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SYNTHETIC MICRO-COLMATANT

Micro-colmatants (plugging agents) are mostly used to improve the stability of boreholes drilled using water-based mud. Fine particles of mud seal micro-fractures, and prevent the penetration of filter cake into the structure of unstable clays and shales.

FUNCTIONS

A new synthetic colmatant (plugging agent) is a mixture of special water-soluble and oil-soluble polymers. Dependent on the base of the drilling fluid, some polymers dissolve completely, while some of them form aggregates varying from 5 to 800 micron. The aggregates form elastic membrane, which prevents penetration of filter cake deep into formation, thus strengthening the formation under the overbalance pressure conditions. In minimal underbalanced conditions this membrane is easily removed due to the absence of the inner filter cake. This additive may be used to drill the production interval with the minimal risk of reduction of permeability in the bottom-hole area.

SCOPE OF APPLICATION

  • it may be used in all types of water-based and oil-based mud systems.
  • it is highly efficient to reduce fluid loss in high pressure and high temperature conditions
  • the recommended concentrations may vary from 12 to 20 kg/m3 –dependent on the application conditions

it is compatible with production formation fluids and rocks, and it does not affect the recovery of permeability after drilling 

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SYNTHETIC MICRO-COLMATANT