Static Pointing Rotary Steerable Drilling Tools

Abstract

The invention discloses a static pointing type rotary guiding drilling tool which comprises an outer cylinder. A drilling column, a hollow universal coupling and a mandrel are connected in sequence from top to bottom and arranged in the outer cylinder, the drilling column is rotatably connected into the outer cylinder, a polarization mechanism located in the outer cylinder is arranged at the upper end of the mandrel, a knuckle bearing assembly located in the outer cylinder is arranged at the lower end of the mandrel, a sealing assembly installed on the outer cylinder is arranged below the knuckle bearing assembly, and the lower end of the mandrel is fixedly connected with a drill. An eccentric planetary gear with small tooth difference is adopted for achieving polarization of the mandrel, and the static pointing type rotary guiding drilling tool is not influenced by geological stratification, can obtain stable build-up rate, and achieves accuracy control of well track. A plurality of working states can be achieved without drilling, and purposes of angle gain, angle drop and angle maintenance are achieved. Stress condition of the mandrel during polarization can be improved effectively, and service life of the rotary guiding tool is improved.

Description

technical field [0001] The patent of the present invention relates to drilling tools in the field of oil and natural gas drilling, in particular to a static pointing rotary steerable drilling tool. Background technique [0002] At present, drilling technology has been developed in the direction of ultra-deep wells, extended-reach wells and directional wells. Traditional sliding drilling tools can no longer meet the current drilling needs. Rotary steerable drilling technology has gradually been applied and developed as a high-tech drilling technology. [0003] Rotary steerable tools currently on the market mainly include Schlumberger's Power Drive, Baker Hughes' Auto Track and Halliburton's Geo-Pilot. The first two belong to the push-by rotary steerable drilling tools, and the characteristic of these two drilling tools is that they can obtain a large bias force at the drill bit. However, due to different geological conditions and changes in drilling fluid pressure, the build...

AI Technical Summary

Problems solved by technology

However, due to different geological conditions and changes in drilling fluid pressure, the build-up rate of tools will be affected, resulting in unsmooth wellbore trajectory, poor wellbore quality and wellbore conditions, and downhole accidents are prone to occur

[0004] Halliburton's Geo-Pilot system is a pointing rotary steerable drilling tool. It uses the control of the drill string bending characteristics to achieve effective guidance and control of the drill bit axis. The effect is obvious in soft and heterogeneous formations, but the core bearing is subjected to high-intensity alternating stress, and the mandrel is prone to fatigue damage, which affects the tool life

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