Measuring and testing – Borehole or drilling – Downhole test
Patent
1989-03-13
1990-08-14
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
374136, 436 29, E21B 4706
Patent
active
049476823
ABSTRACT:
Oil and gas horizons in a wellbore are located by establishing from thermal logs thermal gradients for successive intervals free of drilling-induced thermal disturbances, identifying the mineral abundances surrounding the wellbore at each of said intervals, establishing ideal thermal conductivities for said mineral abundances based on assumptions that sand-rich formations have high thermal conductivities and are water-bearing and that shale-rich formations have low conductivities, determining an ideal heat flow at each interval by multiplying the thermal gradient at such interval by the ideal thermal conductivity of the mineral abundances at the interval, determining the average ideal heat flow for all of the intervals, and identifying the zones of the wellbore exhibiting anomalous ideal heat flows that are higher than the average heat flow.
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Williams, C. F., Anderson, R. N., and Broglia, C., "In Situ Investigations of Thermal Conductivity, Heat Production, and Past Hydrothermal Circulation in the Cajon Pass Scientific Drill Hole," Geophys. Res. Lett., 15, 9, 1988, pp. 985-988.
Anderson Roger N.
Williams Colin F.
O'Shea Kevin D.
The Trustees of Columbia University in the City of New York
Williams Hezron E.
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