新型聚合物钾盐抑制泥页岩水化的性能与机理  

Performances of a novel potassium polymer on inhibiting shale hydration and the mechanisms

作　　者：邵正昌 伍连松 刘家才 王平全[2] 杜琨 任妍君 余永平 SHAO Zhengchang;WU Liansong;LIU Jiacai;WANG Pingquan;DU Kun;REN Yanjun;YU Yongping(Technical Monitoring Center of Zhongyuan Oilfield,Sinopec,Puyang 457001,Henan,China;College of Petroleum Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan,China;Chongqing Lihong Fine Chemical Co.,Ltd.,Chongqing 401336,China;Shenzhen Huineng Technology Co.,Ltd.,Shenzhen 518067,Guangdong,China)

机构地区：[1]中国石油化工股份有限公司中原油田分公司技术监测中心,河南濮阳457001 [2]西南石油大学石油与天然气工程学院,四川成都610500 [3]重庆力宏精细化工有限公司,重庆401336 [4]深圳慧能技术有限公司,广东深圳518067

出　　处：《化工进展》2020年第S01期225-231,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51974270)。

摘　　要：泥页岩水化膨胀是井壁失稳的重要原因。本文通过膨润土压片浸泡与线性膨胀实验、页岩钻屑滚动回收实验以及流变性、滤失性测试,评价了一种新型聚合物钾盐抑制剂聚阴离子纤维素钾(K-PAC)的抑制性能及其对水基钻井液流变性和滤失性的影响。评价结果表明,0.5%K-PAC的抑制泥页岩水化膨胀的性能明显优于5%KCl、2%聚醚胺-D230(PEA-D230),与0.5%聚丙烯酰胺钾盐(K-PAM)相近;0.5%K-PAC的增黏提切、降滤失性能要优于0.5%K-PAM。通过扫描电镜和X射线衍射分析了K-PAC的抑制机理,结果表明,K-PAC的阳离子部分(K+)能够进入膨润土晶层中并置换出水化钠离子,从而起到抑制黏土晶层膨胀的作用;K-PAC的阴离子部分吸附在黏土颗粒上起到护胶、降滤失的作用,二者协同增效,从而起到强抑制作用。由于K-PAC由聚阴离子纤维素和K+构成,对环境友好、成本低廉。因此,K-PAC具有成为低成本、环保型、强抑制性的水基钻井液抑制剂的巨大潜力。The hydration and swelling of shale is an important cause of wellbore instability.In this work,the inhibitive performance of a novel potassium polymer K-PAC and its influences on the rheological and filtration properties of a water-based drilling fluid were evaluated by the immersion test,linear swelling experiment,shale recovery test and rheological and filtration tests.Evaluation results showed that 0.5%K-PAC had a better inhibition property than 5%KCl and 2%poly(propylene glycol)bis(2-aminopropyl ether)(PEA-D230).Although the inhibitive performance of 0.5%K-PAC is similar with 0.5%potassium polyacrylamide(K-PAM),but its influences on the rheological and filtration properties of water-based drilling fluid are better than K-PAM.The inhibition mechanisms were studied by using Scanning Electron Microscopy and X-ray diffraction.K+from K-PAC could intercalate into the clay interlayers,followed by expelling water and minimizing the clay swelling.Polyanionic from K-PAC could adsorb on the clay surface,protecting the colloidal properties of drilling fluid and control the filtration loss.The synergistic effect between K+and Polyanionic in K-PAC could lead to a better inhibitive performance.K-PAC is composed of polyanionic cellulose and K+,environmentally friendly and low cost.Therefore,K-PAC has a great application potential in water-based drilling fluids which are a low-cost,environmental friendly and have excellent inhibitive performance.

关 键 词：井壁稳定性 泥页岩水化 聚合物钾盐 页岩抑制剂 吸附 滤失 

分 类 号：TH3[机械工程—机械制造及自动化]