基于CT扫描的致密砂岩渗流特征及应力敏感性研究

杨峰; 王昊; 黄波; 李晓倩; 张超; 肖春金; 李静

doi:10.12090/j.issn.1006-6616.2019.25.04.045

基于CT扫描的致密砂岩渗流特征及应力敏感性研究

doi: 10.12090/j.issn.1006-6616.2019.25.04.045

杨峰^1,,
王昊²,
黄波¹,
李晓倩¹,
张超¹,
肖春金¹,
李静^2, ,

1.
中国石化胜利油田分公司石油工程技术研究院, 山东东营 257200
2.
中国石油大学(华东)地质力学与工程研究所, 山东青岛 266580

基金项目:

国家科技重大专项 2016ZX05002-002

国家自然科学基金 41272141

详细信息

作者简介:
杨峰(1982-), 男, 硕士、高级工程师, 主要从事岩石力学与地球化学研究。E-mail:yangfengupc@163.com

通讯作者:
李静(1967-), 女, 博士、教授、博士生导师, 地质力学及油气储层预测。E-mail:lijing0681@163.com

中图分类号: TE319
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- 文章访问数: 233
- HTML全文浏览量: 60
- PDF下载量: 27
- 被引次数: 0
出版历程
- 收稿日期: 2018-09-14
- 修回日期: 2019-03-10
- 刊出日期: 2019-08-28

STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING

1.
Research Institute of Petroleum Engineering, Shengli Oil Field, SINOPEC, Dongying 257200, Shandong, China
2.
Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

摘要

摘要: 认识低渗透储层的渗流特征对油气开采和储层改造具有重要意义。为此，研究利用微CT扫描技术对致密砂岩岩样进行扫描，据此建立了能够精细刻画岩样的微观模型，运用COMSOL模拟了流体在岩石孔隙中的渗流特征，研究了致密砂岩的渗流特征及应力敏感性。研究结果表明：流体入口和出口间压差固定时，岩石的渗透率保持不变，与入口出口压力的具体数值无关；不同方向的岩石模型计算渗透率处在同一数量级但有微小差异；在侧向压力作用下，渗流路径变窄，通过渗流路径的整体速度下降，渗透率下降，但在孔隙相对较大的地方，由于路径变窄，流体速度较未加压力前略有上升。
- CT扫描 /
- 致密砂岩 /
- 微观渗流 /
- 数值模拟 /
- 应力敏感性
Abstract: The understanding of seepage characteristics of low-permeable reservoir is of great significant for oil and gas production and reservoir reconstruction. Therefore, the micro CT scanning technology was used to scan the tight sandstone samples so as to establish a microscopic model that can accurately reflect real structures of rock samples. COMSOL was used to simulate the seepage characteristics of fluid in the pores of rocks, and the seepage characteristics and stress sensitivity of tight sandstone were studied. The results show that:When the pressure difference between the inlet and outlet of the fluid is a constant value, the rock permeability remains unchanged and has no correlation with the specific value of the inlet and outlet pressure. The calculated permeability of rock models in different directions is in the same order of magnitude but slightly different. Under the action of lateral pressure, the flow path narrows, and the fluid overall velocity through the seepage path decreases, which leads to the decrease of permeability. However, where the pore is relatively large, the velocity rises slightly compared with that before the pressure is applied due to the narrowing of the path.
- CT scanning /
- tight sandstone /
- microscopic seepage /
- numerical simulation /
- stress sensitivity
注释:

