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Solvent dewaxing
Solvent dewaxing is a petroleum refining process that removes wax from lubricating oil stocks by solvent dilution, chilling, and filtration, giving the oil low-temperature fluidity and yielding slack wax.
Songfangtun Oil Field
Songfangtun Oil Field (宋芳屯油田) is a stratigraphically trapped oil field in the Songliao basin, Heilongjiang, China, producing from Cretaceous Putaohua sandstones as a peripheral Daqing field.
Sorochinsko-Nikolskoye Oil Field
Sorochinsko-Nikolskoye Oil Field (Сорочинско-Никольское месторождение) is an onshore oil field in Orenburg Oblast, Russia, north of Sorochinsk, operated by Rosneft's Orenburgneft and producing commercially since 1967.
Soroosh Oil Field
The Soroosh Oil Field (Persian: میدان نفتی سروش, formerly named Cyrus) is an offshore oil field about 85 km southwest of Kharg Island in Iran's Bushehr province, holding heavy crude.
Sorovskoye oil field
Sorovskoye oil field (Соровское месторождение) is an onshore oil field in the Salym district of West Siberia, Russia, discovered by Yukos in 2002 and developed by Rosneft companies.
Sour crude
Sour crude is crude oil containing more than 1% sulfur, which gives it a rotten-egg smell and requires special refining compared with low-sulfur sweet crude.
South Arne Oil and Gas Field
South Arne, also known as Syd Arne, is an oil and gas field in the Danish sector of the North Sea, discovered in 1969 and producing since 1999.
South West Melehia Oil Field
South West Melehia (SWM) is an onshore oil and gas field in Egypt's Western Desert, discovered in 2018 and producing since 2019 at about 5,000 barrels per day.
Spindletop
Spindletop, an oil field south of Beaumont, Texas, marked the birth of the modern petroleum industry when the Lucas Gusher blew in on January 10, 1901.
Spraberry Trend
The Spraberry Trend is a giant oil-producing area in the Midland Basin of West Texas, discovered in 1949, holding about 10 billion barrels of oil in place.
Squeeze cementing
Squeeze cementing is a remedial well operation in which cement slurry is pressured into perforations, leaks, and annular channels, dehydrating to form a solid seal.
Squeeze plug (wellbore)
A squeeze plug is a volume of cement forced under pressure into a wellbore's perforations or channels to seal off fluid flow, a remedial technique introduced in the 1930s.
Sredne-Nazymskoye Oil and Gas Field
Sredne-Nazymskoye (Средне-Назымское) is an oil field in the Khanty-Mansi Autonomous Okrug of Western Siberia, discovered in 1990, serving as LUKOIL's main testing ground for hard-to-recover reserves.
Srednebotuobinskoye field
The Srednebotuobinskoye field is a large oil and gas condensate field in the Republic of Sakha (Yakutia), discovered in 1970 and producing commercially since 2013.
Stabroek block
The Stabroek block is a 26,806 km² deepwater petroleum concession off Guyana operated by ExxonMobil, holding an estimated 11 billion barrels and producing since December 2019.
Stanlow Refinery
Stanlow Refinery is an oil refinery at Ellesmere Port, Cheshire, England, on the Manchester Ship Canal, owned by EET Fuels and producing about one-sixth of Britain's transport fuels.
Statfjord oil field
Statfjord is an oil and gas field in the northern North Sea, straddling the Norway–UK sector border, discovered by Mobil in 1974 and producing since November 1979.
Steam injection (petroleum)
Steam injection is an enhanced oil recovery method that heats heavy oil reservoirs with steam, cutting viscosity so oil can flow; main schemes include CSS, steam drive, and SAGD.
Steam-assisted gravity drainage
Steam-assisted gravity drainage (SAGD) is an enhanced oil recovery method that uses two horizontal wells to recover heavy oil and bitumen, widely used in Alberta's oil sands.
Stock-tank oil initially in place
Stock-tank oil initially in place (STOIIP), also called original oil in place (OOIP), is the total crude oil in a reservoir before production, measured at surface conditions.
Strategic Petroleum Reserve (India)
The Strategic Petroleum Reserve is India's government-held underground crude oil storage program, run by ISPRL, with 5.33 MMT of Phase I capacity covering about 9.5 days of crude requirement.
Structural trap
A structural trap is a hydrocarbon trap where folding, faulting, or upward salt movement stops migrating oil or gas, and it holds most of the world's reserves.
Sture oil terminal
The Sture oil terminal (Stureterminalen) is an Equinor-operated petroleum terminal in Øygarden, Norway, northwest of Bergen, which opened in 1988 and exports Oseberg Blend and Grane Blend crude oil.
Stybarrow oil field
Stybarrow is an offshore oil field in the Exmouth Sub-basin off Western Australia, discovered in 2003 and producing from 2007 to 2015 through the FPSO Stybarrow Venture.
Subba Oil Field
Subba Oil Field (صبة, also written Saba or Suba) is an oil field in Dhi Qar province, southern Iraq, with reserves estimated at over a billion barrels.
Subsea production tree
A subsea production tree, or wet Christmas tree, is an assembly of valves on a seabed wellhead that controls flow from a subsea oil or gas well.
Subsea wellhead
A subsea wellhead is a set of pressure-containing housings, hangers, and seals installed on the seabed, suspending casing and supporting the blowout preventer during drilling.
Sucker rod pump
A sucker rod pump, also called a beam pump, is an artificial-lift system that drives a downhole pump through a rod string, lifting oil from over 600,000 wells.
Suizhong 36-1 Oil Field
The Suizhong 36-1 Oil Field (绥中36-1油田) is a large heavy-oil offshore field in Liaodong Bay of the Bohai Sea, China, discovered in 1987 and wholly owned by CNOOC.
Superior refinery (Cenovus)
The Superior Refinery is an oil refinery in Superior, Wisconsin, the state's only refinery. Built in 1950, it processes 49,000 barrels per day for Cenovus Energy.