Rotary drill string directional drilling short section and drilling method

A directional drilling and sub-joint technology, which is used in directional wells, sub-joints for directional drilling operations in horizontal wells, and drilling fields, can solve the problems of shortening the ratio of drill string rotation, instability of screw drilling tools, affecting friction reduction and speed increase, etc. , to reduce friction, reduce the risk of sticking, and reduce friction

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the drill string installed under the switch is about 300 meters long. The friction of the drill string is greatly affected by the movement state and the downhole environment. During work, the friction force often changes, ca...

Method used

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  • Rotary drill string directional drilling short section and drilling method
  • Rotary drill string directional drilling short section and drilling method
  • Rotary drill string directional drilling short section and drilling method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing.

[0033] figure 1 Schematically shows a rotatable drill string directional drilling sub according to an embodiment of the present invention. The rotatable drill string directional drilling sub according to the invention can especially be used for drilling horizontal wells or directional wells.

[0034] Such as figure 1 As shown, the pup joint of this embodiment includes a housing 10 . In this embodiment, the housing 10 is cylindrical. A cylinder body 20 is disposed inside the casing 10, and the cylinder body 20 is also cylindrical. The nipple of this embodiment also includes a switch assembly 40 . The switch assembly 40 is configured to separate the cylinder body 20 from the casing 10 for relative rotation when turned on, and connect the cylinder body 20 and the casing 10 for synchronous rotation when turned off. The pup joint of this embodiment also includes a well wal...

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Abstract

The invention relates to a rotary drill string directional drilling short section and a drilling method, and belongs to the field of drilling tools. The drilling section comprises a shell, a cylinderbody arranged in the cylinder body shell, a switch assembly configured to enable the cylinder body and the shell to be separated and make relative rotation when the switch assembly is opened and to enable the cylinder body and the shell to be connected and make synchronous rotation when the switch assembly is closed, and a well wall friction mechanism, wherein the well wall friction mechanism comprises a first connector connected with the cylinder body and a movable piece arranged in the first connector, and the movable piece is configured to move in the radial direction according to the displacement of the drilling fluid flowing through the short section, so that different friction forces are selectively applied to the well wall. During directional drilling, a switch is turned on, a drillrod can be driven by a rotary disc to rotate, the reaction torque of a screw drilling tool below the short section is balanced by the friction force generated by the well wall friction mechanism, thetool face is in a stable state, the effect of directional drilling of a rotatable drill column is achieved, and therefore the underpinning effect is effectively reduced, and the mechanical drilling speed is increased.

Description

technical field [0001] The invention relates to a directional drilling nipple with a rotatable drill string, in particular to a nipple used in directional drilling operations of directional wells and horizontal wells. The invention also relates to a drilling method. Background technique [0002] In directional wells and horizontal wells, the wellbore trajectory is mainly controlled by screw drilling tools. Generally speaking, the drill string does not rotate to ensure the stability of the tool face of the screw drilling tool. However, this will result in greater axial friction between the drill string and the borehole wall. Especially for horizontal wells with long horizontal sections and extended reach wells, axial friction will lead to problems such as poor transmission of drilling pressure and low ROP. [0003] Chinese patent document 201620363357.0 discloses a downhole pipe string rotation control switch, which includes an upper joint, a switch assembly, a housing and...

Claims

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Application Information

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IPC IPC(8): E21B17/02E21B21/08E21B7/04
Inventor 郑德帅冯江鹏豆宁辉赵晨熙胡亮
Owner CHINA PETROLEUM & CHEM CORP
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