This paper gives essential informaiton on two commercial in situ combution (ISC) projects in India, one commercial ISC project in Romania and one commercial ISC project in the USA. The ISC project at Suplacu de Barcau, Romainia is the largest project of its kind, and it has been in operation for 34 years as a dry ISC process. The Balol and Santhal Projects in Inida have been in operation for more than seven years, and have been applied in a wet mode. Currently, these three projects produce more than 500 m 3 /day (3,450 bbl/day) from each project, while all three combined produce approximately 2,300 m 3 /day (15,860 bbl/day). Additionally, the project operated by Bayou State Oil Corporation (BSOC) in Bellevue, Louisiana, USA produces 51 m 3 /day (320 bbl/day). This total amount of 2,350 m 3 /day represents the total amount of heavy oil produced by ISC today. This first three projects are operated using a peripheral fine drive starting from the uppermost part of the reservoir and going downdip. While the Suplacu de Barcau project occurs in a typical solution gas drive, shallow heavy oil reservoir, the Balol and Santhal projects are applied successfully in deeper reservoirs, having strong lateral water drive. The BSOC Bellevue ISC project has been in operation for more than 34 years. It is a dry ISC process, and it has been conducted in patterns. Currently, it has 15 air injectors and 90 production wells.
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