Table 4.5  Crude Oil and Natural Gas Exploratory and Development Wells, 1949-2010




Year
Wells Drilled
Successful
Wells
Footage Drilled 1 Average Footage Drilled
Crude Oil 2 Natural Gas 3 Dry Holes 4 Total Crude Oil 2 Natural Gas 3 Dry Holes 4 Total Crude Oil 2 Natural Gas 3 Dry Holes 4 Total
Number Percent Thousand Feet Feet per Well
1949
21,352   3,363   12,597   37,312   66.2   79,428   12,437   43,754   135,619   3,720   3,698   3,473   3,635  
1950
23,812   3,439   14,799   42,050   64.8   92,695   13,685   50,977   157,358   3,893   3,979   3,445   3,742  
1951
23,179   3,438   17,026   43,643   61.0   95,106   13,947   63,093   172,146   4,103   4,056   3,706   3,944  
1952
23,290   3,514   17,759   44,563   60.1   98,148   15,257   70,730   184,133   4,214   4,342   3,983   4,132  
1953
25,323   3,968   18,449   47,740   61.4   102,136   18,248   73,862   194,245   4,033   4,599   4,004   4,069  
1954
28,141   4,038   18,930   51,109   63.0   113,362   18,857   75,790   208,009   4,028   4,670   4,004   4,070  
1955
30,432   4,266   20,452   55,150   62.9   121,148   19,930   85,103   226,182   3,981   4,672   4,161   4,101  
1956
30,528   4,531   22,111   57,170   61.3   120,352   22,738   90,190   233,280   3,942   5,018   4,079   4,080  
1957
27,364   4,475   20,156   51,995   61.2   110,043   23,836   83,167   217,045   4,021   5,326   4,126   4,174  
1958
23,774   5,005   18,162   46,941   61.3   93,105   25,555   74,643   193,304   3,916   5,106   4,110   4,118  
1959
24,043   4,931   18,589   47,563   60.9   94,611   26,606   79,476   200,694   3,935   5,396   4,275   4,220  
1960
22,258   5,149   18,212   45,619   60.1   86,568   28,246   77,361   192,176   3,889   5,486   4,248   4,213  
1961
21,437   5,486   17,331   44,254   60.8   85,626   29,292   74,716   189,633   3,994   5,339   4,311   4,285  
1962
21,727   5,353   17,078   44,158   61.3   88,431   28,949   77,253   194,634   4,070   5,408   4,524   4,408  
1963
20,135   4,570   16,762   41,467   59.6   81,809   24,533   76,307   182,649   4,063   5,368   4,552   4,405  
1964
19,905   4,694   17,694   42,293   58.2   80,463   25,598   81,360   187,420   4,042   5,453   4,598   4,431  
1965
18,065   4,482   16,226   38,773   58.2   73,322   24,931   76,629   174,882   4,059   5,562   4,723   4,510  
1966
16,780   4,377   15,227   36,384   58.1   67,340   25,948   69,636   162,924   4,013   5,928   4,573   4,478  
1967
15,329   3,659   13,246   32,234   58.9   58,634   21,581   61,142   141,357   3,825   5,898   4,616   4,385  
1968
14,331   3,456   12,812   30,599   58.1   59,517   20,716   64,737   144,970   4,153   5,994   5,053   4,738  
1969
14,368   4,083   13,736   32,187   57.3   61,582   24,162   71,364   157,108   4,286   5,918   5,195   4,881  
1970
12,968   4,011   11,031   28,010   60.6   56,859   23,623   58,074   138,556   4,385   5,860   5,265   4,943  
1971
11,853   3,971   10,309   26,133   60.6   49,109   23,460   54,685   127,253   4,126   5,890   5,305   4,858  
1972
11,378   5,440   10,891   27,709   60.7   49,269   30,006   58,556   137,831   4,330   5,516   5,377   4,974  
1973
10,167   6,933   10,320   27,420   62.4   44,416   38,045   55,761   138,223   4,369   5,488   5,403   5,041  
