Measuring and testing – Borehole or drilling – Downhole test
Patent
1986-10-07
1988-08-02
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
364422, E21B 4700
Patent
active
047607351
ABSTRACT:
Drilling conditions are analyzed by, for example, measuring the torque applied at the surface to the drill string and the effective torque acting on the drill bit. The applied torque and effective torque are compared to determine torque loss. Likewise, applied weight on the drill string and effective weight acting on the drill bit may be measured and compared to determine drag losses. These measurements and comparisons may be done in real-time to diagnose unfavorable drilling conditions. The torque or weight measurements may be used to calculate a variable coefficient of friction acting on the drilling string. Trends in the torque or weight losses, or in the value of the coefficient of friction, may be observed on a plot of these quantities as a function of depth.
REFERENCES:
patent: 4064749 (1977-12-01), Pittman et al.
patent: 4384483 (1983-05-01), Dellinger et al.
patent: 4549431 (1985-10-01), Soeiinah
patent: 4597289 (1986-07-01), Obrecht
T. M. Warren, "Factors Affecting Torque for a Roller Cone Bit" Journal of Petroleum Technology, Sep. 1984.
C. A. Johnancsik, D. B. Friesen, and R. Dawson, "Torque and Drag in Directional Wells-Prediction and Measurement," IADC/SPE 11380, Feb. 20-23, 1983.
Sheppard Michael C.
Wick Christian
Anadrill, Inc.
Borst Stephen L.
Myracle Jerry W.
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