Downhole adjustable bent housing for directional drilling

a directional drilling and adjustable technology, applied in directional drilling, drilling machines and methods, borehole/well accessories, etc., can solve the problem of complex control schemes of the rotational position of each housing

Inactive Publication Date: 2008-01-01
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The above-described objects of the present invention, as well as other objects and advantages, are achieved by a downhole adjustable bent housing that is deployed and retracted by the driller by using the mud pumps located at the surface and used to circulate drilling mud in the well during the drilling process. The present invention does not require wires, cables or cumbersome reciprocation of the entire drillstring to deploy, lock or re-align the downhole adjustable bent housing, and the downhole adjustable bent housing is controllably deployed and realigned without a trip using

Problems solved by technology

These tools require complex schemes for cont

Method used

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  • Downhole adjustable bent housing for directional drilling
  • Downhole adjustable bent housing for directional drilling
  • Downhole adjustable bent housing for directional drilling

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Embodiment Construction

[0032]FIG. 1A shows a downhole adjustable bent housing 10 connected between a mud motor and a drill bit in accordance with the present invention. The downhole adjustable bent housing 10 in this configuration is set to have a slight downward angular deviation, thereby influencing the drill bit to drop angle, or turn downwardly, from its existing path. FIG. 1B shows how the downhole adjustable bent housing 10 may impart an upward angular deviation to the BHA that affects the angle of attack of the bit against the bore wall. The angular deviation imparted by the downhole adjustable bent housing 10 is a slight upward angular deviation thereby influencing the drill bit to build angle, or turn upwardly, from its existing path.

[0033]FIG. 2A shows the general configuration of a preferred embodiment of the downhole adjustable bent housing 10, in its inactive position. The downhole adjustable bent housing 10 has a mandrel housing 33 and a member housing 34 pivotally joined at a knuckle 35. Th...

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Abstract

The present invention provides a hydraulically actuated downhole adjustable bent housing for use in directional drilling of bore holes and wells that allows adjustment of the housing from aligned to a bent configuration without raising or lowering the drillstring. The present invention also provides a method of directionally drilling a bore hole or a well using an downhole adjustable bent housing that can be operated without raising or lowering the drillstring.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention provides a downhole adjustable bent housing for use in directional drilling of wells used to recover oil and gas, and a method for directionally drilling a well to recover oil and gas.[0003]2. Background of the Related Art[0004]Wells are generally drilled to recover natural deposits of hydrocarbons and other desirable, naturally occurring materials trapped in geological formations in the earth's crust. A slender well is drilled into the ground and directed to the targeted geological location from a drilling rig at the surface. In conventional “rotary drilling” operations, the drilling rig rotates a drillstring comprised of tubular joints of drill pipe connected together to turn a bottom hole assembly (BHA) and a drill bit that are connected to the lower end of the drillstring. The BHA typically comprises a number of downhole tools including adjustable bent housings, drill collars and mud motors, an...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B7/06E21B23/04
CPCE21B7/067E21B23/006E21B23/04E21B23/042
Inventor ASKEW, WARREN
Owner SCHLUMBERGER TECH CORP
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