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A Study to Determine the Optimum Bit Offset At Various Drilling Depths, Topical Report; December 1978

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Tests were performed using a single roller cone from a 4 3/4 inch diameter modified chisel bit to evaluate the effects of _cutter offset 11 skew 11 on drill bit cutting efficiency at depth. Drilling experiments were conducted using Colton Sandstone (11 percent porosity and 50 microdarcy permeability). Tests were performed at simulated depths ranging from 0 to 20,000 feet using six different offsets (0 to .24 inches) and two different penetrations(0.05 and 0.1 inches). A .single revolution of the cone arm was made with torque, thrust and the resulting removed volume recorded. The application of test results to future drill bit design are discussed...


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Citation Terra Tek, I., United States. Dept. of Energy. Technical Information Center., & Bartlesville Energy Technology Center. (1978). A study to determine the optimum bit offset at various drilling depths. [Washington] : Springfield, Va.: Dept. of Energy, [Office of the Assistant Secretary for Intergovernmental and Institutional Relations], Technical Information Center.
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