Transient pressure analysis of horizontal wells in anisotropic naturally fractured reservoirs
Analytical solutions are presented for pressure-drawdown and -buildup analyses of horizontal wells in anisotropic reservoirs with tectonic, regional, or contractional natural fractures. (The reservoirs might be limited by parallel sealed boundaries.) These solutions have led to the identification of various flow periods, including radial in a vertical plane, transitional as a result of flow from the matrix into the fractures, linear when the transient pressure reaches the upper and lower boundaries of the reservoir, pseudoradial toward the wellbore in horizontal plane, and linear when the transient reaches the outer parallel boundaries. Recognition of these flow periods leads to the calculation of p{sub i} or P*; permeabilities in the x, y, and z directions; storativity ratio, {omega}; average distance between natural fractures; fracture porosity; and fracture aperture, skin, and pseudoskin caused by vertical and horizontal partial penetration. In this paper calculations are illustrated with an example.
- OSTI ID:
- 5681733
- Journal Information:
- SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Vol. 6:1; ISSN 0885-923X
- Country of Publication:
- United States
- Language:
- English
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99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
42 ENGINEERING
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FLUID MECHANICS
OIL WELLS
DIRECTIONAL DRILLING
RESERVOIR ROCK
PERMEABILITY
PRESSURE GRADIENTS
ANALYTICAL SOLUTION
CALCULATION METHODS
ENHANCED RECOVERY
FORMATION DAMAGE
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TRANSIENTS
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020300 - Petroleum- Drilling & Production
990200 - Mathematics & Computers
420400 - Engineering- Heat Transfer & Fluid Flow