High build-up rate well track control method

Abstract

The invention relates to a high build-up rate well track control method, and belongs to the technical field of well track control methods. The high build-up rate well track control method includes an offset mechanism control method, an offset mechanism is designed by means of combined movement of eccentric rings, power derives from a drill rod, rotational movement of the drill rod is transferred to a speed reducer through an electromagnetic clutch by a coupler, the inner eccentric ring and the outer eccentric ring are respectively driven to rotate after speed is reduced by the speed reducer, so that a spindle is bent to different degrees, a dip angle inconsistent with a well axis is provided for a drill bit, the dip angle of the drill bit is controlled in a stepless manner, and a well track can be controlled. A bias drill bit is not used for guiding, the axis of the drill bit is effectively guided and controlled by controlling bending characteristics of a drill column, and a build-up rate is determined by a tool and cannot be affected by drilling formation lithology. The high build-up rate well track control method can be applied to track control for various wells such as a straight well, a directional well, an ultra-deep well, an extended reach well, an ultra-thin oil layer horizontal well, a long-distance horizontal well and a multi-branch well.

Description

technical field [0001] The invention relates to a method for controlling wellbore trajectory with high build-up rate, and belongs to the technical field of wellbore trajectory control methods. Background technique [0002] The high-deflection-rate wellbore trajectory control method is a high-tech invented to meet the needs of complex structure well drilling operations, and it is the research focus and development direction of high-deflection rate drilling in modern society. The high-deflection wellbore trajectory control method is used for steering drilling under the condition of full rotation of the drill string. It does not rely on offset drill bits for steering, but through a set of offset devices between the non-rotating jacket and the transmission spindle. Offset the drive spindle to provide the drill bit with an inclination angle that is inconsistent with the borehole axis, resulting in a steering effect. Using the method of controlling the wellbore trajectory with a ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a track control and various complex wells that can be applied to vertical wells, directional wells, ultra-deep wells, extended-reach wells, ultra-thin reservoir horizontal wells, long-distance horizontal wells, multi-branch wells, etc. For directional drilling in strata, when the drilling direction needs to be changed during the drilling process, a corresponding control command is issued to the bias device to make the transmission main shaft bend, the main shaft axis deviates from the original direction, and the direction control is completed, and the bit moves along the new drilling direction. It is a high-deflection-rate wellbore trajectory control method that can overcome the shortcomings of existing high-deflection-rate wellbore trajectory control methods, such as short tool life and high production costs.

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