Geological, Petrophysical and Engineering Analysis of the Davis Sandstone. DallasProduction Inc., Sallie Hill A No. 1, Parker County, Texas. Topical Report, January 1992

摘要

GRI has initiated a program to determine reservoir characteristics and horizontalwell designs in areas where such horizontal well completions in gas formations can reduce unit production costs in comparison to vertical well completion methods. Data were collected and analyzed on vertical co-op well in the Davis Sandstone, the Dallas Production Sallie Hill A No. 1, in support of the goal. Similar to the previous GRI vertical co-op wells, the objective of the data acquisition program was to determine in situ stress directions in the Davis Sandstone so that Dallas Production could use the information to design a horizontal well. The techniques used to evaluate the stress directions included: overcoring and orientation of an open-hole stress test fracture; determination of the overall height and azimuth of the stress test fracture with a borehole image log; and anelastic strain recovery (or core strain relaxation) analyses on Davis core. The results of these evaluations indicated that maximum horizontal stress ranges between N10 deg E and N30 deg E. Stress profiling and log evaluations were also performed with the data collected. These evaluations indicated that the net sandstone thickness in the Davis was only 9.5 ft. The zone was not fracture treated and was subsequently abandoned.