Dynamic pressure lubrication drilling tool and drilling tool assembly with same

Abstract

The invention relates to a dynamic pressure lubrication drilling tool and a drilling tool assembly. The dynamic pressure lubrication drilling tool comprises a central shaft, wherein a shell can be sleeved on the outer part of the central shaft in a rotating manner relative to the central shaft, and an annular space is formed between the inner wall of the shell and the peripheral surface of the central shaft; more than one rotor is arranged on the inner wall of the shell, each rotor is provided with a plurality of inwards protruding rotor blades, and the rotor blades are positioned in the annular space; and the side wall of the central shaft is provided with more than one shunting hole. The drilling tool assembly is provided with a drill column, wherein the drill column comprises a plurality of sequentially connected conventional drilling tools and at least one dynamic pressure lubrication drilling tool; and the dynamic pressure lubrication drilling tool is arranged between two adjacent conventional drilling tools. when a well is drilled, the drilling tool assembly brings drilling fluid to the space between the drilling tool and a well wall or a sleeve wall under the fluid pumping action when the dynamic pressure lubrication drilling tool rotates, and the outer surface of the drilling tool is separated from the well wall or the sleeve wall, so that dry friction or boundary friction between the outer surface of the drilling tool and the well wall or the sleeve wall is changed into fluid friction.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a drilling tool that can use the pump fluid action when the drilling tool itself rotates to bring the drilling fluid into the friction surface between the outer surface of the drilling tool and the well wall or casing wall, so as to bring the outer surface of the drilling tool to the friction surface of the casing wall. The well wall or casing wall is separated, and the dry friction or boundary friction between the outer surface of the drilling tool and the well wall or casing wall is changed to liquid friction. A drill tool assembly to prevent well deviation. Background technique [0002] In the process of drilling, the problem of deviation prevention of vertical wells has always been one of the difficult problems in the field of oil and gas drilling, especially when drilling in inclined formations in high and steep structural areas, the problem of well deviation is very serious. For example,...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing anti-deflection and straightening technologies are represented by the above-mentioned known technologies. They can only prevent or correct deviation through direct contact between the drilling tool and the well wall or casing wall when the well deviation has occurred. Realize that the outer surface of the drilling tool is automatically separated from the well wall or casing wall during drilling, so that the drilling tool automatically tends to the center of the borehole to prevent the occurrence of well deviation. Therefore, in the known technology, rapid drilling and anti-deflection drilling Straight contradictions still exist

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