油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (3): 333-342.doi: 10.13809/j.cnki.cn32-1825/te.2024.03.003
段宏亮1(),谌廷姗1,孙敬2,洪亚飞1,李思辰2,卢显荣1,张正阳2
收稿日期:
2024-01-29
出版日期:
2024-06-26
发布日期:
2024-07-10
作者简介:
段宏亮(1977—),男,博士,高级工程师,主要从事油气勘探研究工作。地址:江苏省扬州市邗江区维扬路188号,邮政编码:225009。E-mail: 基金资助:
DUAN Hongliang1(),SHEN Tingshan1,SUN Jing2,HONG Yafei1,LI Sichen2,LU Xianrong1,ZHANG Zhengyang2
Received:
2024-01-29
Online:
2024-06-26
Published:
2024-07-10
摘要:
页岩油藏具有复杂的孔隙结构和超低渗透能力,合理评价储层基质和压后不同类型裂缝流动能力对制定合理工作制度和有效开发页岩油藏具有重要指导作用。采用巴西劈裂方法模拟不同裂缝形态,基于核磁共振技术构建了一套评价基质和裂缝流动能力方法,并以苏北盆地高邮凹陷阜宁组二段(以下简称阜二段)页岩岩心为基础开展了基质和裂缝导流能力评价研究。实验结果表明:页岩储层最小流动孔隙尺度为10 nm,应力条件下流动规律表现为非线性、线性两段式;影响裂缝系统导流能力因素包括裂缝类型、开度、应力大小和驱动压差等;应力越大渗透率损失越大,最高可达95%,缝网越复杂开度越大,渗透率损失越大;生产过程中需要依据裂缝发育情况、上覆岩层有效应力特征来合理控制地层流体压力与井底流压的差值,保障油井能稳定生产,压力均匀向外传播;高邮凹陷阜二段页岩油井有效应力介于7~10 MPa、流动压差介于10~15 MPa为合理下泵时机或进行地层补能时机。研究成果对完善页岩渗流机理理论和现场应用具有重要意义。
中图分类号:
段宏亮,谌廷姗,孙敬,洪亚飞,李思辰,卢显荣,张正阳. 苏北盆地页岩油基质与裂缝流动能力实验研究[J]. 油气藏评价与开发, 2024, 14(3): 333-342.
DUAN Hongliang,SHEN Tingshan,SUN Jing,HONG Yafei,LI Sichen,LU Xianrong,ZHANG Zhengyang. Experimental study of oil matrix and fracture flow capacity of shale oil in Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 333-342.
表2
基质岩心多次饱和实验数据及结果"
岩心实验次数 | 最大饱和 压力/MPa | 饱和 时长/h | 累计饱和 油量/mL | 累计含油 饱和度/% |
---|---|---|---|---|
J1第一次饱和 | 15.7 | 23 | 0.014 6 | 2.36 |
J1第二次饱和 | 21.6 | 31 | 0.036 3 | 2.88 |
J1第三次饱和 | 26.2 | 37 | 0.057 2 | 9.26 |
J1第四次饱和 | 31.4 | 35 | 0.059 7 | 9.66 |
J1第五次饱和 | 36.2 | 38 | 0.060 9 | 9.86 |
J2第一次饱和 | 15.7 | 28 | 0.236 0 | 25.64 |
J2第二次饱和 | 21.1 | 48 | 0.248 2 | 26.97 |
J2第三次饱和 | 26.2 | 50 | 0.268 9 | 29.22 |
J2第四次饱和 | 31.2 | 39 | 0.277 5 | 30.15 |
J2第五次饱和 | 36.1 | 42 | 0.282 1 | 30.65 |
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