Visean production deposits were cased in the interval 4110-5628 m.
Drilling in interval was performed with utilization of clayless drilling mud system Biocar MT®.
The next step is drilling in lower production of Visean deposits with abnormally low formation pressure.
The penetration of production zones will be carried with utilization of clayless drilling mud Biocar with density 1120 kg/m3. The changing of drilling mud system will be implemented after WOC.
PARAMETERS OF BIOCAR-МТ® DRILLING FLUIDE BEFORE CASING RUNNUNG:
- Density– 1,23 g/сm3;
- Funnel Viscosity – 70 s
- Gel – 76/81 dPа;
- PV – 21 mPa*s,
- YP – 186 dPa,
- Filtration loss – 3 сm3/30 min;
- Mud Cake Friction Coefficient – 0,12;
- Salinity – 12,5%;
- Concentration of KCl - 6-7%;
- рН – 8,0-9,0
