This paper discusses the analysis of production data from hydraulically fractured horizontal wells in tight, heterogeneous formations. We consider horizontal wells with longitudinal and transverse hydaraulic fractures, which might be surrounded by a region with natural fractures. These well-reservoir configurations are of interest in many unconventional reservoirs, including tight-gas sands and shale-oil or gas formations. A semi-analytical model that can incorporate the key features of reservoir heterogeneity and the details of hydraulic fracture and wellbore flow is used to compute production decline. Production decline characteristics are presented in terms of transient productivity index. Computation of transient productivity index from field data and the analysis of production decline by transient productivity index are explained. Example applications of production data analysis for fractured horizontal wells in tight, heterogeneous formations are presented.

Keywords:
Drillstem Testing, field data, production data, hydraulic fracture, hydraulic fracturing, compressibility, productivity index, semi-analytical model, production decline, Ozkan
Subjects:
Drilling Operations, Hydraulic Fracturing, Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, Fluid Characterization, Reservoir Fluid Dynamics, Reservoir Simulation, Formation Evaluation & Management, Unconventional and Complex Reservoirs, Directional drilling
Copyright 2007, Society of Petroleum Engineers
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