泡沫水泥稳定性研究  

A Study on Foam-Admixtured Oil Well Cement

作　　者：顾军[1] 尹会存 高德利[1] 王学良 周芝琴 

机构地区：[1]石油大学石油天然气工程学院,北京昌平102249 [2]中国石油大港石油集团公司滩海工程公司,天津大港300280 [3]中国石油吐哈石油勘探开发指挥部钻采工艺研究院,新疆哈密839009

出　　处：《油田化学》2004年第4期307-309,共3页Oilfield Chemistry

基　　金：国家自然科学基金重点项目"复杂条件下钻井技术基础研究"(编号50234030)专项资助。

摘　　要：讨论了液气界面张力和Laplace压力差对泡沫水泥稳定性的影响。定义置于内径3 5cm、高100cm量筒中的泡沫水泥浆体初凝时高度与初始高度之比为泡沫水泥稳定系数ψ,实验测定了泡沫水泥的稳定性。ψ>95%的泡沫水泥可用于固井施工。实验泡沫水泥由100∶25的G级油井水泥+漂珠、发气剂FCA+FCB(2 5%+1 0%)、稳泡剂FCF(2 5%)、缓凝剂FCR(1 1%)、增强剂FCP(1 0%)、水(75 0%)配成。密度0 809、0 979g/cm3的泡沫水泥,浆柱上、下部密度差分别为0 019、0 012g/cm3,ψ值分别为99%、100%。电镜照片显示实验泡沫水泥中气泡相互分离,细小,均匀,呈球状,结构稳定。用化学发气法制备的泡沫水泥在密度大于0 7g/L时结构是稳定的,密度小于0 7g/cm3时结构的稳定性取决于配方。图2表2参4。The influence of liquid-gas interfacial tension and Laplacean differential pressure on the stability of foam-admixtured oilwell cement (FAOWC) is discussed. The height ratio of preset and initial slurry in metric cylinder 3.5 cm in inner radium and 100 cm high is taken as stability factor, ψ_i, and used to characterize the stability of an experimental FAOWC, which is composed of oilwell cement of grade G+hollow silicate pearls, gas producing agents FCA+FCB(2.5%+1.0%), foam stabilizer FCF(2.5%)+set retarder FCR(1.1%), reinforcer FCP(1.0%), and water (75.0%). For FAOWC of density 0.809 and 0.929 g/cm^3, differences in density of upward and downward slurry in cylinder of 0.019 and 0.012 g/cm^3 are observed and ψ_i values of 99% and 100% are measured, respectively. EMS photos demostrate single homogeneously sized ball-like tiny bubbles in the experimental FAOWC showning its stabilized structure. The FAOWC prepared by the way of chemical gas generation has stable structure when its density >0.7 g/cm^3 and the stable FAOWC with density <0.7 g/cm^3 can be obtained through proper formulation.

关 键 词：泡沫水泥 稳定性研究 LAPLACE G级油井水泥 水泥稳定性 界面张力 稳定系数 水泥浆体 实验测定 固井施工 电镜照片 结构稳定 密度 压力差 发气剂 稳泡剂 缓凝剂 增强剂 气泡相 高度 

分 类 号：TE256.6[石油与天然气工程—油气井工程] TQ172.75[化学工程—水泥工业]