Abstract

The Walnut Bend Field is located near Gainesville, Texas just south of the Red River. The field was discovered in 1938 and has had over 700 wellbores drilled. The field consists of over 70 Pennsylvanian zones, mostly channel sands, which are on an elongated, anticlinal structure approximately 3 miles long and 1.5 miles wide. The main body of the field has produced over 99 MMBO and was making less than 600 BOPD when a new recompletion program was initiated. The recompletion program was based on the output of a new volumetric-balancing tool which recreated the underground movement of hydrocarbons and water in each reservoir from first production through present day. One reservoir is focused on for this presentation. Since then, more than 100 wells have been recompleted, and a few new wells were drilled. Current production is nearly 800 BOPD and prediction accuracy has been higher than 75%. Required input included a new set of geologic maps and the production & injection history. The conspicuous absence of pressure and the field production in 1999 did not justify the time and expense of conventional reservoir simulation, even if there had been enough input data.