基于微注入压降测试的页岩气储层快速评价方法

发布时间：2018-04-21 12:28

本文选题：页岩气 + 微注入压降测试　；参考：《石油钻探技术》2017年03期

【摘要】：页岩气储层渗透率非常低,采用常规压力恢复测试方法评价储层时需要很长时间才能探测到径向流动,导致效率非常低,而微注入压降测试方法可以使页岩气储层在较短时间内出现拟径向流,从而实现储层的快速评价。在分析微注入压降测试方法快速评价页岩气储层原理的基础上,针对涪陵页岩气储层特点,从设备选择、注入排量、总注入量和注入液体选择等方面对微注入压降测试施工参数进行了优化设计。研究结果发现,涪陵页岩气田可以采用150~500L/min排量注入清水进行微注入压降测试,待地层破裂后再持续泵注10~30min,注入总量控制在5~15m3,就可以获得较好的测试结果。采用微注入压降测试方法对涪陵页岩气田6口页岩气井储层进行了评价,通过对压降测试曲线进行G函数分析获得了原始地层压力和储层有效渗透率,其与试验分析和压力测试结果相吻合。这表明,采用微注入压降测试方法可以实现对页岩储层的快速评价。
[Abstract]:The permeability of shale gas reservoir is very low, and it takes a long time to detect radial flow when conventional pressure recovery test method is used to evaluate the reservoir, which results in very low efficiency. The micro-injection pressure drop test method can make the shale gas reservoir appear pseudo-radial flow in a short time, so that the rapid evaluation of the reservoir can be realized. On the basis of analyzing the principle of rapid evaluation of shale gas reservoir by microinjection pressure drop test method, according to the characteristics of Fuling shale gas reservoir, from the selection of equipment, injection and displacement, The construction parameters of microinjection pressure drop test are optimized in terms of total injection volume and injection liquid selection. The results show that the pressure drop test can be carried out with 150~500L/min displacement injection of clear water in Fuling shale gas field, and the pressure drop can be measured by pump injection for 10 ~ 30 min after formation rupture, and the total injection amount is controlled at 515 m ~ 3, and a good test result can be obtained. Six shale gas well reservoirs in Fuling shale gas field were evaluated by microinjection pressure drop test method. The original formation pressure and effective permeability of the reservoir were obtained by G function analysis of the pressure drop test curve. It coincides with the experimental analysis and pressure test results. This indicates that the rapid evaluation of shale reservoir can be realized by using microinjection pressure drop test method.
【作者单位】：油气资源与工程国家重点实验室(中国石油大学(北京));中石化石油工程技术服务有限公司特种作业事业部;中石化江汉石油工程有限公司;
【基金】：国家自然科学基金重大国际(地区)合作项目“页岩气藏水平井完井与多级压裂增产的基础研究”(编号:51210006);国家自然科学基金石油化工联合基金(A类)项目“深层高温高压油气井安全高效钻完井基础研究”(编号:U1562212)联合资助
【分类号】：TE37

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