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MEX-BLOCK

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.

SCOPE OF APPLICATION

  • 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

ADVANTAGES

  • reduction of intensive losses of kill fluids during workover operations
  • mixing in the field conditions
  • ability to adjust the composition and to provide optimal combinations of plugging agents (colmatants) based on the data related to formation permeability or to bottom-hole filter
  • prevention of pay zone contamination when killing the well

LIMITATIONS/ SPECIAL FEATURES

  • additional treatment with thermal stabilizers is recommended to maintain mud efficiency at temperatures above 100 оС
  • high concentrations of calcium chloride may be required to maintain proper mud parameters in calcium chloride drilling fluids
  • 21 october, 2015

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MEX-BLOCK