Abstract
This paper describes results of six microfracturing experiments in a gas well in South Texas. The experiments were conducted in open-hole and during the drilling operation. Microfracturing consisted of pumping very small volumes of drilling mud (tens of gallons) at very low rates (3-30 gpm). Three of these microfractures extended below the bottom of the hole and were cored out while obtaining oriented cores. Created fracture orientation was obtained from the fractures observed in the oriented core. Several instantaneous shut-in pressures were recorded in each zone. These showed variations of about 200-300 psi. This magnitude change is attributable to changes in the mechanical properties of each formation. Measured values of instantaneous shut-in pressure did not show any trend with lithology (shale or sandstone), mechanical properties, or tensile strength.
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