At present,the fracture pressure equivalent density pro-file is commonly used in mining sites as the upper limit of the safe density window for drilling fluids.Due to the fact that most well leaks occur when the formation is not fractured,this approach can easily mislead the use of drilling fluid density on site.The leakage pressure profile is a key reference data for the rational design and use of drilling fluid density.The calculation methods for leakage pressure of different types of leakage layers have been summa-rized,and a set of methods for determining leakage pressure pro-files has been developed.This method can effectively identify the type of well leakage,which is beneficial for selecting correspond-ing leakage pressure models and obtaining accurate leakage pres-sure profiles.
关键词
井漏/漏失压力/剖面/漏失类型/钻井液
Key words
Well leakage/Leakage pressure/Profile/Type of leak-age/Drilling fluid
维普
万方数据