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Static pointing type rotary guiding drilling tool

A rotary steerable drilling and pointing technology, which is applied in the field of drilling tools, can solve problems affecting tool life, mandrel fatigue damage, etc., and achieve the effects of increasing working life, improving stress conditions, and realizing precise control

Active Publication Date: 2013-01-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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Embodiment Construction

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:

[0021] See Figure 1 ~ Figure 5 , A static directional rotary steering drilling tool includes an outer cylinder 20 in which a drill string 1, a hollow universal joint 2 and a mandrel 3 are connected sequentially from top to bottom, and the drill string 1 rotates Connected in the outer cylinder 20, the upper end of the mandrel 3 is provided with a biasing mechanism located in the outer cylinder 20, and the lower end of the mandrel 3 is provided with a joint bearing located in the outer cylinder 20 Assembly 14, under the joint bearing assembly 14, a sealing assembly 19 mounted on the outer cylinder 20 is provided, and a drill 4 is fixedly connected to the lower end of the mandrel 3;

[0022] The bias mechanism includes a servo motor I21, the output shaft of the servo m...

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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, natural gas and other drilling fields, in particular to a static pointing type rotary steering drilling tool. Background technique [0002] At present, drilling technology has 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. As a high-tech drilling technology, rotary steering drilling technology has gradually been applied and developed. [0003] At present, the rotating steering tools on the market mainly include Schlumberger's Power Drive, Baker Hughes' Auto Track, and Halliburton's Geo-Pilot. The first two belong to push-on rotary steering drilling tools. The characteristics of these two drilling tools are that they can obtain a large offset force at the bit. However, due to different geological conditions and changes in drilling fluid pressure will af...

Claims

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Application Information

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IPC IPC(8): E21B7/04
Inventor 牛文铁李洪涛王丽娜李远志
Owner TIANJIN UNIV
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