This paper presents a case history of the hydraulic fracturing stimulations applied to the Antelope Shale (AS) zone in the Southeast Lost Hills (SELH) Field located in Lost Hills, CA. Over 100 wells have been stimulated in this low permeability naturally fractured reservoir since 1979. The hydraulic fracture treatments have been refined to their current empirically "optimized" design.

Results are presented concerning production response vs. sand volume placed and the effect of various proppant sizes on production and job success. In addition, results are given from the use of inter-stage pressure bombs hung below bridge plugs for determination of inter-zonal communication during treatments. Also, the paper discusses the developed perforating schemes and their effect on zone coverage, and the identification of reservoir depletion in various infill wells exemplified by lower fracture gradients.

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