责任编辑:范二平

HTML全文

图 1 岩石微观图像

Figure 1. Microimages of rocks

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图 2 XZ向模型速度

Figure 2. The velocity of the XZ model

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图 3 XZ向模型出口边界速度

Figure 3. Exit boundary velocity of the XZ model

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图 4 不同压差下的计算渗透率

Figure 4. The calculated permeabilities at different pressures

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图 5 50 MPa作用下XZ向模型应力图

Figure 5. The stress diagram of the XZ model under 50 MPa pressure

下载: 全尺寸图片幻灯片

图 6 不同侧向压力下的计算渗透率

Figure 6. The calculated permeabilities under different lateral pressures

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图 7 150°方向模型流速图像

Figure 7. The velocity images of the 150° direction model

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图 8 150°方向模型沿Y轴最大速度曲线

Figure 8. The maximum speed curves along the Y axis of the 150° direction model

下载: 全尺寸图片幻灯片

表 1 不同压力条件下XZ向模型的计算渗透率

Table 1. The calculated permeabilities of the XZ model under different pressures

入口压力/Pa	出口压力/Pa	压力差/Pa	出口处平均速度/(m/s)	计算渗透率/mD
100	0	100	4.63282×10^-8	0.474400343
200	100	100	4.63282×10^-8	0.474400343
300	200	100	4.63282×10^-8	0.474400343
100	0	100	4.63282×10^-8	0.474400343
1000	0	1000	4.63282×10^-7	0.474400343
1000000	0	1000000	4.61167×10^-4	0.472235032
5000000	0	5000000	2.29524×10^-3	0.47006424
10000000	0	10000000	4.56119×10^-3	0.467065696
15000000	0	15000000	6.79764×10^-3	0.464052534
20000000	0	20000000	9.01981×10^-3	0.461814133

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表 2 致密砂岩模型材料参数

Table 2. The material parameters of the tight sandstone model

	杨氏模量/GPa	泊松比	密度/(kg/m³)
基质区域	27	0.17	2500
孔隙区域	2.16	0	1000

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表 3 各方向上模型在不同侧向压力作用下的计算渗透率

Table 3. The calculated permeabilities of each side upward model under different lateral pressures

左边界压力/MPa	计算渗透率/mD
左边界压力/MPa	XZ向	30°	60°	90°	120°	150°	平均值
0	0.47440	0.36246	0.32044	0.40315	0.54939	0.30818	0.40229
10	0.47116	0.35908	0.31702	0.39926	0.54376	0.30558	0.39931
20	0.46690	0.35356	0.31433	0.39519	0.54117	0.30255	0.39562
30	0.46310	0.35052	0.31197	0.38923	0.53654	0.29966	0.39183
40	0.45930	0.34601	0.30895	0.38485	0.53255	0.29684	0.38808
50	0.45549	0.34206	0.30592	0.37891	0.52661	0.29506	0.38401

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参考文献(21)

