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A starch graft copolymer (SGC) gel is proposed to assist CO2 huff-n-puff for further enhanced oil recovery in a water channeling reservoir. The SGC gelant can form a 3D solid-like gel, and then effectively enlarge CO2 sweep efficiency.

Production sharing contracts have been used in the development of China's offshore petroleum resources since 1982, but the mechanism in which the fi scal terms impact project economics is complicated and not well understood. The purpose of this paper is to model China's offshore production sharing contracts using a probabilistic approach. Cash fl ows and economic indicators are used for a typical offshore oilfi eld development, and meta-models are constructed to analyze the basic features of the fi scal system. Applications of the models in contract negotiation are discussed.