Rotary guiding drilling tool

Abstract

The invention relates to a downhole guiding drilling tool, and belongs to the technical field of petroleum engineering stratigraphical drilling downhole tools. The downhole guiding drilling tool consists of an irrotational coat, a rotary mandrel and a directed control mechanism, wherein a fixed centralizer and a guiding roller are arranged on the outer surface of the irrotational coat; the directed control mechanism is arranged in an inner cavity; and the guiding roller can be controlled to extend and retract by rotation and vertical movement of the drilling tool. When the guiding roller extends, a lateral thrust is applied to a drill bit, and a well track can forwards move along a certain direction. When extending, the roller is supported on a well wall, and the irrotational coat is prevented from rotating, but can downwards move when the drilling tool is fed, so that the purpose of directed drilling of the drilling tool under the state of rotation is realized. When retracting, the guiding roller does not have a guiding function, and the drilling tool drills like the conventional drilling tool.

Description

Technical field:

[0001] The invention relates to a downhole directional drilling tool, which belongs to the technical field of downhole tools for formation drilling in petroleum engineering. Background technique

[0002] In the drilling of oil and gas wells, due to the limitation of the objective conditions on the ground or the influence of many factors such as the distribution of oil layers, it is necessary to control the trajectory of the drilling wellbore so that it can advance in a certain direction, successfully drill into the oil and gas layers, and achieve the purpose of oil and gas production , Such as conventional directional wells, horizontal wells, lateral wells, multi-bottom wells, three-dimensional circumvention wells, etc. all need to use directional drilling technology.

[0003] The development of sliding directional drilling technology has become mature in the late 1980s. At present, this technology is widely used in directional drilling construction. Slidin...

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