HDR reservoir analysis incorporating acoustic emission data
A set of models of HDR systems is presented which attempts to explain the formation and operation of HDR systems using only the in-situ properties of the fractured rock mass, the earth stress field, the engineering intervention applied by way of stimulation and the relative positions and pressures of the well(s). A statistical and rock mechanics description of fractures in low permeability rocks provides the basis for modeling of stimulation, circulation and water loss in HDR systems. The model uses a large number of parameters, chiefly simple directly measurable quantities, describing the rock mass and fracture system. The effect of stimulation (raised fluid pressure allowing slip) on fracture apertures is calculated, and the volume of rock affected per volume of fluid pumped estimated. The total rock volume affected by stimulation is equated with the rock volume containing the associated AE (microseismicity). The aperture and compliance properties of the stimulated fractures are used to estimate impedance and flow within the reservoir. Fluid loss from the boundary of the stimulated volume is treated using radial leak-off with pressure-dependent permeability.
- Research Organization:
- Tohoku University, Sendai, JP; National Institute for Resources and Environment, Ibaraki, JP; NEDO, Geothermal Energy Dept., Tokyo; Geothermal Energy Research and Development Co., Ltd., Tokyo, JP
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 889377
- Report Number(s):
- SGP-TR-150-21; TRN: US200619%%784
- Resource Relation:
- Conference: Proceedings, Twentieth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, January 24-26, 1995
- Country of Publication:
- United States
- Language:
- English
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