文档介绍：
钻井液流变模式计算及优选#
刘延鑫,王旱祥**
(中国石油大学(华东)机电工程学院,山东青岛
266580)
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摘要:钻井液流变参数的计算目前多使用线性最小二乘法方法求解,但是线性最小二乘法改
变了测量误差的统计特征,计算结果不具有方差最小的特点。针对 3 种非线性流变方程(幂
律模式、赫-巴模式和卡森模式)的特点,分别提出了最小二乘法的改进算法,该算法具有计
算速度快、无需设定初始值、无极小点陷阱的优点,与最小二乘法相比计算精度高,所得到
的流变参数估计具有拟合残差近似无偏性和方差几乎最小的优良统计特征。它可以应用到钻
井液流变参数的确定、钻井液流变模式的优选等方面。
关键词:钻井液;流变模式;最小二乘法;优选
中图分类号:
Calculation and Optimization of Drilling Fluid Rheology
Model
Liu Yanxin, Wang Hanxiang
(College of Electromechanical Engineering in China University of Petroleum,Qingdao 266580)
Abstract: The linear least squares estimation method was usually proposed on the basis of the
estimation problem of rheological parameter. But the statistic feature of measurement error
es different, and the result tends to be without the least variance. A new method of least
square method was proposed according to the characteristics of three nonlinear rheological
equations. This method possesses the advantage of speedy putation without assigning initial
value and no minimum point trap as well putational accuracy with rheology parameter
estimated near to fitting residual and little variance. It can be applied to the determination of
rheology parameter of drilling fluid, optimization of reheology model and so on.
Key words: drilling fluid; reheology model; least squares method; optimization
0 引言
钻井液的合理设计是钻探工作成功重要条件,目前常用的流变模