[1]	冯建伟, 戴俊生, 刘美利.低渗透砂岩裂缝孔隙度、渗透率与应力场理论模型研究[J].地质力学学报, 2011, 17(4):303-311. doi: 10.3969/j.issn.1006-6616.2011.04.001 FENG Jianwei, DAI Junsheng, LIU Meili. Theoretical model about fracture porosity, permeability and stress field in the low-permeability sandstone[J]. Journal of Geomechanics, 2011, 17(4):303-311. (in Chinese with English abstract) doi: 10.3969/j.issn.1006-6616.2011.04.001
[2]	刘建军, 刘先贵.有效压力对低渗透多孔介质孔隙度、渗透率的影响[J].地质力学学报, 2001, 7(1):41-44. doi: 10.3969/j.issn.1006-6616.2001.01.005 LIU Jianjun, LIU Xiangui. The effect of effective pressure on porosity and permeability of low permeability porous media[J]. Journal of Geomechanics, 2001, 7(1):41-44. (in Chinese with English abstract) doi: 10.3969/j.issn.1006-6616.2001.01.005
[3]	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):335-338, 344. doi: 10.3969/j.issn.1672-1926.2006.03.011 KANG Yili, ZHANG Hao, CHEN Yijian, et al. Comprehensive research of tight sandstones gas reservoirs stress sensitivity in Daniudi gas field[J]. Natural Gas Geoscience, 2006, 17(3):335-338, 344. (in Chinese with English abstract) doi: 10.3969/j.issn.1672-1926.2006.03.011
[4]	张浩, 康毅力, 陈一健, 等.岩石组分和裂缝对致密砂岩应力敏感性影响[J].天然气工业, 2004, 24(7):55-57. doi: 10.3321/j.issn:1000-0976.2004.07.017 ZHANG Hao, KANG Yili, CHEN Yijian, et al. Influence of the rock components and fractures on tight sandstone stress sensitivity[J]. Natural Gas Industry, 2004, 24(7):55-57. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-0976.2004.07.017
[5]	游利军, 康毅力, 陈一健, 等.考虑裂缝和含水饱和度的致密砂岩应力敏感性[J].中国石油大学学报(自然科学版), 2006, 30(2):59-63. doi: 10.3321/j.issn:1000-5870.2006.02.013 YOU Lijun, KANG Yili, CHEN Yijian, et al. Stress sensitivity of fractured tight gas sands in consideration of fractures and water saturation[J]. Journal of China University of Petroleum, 2006, 30(2):59-63. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-5870.2006.02.013
[6]	游利军, 康毅力, 陈一健, 等.含水饱和度和有效应力对致密砂岩有效渗透率的影响[J].天然气工业, 2004, 24(12):105-107. doi: 10.3321/j.issn:1000-0976.2004.12.034 YOU Lijun, KANG Yili, CHEN Yijian, et al. Influence of water saturation and effective stress on effective permeability of tight sands[J]. Natural Gas Industry, 2004, 24(12):105-107. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-0976.2004.12.034
[7]	罗瑞兰, 程林松, 彭建春, 等.油气储层渗透率应力敏感性与启动压力梯度的关系[J].西南石油学院学报, 2005, 27(3):20-22. doi: 10.3863/j.issn.1674-5086.2005.03.007 LUO Ruilan, CHENG Linsong, PENG Jianchun, et al. The relationship between stress-sensitivity permeability and starting pressure gradient of reservoir[J]. Journal of Southwest Petroleum Institute, 2005, 27(3):20-22. (in Chinese with English abstract) doi: 10.3863/j.issn.1674-5086.2005.03.007
[8]	刘仁静, 刘慧卿, 张红玲, 等.低渗透储层应力敏感性及其对石油开发的影响[J].岩石力学与工程学报, 2011, 30(S1):2697-2702. http://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2011S1014.htm LIU Renjing, LIU Huiqing, ZHANG Hongling, et al. Study of stress sensitivity and its influence on oil development in low permeability reservoir[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(S1):2697-2702. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2011S1014.htm
[9]	张海勇, 何顺利, 栾国华, 等.超低渗透裂缝介质储层应力敏感性定量研究[J].岩石力学与工程学报, 2014, 33(S1):3349-3354. http://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2014S1106.htm ZHANG Haiyong, HE Shunli, LUAN Guohua, et al. Quantifative study of stress sensitivity in ultralow permeability fracture media reservoir[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S1):3349-3354. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2014S1106.htm
[10]	周汉国, 郭建春, 李静, 等.裂隙特征对岩石渗流特性的影响规律研究[J].地质力学学报, 2017, 23(4):531-539. doi: 10.3969/j.issn.1006-6616.2017.04.004 ZHOU Hanguo, GUO Jianchun, LI Jing, et al. A study on the influence rule of the fracture characteristics on rock seepage characteristics[J]. Journal of Geomechanics, 2017, 23(4):531-539. (in Chinese with English abstract) doi: 10.3969/j.issn.1006-6616.2017.04.004
