注采井数比对抚顺油页岩注高温氮气原位转化开采的影响

Influences of injection?鄄production wells ratio on in?鄄situ conversion production of 
high?鄄temperature nitrogen injection in Fushun oil shale

厉家宗 朱超凡 徐绍涛 董光顺 郭威

吉林大学建设工程学院，吉林 长春 130026 吉林大学油页岩地下原位转化与钻采技术国家地方联合工程实验室，吉林 长春 130026 吉林大学教育部页岩油气资源勘探开发省部共建协同创新中心，吉林 长春 130026 吉林大学自然资源部复杂条件钻采技术重点实验室，
吉林 长春 130026

School of Construction Engineering, Jilin University, Changchun 130026, China National and Local Joint Engineering Laboratory of Oil Shale In?鄄situ Conversion and Drilling Technology, Jilin University, Changchun 130026, China Ministry of Education Shales Oil and Gas Resources Exploration and Development Provincial Co?鄄established Collaborative Innovation Center, Jilin University, Changchun 130026, China Ministry of Natural Resources Key Laboratory of Complex Drilling and Mining Technology, Jilin University, Changchun 130026, China

油页岩原位转化技术是油页岩工业的发展趋势，注高温氮气是一种对流加热油页岩地下原位转化开采技术，具有工艺简单、安全环保、加热效率高、经济效益好等优点。文中以抚顺油页岩为研究对象，运用数值模拟方法，研究了油页岩注高温氮气原位转化过程，并分析了常规油气田开采5种布井方式对应的注采井数比对开发效果的影响。结果表明：常规油气田开采中，以注采井数比1∶1为界，增大注采井数比有利于缩短生产时间，减小注采井数比有利于增大能量效率；注采井数比为1∶3或1∶2时，油气产量受到生产井处地层渗透率、孔隙度变化的影响，生产过程出现2个峰值；通过对比不同布井方式，注采井数比为1∶2的反七点井网法单位体积产油量最大，能量效率最大为56%，开采效果最优。该研究成果为油页岩注氮气原位开采的现场应用提供参考。

In?鄄situ conversion technology of oil shale is the development trend of oil shale industry. High?鄄temperature nitrogen injection is a a production technology using convective heating to promote in?鄄situ conversion of oil shale, which has the advantages of simple process, safety and environmental protection, high heating efficiency and good economic benefits. In this study, the Fushun oil shale was used as the research object, and the in?鄄situ conversion of high?鄄temperature nitrogen injection into the oil shale was studied using numerical simulation methods, the influences of injection?鄄production wells ratio of five kinds of well pattern on development effects in conventional oil and gas fields were analyzed. The results show that in conventional oil and gas fields, with the injection?鄄production wells ratio limit of 1∶1, increasing the ratio is beneficial to shortening production time, and decreasing the ratio is beneficial to increasing energy efficiency. When the injection?鄄production wells ratio is 1∶3 or 1∶2, the production of oil and gas is affected by the change of formation permeability and porosity at the production wells, and two peaks appear in the production process. By comparing different well patterns, the inverse seven?鄄spot well pattern method with injection?鄄production wells ratio of 1∶2 has the highest oil production per unit volume, which has the highest energy efficiency of 56% and the best recovery effect. This study provides a reference for the field application of nitrogen injection in?鄄situ production of oil shale.

10.6056/dkyqt202305006