During late 1950 and up to present date in 1951 the Spraberry sand production of West Texas has created wide-spread interest in the oil producing industry. It is recognized that there are many controversial opinions concerning operations in the Spraberry, it's economic value, and future development. The application of Hydrafrac procedures to completion of Spraberry wells has become prominent in the development of these sands. This paper outlines the geologic and historical development of the Spraberry and the use of Hydrafrac applications in these formations. Introduction The application of the Hydrafrac Process to wells completing from the Spraberry formation was begun during the last part of 1950. The Hydrafrac Process consists of preparing a viscous gel to which a special sand is added and pumping this material into the producing formation at a rate which will develop sufficient hydraulic force to produce and/or extend a fracture. The gel must be of an unstable character to revert to a thin fluid, such that it may be recovered from the well, leaving the introduced sand in the fracture as a propping agent. In order to insure the reversion of gel to a fluid, breaker chemicals are mixed with crude oil and flushed into the formation behind the gel. The success of these treatments has been closely associated nth the current expanding drilling and development program along an area commonly referred to as the Spraberry Trend. 'Top of Spraberry' is found at depths of 6,500 to 7,500 feet in most of this area. This trend covers an area over 100 miles in length and 50 miles in width from the North Gail Field of Borden County to the Flatrock Field of Upton County. Location of this eight county area of West Texas is shown in Figure 1.Location of the fields discovered through June 1951 are shown in Figure 2.

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