Pressure Transient Analysis for Large Scale Hydraulic Injections in the Carnmenellis Granite, England
Large volume hydraulic injections into the Carnmenellis granite have been completed at the CSM Hot Dry Rock Project during the period October 1982 to July 1983, with small volume injections before and after this period. The effects of the injections on the hydraulic properties of the rock mass have been estimated by pressure transient analysis. The growth of the reservoir zone was tracked with microseismic locations, and the growth mechanism modeled with the computer program FRIP. The limited duration of the transients amenable to analysis and the tendency for growth below the injection zone meant that the interpretations could only describe hydraulic conditions within about 100 m of the wellbores. The effect of the large volume injections was to increase permeability values from less than 100 {micro}d to greater than 5 md, and to decrease skin values from about -3 to about -6. The FRIP modeling explained the observed reservoir growth in plan with reference to measured in-situ stresses, jointing and rock properties and showed some of the limitations of continuum modeling.
- Research Organization:
- Golder Associates & Camborne School of Mines Geothermal Energy Project, Cornwall, England
- Sponsoring Organization:
- USDOE - Office of Energy Efficiency and Renewable Energy (EE)
- DOE Contract Number:
- AT03-80SF11459
- OSTI ID:
- 889769
- Report Number(s):
- SGP-TR-74-52
- Country of Publication:
- United States
- Language:
- English
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