Depth of washout
Method 1: The concept of this method is to pump plugging material to plug the wash out. We will know how many stroks pump till pressure increase then we can calculate back where the washout is.
Strokes pumped till pressure increase
Internal capacity of drill pipe
Pump output
Depth of washout
ft
Method 2: The concept of this method is to pump material that can be easily observed from drill pipe pass through wash out into annular and over the surface. We can calculate the depth of washout bases on the combination volume of internal drill pipe volu
Strokes pumped till material seen
Internal capacity of drill pipe
Annular capacity
Pump output
Volume from bell nipple to shale shakers
Depth of washout
ft