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Abstract
Hydraulic fracturing and cyclic hydraulic jacking (step-pressure) tests were used to determine the virgin stress normal to six natural joints in grantic rocks. A numerical model was used to analyse the coupled problem of fluid flow and rock/fracture deformation during the field tests. Fracture closure and virgin normal stress was determined from the zero-flow pressure in a well pressure-well flow diagram. The cyclic hydraulic jacking tests gave a zero-flow pressure in close agreement with both the shut-in pressure and the weight of the overburden rock for four out of six tested joints. For the two remaining joints the virgin normal stress could be estimated by a linear extrapolation to zero-flow rate. The zero-flow pressure is clearly defined and is insensitive to the transmissivity and non-linear normal stiffness of the fracture near the wellbore. Cyclic hydraulic jacking is therefore an alternative to traditional shut-in analysis when shut-in pressure is difficult to determine.
Published Version
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Schedule a callMore From: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
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