[11]	闫国亮, 孙建孟, 刘学锋, 等.储层岩石微观孔隙结构特征及其对渗透率影响[J].测井技术, 2014, 38(1):28-32. http://d.old.wanfangdata.com.cn/Periodical/cjjs201401004 YAN Guoliang, SUN Jianmeng, LIU Xuefeng, et al. Characterization of microscopic pore structure of reservoir rock and its effect on permeability[J]. Well Logging Technology, 2014, 38(1):28-32. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/cjjs201401004
[12]	赵秀才, 姚军, 衣艳静, 等.基于择多算子的随机搜索法建立数字岩心的新技术[J].岩土力学, 2008, 29(5):1339-1344, 1350. doi: 10.3969/j.issn.1000-7598.2008.05.037 ZHAO Xiucai, YAO Jun, YI Yanjing, et al. A new method of constructing digital core utilizing stochastic search algorithm based on majority operator[J]. Rock and Soil Mechanics, 2008, 29(5):1339-1344, 1350. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2008.05.037
[13]	赵秀才, 姚军, 陶军, 等.基于模拟退火算法的数字岩心建模方法[J].高校应用数学学报A辑, 2007, 22(2):127-133. doi: 10.3969/j.issn.1000-4424.2007.02.001 ZHAO Xiucai, YAO Jun, TAO Jun, et al. A method of constructing digital core by simulated annealing algorithm[J]. Applied Mathematics A Journal of Chinese Universities Series A, 2007, 22(2):127-133. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-4424.2007.02.001
[14]	张思勤, 汪志明, 洪凯, 等.基于格子Boltzmann方法的3D数字岩心渗流特征分析[J].测井技术, 2016, 40(1):18-22. http://d.old.wanfangdata.com.cn/Periodical/cjjs201601003 ZHANG Siqin, WANG Zhiming, HONG Kai, et al. Analysis of seepage characteristics of 3D digital core based on Boltzmann method[J]. Well Logging Technology, 2016, 40(1):18-22. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/cjjs201601003
[15]	李静, 彭成乐, 周汉国, 等.基于显微红外光谱技术的岩石微观渗流特性研究[J].岩石力学与工程学报, 2017, 36(S1):3184-3191. LI Jing, PENG Chengle, ZHOU Hanguo, et al. Study on microscopic seepage characteristics of rock based on micro infrared spectra technology[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(S1):3184-3191. (in Chinese with English abstract)
[16]	崔利凯, 孙建孟, 闫伟超, 等.基于多分辨率图像融合的多尺度多组分数字岩心构建[J].吉林大学学报(地球科学版), 2017, 47(6):1904-1912. http://d.old.wanfangdata.com.cn/Periodical/cckjdxxb201706027 CUI Likai, SUN Jianmeng, YAN Weichao, et al. Construction of multi-scale and -component digital cores based on fusion of different resolution core images[J]. Journal of Jilin University (Earth Science Edition), 2017, 47(6):1904-1912. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/cckjdxxb201706027
[17]	王平全, 陶鹏, 刘建仪, 等.基于数字岩心的低渗透率储层微观渗流和电传导数值模拟[J].测井技术, 2017, 41(4):389-393. http://d.old.wanfangdata.com.cn/Periodical/cjjs201704002 WANG Pingquan, TAO Peng, LIU Jianyi, et al. Numerical simulation of micro seepage and electrical conduction in low-permeability reservoirs based on digital core[J]. Well Logging Technology, 2017, 41(4):389-393. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/cjjs201704002
[18]	曹廷宽, 刘成川, 曾焱, 等.基于CT扫描的低渗砂岩分形特征及孔渗参数预测[J].断块油气田, 2017, 24(5):657-661. http://d.old.wanfangdata.com.cn/Periodical/dkyqt201705013 CAO Tingkuan, LIU Chengchuan, ZENG Yan, et al. Fractal characteristic of low-permeability sandstone and physical parameters prediction based on CT scanning[J]. Fault-Block Oil & Gas Field, 2017, 24(5):657-661. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/dkyqt201705013
[19]	林承焰, 吴玉其, 任丽华, 等.数字岩心建模方法研究现状及展望[J].地球物理学进展, 2018, 33(2):679-689. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqwlxjz201802030 LIN Chengyan, WU Yuqi, REN Lihua, et al. Review of digital core modeling methods[J]. Progress in Geophysics, 2018, 33(2):679-689. (in Chinese with English abstract) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqwlxjz201802030
[20]	张浩, 康毅力, 陈一健, 等.致密砂岩油气储层岩石变形理论与应力敏感性[J].天然气地球科学, 2004, 15(5):482-486. doi: 10.3969/j.issn.1672-1926.2004.05.008 ZHANG Hao, KANG Yili, CHEN Yijian, et al. Deformation theory and stress sensitivity of tight sandstones reserviors[J]. Natural Gas Geoscience, 2004, 15(5):482-486. (in Chinese with English abstract) doi: 10.3969/j.issn.1672-1926.2004.05.008
[21]	李传亮.储层岩石的应力敏感性评价方法[J].大庆石油地质与开发, 2006, 25(1):40-42. doi: 10.3969/j.issn.1000-3754.2006.01.010 LI Chuanliang. Evaluation method for stress sensitivity of reservoir rock[J]. Petroleum Geology & Oilfield Development in Daqing, 2006, 25(1):40-42. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-3754.2006.01.010