Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1996-05-10
1998-04-07
Tsay, Frank
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 74, E21B 708
Patent
active
057353573
ABSTRACT:
A bottom hole assembly for use with coil tubing for drilling, comprising a mud motor having a housing that is bent at its lower end, an output shaft extending through the bent housing, a drill bit connected to the output shaft to be rotated as drilling mud is pumped through the mud motor, a rotator having a torque tube that is connected to the housing of the mud motor to allow the rotator to rotate the housing of the mud motor to change the orientation of the bent section of the housing as required to drill in the desired direction, a steering tool having a housing connected to the housing of the rotator and a central mandrel that is connected to the torque tube of the rotator so that the sensors of the steering tool will be rotated by the rotator the same angular distance as the bent housing so that the orientation of the sensors in the steering tool and the bent housing is always the same.
The rotator rotates the steering tool and the mud motor an incremental distance by using mud pressure to move a piston to cause cam arms that are in engagement with an internal ratchet to rotate a torque tube connected to the mandrel of the steering tool and the housing of the motor an incremental distance. The torque tube is rotated the same incremental distance each time the pressure is reduced and increased in the rotator.
REFERENCES:
patent: 3799277 (1974-03-01), Kellner
patent: 4076084 (1978-02-01), Tighe
patent: 4811798 (1989-03-01), Falgout, Sr. et al.
patent: 5232058 (1993-08-01), Morin et al.
patent: 5259467 (1993-11-01), Schoeffler
patent: 5311925 (1994-05-01), Eddison et al.
patent: 5339913 (1994-08-01), Rives
patent: 5450914 (1995-09-01), Coram
patent: 5503235 (1996-04-01), Falgout, Sr.
Radius Metier, Inc.
Tsay Frank
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