砂粒运移对砾石充填层损害试验与数值模拟  

Experiments and numerical simulations of gravel packed layer damage due to sand migration

作　　者：李彦超[1,2] 李明忠[1] 王卫阳 王磊 

机构地区：[1]中国石油大学石油工程学院,山东青岛266580 [2]川庆钻探工程有限公司井下作业公司,四川成都610051 [3]中国海洋石油公司研究总院,北京100010

出　　处：《排灌机械工程学报》2014年第1期56-59,79,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家863计划项目(2006AA09Z351);国家科技重大专项课题资助项目(2011ZX05011-003)

摘　　要：为了研究储层砂粒运移、堵塞对砾石充填层损害造成的砾石充填防砂水平井产能的影响,采用室内驱替试验,应用实际油井出砂和充填砾石模拟了不同砾石与地层砂粒径比情况下,砂粒的运移对砾石充填层渗透率的损害规律及砾石充填层堵塞机理.结果表明:砂粒运移、侵入及堵塞导致砾石层渗透率发生明显变化,地层砂与砾石层接触面附近损害最为严重.根据砾石与地层砂粒径比及砂粒入侵程度不同,砾石层挡砂机理主要为地层砂未侵入、浅层桥接、深层桥接、孔隙充填和地层砂完全通过5种类型;根据试验结果,采用线性回归法建立了单位体积砾石层内地层砂堵塞量动态模型并数值仿真模拟软件,对砂粒在砾石充填层中的运移过程进行数值仿真模拟,模拟结果与试验结果基本一致.对定量评价地层砂颗粒运移对砾石层损害及油井产能预测有重要意义.As a sand control method,the gravel packing technique has been extensively applied in oil fields because of its merits,such as effective sand control effort and high well production. Naturally, reasonable explanation of its sand control mechanism and accurate prediction of well production are vital for this technique. Among many factors,sand migration is the main factor that influences the productivity of a gravel-packed well and the technique design. In order to have a better understanding on the mechanism of gravel packed layer damage caused from sand migration and plugging and to provide a theoretical basis for well productivity prediction,the damage of gravel layer permeability,which was due to sand migration,was simulated experimentally in laboratory under different gravel-sand diameter ratios that were decided according to the reservoir characteristics of sanding in an oil field and the specific sand control technique. The results show that the migration,invasion,and bridge plug of sand particles can lead to a significant change in the permeability of gravel layer; especially the damage near the interface between formation sand and gravel layer is the most serious. According to gravel-sand diameter ratio and sand intrusion degree,there are five types of mechanism for gravel blocking sand. A dynamic mathematics model is established by linear regression to predict the plug amount of formation sand per unit volume of gravel layer,and a numerical simulation is launched to simulate the experiment. The simulated results are in agreement with experimental data,suggesting the model has significance in quantitative evaluation of the damage on gravel layer caused from the migration of formation sand particles and well productivity prediction.

关 键 词：砂粒运移 出砂 砾石充填 数值模拟 渗透率 

分 类 号：TE358.1[石油与天然气工程—油气田开发工程]