Steady squeeze fracturing fluid plugging: When the oil fracturing proppant pump pressure surge, decreased emissions, identified as sand plug, they should immediately stop sand, smooth extrusion process with a large displacement fracturing fluid were plugging, to be normal again continue adding sand;
Backwash plugging: plugging sand appears, immediately stop sand backwash, after all the grit out of the column inside, try sand, continue fracturing;
Water hammer plugging: plugging water hammer is a small part of fracturing car in a safe pressure range, positive pressure - from the tubing, then shoved to put pressure, to form a water hammer phenomenon, generating shock and vibration. After a positive impact and anti-vibration reciprocating action, shock or vibration to live segment lifted grit sand plug.
Events column oil well fracking backwash plugging: This method is the active column and backwash well combined to lift the sand plug. Sand plug in more serious cases, the rapid activity fracturing string, the grit oil jacket annular space is released. Then, and then backwashing or water hammer Solving tubing grit.