纳米二氧化硅对水基钻井液滤失影响预测模型及机理分析  

Prediction Model and Mechanism Analysis of Influence of Nano Silica on Filtration of Water-based Drilling Fluid

作　　者：崔国涛[1] 王梦忆 李全全 董嘉伟 郭力玮 果常旺 CUI Guo-tao;WANG Meng-yi;LI Quan-quan;DONG Jia-wei;GUO Li-wei;GUO Chang-wang(No.3 Gas Production Plant of Yanchang Gas Field of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Yan'an Shaanxi 717500,China;Xi'an Shiyou University,Xi'an Shaanxi 710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司延长气田采气三厂,陕西延安717500 [2]西安石油大学,陕西西安710065

出　　处：《当代化工》2023年第3期546-549,558,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金项目,苯基多环芳烃检测及其石油地球化学意义(项目编号:41972148);2018年校级青年科研创新团队建设经费,复杂油气藏流动机理与高效开发采油技术(项目编号:115080020)。

摘　　要：采用2级-2因子复合分析法,证明了纳米二氧化硅和膨润土加量对滤失量和泥饼厚度具有较大影响。同时考虑膨润土悬浮液的结构动力学和纳米颗粒的胶体行为,建立了新的添加纳米材料的钻井液滤失模型。通过Minitab数据软件对新滤失模型与API滤失模型进行对比分析,新模型标准误差为0.41~0.81cm^(3)、决定系数为99.3%~99.89%,具有较高可信度。将新模型预测数据与实验数据进行了对比,实验结果吻合良好。通过对泥饼进行X衍射分析和能谱分析发现,纳米二氧化硅影响滤失机理为纳米二氧化硅中的Si4+取代了泥饼中Fe2+、Mg2+等游离的阳离子,使得纳米二氧化硅颗粒进入泥饼微裂缝中,从而降低泥饼渗透率和滤失量。It was proved that the addition of nano silica and bentonite had a great influence on the filtration rate and mud cake thickness by using the 2-2 factor composite analysis method.Considering the structural dynamics of bentonite suspension and the colloidal behavior of nanoparticles,a new drilling fluid filtration model with nano materials was established.The new filtration model and API filtration model were compared and analyzed by Minitab data software.The standard error of the new model was 0.41~0.81 cm^(3) and the determination coefficient was 99.3%~99.89%.The predicted data of the new model were compared with the experimental data,and the experimental results were in good agreement.Through X-ray diffraction analysis and energy spectrum analysis of the mud cake,it was found that the filtration mechanism of nano silica was that si4+in nano silica replaced free cations such as Fe2+and Mg2+in the mud cake,making nano silica particles enter the micro cracks of the mud cake,so as to reduce the permeability and filtration of the mud cake.

关 键 词：钻井液 纳米二氧化硅 滤失模型 机理分析 

分 类 号：TE242[石油与天然气工程—油气井工程]