Comparison of pressure-transient response in intensely and sparsely fractured reservoirs

Journal Article · Sun Dec 01 04:00:00 EST 1991 · SPE Formation Evaluation (Society of Petroleum Engineers); (United States)

DOI:https://doi.org/10.2118/18800-PA· OSTI ID:5606352

Johns, R T; Jalali-Yazdi, Y ^[1]

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1. Stanford Univ. (CA)

In this paper a comprehensive analytical model is presented to quantify the pressure-transient behavior of a naturally fractured reservoir with a continuous matrix-block-size distribution and interporosity skin. Geologically realistic probability density functions of matrix block size are used to represent reservoirs of varying fracture intensity and uniformity. Drawdown and interference type curves are developed with rectangular probability density functions. The results obtained extend previous dual-porosity models by incorporating fracture spacing variability. In the absence of interporosity skin, intensely and sparsely fractured reservoirs show distinctions in the pressure response. Uniformity of a fractured reservoir also significantly affects pressure responses, irrespective of the degree of fracture intensity. The pressure response in a nonuniformly fractured reservoir with large block-size variability, for example, can exhibit a nonfractured (homogeneous) reservoir response. The results may be used to estimate matrix-block-size variability and the degree of fracture intensity from drawdown and interference well tests.

• OSTI ID: 5606352
• Journal Information: SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Journal Name: SPE Formation Evaluation (Society of Petroleum Engineers); (United States) Vol. 6:4; ISSN 0885-923X; ISSN SFEVE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ANALYTICAL SOLUTION
FRACTURED RESERVOIRS
GEOLOGIC DEPOSITS
GEOLOGIC SURVEYS
MINERAL RESOURCES
NATURAL OCCURRENCE
OIL FIELDS
OIL WELLS
PERFORMANCE TESTING
PETROLEUM DEPOSITS
POROSITY
PRESSURE GRADIENTS
RESERVOIR PRESSURE
RESOURCES
SURVEYS
TESTING
WELLS