Methods and apparatus for controlled directional drilling of boreholes
An apparatus adapted for controlling the direction in which a borehole is being excavated is described and comprises: a body adapted to be coupled to rotatable earth-boring apparatus and dependently supported in a borehole from a tubular drill string in which a drilling fluid is circulating; first means cooperatively arranged on the body and adapted for dividing a drilling fluid circulating in a tubular drill string supporting the body into at least two fluid streams to be respectively discharged from rotating earth-boring apparatus coupled to the body and into angularly-spaced sectors of a borehole being excavated; and second means cooperatively arranged on the body. A method is described for selectively excavating an inclined borehole with rotatable earth-boring apparatus suspended from a tubular drill string having a drilling fluid circulating therethrough. The earth-boring apparatus has fluid passages respectively arranged therein for discharging a stream of the drilling fluid into an adjacent sector of the inclined borehole as the earth-boring apparatus is being advanced.
- Assignee:
- Schlumberger Technology Corp., New York, NY
- Patent Number(s):
- US 4637479
- OSTI ID:
- 6904131
- Country of Publication:
- United States
- Language:
- English
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AZIMUTH
BOREHOLES
CAVITIES
DIRECTIONAL DRILLING
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUID FLOW
FLUIDS
INCIDENCE ANGLE
INCLINATION
MOTION
NATURAL GAS WELLS
OIL WELLS
PIPES
ROTATION
WELLS