Lithologic Characteristics in Yanqi Basin and the Drilling Technical Measures

The geologic conditions in Yanqi Basin are complexand the drilling progress has to meet the requirements ofhigh development rate. Many valuable experience aregained and a series of drilling technologies that aresuitable for the geologic conditions in Yanqi Basin aredeveloped in drilling practiee.The average penetration rateincreases from 3.42m/h in 1994 to 5.94m/h in 1997, a42.42% improvement. This pape sums up the experienceand lessons gained in Yanqi Basin and is focused on thetechnical parameters and measures for safely and rapidlydrilling.The technical measures outlined in this paper havecertain directive significances for drilling operation in thisarea and also can be used as references in similal areas.