Griffiths天然裂缝宽度预测模型研究与分析  

STUDY ON MODEL PREDICITION WIDTH OF GRIFFITHS NATURAL FRACTURE

作　　者：赵洋 邓明毅[1,2] 曾文强 肖洛书[3] 

机构地区：[1]油气藏地质及开发工程国家重点实验室 [2]西南石油大学 [3]中国石油集团川庆钻探工程有限公司安全环保质量监督检测研究院

出　　处：《钻采工艺》2017年第5期102-105,共4页Drilling & Production Technology

基　　金：国家青年科学基金项目课题"裂缝性漏失桥接堵漏颗粒动力学细观模拟研究"(编号:51604237)资助

摘　　要：由于Lietard图版法在计算上复杂、速度慢、叠加方法在现场应用有一定的困难,产生误差较大,为了更准确地估算井漏时的天然裂缝宽度,利用Griffiths方法的基础上作了改进,对比其它两种方法,给堵漏作业提供现场决策依据,最后运用VB程序语言对其数值解法进行编程及研究,并与现场测井数据进行对比。研究模型时发现,Griffiths、F.Sanfillippo和Verga三种方法所计算出的裂缝宽度相差不大,在现场中可以此三种方法算出的裂缝宽度取平均作为裂缝的估算宽度。研究结果表明,Griffiths算法相比较Lietard图版法无论求解速度及现场的适用性上都得到了明显的提高;漏失时间、钻井液黏度和井内压差等因素都会对裂缝宽度产生影响。Computation by Lietard chart is complex and slow,and its superposition method is difficult to use on site,resulting in large errors. In order to more accurately estimate the width of natural fracture at the time of lost circulation,on basis of Griffiths method,some improvements were made. And by comparing its results with other two methods,measures for lost circulation control were decided. Finally,its numerical method for solution was programmed and studied using VB language,the solution was compared with the logging data on site. Fracture widths calculated by Griffiths,F. Sanfillippo and Verga were similar,so the average fracture width calculated by the three methods could be used as the estimated fracture width in the field. The research results show that compared with the Lietard chart method,both the computational speed and field applicability of Griffiths method are significantly improved. And lost circulation time,viscosity of drilling fluid,and differential pressure in the well will have an impact on the fracture width.

关 键 词：裂缝性漏失 天然裂缝宽度 求解模型 

分 类 号：TE28[石油与天然气工程—油气井工程]