Rotary steerable system for vertical drilling

a technology of vertical drilling and steerable equipment, which is applied in the direction of surveying, directional drilling, and well accessories, etc., can solve the problems of high cost, ineffective cost, and high cost of current steerable drilling equipment, and it is costly for operators to have both conventional drilling systems

Inactive Publication Date: 2014-09-18
WEATHERFORD TECH HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current steerable drilling systems have expensive steerable equipment and are not cost effective when drilling generally vertical wellbores that do not require the steerable capabilities.
It is costly for operators to have both conventional drilling systems for drilling generally vertical wells and steerable drilling systems for drilling deviated wellbores, and switching between the two drilling systems as necessary.

Method used

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  • Rotary steerable system for vertical drilling
  • Rotary steerable system for vertical drilling
  • Rotary steerable system for vertical drilling

Examples

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Embodiment Construction

[0018]Embodiments of the invention relate to a rotary steerable drilling system for drilling wellbores. The system is operable to maintain a substantially vertical wellbore drilling path. If the system begins to deviate from the vertical drilling path (due to the wellbore formation characteristics for example), then the system is operable to automatically self correct and force the system back toward the vertical drilling path trajectory.

[0019]The system may be a self contained, electronically controlled, push bit system. The system may be rotated from the surface and / or may include conventional mud motors for providing additional rotational drill bit speed. The system may include one or more individually controllable and replaceable bias pads operable to force or push the drill bit in a desired direction. The bias pads may allow direction control of up to 5 percent over-gauge of the wellbore diameter. In the event of a failure, the system is designed to have a natural drop tendency...

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PUM

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Abstract

A rotary steerable drilling system that is operable to drill vertical wellbores and automatically maintain a vertical wellbore drilling path. The system includes a control module for operating solenoid valves that control an amount of fluid pressure applied to bias pad piston / cylinders. The control module is operable to determine when the system is deviating from vertical, in what direction the system is deviating, and where the bias pads are in relation to the direction of deviation. Based on these determinations, the control module actuates the requisite bias pads by controlling the amount of fluid pressure applied to the bias pad piston / cylinders to direct the system back to the vertical drilling path.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]Embodiments of the invention generally relate to steerable drilling systems for drilling vertical wellbores.[0003]2. Description of the Related Art[0004]Directional drilling involves varying or controlling the direction of a wellbore as it is being drilled. Usually the goal of directional drilling is to reach or maintain a position within a target subterranean destination or formation with the drilling string. For instance, the drilling direction may be controlled to direct the wellbore towards a desired target destination, to control the wellbore horizontally to maintain it within a desired payzone, or to correct for unwanted or undesired deviations from a desired or predetermined path.[0005]Thus, directional drilling may include deflection or deviation of a wellbore along a predetermined or desired path in order to reach or intersect with, or to maintain a position within, a specific subterranean formation or target. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B7/10E21B17/10
CPCE21B17/1014E21B7/10E21B44/00E21B7/062E21B45/00E21B47/024E21B47/12E21B47/18G01D5/145
Inventor MARSON, DANIEL ANDREWSULLIVAN, DANIEL MARKPAGETT, JOHN MACKINLEY
Owner WEATHERFORD TECH HLDG LLC
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