Abstract
In 1979, methods were established for analyzing formation properties before a hydraulic stimulation (prefracturing test) and for interpreting fracturing pressure behavior during treatment (slope analysis). These methods were used as a basis in writing software for an on-site computer system. Since 1980, this system has been used for prefracturing test analyses (in the form of step rate, flow-back, and pressure decline tests) and for monitoring hydraulic fracturing treatments (in the form of real-time graphics of surface parameters and downhole pressures). This information was then applied to improving quality control and job design.
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