微观孔隙结构对页岩应力敏感影响的实验研究

张睿,宁正福，杨峰，赵华伟，杜立红，廖新维

doi:10.11764/j.issn.1672-1926.2014.08.1284

天然气地球科学 >

2014 , Vol. 25 >Issue 8: 1284 - 1289

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.08.1284

非常规天然气

微观孔隙结构对页岩应力敏感影响的实验研究

展开

(1.中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249；
2.中国石油大学(北京)石油工程教育部重点实验室，北京 102249；
3.中国石油华北油田，河北任丘 062552 )

张睿（1986-），男，新疆昌吉人，博士研究生，主要从事非常规油气开发研究. E-mail：vvvbst2005@163.com.

收稿日期: 2013-10-22

修回日期: 2013-11-29

网络出版日期: 2014-08-10

基金资助

高等学校博士学科点专项科研基金项目“页岩储层多尺度耦合渗流规律研究”（编号：20120007110012）；教育部科学技术研究重大计划“页岩气流动机理与产能预测模型研究”（编号:311008）联合资助.

收起

Experimental Study on Microscopic Pore Structure Controls on Shale Permeability under Compaction Process

Expand

（1.State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum,Beijing 102249,China;
2.Key Laboratory of Petroleum Engineering of the Ministry of Education，China University of Petroleum，Beijing 102249,China；3.Huabei Oilfield Company,PetroChina,Renqiu 062552,China）

Received date: 2013-10-22

Revised date: 2013-11-29

Online published: 2014-08-10

Fold

摘要

研究页岩储层在开发过程中的应力敏感对产能评价具有重要意义。通过脉冲法测量了渝南下寒武统牛蹄塘组2块页岩岩心的应力敏感曲线，应用毛管理论推导了毛管半径随有效应力变化的关系式，结合扫描电镜图像分析了孔径变化对应力敏感的响应特征。最后采用低温液氮吸附实验研究了页岩的微观孔隙结构特征，同时对毛管半径应力敏感公式进行了验证。研究结果表明：该地区2块页岩岩样均体现出强应力敏感，其渗透率随有效应力的变化符合指数关系式；毛管半径随有效应力的变化同样符合指数关系，孔隙越容易被压缩，毛管半径保留率越低，应力敏感越强；低温液氮吸附实验结果验证了毛管半径应力敏感公式的有效性，表明了在MK64-2岩样中，大孔比例较少，压缩过程中平均毛管半径保留率更低，小孔的比例较高，其压缩后提供给大孔的渗流通道较少，因此该岩样应力敏感性更强。

关键词： 页岩; 应力敏感; 孔隙结构; 毛管模型

本文引用格式

张睿,宁正福，杨峰，赵华伟，杜立红，廖新维 . 微观孔隙结构对页岩应力敏感影响的实验研究[J]. 天然气地球科学, 2014 , 25(8) : 1284 -1289 . DOI: 10.11764/j.issn.1672-1926.2014.08.1284

Abstract

The investigation of stress sensitivity is of primary importance during the life cycle of a shale gas reservoir.Pulse-decay permeability was measured for two shale samples in Niutitang Formation with increasing effective stres.The relationship between capillary radius and effective stress was obtained based on capillarity theory.The pore throat geometry and pore size distribution are further investigated by Scanning Electron Microscope (SEM) and nitrogen adsorption test.The results demonstrated that the exponential correlation fit the permeability stress curves well.Effective pore sizes will decrease dramatically under stress,which leads to a decrease (more than 80%) of effective permeability in shale.Further,once the strong stress is applied,only the large sized throats can be effectively retained.The small sized pores are more sensitive to the applied stress than the large one.It is probably because those micro-sized channels/pores will firstly close.As a result,the slot shaped nano-sized pores in shale reservoirs can lead to severe stress sensitivity according to the distorted characteristics,which favors the use of nitrogen adsorption method to verify capillary radius-pressure relation.

