Drag bit performance modeling
Models for the forces required to remove a fixed volume of rock with a single cutter have been applied to different polycrystalline Diamond Compact (PDC) bit designs. The integration of the forces for each cutter over the bit face gives the torque and weight-on-bit (WOB) required for a particular rate-of-penetration (ROP). This paper presents the results of comparing such a model to laboratory drilling tests for four radically different bit designs in four different rocks. The geometry of each cutter on the bit was determined by detailed measurements of the bit with a 3-axis coordinate measuring machine. Drilling tests were conducted by ''reaming'' rock with an 8-1/2'' bit that had been previously drilled with a 6-1/4'' bit. Only the peripheral cutters engaged the rock during the reaming. Additional tests were conducted where the WOB and torque were recorded while drilling a pilot hole into the top of a flat rock and drilling through two different bed boundaries with constant ROP. The model predictions compared well to the measured data for both the reaming tests and the pilot hole tests.
- Research Organization:
- Amoco Production Co.
- OSTI ID:
- 7159651
- Report Number(s):
- CONF-861080-
- Resource Relation:
- Conference: Society of Petroleum Engineers annual technical conference and exhibition, New Orleans, LA, USA, 5 Oct 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
42 ENGINEERING
DRILL BITS
DRAG
MATHEMATICAL MODELS
PERFORMANCE
RESPONSE FUNCTIONS
WELL DRILLING
BOUNDARY CONDITIONS
COMPARATIVE EVALUATIONS
DESIGN
DIAMONDS
MECHANICAL EFFICIENCY
MECHANICAL TESTS
NATURAL GAS WELLS
OIL WELLS
POLYCRYSTALS
ROCK MECHANICS
TORQUE
WEIGHT
CARBON
CRYSTALS
DRILLING
DRILLING EQUIPMENT
EFFICIENCY
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
FUNCTIONS
MATERIALS TESTING
MECHANICS
MINERALS
NONMETALS
TESTING
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)