive power joint to push a rotor structure inside a screw motor to rotate, and meanwhile, the rotor vibrates eccentrically in a rubber stator; the hydraulic impulse generator produces vibration in the circumferential direction through the circular change of the open area between a stationary ring and a rotating ring of a PDC thrust bearing. According to the invention, the two-dimensional vibration produced in the circumferential direction by the vibrator can effectively overcome the frictional resistance between a large displacement well and a horizontal well drill stem with a well wall, lowers the twisting moment between the drill stem and the well wall, avoids the happening of the jamming of a drilling tool, and has the characteristics of greatly improving the drilling efficiency and lowering the drilling cost.

Description

Technical field: [0001] The invention relates to a two-dimensional hydraulic vibrator for oil drilling, which belongs to the technical field of oil drilling tool design. Background technique: [0002] In the process of petroleum drilling, especially in the drilling process of extended-reach wells and horizontal wells, the frictional resistance of the pipe string is the core problem to be solved, which directly determines and affects the maximum extension of extended-reach wells and horizontal wells. [0003] Usually, the ratio of displacement to vertical depth of extended-reach wells and horizontal wells is greater than or equal to 2, the lower limit of the inclination angle must exceed 63°, and since generally extended-reach wells have a vertical section, the maximum The well inclination angle is generally above 70°; the inclination depth of extended-reach wells is up to several thousand meters. For horizontal wells, the wellbore trajectory is approximately horizontal, and ...

AI Technical Summary

Problems solved by technology

Under such circumstances, most of the self-weight of the extended-reach well and horizontal well drill string will be pressed against the well wall, and a large friction force will be generated between the drill string and the well wall, which will make it difficult to slide the drill string and make the drill string bear Larger torque makes the drilling speed slow and may cause stuck pipe accidents

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