1,082 articles
Contingent resources
Contingent resources are quantities of petroleum estimated to be potentially recoverable from known accumulations, but not yet commercially developable because contingencies remain unresolved, per the SPE PRMS.
Core analysis
Core analysis is the laboratory study of rock samples taken during or after drilling a well, measuring reservoir properties such as porosity, permeability, and fluid saturation.
Costayaco Oil and Gas Field
Costayaco is an oil field in the Chaza Block of the Putumayo Basin in southwestern Colombia, discovered by Gran Tierra Energy in 2007 and producing since then.
Crude distillation
Crude distillation is the first step of oil refining, heating crude oil in a furnace and splitting it by boiling point into fractions like naphtha, kerosene, and diesel.
Cruz de Lorena Oil and Gas Field
Cruz de Lorena Oil and Gas Field is a Vaca Muerta shale field in Neuquén Province, Argentina, producing since 2013 and operated by Shell Argentina with Gas y Petróleo del Neuquén.
Culebra Oil and Gas Field
Culebra Oil and Gas Field is an onshore oil and gas field in the Ecuadorian Amazon, discovered in 1973 and operated by the state company EP Petroecuador.
Cusiana Field
Cusiana Field is a giant oil and gas field in the Llanos Foothills of Casanare, Colombia, discovered in 1988 and once producing over 37% of the country's oil.
Cusiana Oil and Gas Field
Cusiana is a giant oil and gas field in the Llanos foothills of Casanare, eastern Colombia, discovered by BP in 1991 and now operated by Ecopetrol.
Cuyabeno Oil and Gas Field
The Cuyabeno Oil and Gas Field is an operating onshore oil field in Block 58 of Ecuador's Oriente basin, in Sucumbíos province, discovered in 1972 and wholly owned by EP Petroecuador.
Cyclic steam stimulation
Cyclic steam stimulation, also called huff-and-puff or steam soak, is an enhanced oil recovery method in which steam is injected into a well, the well soaks, and heated oil is produced.
D-1 oil field (India)
The D-1 oil field is an offshore field in the Arabian Sea about 200 km southwest of Mumbai, discovered in 1976 and operated by India's ONGC.
Dación Oil and Gas Field
Dación Oil and Gas Field is an onshore conventional-heavy oil field in the Oficina trend of eastern Venezuela, discovered in 1940, producing since 1944, and operated by PDVSA since 2007.
Dahra Oil and Gas Field
Dahra Oil and Gas Field (الظهرة), also written Al-Dhara, is a giant onshore oil field in Libya's Sirte Basin, discovered in 1958 and operated by the Waha Oil Company.
Dai Hung Oil and Gas Field
Dai Hung is an offshore oil and gas field in Vietnam's Nam Con Son Basin, producing since 1994 and nearly abandoned by its international consortium in 1999.
Daleel Oil Field
The Daleel oil field is an onshore oil field in the Wadi Aswad concession area of Block 5 in northwestern Oman, on stream since 1990.
Dalpari Oil Field
The Dalpari Oil Field is an onshore oil field in Ilam province, western Iran, owned by the National Iranian Oil Company, discovered in 1978 and producing since 1999.
Daly Sinclair Oil Field
The Daly Sinclair Oil Field is an oil field in southwestern Manitoba, Canada, and the province's largest, formed in 2010 by amalgamating the Daly and Sinclair fields.
Dammam development project
The Dammam development project is a two-phase Saudi Aramco crude oil project in Saudi Arabia adding 75 thousand barrels per day, phased onstream in 2025 and 2027.
Dan Oil and Gas Field
Dan is an oil and gas field in the Danish North Sea, discovered in 1971 and onstream in 1972 as Denmark's first producing oil field.
Danube Refinery
The Danube Refinery (Dunai Finomító) is an oil refinery in Százhalombatta, Hungary, about 30 km south of Budapest, operated by MOL Group with a capacity of 8.1 million tonnes per year.
Daqing Field
Daqing Field (大庆油田) is a giant oil field in Heilongjiang Province, China, discovered in 1959; it is China's largest and a pioneer of polymer flooding and chemical enhanced oil recovery.
Darquain Oil Field
Darquain Oil Field, also known as Darkhovin, is a giant onshore oil field in Khuzestan province, southwestern Iran, holding an estimated 8 billion barrels of oil in place.
Decline curve analysis
Decline curve analysis fits empirical decline models, chiefly the Arps equations, to a well's production rate history to forecast future output and estimate recoverable reserves, including in shale reservoirs.
Deepsea Bergen
Deepsea Bergen is a semi-submersible drilling rig operated by Odfjell Drilling on the Norwegian continental shelf, delivered in 2019 and renamed from Deepsea Bollsta in 2026.
Deepsea Stavanger
Deepsea Stavanger is a sixth-generation semi-submersible drilling rig owned and operated by Odfjell Drilling, delivered in 2010 by DSME in South Korea for deepwater, harsh-environment drilling.
Deepwater Horizon
Deepwater Horizon was an offshore drilling rig that exploded on April 20, 2010, in the Gulf of Mexico, killing 11 workers and spilling millions of barrels of oil.
Dehloran Oil Field
The Dehloran Oil Field is an onshore oil field in Ilam Province, northwestern Iran, near the Iraqi border, discovered in 1972 with reserves of 550 million barrels.
Delayed coking
Delayed coking is a semi-batch thermal cracking process that converts vacuum residue into gases, naphtha, gas oils, and petroleum coke, accounting for 88% of world coking capacity.
Donges Refinery
The Donges refinery is an oil refinery in Donges, western France, on the Loire estuary, owned and operated by TotalEnergies with a capacity of 219,000 barrels per day.
Doroud Oil and Gas Field
The Doroud Oil and Gas Field is Iran's largest offshore oil field, an anticline in the northern Persian Gulf partly underlying Kharg Island, discovered in 1961.