The COSH Process (COSH is the acronym of Combustion Override Split-production Horizontal-well) was conceived based on experience gained from a number of successful gravity drainage processes and the less fortunate fireflood process. Typical combustion operational problems such as early oxygen breakthrough, severe sanding and gas locking of downhole pumps are minimized by using an innovative well arrangement to segregate and control the fluid flows. This process is perceived to work very well in a wide variety of reservoirs, ranging from oil sands to conventional bottom water reservoirs.

In February 1994, a joint ADOE/Industry COSH Process Development Task Force consisting of 18 industry, government and research member companies was formed to assess the commercial development potential of COSH in Western Canada. The performance and economics of six high potential field applications, including Athabasca McMurray tar sands, Provost McLaren channel sand, undeveloped Cold Lake Clearwater oil sands, Battrum Roseray, Bellshill Lake Blairmore sand and cyclic steam stimulated Cold Lake Clearwater oil sands, were studied. This paper compares the results of this study and outlines the major technical issues identified by the Task Force.

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