Intrusion Mechanism of Seepage Water on the Cement Slurry During Setting Process
LIU Kaiqiang1,*, YU Junjie1, WANG Haiping3, ZHANG Xiayu2, JIN Cheng1, ZHANG Xingguo2
1 School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China 2 National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China 3 Petrochina Chuanqing Drilling Engineering Co., Ltd., Changqing Well Reinforcement, Xi’an 710018, China
Abstract: There are two major problems inthe cementing engineering of the adjustment wells under seepage water intrusion, the first, in engineer, water intrusion reduces the zone isolation quality of hardened cement-sheath and oilfield development benefit, the second, in science, the intrusion mechanism of the seepage water on the cement slurry during setting process is unclear. Aiming to these, this work established a testing device for seepage water intrusion during cement slurry setting process to record the electrical conductivity of exudate water and bonding state between cement slurry and rock core interface, Low-field NMR and electrical methods were applied to measure the pore size distribution and pore connectivity of the cement slurry during setting process. And then, the intrusion mechanism of the seepage water on the cement slurry during setting process was analyzed. Experimental results showed that the seepage water destroyed the interface bond between hardened cement slurry and rock core to form a gap with 1—2 mm wideth. On the electrical conductivity of the seepage water, because the rapid dissolution of ions in cement slurry into exudate water from 2.5 h to 5.5 h of setting time, the exudate water’s electrical conductivity increased from 261.44 μS/cm to 429.30 μS/cm, increased by 312.0% compared with the water before INFILTRATION. During setting process, the microstructureof cement slurry developed from “dispersed particle structure” to “gel network structure”, which caused pore hydrostatic pressure to drop rapidly to zero within hours. With a hydrated time of 10 h, a large number of connected pores existed and the pore connectivity was 0.59—0.67 in the cement slurry, which was highly susceptible to seepage water intruding to replace its pore solution. Based on “dissolution-nucleation-precipitation” hydration theory, the hydration degree and designed properties of the cement slurry were destroyed. And then decreased the zone isolation quality of hardened cement-sheath and cementing quality.
通讯作者:
* 刘开强,博士,副教授。2021年6月—2023年10月,中国建筑材料科学研究总院,博士后;2020年6月毕业于西南石油大学,获得材料化学工程博士学位;2018年12月—2019年12月赴Monash University公派联合培养。主要从事固井功能材料等方向科研与教学工作,主持国家自然科学基金青年项目、国家重点实验室开发基金和企业合作项目10余项,以第一作者或通讯作者在Composites Part B: Engineering、Cement & Concrete Composites、Construction and Building Materials、Applied Surface Science、Journal of Building Engineering、《石油学报》《油田化学》等国内外学术期刊上发表论文30余篇。 kaiqiangliu@swpu.edu.cn
引用本文:
刘开强, 于骏杰, 王海平, 张夏雨, 金诚, 张兴国. 地层渗流水对凝固过程固井水泥浆的侵扰机理[J]. 材料导报, 2024, 38(24): 23070062-6.
LIU Kaiqiang, YU Junjie, WANG Haiping, ZHANG Xiayu, JIN Cheng, ZHANG Xingguo. Intrusion Mechanism of Seepage Water on the Cement Slurry During Setting Process. Materials Reports, 2024, 38(24): 23070062-6.
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2024, Vol. 38 
