MEX-BLOCK is a mud system designed for well maintenance and for workover. MEX-BLOCK is an optimized mixture of polymers and acid-soluble plugging agents (colmatants), which enables to prepare appropriate mud compositions without any special equipment on the drilling site. This mud system prevents losses of killing fluids, it also prevents contamination of the bottom-hole area and enables to promptly place the well into operation after workover.


  • well maintenance or workover
  • perforation 
  • killing several pay intervals characterized with different formation pressures 
  • killing wells after frac job when the bottom hole area is characterized with high permeability 
  • completion and workover in horizontal wells equipped with slotted bottom-hole filters