长城钻井伊朗空气钻项目介绍.pptx

Airair-foam drilling in the Tabnak field IRANCNPC-Marketing- 2003Contents1.Introduction2.TBK Structure Characteristic and Technical Problems 3.Air/foam Drilling Technology 4.Solutions 5.Rig- site application 6.Achievement 7.Conclusion CNPC-Marketing- 20031. Project Introduction Tabnak gas field drilling project is a turnkey project ,from A to Z .Air and air-foam drilling technology applied to drill for 36 , 26, 171/2 12 ?” hole .To drill 19 wells and workover 2 wells 3 rigs operation within 2 yaersCNPC-Marketing- 20032. Structure Characteristic and Technical Problems TABNAKfieldTBK-2 -CNPC-Marketing- 2003 Surface FeaturesCNPC-Marketing- 2003Tabnak structure is an exposed anticline located in mountain area of the sub coastal Fars province, southern IRAN.The altitude about 1200m. The depth of target zones is of 3200-3500m.CNPC-Marketing- 2003Lithologic Characteristics (TBK-2)Lithology: prevailing limestonedolomite with shale gypsolyte interbedTarget:Carbonate, developed fracture with good connectivity above sea level (1200m)are dry without pore pressure.Above 2450m is salt water bearing formation, max. pressure gradient:0.85 MPa /100m，Below 2450m is gas reservoir,pressure gradient:0.75-0.91 MPa/100m CNPC-Marketing- 2003Lafan/KazhdumiSloughing Shales CNPC-Marketing- 2003The analyse report of lithologicAnalyse:Illite/Smectite/Kaolinite90%CNPC-Marketing- 2003DifficultiesDeveloped fracture with good connectivity.Low formation pressure gradient.: Above 2450m is shale salt water bearing/ formation, pressure gradient0.5-0.85 MPa /100m， Below 2450m is gas reservoir,pressure gradient:0.75-0.91 MPa/100mSevere lost circulation in Gachsaran, Jahrum, Dashtak formations. Cave-in problems caused Stuck-ins at Jahrum, Laffan and Dashtak formations.Considerable time lost due to cave-ins, losses and kicksCNPC-Marketing- 2003Complete Losses Gachsaran30“ shoeat 184m 20“ shoeat 115.5m AsmariTight Hole Losses Jahrum20“ shoeat 890m PabdehGurpiSloughing Shales Cave-in 13.375“ sh