Deviation mechanism for rotating guide drilling tool

Abstract

The invention provides a deviation mechanism for a rotating guide drilling tool. The deviation mechanism comprises a drill bit, stabilizers, a first drill rod, a force exerting unit, a crossed joint, a second drill rod, a third drill rod, a still unit, an inner transmission shaft, a centering bearing and a rotating joint, wherein the first drill rod, the second drill rod and the third drill rod are connected into a whole through the crossed joint, the inner transmission shaft is positioned inside the drill rod, the lower end of the inner transmission shaft is connected with the drill bit through the rotating joint, the first stabilizer is arranged in a position near the drill bit, the still unit is arranged in a cavity formed by the drill rods and the inner transmission shaft, the lower end of the still unit is arranged in a position near the first stabilizer and is fixed with the drill bit through the centering bearing, the force exerting unit is fixedly arranged on the still unit, and the second stabilizer is arranged in a position far away from the still unit. Through adopting the technical scheme, the deviation mechanism can be applicable to drilling-fluid-free drilling machines, in addition, the drilling rods can generate controllable deviation under the rotating conditions, and the drill bit is driven to generate corresponding deviation, so that the well hole track control is realized.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a biasing mechanism of a rotary steerable drilling tool. Background technique [0002] Rotary steerable drilling technology is a cutting-edge automatic drilling technology developed in the 1990s in the world. It is the main content of closed-loop automatic drilling, the highest stage of drilling technology development in the world today. Its appearance is a qualitative leap in the world's drilling technology. Compared with the traditional slide-steering drilling technology, the rotary-steering drilling technology is more suitable for complex drilling because the downhole tools are always working in a rotating state, so the wellbore cleaning effect is better, the wellbore trajectory control accuracy is higher, and the displacement extension capability is stronger. Special technology wells such as ultra-deep wells, high-difficulty directional wells, cluster wells, horizonta...

AI Technical Summary

Problems solved by technology

But this kind of drilling rig is still far from perfect. In order to make this kind of drilling rig reach the purpose of commercial operation, according to the development direction of the current existing technology and the characteristics of this drilling rig, the research on the rotary steering paranoid mechanism suitable for this drilling rig is carried out.

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