微观结构差异对碳酸盐岩酸蚀损伤的影响

doi:10.7657/XJPG20210209

新疆石油地质 ›› 2021, Vol. 42 ›› Issue (2): 188-193.doi: 10.7657/XJPG20210209

微观结构差异对碳酸盐岩酸蚀损伤的影响

李新勇¹(), 吴恒川²(), 房好青¹, 李永寿¹, 冒海军²^,³, 黄路云⁴

1.中国石化 a.西北油田分公司石油工程技术研究院;b.碳酸盐岩缝洞型油藏提高采收率重点实验室,乌鲁木齐 830011
2.西南科技大学土木工程与建筑学院,四川绵阳 621000
3.中国科学院武汉岩土力学研究所,武汉 430071
4.湖北工业大学土木建筑与环境学院,武汉 430068

收稿日期:2020-05-29 修回日期:2020-08-25 出版日期:2021-04-01 发布日期:2021-04-02
通讯作者: 吴恒川 E-mail:lixinyong.xbsj@sinopec.com;1281098155@qq.com
作者简介:李新勇（1972-）,男,新疆乌鲁木齐人,研究员,储层改造,（Tel）18997608181（E-mail） lixinyong.xbsj@sinopec.com
基金资助:
国家科技重大专项(2016ZX05014-005-003)

Influences of Microstructural Differences on Acid Corrosive Damage to Carbonate Rocks

LI Xinyong¹(), WU Hengchuan²(), FANG Haoqing¹, LI Yongshou¹, MAO Haijun²^,³, HUANG Luyun⁴

1. Sinopec, a.Research Institute of Petroleum Engineering Technology, Northwest Oilfield Company; b.Key Laboratory of Enhanced Oil Recovery for Carbonate Fracture-Cavity Reservoirs, Urumqi, Xinjiang 830011, China
2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621000, China
3. Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
4. School of Civil Construction and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China

Received:2020-05-29 Revised:2020-08-25 Online:2021-04-01 Published:2021-04-02
Contact: WU Hengchuan E-mail:lixinyong.xbsj@sinopec.com;1281098155@qq.com

摘要/Abstract

摘要：

为明确碳酸盐岩矿物成分、微观结构、分布形态等对酸岩反应速率、微观结构以及力学强度的影响,开展了酸岩反应速率实验、表面静态溶蚀实验以及点荷载力学强度实验。结果表明,在盐酸质量分数保持不变的条件下,灰岩与盐酸的反应速率与碳酸盐含量直接相关,碳酸盐含量越高,酸岩反应速率越快,反应越剧烈;由于灰岩裂隙区域基质与裂隙填充物矿物成分存在差异,基质与裂隙孔隙率相差较大,酸液会沿着裂隙方向侵蚀,形成沟槽,并且继续向裂隙深处扩展;灰岩基质破坏形态是裂缝在基质中开始发育,扩展至天然裂隙延伸,最后造成局部破坏;随着滴酸次数的增加,灰岩基质力学损伤系数大于裂隙区域力学损伤系数,灰岩基质由脆性向延性转化。

关键词: 碳酸盐岩, 酸岩反应, 微观结构差异, 损伤机理, 灰岩基质, 裂隙区域

Abstract:

Experiments on acid-rock reaction rate, surface static corrosion and point-load mechanical strength were carried out to investigate the influences of mineral composition, microstructure and distribution of carbonate rock on acid-rock reaction rate, microstructure and mechanical strength. The results show that, at a constant mass fraction of HCL, the reaction rate between limestone and HCL is directly related to the carbonate content. The higher the carbonate content is, the faster the acid-rock reaction rate and the more intense the reaction will be. Since there are differences in the mineral compositions between the matrix in the fracture zone and the fillings in the fractures, the porosity of the matrix is quite different from that of the fractures, so that acid would erode the mineral compositions along the fractures, resulting in grooves. The damages to the matrix of limestone by acid can induce fractures and extend to natural fractures, and consequently local damage occurs. With the increase of the times of acid dropping, the mechanical damage coefficient of the matrix in limestone would be greater than that of the fracture zone, and the limestone matrix transforms from brittle to ductile.

Key words: carbonate rock, acid-rock reaction, microstructural difference, damage mechanism, limestone matrix, fracture zone

中图分类号:

TE311

李新勇, 吴恒川, 房好青, 李永寿, 冒海军, 黄路云. 微观结构差异对碳酸盐岩酸蚀损伤的影响[J]. 新疆石油地质, 2021, 42(2): 188-193.

LI Xinyong, WU Hengchuan, FANG Haoqing, LI Yongshou, MAO Haijun, HUANG Luyun. Influences of Microstructural Differences on Acid Corrosive Damage to Carbonate Rocks[J]. Xinjiang Petroleum Geology, 2021, 42(2): 188-193.

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微观结构差异对碳酸盐岩酸蚀损伤的影响

Influences of Microstructural Differences on Acid Corrosive Damage to Carbonate Rocks

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