Question 2

[asadiqbal]

tell me one thing please when we drill suppose 12.25 inch bit ok we continously drilling and on the upper layers of rock mud cake forms....so when we pull out the bit could'nt be bit stuck?? bc the upper layer diameter become small than 12.25 suppose its become 12 in.....?? and we know mudcake is natural thing so how usually we get rid of these situations??

regards

[rpg1857]

Mud cake is not made of steel.During drilling it is dynamically removed and redeposited.So the hole dia will remain the same provided there is no wash out or plastic movement.Mud cake can cause problem when the well is in static condition