Measuring and testing – Borehole or drilling – Downhole test
Patent
1975-01-15
1976-09-28
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
73155, E21B 4700
Patent
active
039824322
ABSTRACT:
Described is a system for automatically recording information about the physical condition, content and location of earth formations penetrated during drilling of a well, the rate of drilling the well, the well depth, the condition and content of the drilling fluids, and procedures followed in the drilling operation. Immediate visual displays are provided which permit comparisons between graphically recorded input and output data representing, respectively, the condition and content of an identified sample of drilling fluid as it enters the formation from the drill bit and the same fluid sample after it has returned to the well surface. To this end, the volume, or "lag", of fluid required to pump a sample of fluid from the drill bit to the well surface is determined and means are provided to automatically determine the amount of fluid injected into the well between each incremental unit of advance of the drill bit. The input data is graphically recorded on a first strip chart which advances at the rate of advance of the drill bit while the output data is graphically recorded on a second strip chart which advances, after the lag, as a function of the volume of the returning drill fluid. The display of the information on the first chart is delayed relative to the second chart in an amount sufficient to graphically align the output and input data representing the same identified sample of drill fluid.
REFERENCES:
patent: 2806372 (1957-09-01), Arps
patent: 3462761 (1969-08-01), Horeth et al.
patent: 3512164 (1970-05-01), Bynum
patent: 3750766 (1973-08-01), Thompson et al.
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