ORIENTED BENT SUB

Operation method 

● After the bit and oriented sub are connected and screwed, measuring of the  angle between the nozzle of bit and oriented key of oriented bent sub shall be  done; 

● After run in drill tool, calculate out the azimuth of nozzle of bit according to the  azimuth of oriented key determined at a single point by drift indicator; 

● Change the nozzle of the bit into required azimuth, then lock in rotary and start  pump drilling to cut in; 

● During deflecting, using this approach that deflects while lightly pressing and  crowning the drill to help deflection; 

● After deflected for 2 to 3 meters, drill in 4 to 5 meters with light pressure and  slow rotation;  

●Repeat above mentioned operations for several times, when the angle of  deviation is up to the expected requirement deflecting in can be done smoothly by  reducing drill pressure and increasing rotation speed.