利用最小二乘法编程优选钻井液流变模式

在钻井过程中,钻井液的流变性影响钻速、泵压、排量、岩屑的携带与悬浮及固井质量等,直接关系到钻井的安全和成本,因此,控制钻井液的流变性是非常重要的。而在钻进现场,钻井液的流变行为可以符合幂律、宾汉、卡森和赫-巴等模式之一,这样就使钻井液流变模式的选择成为了现场生产中经常遇到的技术问题。究竟采用哪种流变模式,可以利用最小二乘法对试验数据进行拟合,并利用VB编制的相应计算程序来求得各常用流变模式与实际曲线的相关系数,从而优选出最适合的流变模式。该方法经实践检验,结果合理,使用方便。

In the drilling process,the rheology of drilling has an effect on the speed of drilling、pump pressure、output volume、carrying debris and floating and the quality of cementing. It is di-rectly related to the safety and cost of drilling. So it is one of the technical problemsin the field opteration to choose the drilling flu-id rheology model. These are four drilling fluid rheology models which are used usually. Using the least square method to fit the ex-perimental data and get the correlative factors between the often used models and practical curves by VB computer program, the best rheology model is chosen in this paper. The practical applica-tion show that thismethod isreasonable and convenient.