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Abstract
Abstract This paper presents the results of a complete reservoir study designed todetermine a sound economic program for the conservation of oil and gas in thePickton field, Hopkins County, Texas. The Pickton field produces from the BaconLime with all indications of the study being that production is predominatelyby dissolved-gas drive. Calculations of the total ultimate recovery to beexpected under primary operations indicated only 16.7 per cent of the oiloriginally in place would be recovered. This unusually low recovery is due tothe type of drive operating and the extremely high dissolved gas-oil ratio andshrinkage. Results are presented for six plans of returning gas to the reservoir, evaluated to determinecomparative recoveries and economics ofreturning gas at a constant rate by supplementing Pickton gas with extraneousgas during the early portion of the operation, andconventional gas-returnoperations without using extraneous gas, andthe optimum size of compressorplant for each type of pressure maintenance. The over-all economic program considers, for either type pressuremaintenance operation, a gasoline plant to process the unusually richcasinghead gas. Since pressure maintenance will disturb equities, pooling ofroyalties is in the case of Pickton a prerequisite to conservation of oil bythis type of operation, both from an economic and legal standpoint. In theevent pooling of royalties cannot be achieved, the study considers a gasolineplant to operate under a modified primary production operation which will makethe conservation of gas possible. Introduction The Pickton field, located in Hopkins County, Texas, was discovered inNovember, 1944, by the completion of Humble's C. D. Nichols 1, in the Baconlime of the Lower Glen Rose formation, through perforations from 7,888 to 7,896feet. The well initially produced 50.2 API gravity oil with a gasoil ratio of1,350 cubic feet per barrel. Subsurface samples of the reservoir fluid obtainedsoon after completion of the discovery well showed that the Pickton crude isunique in that it has an extremely high dissolved gas-oil ratio and is subjectto very severe shrinkage. T.P. 2564
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