Steerable tool underreaming system

Details Steerable tool underreaming system Steerable tool underreaming system

1990-08-20

1991-10-29

Neuder, William P.

Boring or penetrating the earth

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

Sectional guide or shaft having means to lock sections in...

175 76, 175267, E21B 708

Patent

active

050607367

ABSTRACT:
A bottom hole assembly is described having a bit driven by a downhole motor and stabilizers located above the motor on the drill string. A subassembly is also provided for controlling the bit trajectory that is operational on demand at the rig site. The subassembly comprises an underreamer located directly above the bit. The underreamer is hydraulically actuated to retract and extend the cutters.

REFERENCES:
patent: 4465147 (1984-08-01), Feenstra et al.
patent: 4660657 (1987-04-01), Furse et al.
patent: 4667751 (1987-05-01), Geczy et al.
patent: 4697651 (1987-10-01), Dellinger
patent: 4817740 (1989-04-01), Beimgraben
patent: 4877092 (1989-10-01), Helm et al.
patent: 4886130 (1989-12-01), Evans
patent: 4932482 (1990-06-01), DeLucia
SPE Paper No. 13026, "PDM Versus Turbo-Drill: A Drilling Comparison", 1984.

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