泥饼形成预测模型及影响因素分析

Prediction model of filter cake buildup and its influential factor

陈鹏¹ 王新海¹ 董樱花² 陈河青³ 陈爱军⁴

中国石油大学（北京）石油工程学院，北京 102249 中国石油塔里木油田公司塔北勘探开发项目经理部，新疆 库尔勒 841000 中国石油新疆油田公司勘探开发研究院，新疆 克拉玛依 834000 中国石油长庆油田公司第一采油技术服务处，陕西 西安 710021

在钻井完井过程中，工作液的滤失将会造成复杂的井下情况和油气层损害。泥饼的形成对井眼安全、快速钻进及储层保护起着重要作用。在分析泥饼形成机理的基础上，文中给出了预测泥饼厚度与工作液滤失量的数学模型，利用有限差分方法对模型进行了数值求解，实现了泥饼形成过程的数值模拟；同时，利用该模型分析了井眼与储层的压差、工作液固相质量分数、泥饼渗透率和环空流速对泥饼厚度及滤失速度的影响。研究认为：随着井眼与储层的压差、工作液中固相颗粒质量分数、泥饼渗透率的增加，泥饼厚度增大；随着环空流速的增加，泥饼厚度减小；在条件相同的情况下，随泥饼厚度的增加，工作液的滤失速度减小。

During drilling and completion, working fluid filtration will result in the complex downhole situation and formation damage, and filter cake buildup plays an important role in borehole security, rapid drilling and reservoir protection. Based on the analysis of filter cake buildup mechanism, this paper gives the mathematical model to predict the thickness of filter cake and the filtration rate of working fluid. Finite difference method is used for the numerical resolution of model, which realizes the numerical simulation of the process of filter cake buildup. At the same time, the model is used for analyzing the effect of differential pressure between borehole and reservoir, solid content of working fluid, permeability of filter cake and annular fluid velocity on the filter cake thickness and filtration rate. Study result shows that the filter cake thickness increases with the increase of differential pressure between borehole and reservoir, solid grain content of working fluid and permeability of filter cake. The filter cake thickness decreases with the increase of annular fluid velocity. Under the same conditions, the filtration rate of working fluid reduces with the increase of the filter cake thickness.

10.6056/dkyqt201204028