Wing rib driving mechanism of rotary steering drilling tool

A technology of rotary steerable drilling and driving mechanism, which is applied to driving devices for drilling in wellbore, directional drilling, drilling equipment, etc., and can solve problems such as difficulty in overcoming the reaction force of wing ribs.

Active Publication Date: 2013-06-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the actual working conditions of rotary steerable drilling tools in oil drilling, it is difficult for such a degree of pushing force to overcome the reaction force of the well wall on the ribs, so that the ribs can extend radially smoothly.

Method used

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  • Wing rib driving mechanism of rotary steering drilling tool
  • Wing rib driving mechanism of rotary steering drilling tool
  • Wing rib driving mechanism of rotary steering drilling tool

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Experimental program
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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The rib mechanism of the present invention is one of the keys to realize the rotary steerable drilling tool, and it achieves the purpose of controlling the trajectory of the drill string by controlling the protrusions of the controllable ribs arranged on the non-rotating casing in different radial directions . Such as figure 1 As shown, the rotary steerable drilling tool of the present invention includes three rib drive mechanisms with the same structure, which are symmetrically arranged on the non-rotating casing of the drill string at the bottom of the rotary steerable drilling tool, and every two rib drive mechanisms are separated by an angle of 120°. Each rib driving mechanism includes a hydraulic cylinder 1 (not shown), a rib 2 and a trolley roller 3, wherein the piston 11 of the hydraulic cylinder 1 is connected to the shaft of the trol...

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Abstract

The invention provides a wing rib driving mechanism of a rotary steering drilling tool, which is characterized of comprising the following steps of: 1) installing the rotary steering drilling tool which comprises three wing rib driving mechanisms, wherein the wing rib driving mechanisms comprises liquid cylinders, wing ribs and trolley idler wheels; the pistons of the liquid cylinders are connected with the shafts of the trolley idler wheels; the fixed ends of the wing ribs are fixed on the pistons by means of hinging and supporting, and the other ends of the wing ribs are free ends; and the free ends are tangent with the trolley idler wheels by inclined planes; 2) obtaining the well wall sticking force S of the wing ribs and the journey X of the trolley idler wheels according to the driving force P of the liquid cylinders, the inclined angle a of the inclined planes and the friction coefficient f of the trolley idler wheels; 3) optimizing the wing ribs well wall sticking force S of the wing ribs and the journey X of the trolley idler wheels to obtain the best inclined angle a and complete design. The method and the mechanism can be used for designing and analyzing the wing rib driving mechanisms of the various rotary steering drilling tools.

Description

technical field [0001] The invention relates to a mechanism and a design method of an oil drilling tool, in particular to a wing rib driving mechanism of a rotary steerable drilling tool. Background technique [0002] Rotary steerable drilling technology has unique advantages in drilling extended reach wells and branch wells. Rotary steerable drilling technology is a new drilling technology developed in the 1990s with rotary steerable drilling tools as the core, which can effectively make up for the shortcomings of sliding steering drilling tools. The eccentric actuator is one of the core components of the rotary steerable drilling system. It is the main body of the downhole part of the rotary steerable drilling tool, which is a controllable eccentric installed above the drill bit. Usually, the steering unit has three independently adjustable ribs, which can be extended radially under the action of the pushing force of the hydraulic drive mechanism, so that the ribs are clo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B4/00
Inventor 蒋世全姜伟付鑫生李汉兴刘慧恩牛海峰
Owner CHINA NAT OFFSHORE OIL CORP
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