1974
13,647   7,138   12,116   32,901   63.2   52,025   38,449   62,899   153,374   3,812   5,387   5,191   4,662  
1975
16,948   8,127   13,646   38,721   64.8   66,819   44,454   69,220   180,494   3,943   5,470   5,073   4,661  
1976
17,688   9,409   13,758   40,855   66.3   68,892   49,113   68,977   186,982   3,895   5,220   5,014   4,577  
1977
18,745   12,122   14,985   45,852   67.3   75,451   63,686   76,728   215,866   4,025   5,254   5,120   4,708  
1978
19,181   14,413   16,551   50,145   67.0   77,041   75,841   85,788   238,669   4,017   5,262   5,183   4,760  
1979
20,851   15,254   16,099   52,204   69.2   82,688   80,468   81,642   244,798   3,966   5,275   5,071   4,689  
1980
32,959   17,461   20,785   71,205   70.8   125,262   92,106   99,575   316,943   3,801   5,275   4,791   4,451  
1981
43,887   20,250   27,953   92,090   69.6   172,167   108,353   134,934   415,454   3,923   5,351   4,827   4,511  
1982
39,459   19,076   26,379   84,914   68.9   149,674   107,149   123,746   380,569   3,793   5,617   4,691   4,482  
1983
37,366   14,684   24,355   76,405   68.1   136,849   78,108   105,222   320,179   3,662   5,319   4,320   4,191  
1984
42,906   17,338   25,884   86,128   69.9   162,653   91,480   119,860   373,993   3,791   5,276   4,631   4,342  
1985
35,261   14,324   21,211   70,796   70.0   137,728   76,293   100,388   314,409   3,906   5,326   4,733   4,441  
1986
19,213   8,599   12,799   40,611   68.5   76,825   45,039   60,961   182,825   3,999   5,238   4,763   4,502  
1987
16,210   8,096   11,167   35,473   68.5   66,358   42,584   53,588   162,530   4,094   5,260   4,799   4,582  
1988
13,646   8,578   10,119   32,343   68.7   58,639   45,363   52,517   156,519   4,297   5,288   5,190   4,839  
1989
10,230   9,522   8,236   27,988   70.6   43,266   49,081   42,099   134,446   4,229   5,154   5,112   4,804  
1990
12,839   11,246   8,245   32,330   74.5   56,591 [R] 57,028 [R] 42,433 [R] 156,052 [R] 4,408 [R] 5,071 [R] 5,147 [R] 4,827 [R]
1991
12,588   9,793   7,481   29,862   74.9   56,196 [R] 51,032 [R] 37,750 [R] 144,978 [R] 4,464 [R] 5,211 [R] 5,046 [R] 4,855 [R]
1992
9,402   8,163   5,862   23,427   75.0   45,748 [R] 44,727 [R] 29,451 [R] 119,926 [R] 4,866 [R] 5,479 [R] 5,024 [R] 5,119 [R]
1993
8,856   9,839   6,096   24,791   75.4   44,236 [R] 58,240 [R] 31,018 [R] 133,494 [R] 4,995 [R] 5,919 [R] 5,088 [R] 5,385 [R]
1994
7,348   9,375   5,096   21,819   76.6   38,620 [R] 58,340 [R] 27,771 [R] 124,731 [R] 5,256 [R] 6,223 [R] 5,450 [R] 5,717 [R]
1995
8,248   8,082   4,814   21,144   77.2   41,076 [R] 49,746 [R] 26,349 [R] 117,171 [R] 4,980 [R] 6,155 [R] 5,473 [R] 5,542 [R]
1996
8,836   9,027   4,890   22,753   78.5   42,472 [R] 56,042 [R] 27,851 [R] 126,365 [R] 4,807 [R] 6,208 [R] 5,696 [R] 5,554 [R]
1997
11,206   11,498   5,874   28,578   79.4   56,371 [R] 71,270 [R] 33,640 [R] 161,281 [R] 5,030 [R] 6,198 [R] 5,727 [R] 5,644 [R]
1998
7,682   11,639   4,761   24,082   80.2   38,579 [R] 70,099 [R] 28,540 [R] 137,218 [R] 5,022 [R] 6,023 [R] 5,995 [R] 5,698 [R]
1999
4,805   12,027   3,550   20,382   82.6   22,024 [R] 60,217 [R] 20,608 [R] 102,849 [R] 4,584   5,007 [R] 5,805 [R] 5,046 [R]
