Comparison of pressure ransient response in intensely and sparsely fractured reservoirs

Technical Report · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/5248382· OSTI ID:5248382

Johns, R T

A comprehensive analytical model is presented to study the pressure transient behavior of a naturally fractured reservoir with a continuous matrix block size distribution. Geologically realistic probability density functions of matrix block size are used to represent reservoirs of varying fracture intensity and uniformity. Transient interporosity flow is assumed and interporosity skin is incorporated. Drawdown and interference pressure transient tests are investigated. The results show distinctions in the pressure response from intensely and sparsely fractured reservoirs in the absence of interporosity skin. Also, uniformly and nonuniformly fractured reservoirs exhibit distinct responses, irrespective of the degree of fracture intensity. The pressure response in a nonuniformly fractured reservoir with large block size variability, approaches a nonfractured (homogeneous) reservoir response. Type curves are developed to estimate matrix block size variability and the degree of fracture intensity from drawdown and interference well tests.

• Research Organization: Stanford Univ., CA (United States). Stanford Geothermal Program
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AS07-84ID12529
• OSTI ID: 5248382
• Report Number(s): SGP-TR-124; ON: DE92016030
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150200* -- Geology & Hydrology of Geothermal Systems
152000 -- Geothermal Data & Theory
58 GEOSCIENCES
580000 -- Geosciences
FRACTURED RESERVOIRS
FUNCTIONS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
Geothermal Legacy
MATHEMATICAL MODELS
POROSITY
PROBABILISTIC ESTIMATION
RESPONSE FUNCTIONS
WELLHEADS
WELLS