针对常规化学示踪剂种类少、有毒害、检测精度低,PLT测井技术不能监测水平井、大斜度井产液剖面的局限性,利用地层中不存在或含量极低的非放射性微量金属物质制备了微量金属物质示踪剂,对其性能进行了评价,并通过优化工艺流程,建立数据分析方法,形成了系统的非放射性微量金属物质示踪剂监测技术,并在现场进行了应用。结果表明:非放射性微量金属物质示踪剂耐温为200 ℃,耐盐为25×104mg/L,在pH值为1和14的溶液中能保持澄清状态,并不会被储层中的黏土物质吸附,检测精度高达10-14kg/L。该示踪剂可有效监测产液剖面,并可分析压裂裂缝形态,评价压裂效果。使用该技术对延长油田一口水平井产液情况进行了监测,通过示踪剂归一化产出曲线分析了裂缝发育情况,为压裂效果评价提供了技术数据。该技术可为产液剖面监测、压裂裂缝发育状况评测提供技术支持。
In view of the limitations that conventional chemical tracers are of few types, toxic and low in detection accuracy and PLT logging technology fails to monitor the produced fluid profile of horizontal wells and highly inclined wells, trace metal tracer was prepared by using non-radioactive trace metal substances that do not exist or exist in very low content in the formation, and its performance was evaluated. Meanwhile, data analysis method was developed with optimized process flow. A systematic technology for monitoring non-radioactive trace metal tracer was developed and applied in the field. The results show that the non-radioactive trace metal tracer had a temperature resistance of 200 ℃ and a salt resistance of 25×104mg/L. It could remain clear in the solutions with pH values of 1 and 14, and would not be adsorbed by clay substances in the reservoir. The detection accuracy was up to 10-14kg/L. The tracer was effective in monitoring the produced liquid profile, analyzing the fracture morphology and evaluating the fracturing effect. This technology was used to monitor the fluid production of a horizontal well in Yanchang Oilfield, and the fracture development was analyzed by the normalized output curve of the tracer, providing technical data for the evaluation of fracturing effect. This technology provides technical support for produced fluid profile monitoring and fracture development evaluation.
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