Rubber drillpipe protectors reduce rotary torque

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7159729

Corbett, K T; Dawson, R

Rubber drill-pipe protectors have very low friction coefficients when rotating against smooth or polished casing surfaces in drilling mud. A polished casing surface can be obtained by placing one protector on each joint of drill pipe run inside the casing. In this situation, casing polishing will occur in the course of normal drilling, and the resulting low friction coefficients will lead to reduced drilling torques in directional wells. The friction coefficient between casing and drill-pipe protectors is controlled by the roughness of the casing surface. Coefficients range from .50 for badly rusted casing to .05 for a polished surface. The smooth casing surface needed for low friction will be obtained during 50-100 hours of rotation with drill-pipe protectors inside the casing. A field test of this concept gave friction coefficients below .10 and a significant reduction in drilling torque.

• Research Organization: Exxon Production Research Co.
• OSTI ID: 7159729
• Report Number(s): CONF-861080-
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
CHEMICAL REACTIONS
CORROSION
DIRECTIONAL DRILLING
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
ELASTOMERS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FIELD TESTS
FLUIDS
FRICTION FACTOR
NATURAL GAS WELLS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PIPES
POLISHING
POLYMERS
ROUGHNESS
RUBBERS
SURFACE FINISHING
SURFACE PROPERTIES
TESTING
TORQUE
WELL CASINGS
WELLS