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Key Learnings from First 2 Years of a Full Field CSS Development in Oman
Bettembourg, Solenn (Petroleum Development Oman LLC) | Holyoak, Steve (Petroleum Development Oman LLC) | Alwazeer, Abdullah (Petroleum Development Oman LLC) | Manhali, Mohammed (Petroleum Development Oman LLC) | Rawahi, Mohammed (Petroleum Development Oman LLC) | Habsi, Amur (Petroleum Development Oman LLC)
Abstract The "A" East Haradh formation contains a 200 m thick oil column of highly viscous oil, with viscosity ranging from 200 to 400,000 cp. Due to the high viscosity, first production was considered only possible using thermal EOR techniques, starting with Cyclic Steam Stimulation (CSS). The field has now been in operation for more than two years, with a number of wells already into a third CSS cycle. This paper will focus on the key learnings derived during this initial operations phase of CSS in "A" East Field including, amongst others, key trial results on different well completions and artificial lift systems combined with new insight into the reservoir architecture. In addition, reservoir performance management is being streamlined through the development of a structured approach to the CSS planning and using dedicated visualisation. Automated Exception Based Surveillance "triggers" are currently being developed to efficiently address any deviation from the operating envelopes and further optimise the recovery from this 81 well CSS development. Based on the very encouraging performance to date, the company has already sanctioned a further 34 well CSS expansion of the current development with drilling scheduled to commence in 2016.
- Asia > Middle East > Saudi Arabia > Eastern Province > Al-Ahsa Governorate > Arabian Basin > Widyan Basin > Ghawar Field > Haradh Field > Lower Fadhili Formation (0.98)
- Asia > Middle East > Saudi Arabia > Eastern Province > Al-Ahsa Governorate > Arabian Basin > Widyan Basin > Ghawar Field > Haradh Field > Khuff D Formation (0.98)
- Asia > Middle East > Saudi Arabia > Eastern Province > Al-Ahsa Governorate > Arabian Basin > Widyan Basin > Ghawar Field > Haradh Field > Khuff C Formation (0.98)
- (4 more...)
Abstract 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.
- North America > United States (1.00)
- Asia > Middle East > Oman > Central Oman (0.24)
- Asia > Middle East > Oman > Al Wusta Governorate > Haima (0.24)
- Geology > Petroleum Play Type > Unconventional Play > Heavy Oil Play (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.35)
- Asia > Middle East > Oman > Central Oman > South Oman Salt Basin > Mahwi Formation (0.99)
- Asia > Middle East > Oman > South Oman > South Oman Salt Basin > Gharif Formation (0.98)
- Asia > Middle East > Saudi Arabia > Eastern Province > Al-Ahsa Governorate > Arabian Basin > Widyan Basin > Ghawar Field > Haradh Field > Lower Fadhili Formation (0.96)
- (6 more...)