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Stripper well
A stripper well or marginal well is an oil or gas well that is nearing the end of its economically useful life. In the United States of America a "stripper" ''gas well'' is defined by the Interstate Oil and Gas Compact Commission as one that produces or less of gas per day at its maximum flow rate; the Internal Revenue Service, for tax purposes, uses a threshold of per day.
''Oil wells'' are generally classified as stripper wells when they produce ten barrels per day or less for any twelve-month period.
==Economical importance==
In the United States of America, one out of every six barrels of crude oil produced comes from a marginal oil well, and over 85 percent of the total number of U.S. oil wells are now classified as such. There are over 420,000 of these wells in the United States, and together they produce nearly of oil per day, 18 percent of U.S. production.
Additionally, as of 2006, there are more than 296,000 natural gas stripper wells in the lower 48 states. Together they account for over of natural gas, or about 9 percent of the natural gas produced in the lower 48 states. Stripper wells are more common in older oil and gas producing regions, most notably in Appalachia, Texas and Oklahoma.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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