Apparatus for extended straight line drilling from a curved bore

Details Apparatus for extended straight line drilling from a curved bore Apparatus for extended straight line drilling from a curved bore

1982-03-22

1984-02-21

Purser, Ernest R.

Boring or penetrating the earth

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

Normally curved guide or shaft

175107, 175100, 415502, E21B 402, E21B 708

Patent

active

044324235

ABSTRACT:
Apparatus by which a vertical borehole is curved to a new angle and extended through a production reservoir. A vertical borehole of a suitable diameter is extended downhole to the proximate depth of the production reservoir. A Zublin drill guide apparatus is employed to drill a curved section of the hole, thereby turning the borehole to a desired angle so that the lower marginal end of the borehole is directed laterally away from the vertical part of the borehole. A drill pipe string is positioned within the vertical part of the borehole. A flexible pipe is fitted to the downhole end of the drill pipe string, and a Zublin straight drill guide assembly is fitted to the end of the flexible pipe. A motor, such as an expansible gas turbine motor, for example, is connected to the end of the straight drill guide assembly. A suitable drill bit is connected to be rotated by the turbine motor. Compressible fluid is applied to the upper end of the string at the surface of the ground and drives the turbine motor, which in turn rotates the drill bit. A fluid reaction system associated with the turbine motor provides a turning moment in opposition to the rotating bit while concurrently forcing the bit forward to penetrate the formation.

REFERENCES:
patent: 2336338 (1943-12-01), Zublin
patent: 2778603 (1957-01-01), McCune et al.
patent: 3786875 (1974-01-01), Merle
patent: 3844362 (1974-10-01), Elbert et al.

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