摘要
在石油天然气勘探开发钻井过程中，钻井液流变参数对机械钻速及井眼净化和地面固相清除效果起着十分重要的作用。粘切偏低，容易引起井眼净化不良、井内钻井液自然分层和不能悬浮加重剂等复杂情况；粘切偏高，又会增大地面除砂难度、降低钻井速度、引起粘附卡钻等。为此，论述了常用钻井液剪切应力随其剪切速率的变化规律，选取范氏粘度计的６个剪切速率及其对应测定值为研究对象，借助计算机，统计归纳出钻井液流变参数计算新方法。分析结果表明：它比滨汉、指数和卡森三种模型的线性关系好，在各剪切速率下用它描述的剪切应力最接近实际。该方法计算简便，且不受钻井液体系变化的影响，是目前切实可靠的分析方法。
Based on the variation law between the shear stress and the shear rate of ordinary drilling fluid, through the research of 6 data of shear rate and their corresponding measured values of Fann viscometer; with the help of computer, a new calculation method for rheological parameter of drilling fluid is conduced. The linear relation of this method is better than that of Bingham, index and Casson model, and the shear stress got by this method is most close to the actual values. This method is simple and won't be affected by the change of drilling fluid, so it's the most reliable analytical method at present.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1996年第5期41-45,共5页
Natural Gas Industry
关键词
钻井液
流变性
模型
计算方法
Drilling fluid, Rheology,Model,Parameter,Calculation method.
