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 a "stripper" ''gas well'' is defined by the

Interstate Oil and Gas Compact Commission The Interstate Oil and Gas Compact Commission (IOGCC),< formerly the Interstate Oil Compact Commission, is a

as one that produces or less of gas per day at its maximum flow rate; the

Internal Revenue Service The Internal Revenue Service (IRS) is the revenue service for the Federal government of the United States, United States federal government, which is responsible for collecting Taxation in the United States, U.S. federal taxes and administerin ...

, for tax purposes, uses a threshold of per day. ''Oil wells'' are generally classified as stripper wells when they produce 10-15 barrels per day or less for any twelve-month period.

Economic importance

In the United States in 2015, 11 percent of

crude oil Petroleum, also known as crude oil or simply oil, is a naturally occurring, yellowish-black liquid chemical mixture found in geological formations, consisting mainly of hydrocarbons. The term ''petroleum'' refers both to naturally occurring u ...

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 Appalachia ( ) is a geographic region located in the Appalachian Mountains#Regions, central and southern sections of the Appalachian Mountains in the east of North America. In the north, its boundaries stretch from the western Catskill Mountai ...

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

and

Oklahoma Oklahoma ( ; Choctaw language, Choctaw: , ) is a landlocked U.S. state, state in the South Central United States, South Central region of the United States. It borders Texas to the south and west, Kansas to the north, Missouri to the northea ...

. A stripper well may cost between $10 and $30 per barrel to operate, averaging $2,000 per month.

Taxation

In Oklahoma, the regular tax rate is 7 percent, but may be 1 percent for marginal wells. In Michigan, stripper well tax is 4 percent. Other tax exemptions can be 15 percent of gross income. A 2005 tax credit for prices below $30/barrel was rarely in effect.

Premature abandonment

Many of these wells are marginally economic and at risk of being prematurely abandoned. When world

oil prices The price of oil, or the oil price, generally refers to the spot price of a barrel () of benchmark crude oil—a reference price for buyers and sellers of crude oil such as West Texas Intermediate (WTI), Brent Crude, Dubai Crude, OPE ...

were in the low tens in the late 1990s, the oil that flowed from marginal wells often cost more to produce than the price it brought on the market. From 1994 to 2006, approximately 177,000 marginal wells were plugged and abandoned, representing a number equal to 42 percent of all operating wells in 2006, costing the U.S. more than $3.8 billion in lost oil revenue at the EIA 2004 average world oil price. When marginal wells are prematurely abandoned, significant quantities of oil remain behind. In most instances, the remaining reserves are not easily accessible when oil prices subsequently rise again: when marginal fields are abandoned, the surface infrastructure – the pumps, piping, storage vessels, and other processing equipment – is removed and the lease forfeited. Since much of this equipment was probably installed over many years, replacing it over a short period should oil prices jump upward is cost prohibitive. Oil prices would have to rise beyond their historic highs and remain at elevated levels for many years before there would be sufficient economic justification to bring many marginal fields back into production.

References

{{Reflist

Sources

The Stripper Well Consortium

DOE - Fossil Energy: DOE's Marginal/Stripper Well Revitalization Programs

* ttps://web.archive.org/web/20100226181610/http://data-linc.com/industries/oilandgas/stripperwells/index.htm Data-Linc Group: Oil and Gas/Decreasing Foreign Oil Dependency/by Milking Marginal Oil Wells

External links

National Stripper Well Association
Petroleum production Oilfield terminology Petroleum economics