钻井液净化用离心机分离因数的选择

通过对钻井液中固相粒度分布、固相颗粒在离心力场中的沉降速度、固相分离所需的最小分离因数，以及分离因数与离心机分离中点的关系等方面的分析，探讨了离心机分离因数的选择。指出钻井液净化用螺旋卸料沉降离心机的主要任务是清除钻井液中2～74μm的无用固相；分离因数Fr是衡量离心机性能特征的一个重要指标，从离心机的维修费用、制造成本和使用寿命等方面综合考虑，在满足工艺的条件下，应尽量选用小的分离因数，即一般应使Fr≤1200；当Fr≤1200时，提高Fr会显著提高离心机的分离效果；Fr＞1200时，提高Fr对分离效果的影响较小。

Selection of separating factor of centrifuge for drilling fluid cleaning

Based on analysis of solids distribution, descending velocity of solids in centrifugal field, minimum seParating factor required, and the relationship between tLhe separating factor and the D50 cut point, the selection of Ihe separating factor of a centriler is investigated. It is pointed out that the separating factor Fr is an impotant index for appraising the performanc e of the centrifage, and Fr should be selected as minor as possibie, i. e. Fr≤1200; when Fr≤1200, enhancingFr will result in good separating effect; While Fr＞ 1200, separating effect is influenced by enhancing Fr only in a small degree.