Abstract

The Spraberry Trend Area in West Texas encompasses a productive area greater than 2,500 mi2. Spraberry was once deemed, "The largest uneconomic field in the world." The marginal economics and low recoveries of producing in Spraberry are well documented and have effectively prevented comprehensive reservoir characterization yet the Spraberry Trend Area continues to produce nearly 60 Mbopd from more than 7,500 wells and has produced 700 MMbbls during the life of the reservoir. Many wells have been abandoned due to low productivity and many more face the same fate unless new technology becomes available which will improve recovery over the current low value. Spraberry Trend Area reservoirs originally contained some 10 Bbbls OOIP of which less than 10% has been recovered. Obviously, the oil remaining in place represents a tremendous EOR target.

Many of the large Spraberry Units which were once operated by major oil companies have been acquired by independent oil companies. Development of these units has resulted in extensive in-fill drilling from 1991 through 1995. The consolidation of large tracts of unitized Spraberry production under one operator combined with a plentiful, local and relatively inexpensive supply of CO2 has raised some interesting questions. This paper addresses the necessary background and future plans for a proposed CO2 pilot in the Upper Spraberry.

The work in this paper also demonstrates the value of consolidating old data from several operators aud integrating with more recent data as a necessary step towards comprehensive fracture characterization, a precursor for developing all possible process options before vast numbers of Spraberry wells are plugged and abandoned.

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