The economics of petroleum . West, ^irginia. . Wyo. and Mont. .Total 169 179 181 189 197 203 259 * December 31. t October 31. Table 17.—Wells Completed in the United States by Fields, 1913-1920(Data compiled chiefly from Oil and Gas Journal) 1913 1914 1915 191G 1917 1918 1919 1920 7,905 5,909 4,085 6,234 5,435 4,413 5,192 5,682 Lima-Ind. 1,605 452 966 800 693 824 1,057 768 952 469 582 605 940 1,242 Illinois. . 1,583 756 1,459 647 397 370 385 179 104 1,091 1,651 2,190 3,734 2,888 Kansas. . 2,
The economics of petroleum . West, ^irginia. . Wyo. and Mont. .Total 169 179 181 189 197 203 259 * December 31. t October 31. Table 17.—Wells Completed in the United States by Fields, 1913-1920(Data compiled chiefly from Oil and Gas Journal) 1913 1914 1915 191G 1917 1918 1919 1920 7,905 5,909 4,085 6,234 5,435 4,413 5,192 5,682 Lima-Ind. 1,605 452 966 800 693 824 1,057 768 952 469 582 605 940 1,242 Illinois. . 1,583 756 1,459 647 397 370 385 179 104 1,091 1,651 2,190 3,734 2,888 Kansas. . 2,174 2,362 3,637 3,469 4,671 3,442 3,163 Oklahoma 9,131 8,297 4,603 7,730 6,717 8,374 8,196 9,187 761 755 295 576 1,020 1,225 3,564 6,479 N. 541 448 476 546 472 533 724 1,163 Gulf 731 564 859 1,113 1,562 1,677 1,238 1,760 Wyoming. 74 134 277 248 286 348 U. S. 575 421 240 645 736 589 559 587 25,582 22,891 13,984 24,620 23,091 25,615 29,069 34,021 NEW WELLS COMPLETED 39 50,000. 100 1914 1915 1916 1917 1918 1919 1920 1921 Fig. 13.—Wells completed annually in the United States by fields, from Oil and Gas Journal. 40 THE TREND OF OIL-FIELD DEVELOPMENT while the data are plotted on a ratio chart ^ in Fig. 13 in order to in-terpret the trend of this development work. The notable decline indrilling that characterized 1915 in response to the 1914-1915 periodof overproduction in the Mid-Continent field is suggestive of theprobable course of drilling in 1921, following the 1920 period of over-production. The marked increase in drilling activity in northernTexas and northern Louisiana during 1919-1920 in particular formsa conspicuous feature of the chart. Not all wells drilled strike oil, and the numerical relation betweennew oil-wells and dry holes over a period of years is shown in Table 18and Fig. 14 for the great Mid-Continent field. In this region, about a 100-90-80-70-60- so- 40-30-20-10-0- FlG KANSAS OKLAHOMA
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