Full-scale laboratory drilling tests on sandstone and dolomite. Final report
- Author
- Black, A. D.
- Published
- United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977. - Physical Description
- microfiche : negative ; 11 x 15 cm
- Additional Creators
- Green, S. J. (Sidney J.) and Rogers, L. A.
- Summary
- Full-scale laboratory drilling experiments were performed under simulated downhole conditions to determine what effect changing various drilling parameters has on penetration rate. The two rock types, typical of deep oil and gas reservoirs, used for the tests were Colton Sandstone and Bonne Terre Dolomite. Drilling was performed with standard 7/sup 7///sub 8/ inch rotary insert bits and water base mud. The results showed the penetration rate to be strongly dependent on bit weight, rotary speed, and borehole mud pressure. There was only a small dependence on mud flow rate. The drilling rate decreased rapidly with increasing borehole mud pressure for borehole pressures up to about 2,000 psi. Above this pressure, the borehole pressure and rotary speeds had a smaller effect on penetration rate. The penetration rate was then dependent mostly on the bit weight. Penetration rate per horsepower input was also shown to decrease at higher mud pressures and bit weights. The ratio of horizontal confining stress to axial overburden stress was maintained at 0.7 for simulated overburden stresses between 0 and 12,800 psi. For this simulated downhole stress state, the undrilled rock sample was within the elastic response range and the confining pressures were found to have only a small or negligible effect on the penetration rate. Visual examination of the bottomhole pattern of the rocks after simulated downhole drilling, however, revealed ductile chipping of the Sandstone, but more brittle behavior in the Dolomite.
- Report Numbers
- BERC/RI-77/18
- Other Subject(s)
- 02 PETROLEUM
- 020300* - Petroleum- Drilling & Production
- 03 NATURAL GAS
- 030300 - Natural Gas- Drilling, Production, & Processing
- 42 ENGINEERING
- 422000 - Engineering- Mining & Underground Engineering- (1980-).
- ALKALINE EARTH METAL COMPOUNDS
- CARBON COMPOUNDS
- CARBONATE ROCKS
- CARBONATES
- DOLOMITE
- DRILLING FLUIDS
- DRILLING
- MAGNESIUM CARBONATES
- MAGNESIUM COMPOUNDS
- MINERALS
- NATURAL GAS WELLS
- OIL WELLS
- OXYGEN COMPOUNDS
- PERFORMANCE TESTING
- RESERVOIR ROCK
- ROCK DRILLING
- ROCKS
- SANDSTONES
- SEDIMENTARY ROCKS
- STRESSES
- TESTING
- TIME DEPENDENCE
- WELL DRILLING
- WELLS
- Collection
- U.S. Atomic Energy Commission depository collection.
- Note
- OSTI Identifier 5417048
Research organization: Terra Tek, Inc., Salt Lake City, Utah (USA).
View MARC record | catkey: 40546072