分配型示踪剂监测技术在超低渗透油藏开发中的应用

Application of Distributive Tracer Monitoring Technology in Ultra-Low Permeability Reservoir Development

长庆油田作为中国超低渗透油藏开发的典型油田,拥有巨大油气开发潜力。由于其储集层非均质性强、裂缝发育、剩余油分布复杂,油藏采收率普遍不高,亟需对油藏剩余油进行精细评价,以提高中高含水期井组开发效果。基于分配型示踪剂监测原理,论证井间剩余油测试可行性。以长庆油田Y306-57井组为研究对象,通过对分配型示踪剂监测成果与注入剖面、试井测试等常规动态监测资料进行综合分析,评价井组水驱效果、剩余油分布特征。结果表明:Y306-57井组存在西南向、东北向裂缝,在裂缝侧向剩余油相对富集;在纵向上,长6_(3)^(1)层为主力吸水层位,应进行堵水调剖作业。分配型示踪剂监测为井间剩余油监测提供了新方法,将其与常规动态监测资料综合分析,克服了单一评价方法的局限性,结果更加准确可靠,为精细评价超低渗透油藏水驱开发效果、制定剩余油挖潜措施提供借鉴。

Changqing oilfield,as a typical oil field of ultra-low permeability reservoir development in China,has great potential for oil and gas development.Due to the strong heterogeneity,fracture development and complex distribution of remaining oil in the reservoir,the recovery rate of the reservoir is generally low.Therefore,it is urgent to have a fine evaluation of the remaining oil in the reservoir to improve the development effect of the well group in medium-high water cut period.Based on the principle of distributive tracer monitoring,the feasibility of residual oil testing between wells is demonstrated in this paper.Taking well group Y306-57 of Changqing oilfield as the research object,water flooding effect and remaining oil distribution characteristics of well group are evaluated comprehensively by the analysis results of distributive tracer and common dynamic monitoring data such as water inject profile and pressure data.The results show that there are southwest and northeast fractures in well group Y306-57,and the remaining oil is relatively enriched in the lateral of the fractures.In the longitudinal direction,Chang 6_(3)^(1) is the main water absorption horizon,so it should be carried out water plugging and profile control operation.Distributive tracer monitoring provides a new method for residual oil monitoring between wells,comprehensive analysis with conventional dynamic monitoring data overcomes the limitation of single evaluation method,and the results are more accurate and reliable.Distributive tracer monitoring provids reference for fine evaluation of ultra-low permeability reservoir water flooding development effect and development of remaining oil tapping measures.