WELLBOND® is a lost circulation remedy technology used with the OBM.
It consists of two components:
- WELLBOND® organic resin
- Calcium Chloride - cross-linking agent
When lost returns occurs:
- determine the thief zone
- mix WELLBOND® in a mixing tank
- set the drill pipe at the top of or opposite the loss zone
- pump the slurry through the drill pipes (no need to change the BHA)
- pump the buffer liquid (base oil) to prevent resin from contacting CaCl2 inside the pipes
- make sure the slurry and CaCl2 brine are displaced from the pipes
- close the rams, gently squeeze the slurry into the loss zone (50 psi maximum)
- hold the squeeze pressure 1-2 hours or until it dissipates
