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Eight hydraulic fracturing experiments were conducted to calculate in-situ stress in the Cajon Pass Well, starting on March 9, 1987, and finishing on April 2, 1987. Four mechanical pressure gauges and one mechanical temperature gauge were used. These gauges measured pressure in the test interval, packer elements and open-hole, the temperature gauge measured temperature in the open-hole. These gauges were all used downhole while electronic gauges were used at the surface. The gauges record the pressure and temperature on coated metal charts that were removed after the test and digitized. The charts were digitized using a Kuster 2-way reader with encoder, PER interface, and an IBM Personal Computer. A single 5 1/4 inch disc was used to store all the digitized data. Along with the data, calibration information was also stored on the disc. These calibrations were used to convert the pressure/time deflections from inches of deflection into actual pressure in psi and time in minutes. A total of twenty-five records were digitized. Two of the charts contain records at two different depths, because the packers were moved to a second test interval and reset. The records that were digitized are used to determine the least principal in-situ stress, monitor status of the packer/bundle carrier assembly during the test, and reconstruct any unusual events or malfunctions that occurred downhole, while conducting the tests (see fig. 1). Figure 1. CAJON PASS HYDROFRAC SCHEDULE

u.s. geological survey open file report/open-file report

In-situ stress project Technical Report Number 7; The use of mechanical pressure and temperature gauges in hydraulic fracturing at the Cajon Pass well, California