水泥浆静液柱压力评价实验方法研究  

A New Method to Evaluate the Hydrostatic Pressure of Cement Slurries

作　　者：朱海金 刘爱萍 安少辉 许加星 

机构地区：[1]天津中油渤星工程科技有限公司,天津塘沽300451

出　　处：《油田化学》2012年第3期353-356,374,共5页Oilfield Chemistry

基　　金：中国石油天然气集团公司项目"乌兹别克斯坦费尔甘纳盆地深井超深井钻井技术攻关及现场试验"部分研究成果(项目编号2008E-1607)

摘　　要：有效评价水泥浆静液柱压力变化对于进行水泥浆防窜研究非常关键。通过规范失重和静胶凝强度实验方法,提出了一种水泥浆静液柱压力变化评价实验方法。选用两类降失水剂水泥浆作为基准水泥浆,①成膜共聚物水泥浆:嘉华G级水泥100 g+水44 g+G60S降失水剂1.6 g+CF40S分散剂0.3 g,②AMPS共聚物水泥浆:嘉华G级水泥100 g+水41 g+BXF-200L降失水剂3 g。用水泥浆失重仪测试时,2种水泥浆的液柱压力均随候凝时间的延长而降低;用静胶凝强度分析仪测试时,2种水泥浆的静胶凝强度均随候凝时间的延长而增大。将失重仪测量值通过公式换算得到的静胶凝强度与静胶凝强度分析仪测量值比较,在水泥浆液态性较强的时候比较接近,之后随着水泥浆候凝时间的延长,差距逐渐拉大。结合有效应力原理对两种实验结果的差别进行了解释。用静胶凝强度分析仪测试水泥浆静液柱压力的方法更准确。研究结果表明,该方法重现性及可操作性良好,为防窜方法方面的研究提供一定的理论基础。Effective evaluation of cement hydrostatic column pressure was critical for the research of cement anti-gas migration. By standardizing methods of measuring cement slurries＇ static gel strength and weight loss, a new method to evaluate cement hydrostatic column pressure was presented. Cement slurries with two types of fluid loss controller were chosen. The formula of film-forming copolymer slurry was： 100 g G cement, 44 g water, 1.6 g G60S fluid loss controller, 0.3 g CF40S dispersant, and that of AMPS copolymer slurry was： 100 g G cement, 44 g water, 3 g BXF-200L fluid loss controller. When measured by pressure-drop instrument （ PDI）, the hydrostatic column pressure of two kinds of cement slurry decreased with increasing waiting time. However, when the test instrument was the static measured measured changed to static gel strength analyzer （SGSA）, gel strength （SGS） of two kinds of cement slurry increased with increasing waiting time. The value by PDI was converted to SGS by the formula presented by Sabins, and was compared with the value by SGSA. It was found that these two values were close to each other when the cement slurry was in liquid, and after this, the difference increased with increasing waiting time. The differences of these test results obtained were discussed and explained with effective stress principle. The result measured by SGSA was more accurate. The repeatability and operability of this evaluation method were good, which could do some work for the study of gas migration of cementing technology.

关 键 词：固井 水泥浆 液柱压力 静胶凝强度 失重法 

分 类 号：TE256.7[石油与天然气工程—油气井工程]