油页岩自生热原位转化直井与水平井开发效果数值模拟--以鄂尔多斯盆地旬邑地区油页岩为例  

Numerical simulation analysis on the development effect of vertical well and horizontal well during oil shale autothermic pyrolysis in-situ conversion process:a case study of oil shale in Xunyi area,Ordos Basin

作　　者：杨立红[1] 朱超凡 曾皓 苏建政[1] 王益维[1] 武俊文 陈旭东 郭威[2,3,4,5] Yang Lihong;Zhu Chaofan;Zeng Hao;Su Jianzheng;Wang Yiwei;Wu Junwen;Chen Xudong;Guo Wei(Sinopec Petroleum Exploration&Production Research Institute,Beijing 100083,China;College of Construction Engineering,Jilin University,Jilin Changchun 130026,China;National-Local Joint Engineering Laboratory of In-situ Conversion,Drilling and Exploitation Technology for Oil Shale,Jilin Changchun 130026,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Shale Oil&Gas Exploration and Development,Jilin University,Jilin Changchun 130026,China;Key Laboratory of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions,Jilin University,Jilin Changchun 130026,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]吉林大学建设工程学院,吉林长春130026 [3]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 [4]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 [5]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

出　　处：《石油学报》2023年第8期1333-1343,共11页Acta Petrolei Sinica

基　　金：中国石油化工集团有限公司科技部项目(P23159)资助。

摘　　要：油页岩是重要的化石能源,油页岩原位转化工艺具有绿色环保、占地面积小、开发成本低、可开发深部油页岩资源的优点,是油页岩工业的发展趋势,中国多次原位转化先导试验采用直井方式均成功产出油页岩油,但均出现产量低且不稳定、波及系数小等问题。以鄂尔多斯盆地旬邑地区油页岩为研究对象,运用数值模拟方法对比了油页岩自生热原位转化直井与水平井开发效果差异。研究结果显示,旬邑地区油页岩自生热原位转化局部最高温度均超过1000℃,含油饱和带主要处于温度范围为250~350℃的区域内,局部最高含油饱和度达到72%,干酪根裂解主要发生在温度达到350℃的地层中,干酪根裂解后孔隙度由6.4%增加至15.5%。其中,直井自生热原位转化累积产油量为432 m^(3),最高产油量为1.85 m^(3)/d,水平井自生热原位转化累积产油量为7260 m^(3),最高产油量为46.7 m^(3)/d。直井自生热原位转化总能量回报率仅有0.79,而水平井自生热原位转化总能量回报率达到2.48,油页岩直井和水平井自生热原位转化最优关井时间分别为第4.5年和第7年。Oil shale,as a major fossil energy,is an important alternative resource for conventional oil and gas.In-situ conversion process(ICP)is characterized by environmental protection,small footprint and low development cost,which can be used to exploit deep oil shale resources,as being the development trend of oil shale industry.Several in-situ conversion pilot tests in China have successfully produced shale oil by vertical well,yet there are still shortcomings such as low productivity,instability and low sweep efficiency.This paper is a case study of oil shale formation in Xunyi area,and the numerical simulation method is used to compare the development effects of vertical and horizontal wells during autothermic pyrolysis in situ conversion process(ATS)of oil shale.The results show that the local maximum temperature of ATS of oil shale in Xunyi area exceeds 1000℃.The oil saturation zone is mainly distributed in the temperature range of 250℃to 350℃,and the local maximum oil saturation can reach 72%.The kerogen cracking mainly occurs in the formation at the temperature of 350℃,and after that the porosity is increased from 6.4%to 15.5%.Specifically,the cumulative oil production during ATS in vertical wells amounts to 432 m^(3),and the highest daily oil production hits 1.85 m^(3) per day;the cumulative oil production of horizontal wells is up to 7260 m^(3),and the highest daily oil production is 46.7 m^(3) per day.The total energy return during ATS by vertical wells is only 0.79,while that by horizontal wells is up to 2.48.Moreover,the optimal shut-in time during ATS of oil shale by vertical wells and horizontal wells is after 4.5 years and 7 years,respectively.

关 键 词：旬邑地区 油页岩 原位转化 直井 水平井 能量回报率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]