Density of Oil-gas Columns from Well Data

Actual field data from several wells are used to illustrate the applicationof the method of determining the average density of the fluid column in aflowing oil well in the Yates field, Pecos County, Texas. The depths of the wells in the Yates field vary from 900 to 1700 ft., dependingon surface elevation and the location of the wells on structure. Productionrates over 8000 bbl. per hour have been determined and many wells are capableof producing 2000 bbl. hourly. Gas-oil ratios are usually below 400 cu. ft. perbarrel, but a few wells high on structure have produced over 3000 cu. ft. perbarrel. Incidentally, tubing wells has cut these high ratios to as low as 400cu. ft. 1 By common agreement of the operators all wells making ratios over 400cu. ft. will be tubed. Daily production of the field is prorated to 110,000bbl. from an open-flow potential of 5,000,000 bbl. based on hourly open-flowgages.