The "A" Steam Project in Southern Oman is a large scale Thermal EOR project currently being executed by PDO. It comprises the re-development of the "A" West Field, which has a significant cold oil development history, and the new development of the nearby "A" East Field.

The heavy viscous oil is contained in high net-to-gross braided river, aeolian and alluvial fan sandstones of the Cambrian Haima Group. Both fields were discovered in the 1970"s. The "A" West Field has lower oil viscosity and was first produced in 1976. "A" East oil is significantly more viscous than "A" West oil and was historically assessed to be too viscous for cold production. For this reason "A" East Field was not initially developed. In contrast, by 2008, after some 30 years of cold oil production, an estimated 18% of the STOIIP had been recovered from "A" West and the water cut had steadily increased to 90%.

A field study was initiated in 2008 to evaluate re-development options based on EOR technologies. For "A" West the selected Phase I (re-) development concept comprised a steam flood with inverted 7-spot patterns. For "A" East the plan was for initial cyclic steam soak (CSS) on a regularly spaced 92 × 92 m grid, with later conversion to a 8 acre / 9 spot steam flood. The two sub-surface developments were to be managed as an integrated project with shared surface facilities and operations. The project received Final Investment Decision for Phase I in 2009 and came on stream in 2013.

The paper will provide an overview of the project development phases & its execution strategy, current status of field performance, and specifically the innovative way the development challenges are addressed.

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