Key words： Shale; Stress sensitivity; Pore structure; Capillarity model

参考文献

［1］Zou Caineng,Li Jianzhong,Dong Dazhong, et al. Rich nanometer pore in shale gas reservoir is discovered in China for the first time[J].Petroleum Exploration and Development,2010,37(5):508-509.［邹才能,李建忠,董大忠,等.中国首次在页岩气储集层中发现丰富的纳米级孔隙[J].石油勘探与开发,2010,37(5):508-509.］
［2］Javadpour F,Fisher D,Unsworth M.Nanoscale gas flow in shale gas sediments[J].Journal of Canadian Petroleum Technology.2007,46(10):53-61.
［3］Chalmers G,Ross D,Bustin R.Geological controls on matrix permeability of Devonian Gas Shales in the Horn River and Liard Basins,northeastern British Columbia,Canada[J].International Journal of Coal Geology,2012,103:120-131.
［4］Bustin A,Bustin R,Cui X.Importance of Fabric on the Production of Gas Shales[C].Paper SPE 114167 presented at the SPE Unconventional Reservoir Conference,2008.
［5］Kwon O,Kronenberg A,Gangi A.Permeability of Wilcox shale and its effective pressure law[J].Journal of Geophysical research,2001,106:19339-19353.
［6］Guo Wei,Xiong Wei,Gao Shusheng.Experimental study on stress sensitivity of shale gas reservoirs[J].Special Oil and Gas Reservoirs,2012,19(1):95-97.［郭为,熊伟,高树生.页岩气藏应力敏感效应实验研究[J].特种油气藏,2012,19(1):95-97.］
［7］Reyes L,Osisanya S O.Empirical correlation of effective stress dependent shale rock properties[J].Journal of Canadian Petroleum Technology,2002,27(12):47-53.
［8］Mckee C,Bumb A,Koenlg R.Stress-dependent permeability and porosity of coal and other geologic formations[J].SPE Formation Evaluation,1988,3(1):81-91.
［9］Terzaghi.The Shearing Resistance of Saturated Soils and the Angle Between the Planes of Shear[C].Proceedings of the 1st International Conference of Soil Mechanics and Foundation Engineering.England:Cambrige,1936:54-56.
［10］Huang Yuanzhi,Wang Enzhi.Experimental study on coefficient of sensitiveness between percolation rate and effective pressure for low permeability rock[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(2):410-414.［黄远智,王恩志.低渗透岩石渗透率对有效应力敏感系数的试验研究[J].岩石力学与工程学报,2007,26(2):410-414.］
［11］Guo Ping,Deng Lei,Liu Qiguo, et al. Test and application of multiple stress sensitivity of low permeability gas reservoir[J].Journal of Southwest Petroleum University:Science & Technology Edition,2008,30(2):78-82.［郭平,邓垒,刘启国,等.低渗气藏多次应力敏感测试及应用[J].西南石油大学学报:自然科学版,2008,30(2):78-82.］
［12］Kang Yili,Zhang Hao,Chen Yijian, et al. Comprehensive research of tight sandstones gas reservoirs stress sensitivity in Daniudi Gasfield[J].Natural Gas Geoscience,2006,17(3):334-338.［康毅力,张浩,陈一健,等.鄂尔多斯盆地大牛地气田致密砂岩气层应力敏感性综合研究[J].天然气地球科学,2006,17(3):334-338.］
［13］Zheng Rongchen,Wang Xibin,Liu Chuanxi.The stress sensitivity test for dense reservoir rocks in low permeability gas pool [J].Xinjiang Petroleum Geology,2006,27(3):345-347.［郑荣臣,王昔彬,刘传喜.致密低渗气藏储集层应力敏感性试验[J].新疆石油地质,2006,27(3):345-347.］
［14］Luo Ruilan,Cheng Linsong,Li Xizhe, et al. The deformation characteristics of low permeability reservoir rocks under confining pressure[J].Natural Gas Industry,2009,29(9):46-49.［罗瑞兰,程林松,李熙喆,等.低渗透储层岩石覆压实验变形特征分析[J].天然气工业,2009,29(9):46-49.］
［15］Xue Yongchao,Cheng Linsong.Experimental comparison study on stress sensitivity of different permeability cores[J].Oil Drilling & Production Technology,2011,33(3):38-41.［薛永超,程林松.不同级别渗透率岩心应力敏感实验对比研究[J].石油钻采工艺,2011,33(3):38-41.］
［16］Yang Feng,Ning Zhengfu,Hu Changpeng, et al. Characterization of microscopic pore structure in shale reservoirs[J].Acta Petrolei Sinica,2013,34(2):301-311.［杨峰,宁正福,胡昌蓬,等.页岩储层微观孔隙结构特征[J].石油学报,2013,34(2):301-311.］
［17］He Jingang,Kang Yili,You Lijun, et al. Effects of mineral composition and microstructure on stress-sensitivity of mudrocks[J].Natural Gas Geoscience,2012,23(2):129-134.［何金钢,康毅力,游利军,等.矿物成分和微结构对泥质岩储层应力敏感性的影响[J].天然气地球科学,2012,23(2):129-134.］
［18］Tang Shuheng,Zhang Jingping,Wu Minjie.The pore structure characteristic about the apropelic coal[J].Natural Gas Geoscience,2013,24(2):247-251.［唐书恒,张静平,吴敏杰.腐泥煤孔隙结构特征研究[J].天然气地球科学,2013,24(2):247-251.］
［19］Yang Feng,Ning Zhengfu,Kong Detao, et al. Pore structure of shales from high pressure mercury injection and nitrogen adsorption methed[J].Natural Gas Geoscience,2013,24(3):450-455.［杨峰,宁正福,孔德涛,等.高压压汞法和氮气吸附法分析页岩孔隙结构[J].天然气地球科学,2013,24(3):450-455.］

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract

参考文献