The Upper Vedder sand is the main productive horizon in Mount Poso, a heavy oil field in San Joaquin Valley, California. It is a homogeneous sand with very high porosity, permeability, and N/G ratio. Following 45 years of primary production, a very successful steam drive has been in operation since 1971. This line drive thermal development with updip steam injection is now at its final stages. The purpose of the simulation study is to determine the changes in operating policy to optimize financial performance. The study consists of developing a numerical reservoir simulation model, calibrating the model, testing various operating scenarios, and making recommendations. The recommendations include a series of steam cuts, steam injector moves, and increased aquifer withdrawals. These recommendations are currently being implemented. Results to date are also discussed.

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