LIMEX system is a fresh water-based mud with lime (calcic) content. The system composition and properties may vary dependent on the use conditions. The system is designed with respect to the use of lime-based drilling fluids in the Ural-Volga region, Komi Republic, and when drilling deep exploration wells.


LIMEX system is optimal:

  • to drill deviation wells in the Urals-Volga Region;
  • to drill deep exploration wells in the areas with abnormally high formation pressures.


Dependent on the conditions, the LIMEX mud system may provide different advantages.

When drilling exploration wells in the conditions with abnormally high formation pressures, the system can provide appropriate rheological properties in the environment with very high content of solids (including weighting agent). The system includes temperature resistant additives, which do not destruct in high temperature conditions, and which provide stability of filtration and stability of rheological properties.

The composition of the system can be optimized to improve gel strength properties when drilling wells in the Urals-Volga region. This system is characterized with thixotropic properties, with optimal content of the fine mud solids (due to the absence of the mud volume build-up), and with the use of calcium carbonate as a colmatant and weighting agent.

The use of modified composition of the lime-based mud provides the following unique properties:

  • formation of  stagnant zones in washout areas characterized with high gel strength values, allowing to suspend small cuttings from sloughing;
  • high quality of borehole cleaning from cuttings;
  • formation of hard mud cake preventing mud loss in high-permeability intervals;
  • self-recovery from low-intensive mud losses/ fluid losses.

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