The economics of petroleum . e deliveringcapacity of the gas-well and thus results in a declining rate of the rock-pressure falls below the point at which the gaswill flow into the receiving lines and either the well must be aban-doned or a compressor must be installed for increasing the pressureof the gas. The trend of the average rock-pressure of a pool or afield gives a basis for estimating the future life of the deposit. Theaverage dechne in rock-pressure, based on the performance of some2500 wells in nearly all of the productive districts of Pennsylvaniaand New York, is
The economics of petroleum . e deliveringcapacity of the gas-well and thus results in a declining rate of the rock-pressure falls below the point at which the gaswill flow into the receiving lines and either the well must be aban-doned or a compressor must be installed for increasing the pressureof the gas. The trend of the average rock-pressure of a pool or afield gives a basis for estimating the future life of the deposit. Theaverage dechne in rock-pressure, based on the performance of some2500 wells in nearly all of the productive districts of Pennsylvaniaand New York, is siiown in Fig. 04 for the period 190()-1919, with aprojection ahead.^ It appeals fi-om this cluul that from 1906 to Data from W. Irwin Moyor, The Natural-gas Fields of ICastorn UnitedStates and Their Probable Future Life, Nat. Gas Assoc. America, May, 1920. 200 NATURAL GAS AND NATURAL-GAS GASOLINE 1919 the average rock-pressure in West Virginia declined about70 per cent and in Pennsylvania, about 65 per cent; and that at its. ^\ / BRAXTON ^ X ^1 LEGEND ^^ OaS Fi£U3 Fig. 93.—Map of natural gas property of the Philadelphia Company in Penn-sylvania and West Virginia as of Jan. 1, 1920; after S. S. Wyer. past rate of decline the pressure will reach 20 pounds in 1942 forWest Virginia and 20 pounds in 1948 for Pennsylvania. Transmission of Natural Gas.—The transportation of natural gasis an important step linking production with utilization. As with > •A
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