关键词: 稠油油藏, 可行性分析, 蒸汽驱, 热连通, 间歇注气

Abstract: Aiming at W block in J Oilfield, combining screening criteria, theoretical calculation and numerical simulation method, while evaluating reservoir properties, remaining reserves and development status, a feasibility evaluation method of steam ensuing steam stimulation was established. Then the steam feasibility of target block was evaluated: It turns out that the geological characteristics of this block agreed well with the screening standard of steam flooding. Furthermore, the steam flooding generates a higher recoverable reserve than steam stimulation, the effective heat communication was formed between wells, and he degree of reservoir heated during stimulation stage can meet the needs of steam flooding. The project of converting to steam flooding after steam stimulation was optimized. It was determined that conducting the intermittent steam injection performed a better flooding effect when the recovery factor of steam stimulation reached 15.20%, in which steam injection time, interval time, steam injection rate, steam quality and production⁃injection ratio were 3 months, 1 month, 133.33 t/d, 0.60 and 1.3 respectively. The recovery factor was 42.3% when the oil⁃steam ratio reached 0.12, 29.6% higher than that of steam stimulation. This study contributed an evaluation method for steam flooding ensuing stimulation, and provided a good reference to similar reservoirs.

Key words: Heavy oil reservoir, Feasibility study, Steam flooding, Thermal inter?well communication, Intermittent steam injection