2000
8,090   17,051   4,146   29,287   85.8   36,745 [R] 83,618 [R] 24,076 [R] 144,439 [R] 4,542 [R] 4,904 [R] 5,807 [R] 4,932 [R]
2001
8,888   22,072   4,598   35,558   87.1   43,172 [R] 110,734 [R] 26,221 [R] 180,127 [R] 4,857 [R] 5,017 [R] 5,703 [R] 5,066 [R]
2002
6,775   17,342   3,754   27,871   86.5   30,892 [R] 93,041 [R] 21,232 [R] 145,165 [R] 4,560 [R] 5,365 [R] 5,656 [R] 5,208 [R]
2003
8,129   20,722   3,982   32,833   87.9   38,588 [R] 115,916 [R] 22,744 [R] 177,248 [R] 4,747 [R] 5,594 [R] 5,712 [R] 5,398 [R]
2004
8,789   24,186   4,082   37,057   89.0   42,109 [R] 138,449 [R] 23,714 [R] 204,272 [R] 4,791 [R] 5,724 [R] 5,809 [R] 5,512 [R]
2005
10,779   28,590 [R] 4,653   44,022 [R] 89.4   51,449 [R] 163,820 [R] 25,044 [R] 240,313 [R] 4,773 [R] 5,730 [R] 5,382 [R] 5,459 [R]
2006
13,404 [R] 32,838 [R] 5,206 [R] 51,448 [R] 89.9   63,340 [R] 191,646 [R] 27,778 [R] 282,764 [R] 4,725 [R] 5,836 [R] 5,336 [R] 5,496 [R]
2007
13,361 [R] 32,719 [R] 4,978 [R] 51,058 [R] 90.3   64,792 [R] 208,907 [R] 27,754 [R] 301,453 [R] 4,849 [R] 6,385 [R] 5,575 [R] 5,904 [R]
2008
16,645 [R] 32,274 [R] 5,428 [R] 54,347 [R] 90.0 [R] 82,646 [R] 223,224 [R] 28,572 [R] 334,442 [R] 4,965 [R] 6,917 [R] 5,264 [R] 6,154 [R]
2009
11,261 [R] 18,234 [R] 3,552 [R] 33,047 [R] 89.3 [R] 62,771 [R] 156,200 [R] 20,520 [R] 239,491 [R] 5,574 [R] 8,566 [R] 5,777 [R] 7,247 [R]
2010
16,254 [R] 16,973 [R] 4,277 [R] 37,504 [R] 88.6 [R] 100,682 [R] 146,973 [R] 21,719 [R] 269,374 [R] 6,194 [R] 8,659 [R] 5,078 [R] 7,183 [R]
1See "Footage Drilled" in Glossary. R=Revised.  
2See "Crude Oil Well" in Glossary. Notes:  ·  2011 data for this table were not available in time for publication.  ·  Data are estimates.
·  Data are for exploratory and development wells combined; see Table 4.6 for exploratory wells only, and
Table 4.7 for development wells only.  ·  Service wells, stratigraphic tests, and core tests are excluded.
·  For 1949–1959, data represent wells completed in a given year.  For 1960–1969, data are for well
completion reports received by the American Petroleum Institute during the reporting year.  For 1970
forward, the data represent wells completed in a given year.  The as-received well completion data for
recent years are incomplete due to delays in the reporting of wells drilled.  The U.S. Energy Information
Administration (EIA) therefore statistically imputes the missing data.  ·  Totals may not equal sum of
components due to independent rounding.  Average depth may not equal average of components due to
independent rounding.
3See "Natural Gas Well" in Glossary. Web Pages:  ·  See http://www.eia.gov/totalenergy/data/monthly/#crude for updated monthly and annual
data.  ·  See http://www.eia.gov/petroleum/ for related information.
4See "Dry Hole" in Glossary. Sources: ·  1949-1965—Gulf Publishing Company, World Oil, "Forecast-Review" issue.
·  1966-1969—American Petroleum Institute (API), Quarterly Review of Drilling Statistics for the United
States, annual summaries and monthly reports.  ·  1970-1989—EIA computations based on well reports
submitted to the API.  ·  1990 forward—EIA computations based on well reports submitted to IHS, Inc.,
Denver, CO.