饶阳凹陷页岩油储层应力敏感规律

王秀影; 吴通; 蔡军; 熊战; 郭广峰; 张明

doi:10.3969/j.issn.1001-5620.2020.02.009

饶阳凹陷页岩油储层应力敏感规律

doi: 10.3969/j.issn.1001-5620.2020.02.009

王秀影¹,
吴通²,
蔡军³,
熊战⁴,
郭广峰⁵,
张明⁶

1. 华北油田公司工程技术研究院, 河北任丘 062550;
2. 中国石油大学(北京), 北京 102249;
3. 华北油田公司勘探事业部, 河北任丘 062550;
4. 中石油渤海钻探第二钻井公司河北廊坊 065000;
5. 内蒙古煤炭建设工程总公司钻井定向工程处, 呼和浩特 010020;
6. 华北油田公司第一采油厂, 河北任丘 062550

基金项目:

中国石油天然气股份有限公司重大专项“华北油田持续有效稳产勘探开发关键技术研究与应用”（2017E-15）

详细信息

作者简介:
王秀影,现在主要从事钻完井技术研究。电话18631768029;E-mail:cyy_wxy@petrochina.com.cn

中图分类号: TE258
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出版历程
- 收稿日期: 2019-11-27
- 刊出日期: 2020-04-28

Patterns of Stress Sensitivity of the Shale Oil Reservoirs in Raoyang Depression

1. Engineering Technology Research Institute of Huabei Oilfield Company, Renqiu, Hebei 062550;
2. China University of Petroleum, Beijing 102249;
3. Exploration Department of Huabei Oilfield Company, Renqiu, Hebei 062550;
4. The Second Drilling Company, BHDC, Langfang, HEbei 065000;
5. Drilling Orientation Engineering Office of Inner Mongolia Coal Construction Engineering Corporation, Hohhot, Inner Mongolia 010020;
6. Huabei Oilfield Company First Oil Production Plant, Renqiu, Hebei 062550

摘要

摘要: 饶阳凹陷页岩油储量丰富，但页岩容易发生应力敏感，需测试该区块的应力敏感程度，寻找应力敏感规律，为生产制度提供基础数据。室内利用X-射线衍射全岩分析、荧光薄片及电镜扫描等方法，分析了储层矿物的组成、微观结构及连通度共11组，储层应力敏感性流动实验3组，利用数据拟合的方法获得该区块的应力敏感在渗透率损失20%时的规律，净应力与黏土及脆性矿物含量的公式为P_c=-0.09796m_c+0.2385m_b-7.8145；不可逆渗透率伤害率与黏土及脆性矿物含量公式为K_i=93.24+0.2797m_c-0.6809m_b的关系；其中，不可逆渗透率伤害率为52.09%，在渗透率损失20%时对应的净应力在3 MPa以内，进一步分析其原因是由于不同黏土含量造成不同的微裂缝的开合程度，但是脆性矿物含量决定不可逆渗透率伤害率及渗透率损失20%时对应的净应力值。结果表明，饶阳凹陷地区的页岩油储层应力敏感与与黏土矿物含量呈负相关，与脆性矿物含量呈正相关。同时通过研究页岩油储层应力敏感性规律的拟合方法，为再解决上述类似储层由于岩样样本数量少，利用有限的岩心柱塞表征整个地层的敏感规律，提供一种新的测试方法。
- 非常规油气 /
- 页岩油 /
- 储层伤害 /
- 黏土 /
- 非黏土矿物 /
- 应力敏感性 /
- 破碎性储层
Abstract: The Raoyang depression is enriched with abundant shale oil. It is well known that shale formations are generally developed with stress sensitivity, therefore the degree of stress sensitivity in this area should be measured and patterns of stress sensitivity be found to provide basic data for field production. Eleven sets of experiments on the mineral composition, microstructure and connectivity of the reservoir formations, and three sets of flow experiments on reservoir stress sensitivity were conducted using XRD whole mineral analyses, fluorescent thin layer analyses and SEM. At permeability loss of 20%, the stress sensitivity patterns of the Raoyang depression was obtained with data fitting. The relationship between net stress, clay content and brittle mineral content is this:-0.09796m_c+0.2385m_b-7.8145. The relationship between irreversible permeability loss, clay content and brittle mineral content is this:93.24+0.2797m_c-0.6809m_b. The percent irreversible permeability loss is 52.09% and the net stress corresponding to permeability loss of 20% is within 3 MPa. Further analyses showed that different opening sizes of the micro fractures resulted from different clay contents are responsible for the relationships, the content of brittle minerals decides the irreversible permeability impairment and the net stress corresponding to 20% of permeability loss. The experimental results showed that stress sensitivity in the shale oil reservoirs in Raoyang depression is negatively correlated to the content of clay content, and is positively corelated to the content of brittle minerals. When the amount of reservoir rock samples is not enough to characterize the patterns of the whole formation, the data fitting method described in this study provides a way of using limited core plugs to realize the goal of whole formation characterization.
- Unconventional oil n gas /
- Shale oil /
- Reservoir damage /
- Clay /
- Non-clay mineral /
- Stress sensitivity /
- Fractured reservoir

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参考文献(17)

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