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The history of the Old Luling (Edwards Limestone) field, Caldwell and Guadalupe counties, Tex., is briefly reviewed from the date of discovery through the year 1946. In the year 1946, the field was in an advanced state of depletion. The operator of a majority of the field undertook an intensive work over, drilling-deeper, new well, and modernization program extending through the year 1955. This program, which involved the use of diamond coring, radioactive and electric logs, the application of cementing techniques new to the Luling field, correlation of underground zones of porosity in the Edwards Limestone, and the disposition of large volumes of salt water, is reviewed in detail. Oil productions which had reached a low of 1.5 million bbl/year in 1946, was increased to 2.5 million bbl/year by the end of 1955, and during the year 1956 showed the first decline after the program was started. Replacement of equipment in use for 25 years in a sour crude field is discussed. A better understanding of the geology and the nature of the accumulation and how it is affected by faulting was obtained by the program. In several instances, virgin or undrained reservoirs were developed. Introduction The Old Luling field is located in Caldwell and Guadalupe counties, Tex. It is approximately 5 miles northwest of the city of Luling and 1.1 miles southeast of the town of Prairie Lea, Tex. The specific geographical location is shown in Fig. 1. Some time after the discovery of the Luling field, the name was changed to the Luling-Branyon field.

A Report on the Old Luling (Edwards Limestone) Field, Caldwell and Guadalupe Counties, Texas