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Directional drilling control using periodic perturbation of the drill bit

a directional drilling and control technology, applied in the direction of directional drilling, borehole/well accessories, survey, etc., can solve problems such as complicated directional drilling

Inactive Publication Date: 2010-07-01
PRECISION ENERGY SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directional drilling is complicated by the necessity to operate a drill bit steering device within harsh borehole conditions.

Method used

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  • Directional drilling control using periodic perturbation of the drill bit
  • Directional drilling control using periodic perturbation of the drill bit
  • Directional drilling control using periodic perturbation of the drill bit

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Experimental program
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Embodiment Construction

[0021]This invention comprises apparatus and methods for steering the direction of a borehole advanced by cutting action of a rotary drill bit. The invention, which is disclosed with three embodiments, will be discussed in sections. The first section is directed toward hardware. The second section details basic operating principles of the invention. The third section details the three embodiments of the invention that will produce the desired borehole steering results.

[0022]Directional drilling is obtained by periodically perturbing the action of the drill bit. For purposes of this disclosure “periodic variation” is defined as varying the drill bit rotation speed in a plurality of 360 degree drill string rotations or “cycles” at the same azimuthal arc in the plurality of rotations.

Hardware

[0023]Attention is directed to FIG. 1, which illustrates a borehole assembly (BHA) 10 suspended in a borehole 30 defined by a wall 50 and penetrating earth formation 36. The upper end of the BHA 10...

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PUM

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Abstract

A system for steering the direction of a borehole advanced by cutting action of a rotary drill bit by periodically varying action of a drill bit while continuously rotating a drill string to which the drill bit is operationally attached. The steering system comprises a bit perturbation device cooperating with a bent housing subsection and operationally connected to the drill string and to the drill bit. Drill bit action is varied by periodic varying the rotation speed or rate of penetration of the drill bit. Periodic drill bit action results in preferential cutting of material from a predetermined arc of the borehole wall which, in turn, resulting in borehole deviation. Action of the drill bit can be varied independent of the rotation rate of the drill string

Description

[0001]This disclosure is related to U.S. patent application Ser. No. 11 / 848,328 filed on Aug. 31, 2008, which is hereby entered by reference.FIELD OF THE INVENTION[0002]This invention is related to the directional drilling of a well borehole. More particularly, the invention is related to steering the direction of a borehole advanced by a rotary drill bit by periodically perturbing the action of the drill bit during a revolution of the drill string to which the drill bit is operationally connected thereby allowing borehole trajectory to be controlled during continuous drill string rotation.BACKGROUND[0003]The complex trajectories and multi-target oil wells require precision placement of well borehole path and the flexibility to continually maintain path control. It is preferred to control or “steer” the direction or path of the borehole during the drilling operation. It is further preferred to control the path rapidly during the drilling operation at any depth and target as the bore...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B7/08E21B44/00E21B7/04
CPCE21B7/067E21B7/068E21B44/005
Inventor FARLEY, STEVEN REIDLARRONDE, MICHAEL LOUISBARTEL, ROGER P.MAULDIN, CHARLES LEEAIELLO, ROBERT ANTHONY
Owner PRECISION ENERGY SERVICES
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