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固井水泥石三轴力学试验的试样制备方法 被引量:2

Sample preparation methods for triaxial mechanical test of cementing set cement
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摘要 固井水泥石力学性能直接关系到水泥环的长期密封效果。获取固井水泥石的力学性能参数主要通过三轴力学试验进行,有效制备试样对固井水泥石三轴力学试验研究乃至水泥环完整性分析至关重要。基于固井水泥石三轴力学试验试样的特殊性,设计探索了正方体水泥石养护成形后取心的正方体取心制样以及借助于模具一次养护成形制样等2种试样制备方法;研制了用于模具养护制样方法的Ø25.4 mm×50.8 mm小试样和Ø50.8 mm×101.6 mm大试样2套圆柱形水泥石养护模具;通过散点分布、均方根误差分析、标准差分析等对比研究了56组不同制样方法获取试样的力学试验数据,结果表明,小试样模具制样养护方法在数据可靠性、制样效率及成本等方面均优于其他方法,推荐作为固井水泥石三轴力学试验试样制备方法。 The mechanical property of cementing set cement has a direct influence on the long-term sealing effect of cement sheath.The mechanical property parameters of cementing set cement are measured mainly by means of triaxial mechanical test,and effective sample preparation is crucial to triaxial mechanical test study of cementing set cement and the integrity analysis of cement sheath.Considering the peculiarity of the samples for the triaxial mechanical test of cementing set cement,two sample preparation methods were designed and explored.One is prepared from the coring cube after the curing and shaping of cubic set cement,and the other is prepared through primary curing and shaping in a mould.Then,two sets of cylindrical set cement curing moulds used for mould curing based sample preparation method were developed,i.e.,small sampleØ25.4 mm×50.8 mm and large sampleØ50.8 mm×101.6 mm.Finally,56 sets of mechanical test data of the samples prepared using different methods were comparatively analyzed by virtue of scatter distribution,root-mean-square error(RMSE)analysis and standard deviation analysis.It is indicated that small sample mould based sample preparation and curing method is superior to the other methods in terms of data reliability,sample preparation efficiency and cost,so it is recommended to act as the sample preparation method for the triaxial mechanical test of cementing set cement.
作者 李勇 纪宏飞 白新平 刘子帅 LI Yong;JI Hongfei;BAI Xinping;LIU Zishuai(CNPC Engineering Technology R&D Company limited,Beijing 102206,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;CNPC Chuanqing Drilling Engineering Company Limited,Changqing Well Cementing Company,Xi’an 710018,Shaanxi,China)
出处 《石油钻采工艺》 CAS 北大核心 2020年第3期309-313,共5页 Oil Drilling & Production Technology
基金 国家科技重大专项“提高大型体积压裂条件下固井质量与井筒完整性新技术”(编号:2016ZX05022-005) 中国石油天然气集团有限公司重大工程专项“固井设计仿真监控系统升级与关键技术研发”(编号:2018E-2103)。
关键词 固井 水泥石 试样制备 三轴力学试验 cementing set cement sample preparation triaxial mechanical test
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