Measuring and testing – Borehole or drilling – Downhole test
Patent
1985-05-02
1987-08-11
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
731515, 175 39, E21B 4400, E21B 4700
Patent
active
046853294
ABSTRACT:
In a method of assessing drilling conditions during a drilling operation measurements of torque applied (TOR), weight on bit (WOB), rate of penetration (ROP), and rotation speed (ROT) are gathered. Computed therefrom is a history (60, 61) of points (x, y) where x=(TOR/WOB) and y=(ROP/ROT).sup..gamma. : .gamma. being a derived constant indicative of down hole geometry. Trends in this history are monitored to assess drilling conditions. For example in soft plastic rock migration 62 towards the origin and in hard plastic rock migration 63 towards the abscissa is indicative of drill bit wear.
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T. M. Warren, "Factors Affecting Torque for a Roller Core Bit" Sep. 1984, pp. 1500-1508, J. of Pet. Tech., vol. 36, No. 10.
Deily et al., New Drilling-Research Tool Shows What Happens Down Hole, 1-8-68, Oil and Gas Journal vol. 492, No. 66, pp. 55-64.
Myracle Jerry W.
Oldham Scott M.
Schlumberger Technology Corporation
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