Because the dependency of compaction on the rate of depletion is ignored, currently used procedures for predicting compaction are inaccurate. A partly analytical, partly empirical model is presented for calculating oil and gas production, subsurface compaction, and surface subsidence from compacting reservoirs with rate-dependent compressibilities and all major drive mechanisms active. A compacting Bolivar coast reservoir is simulated with excellent results.

Limitations include zero water production, piston-like gas and water influx, and negligible gravity drainage.

Keywords:
waal, assumption, loading rate, water influx, compressibility, compaction, performance prediction, drive index, tia juana field, equation
Subjects:
Reservoir Characterization, Reservoir Fluid Dynamics, Formation Evaluation & Management, Integration of geomechanics in models
Copyright 1991, Society of Petroleum Engineers
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