草南评价Ⅰ区蒸汽驱开采特征及开发效果评价

根据乐安油田草南评价Ⅰ区蒸汽驱注采连通慢、汽驱未见效期长、蒸汽驱受效较为缓和、井组问汽驱效果差异大及蒸汽驱驱替方式以热水驱为主等开采特征，提出了改善蒸汽驱开发效果的措施：汽驱初期加大整个评价Ⅰ区的提液力度，使采注比趋于合理；在优先保证汽驱注汽量的情况下，强化汽驱井组的吞吐引效；调整采油井工作参数。暂关高含水井，提高热能利用率；加强动态监测工作，为综合调整提供依据。采取这些措施后．整个区块的注采关系趋于合理，改善了注采井间的矛盾，使评价I区汽驱的日产油水平由低谷期的79t／d上升到217t／d，汽驱效果得到很大改善。

Evaluation of Production Characteristics and Effect of Steam Drive in Caonan Evaluation Region I

Based on the characteristics of slow communication of injection and production in steam drive, long non-responding period of the steam drive, moderate steam drive effect, big difference in steam drive effect between well groups and hot water flooding dominating the steam drive in Caonan Evaluation Region I of Le'an Oilfield, measures for improving the production effect of steam drive are proposed, which includes:emphasizing the liquid production to rationalize injection to production ratio; enhancing the steam soak effect of steam drive well group under the condition of insuring the amount of steam drive preferentially, adjusting the working parameter of producing wells; shutting off high water-cut wells temporarily so as to raise the thermal energy utility; enhancing dynamic monitoring to provide basis for integral adjustment. After these measures are implemented the injection to production relations tends rational in the whole block, by which the contradictions between injection-production wells are improved, daily oil production is raised to 217 t/d from 79 t/d in the area, and effect of steam drive is improved as well.