--> --> Abstract: Potential for Infill Drilling in a Naturally Fractured Tight Gas Sandstone Reservoir, by H. Harstad, L. W. Teufel, J. C. Lorenz, and W. H. Babcock; #90928 (1999).
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HARSTAD, HUGO1, LAWRENCE W. TEUFEL1, JOHN C. LORENZ2, and WILLIAM H. BABCOCK3
1New Mexico Tech
2Sandia National Laboratories
3Burlington Resources.

Abstract: Potential for Infill Drilling in a Naturally Fractured Tight Gas Sandstone Reservoir

Modeling of the Mesaverde Formation in the San Juan Basin, northwestern New Mexico, shows the importance of using realistic drainage patterns in a naturally fractured reservoir. Fractures not only enhance the overall porosity and permeability of these reservoirs, but fractures also create significant permeability Previous HitanisotropyNext Hit. Permeability Previous HitanisotropyNext Hit causes the drainage area around the wells to be elliptical. Directional permeability is best found with multiple well interference tests. Predicted potential for infill drilling depends on the modeling approach, because elliptical drainage creates more overlap and undrained sections than a more radial drainage in an isotropic permeability case. Modeling with permeability Previous HitanisotropyNext Hit increases the potential for infill drilling and identifies optimum locations for new infill wells.

This approach has been applied in the Mesaverde Formation to determine economic optimization of infill drilling in these reservoirs and demonstrates that field development based on elliptical drainage areas can lead to a reduction in drainage overlap of adjacent wells and prevent leaving undrained areas. From multiple well interference testing a strong permeability Previous HitanisotropyTop was found. Reservoir simulations were performed in two pilot areas of different fracture intensity to quantify the potential for infill drilling, reducing the well spacing from 320 to 160 acre. Simulation results indicate areas of effective drainage, the optimum locations for infill wells, and the additional recovery from infill wells.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas