Bi-center bits for drilling and underreaming moving salt
Conference
·
OSTI ID:7076133
This paper describes the design and use of a bicenter bit while drilling/underreaming a moving salt zone. The bit was based on the end of a 16 in. underreamer to drill an 11-3/8 in. pilot hole. When rotation was stopped, the bi-center design allowed the bit to gauge only 10-5/8 in., eliminating all pilot hole drag. Consequently, drilling/underreaming a thick, fast moving salt zone was accomplished efficiently without any indication of getting stuck in the pilot hole. Fast moving salt formations require special drilling techniques. Recently, a method for drilling and underreaming at the same time was developed. Although successful, the original method required clearing the bit from the pilot hole after drilling only six inches or being on bottom for six minutes. This was necessary to insure that the salt had not moved in far enough to stick the bit in the pilot hole. Even with this ''six-inch or six-minute'' limit, pilot hole drag always ranged between 10,000 lbs and 100,000 lbs with a constant potential of becoming stuck. Additionally, this method resulted in lengthy drilling times through the salt. The bi-center bit described herein, substantially improved drillin/underreaming: pilot hole drag was eliminated, bit sticking was non-existent and conventional ''drilling ahead'' was possible without clearing the pilot hole.
- OSTI ID:
- 7076133
- Report Number(s):
- CONF-861080-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
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42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
BOREHOLES
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DRILL BITS
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NATURAL GAS WELLS
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020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
BOREHOLES
CAVITIES
DESIGN
DRAG
DRILL BITS
DRILLING
DRILLING EQUIPMENT
DRILLS
EFFICIENCY
EQUIPMENT
GEOLOGIC DEPOSITS
MASS TRANSFER
MOTION
NATURAL GAS WELLS
OIL WELLS
PERFORMANCE
ROCK DRILLING
ROTARY DRILLING
ROTARY DRILLS
SALT DEPOSITS
WELL DRILLING
WELLS