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 lab. 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 three-axis coordinate measuring machine. Drilling tests were conducted by reaming rock with an 8 1/2-in. (21.6-cm) bit that was previously drilled with a 6 1/4-in. (15.9-cm) bit. Only the peripheral cutters engaged the rock during reaming. Additional tests were conducted in which the WOB and torque were recorded during drilling of a pilot hole into the top of a flat rock and during drilling through two different bed boundaries with constant ROP. The model predictions compared well to the measured data for both the reaming and pilot-hole tests.
- Research Organization:
- Amoco Production Co. (US)
- OSTI ID:
- 5904086
- Journal Information:
- SPE (Society of Petroleum Engineers) Drill. Eng.; (United States), Vol. 4:2
- Country of Publication:
- United States
- Language:
- English
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DRILL BITS
DESIGN
OIL WELLS
CUTTING TOOLS
ROCKS
GEOMETRY
DATA ANALYSIS
DIAMONDS
DRAG
MEASURING INSTRUMENTS
PERFORMANCE TESTING
POLYCRYSTALS
SCALE MODELS
CARBON
CRYSTALS
DRILLING EQUIPMENT
ELEMENTAL MINERALS
ELEMENTS
EQUIPMENT
MATHEMATICS
MINERALS
NONMETALS
STRUCTURAL MODELS
TESTING
TOOLS
WELLS
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Geology
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