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Statistical Analysis of Field Performance
During the period 1993-1996, more than twenty wells were drilled in the Brazos
County, Texas area using Security DBS PDC bits equipped with Vortexx® nozzles.
A large historic database of offsets was used for performance analysis. The
range of true vertical depth (TVD) was from 9,700 ft. to over 18,000 ft Most
of the runs were in the TVD range of 11,000 to 13,000 ft. The best comparative
data came from a group of 23 wells that were comparable to three Vortexx® test
wells. Drilling data showed an average 22% increase in rate of penetration (ROP) including the
outlier data, and over a 40% increase excluding the outliers.
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Laboratory Testing
Independent laboratory tests at Amoco's facility in Tulsa, Oklahoma and
TerraTek in Salt Lake City, Utah, confirm increases in rate of penetration (ROP) consistent with
field performance studies. In all tests the only variable was the Vortexx®
nozzle.
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