PORE-PRESSURE PLOT ACCURACY INCREASED BY MULTIPLE TREND LINES

Joe Foster Jr. M-1 Drilling Fluids Co. Houston A detailed, computer-assisted procedure has been developed for plotting pore pressures from electric logs. This new procedure differs from the traditional procedure in two ways. For atypical 10,000-ft well, 200-250 data points are plotted instead of the traditional 10-30 data points. The new procedure also uses multiple compaction trend lines instead of a single compaction trend line. This provides a separate trend line for each geologic age and

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