A COMPLETE SET OF TECHNIQUES FOR PLUGGING MACROFRACTURE USING CLAY GRAIN WATER PLUGGING AGENT

On the basis of investigation and analysis of profile correction at home and abroad,this scientific research project is performed in the light of system engineering.To start with,we have a clear understanding of sedimentary facies and remaining oil distribution by reservoir description.Applying the techniques such as reservoir numerical simulation,history match and injection of tracer,the static and dynamic performances of formation are deepened.According to the systematic indoor experiments,a kind of cheap clay grain water plugging agent is obtained,the relevant optimum design method is established,the multi-slug double-fluid operation procedure suited for large dosage plugging macrofracture is determined,the water control technology using vertical electric pump is developed under the local conditions,the plugging results are evaluated scientifically and synthetically,and then a complete set of techniques for plugging macrofracture are took shape.The performance indices of clay and plugging mechanism are studied in the complete techniques.In the field applications of 341 wells,the obvious results are obtained with oil increment of 360 thousands tons.It provides a new way for improvememt of development results of high permeability oilfields.This paper introduces mainly the water control and stable oil production technology through plugging macrofracture in the 3th layer of S2 of 2th district in Shengtuo oilfield.