Development and service of drilling fluid

Presence of oil in Pereddobrudzhinsky deflection was proven back in the Soviet times. After the collapse of the Soviet Union, there have been numerous attempts to develop this perspective region. Several wells were drilled with further production from them. However, stable productivity was not achieved.
There were issues related to the complexity of the geological features of the field that are represented by a thick carbonaceous-sulfate layer. The traditional technology approved for DDD that involved the application of polymer-clay inhibited drilling muds turned out to ne inefficient.
The permeability of productive layers would decrease sharply after coming into contact with the water phase of the drilling mud.
The new owners of the license have dramatically changed their technological approach to the initial penetration of a producing horizon and have come to a conclusion in favor of the HC-based muds. Presumably, the absence of water contact will preserve the natural state of the reservoirs and the optimal conditions for a stable commercial inflow.
To implement such plans, our Company, on lease terms, provided the required amount of invert emulsion mud Witer II. The use of Witer II IEDM is planned during the opening of Devonian oil deposits in the range of 2200 - 2800 m. The replacement of water-based drilling mud in the well with the IEDM Witer II system will be carried out after the running of the Ø178 mm production string.



  • Density – 1,08 -1,10 g/cm3;
  • Funnel Viscosity – 35-80 s;
  • Gel – 20-60/30-80 dPa;
  • PV – 20-60 cP;
  • YP – 50-150 dPa;
  • Filtration (7 bar, oil filtrate) – ≤3 ml/30 min;
  • Electrostability – ≥250 V.