Parameters Optimization for Superheated Steam Huff and Puff and Superheated Steam Flooding with Horizontal Wells in Heavy Oil Reservoir

The optimized parameters suitable for general wet steam huff and puff and steam flooding will not apply to superheated steam because its quality equals to 1. In order to optimize the parameters of superheated steam huff and puff and superheated steam flooding with horizontal well, the numerical model was established based on formation and fluid data of K oilfield. Then, the optimal horizontal well length, cycle steam injection intensity, injection rate, the degree of superheat, soak time and production rate were selected. Meanwhile, the well pattern, the timing for flooding and injection rate were optimized. Finally, the optimal injection-production parameter combination of superheated steam huff and superheated steam flooding is obtained. The results show that the optimal length of horizontal well with superheated steam huff and puff in K oil field is 200–300 m, cycle steam injection intensity is 10 t/m, injection rate is 200 t/d, the degree of superheat is 40 ℃, soak time is 5 d, and production rate is 60 t/d. The optimal well pattern in the superheated steam flooding with horizontal well is staggered well pattern, the optimal timing for drive is after 6 cycles of huff and puff, the injection rate is 80 t/d and production-injection ratio of 1.2. The optimal injection-production parameters provide theoretical guidance for the development of superheated steam huff and puff and superheated steam flooding with horizontal wells in heavy oil reservoirs.