Successful Glorieta-San Angelo waterflood, Snyder Field, Howard County, Texas

The Snyder field is located in SE. Howard County, Texas, and covers approx. 6,000 productive acres. Production is obtained from approx. 400 wells. The portion of the Snyder field reviewed includes 12 leases with 65 producing wells and 30 newly drilled water-injection wells on these properties. The following subjects are discussed: geology of the field, the primary development of the field, primary production, waterflood history, pilot waterflood development, cooperative planning, drilling and completion of injection wells, water supply, water injection facilities, production equipment, and waterflood performance. After 6 yr of waterflood performance, some of the conclusions which can be made include the following: (1) the Glorieta-San Angelo reservoir, as described, can be successfully waterflooded utilizing newly drilled and completed water-injection wells; and (2) high water- injection rates can be used and injection water quality does not seem to affect injection rates and pressures. Analyses of active waterfloods indicate the optimum injection well density is one new injector per 80 acres.