Lateral downhole drilling tool

Details Lateral downhole drilling tool Lateral downhole drilling tool

2005-08-05

2009-02-10

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S079000, C166S117500

Reexamination Certificate

active

07487847

ABSTRACT:
A flexible lateral drilling shaft is disclosed, having a concentrically nested arrangement of two or more coil springs of which the winding direction of at least one of the springs is opposite to another of the springs. The shaft is included within a lateral drilling tool which includes a deflection assembly having roller bearings to assist the deflection of the flexible shaft. Once inserted into a wellbore, increasing pressure applied to the shaft will cause the opposing springs to stiffen against each other, providing sufficient strength to support the drilling of a lateral drainhole within the wellbore. Further, the spring is wound from a steel wire having a specific noncircular profile to improve the strength characteristics of the shaft without increasing the bending stress during deflection.

REFERENCES:
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patent: 4051908 (1977-10-01), Driver
patent: 4527639 (1985-07-01), Dickinson et al.
patent: 5052404 (1991-10-01), Hodgson
patent: 5439066 (1995-08-01), Gipson
patent: 6220372 (2001-04-01), Cherry
patent: 6283230 (2001-09-01), Peters

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