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Well kill
A well kill is the set of actions taken to kill a well and prevent a blowout, by circulating out the kick and replacing mud with kill-weight mud.
Well test (oil and gas)
A well test is a petroleum engineering procedure in which a well's flow rate and pressure are temporarily controlled and measured to evaluate reservoir properties, from exploration through field surveillance.
Well test analysis
Well test analysis, also called pressure transient analysis (PTA), interprets pressure and flow-rate measurements at a well to estimate reservoir properties such as permeability, skin factor, and pressure.
Wellbore stability analysis
Wellbore stability analysis is a geomechanical method predicting whether a drilled borehole stays intact, computing the safe mud weight window between collapse and lost circulation.
West Kingfish Oil and Gas Field
West Kingfish is an oil field in the Gippsland Basin off Victoria, Australia, developed from a platform by Esso and BHP between 1982 and 1984, now decommissioned.
West Tuna Oil and Gas Field
West Tuna is an oil and gas field in the Gippsland Basin of Bass Strait, off Victoria, Australia, now producing natural gas from the West Tuna platform.
West White Rose
West White Rose is an offshore oil development in the White Rose field on the Grand Banks off Newfoundland and Labrador, operated by Cenovus Energy.
Western Canada Select
Western Canada Select (WCS) is a heavy, sour crude oil blend produced in western Canada and the benchmark price for Canadian heavy crude, created in 2004 at Hardisty, Alberta.
Western Canadian Select
Western Canadian Select (WCS) is a blended heavy sour crude oil stream created in 2004 that serves as the benchmark price for Canadian heavy oil, priced at Hardisty, Alberta.
Weyburn Midale Oil Pool
The Weyburn Midale Oil Pool is a pair of large adjacent oil fields in southeastern Saskatchewan, Canada, discovered in 1953 and 1954 in Mississippian carbonate rocks.
White mineral oil
White mineral oil (liquid paraffin, food grade mineral oil, CAS 8012-95-1) is a highly refined, colorless mixture of saturated petroleum hydrocarbons used as a food additive, release agent, and pharmaceutical base, with viscosity-based grades and ADIs of 0.01–20 mg/kg bw per day.
White Rose Field
White Rose Field is an offshore oil field in the Jeanne d'Arc Basin on the Grand Banks of Newfoundland, discovered in 1984, with first oil in November 2005.
Wildmere Oil and Gas Field
Wildmere is a designated heavy crude oil field in east central Alberta, about 200 kilometers southeast of Edmonton, known for waterflooding and an early electromagnetic heating trial.
Wilmington Oil Field
The Wilmington Oil Field is a giant oil field beneath Long Beach and San Pedro Bay, California, discovered in 1932 and the third-largest in the United States by cumulative production.
Wood River Refinery
The Wood River Refinery is a petroleum refinery in Roxana, Illinois, near St. Louis, that has processed crude oil since 1918 and today is one of Phillips 66's refineries.
Woods Cross refinery
The Woods Cross refinery is a petroleum refinery in Woods Cross, Utah, near Salt Lake City, owned by HF Sinclair with a capacity of 45,000 barrels per day.
Workover
A workover is a maintenance operation on a completed oil or gas well to restore or increase production, typically requiring the well to be killed.
Wuqi Oil Field
Wuqi Oil Field (吴起油田) is an onshore conventional oil field in Wuqi County, Shaanxi, China, discovered in 1993 and operated by Yanchang Oilfield in the Ordos Basin.
Wytch Farm Oil and Gas Field
Wytch Farm is an onshore oil field on the Isle of Purbeck in Dorset, England, and the largest onshore oil field in the UK and western Europe.
Xanab Oil and Gas Field
Xanab (Campo Xanab) is an offshore oil and gas field in shallow Gulf of Mexico waters, operated by Pemex and counted among its main producers.
Xifeng Oil Field
The Xifeng Oil Field (西峰油田) is a large onshore oil field in southwest China's Ordos Basin, discovered in 2001 and operated by PetroChina's Changqing Oilfield Branch.
Xijiang 23-1 Oil Field
Xijiang 23-1 is an operating offshore oil field in the South China Sea, China, in the Pearl River Mouth Basin, operated by CNOOC since 2008.
Xijiang 24-3 Oil Field
Xijiang 24-3 (西江24-3) is an offshore oil field in the Pearl River Mouth Basin, South China Sea, discovered by Phillips Petroleum in 1985 and producing since 1994.
Xin'anbian Tight Oil Field
The Xin'anbian Tight Oil Field (新安边油田) in the Ordos Basin of Shaanxi, China, proved in 2014, was China's first large continental tight oil field, with reserves over 100 million tons.
Xingshugang Oil Field
Xingshugang Oil Field (杏树岗油田) is one of the three largest fields of the Daqing oil complex in the Songliao Basin, Heilongjiang, China, developed from 1963 and a leading site of polymer and ASP flooding.
Xux Oil and Gas Field
Xux is an oil and gas field in shallow Gulf of Mexico waters about 10 kilometers off Tabasco, Mexico, discovered in 2009 and producing since 2014.
Yadavaran Oil Field
Yadavaran Oil Field (میدان نفتی یادآوران) is a large onshore oil field in Khuzestan, southwestern Iran, about 70 km southwest of Ahvaz near the Iraqi border.
Yanbu Refinery
Yanbu Refinery is a Saudi Aramco-owned oil refinery on the Red Sea coast at Yanbu, Saudi Arabia, commissioned in 1983 with a capacity of about 230,000 barrels per day.
Yaraktinskoye Oil Field
Yaraktinskoye is an onshore oil, gas, and condensate field in Irkutsk Oblast, Russia, about 140 km from Ust-Kut. Discovered in 1971, it is operated by the Irkutsk Oil Company.
Yaran North Oil Field
Yaran North Oil Field is an operating oil field in Khuzestan, Iran, forming the northern part of the Yaran field shared with Iraq, where it is called Majnoon.