Drill string orienting tool

Details Drill string orienting tool Drill string orienting tool

1996-01-02

1997-09-23

Dang, Hoang C.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

1661177, 175256, 175322, E21B 704

Patent

active

056694571

ABSTRACT:
A drill string orienting tool for insertion into a well bore includes a housing that has a plurality of inwardly projecting splines. A mandrel is disposed within the housing. The orienting tool has two operating positions, a running position, and an orienting position. The housing is longitudinally moveable relative to the mandrel between the running position and the orienting position. The mandrel and the housing define an annular chamber that is vented to the exterior of the housing. A flexible metallic coiled tube is disposed within the annular chamber and contains hydraulic fluid. The upper end of the coiled tube is coupled to the housing and is in fluid communication with the first fluid chamber. The lower end of the coiled tube is coupled to the mandrel. The mandrel has outwardly projecting splines that are engageable with a corresponding set of inwardly projecting splines on the housing when the orienting tool is in the running position. A piston is movably disposed within the housing. The piston and the housing define a first fluid chamber, and a second fluid chamber. The second fluid chamber is vented to the exterior of the housing. Downward movement of the piston causes a positive pressure differential between the pressure inside the coiled tube and the pressure outside the coiled tube, thereby causing the coiled tube to uncoil and rotate the mandrel relative to the housing.

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