Slotted liner was runned in the interval 5680-5770m.
Drilling in lower production visean deposits with abnormally low formation pressure was performed with utilization clayless drilling mud Biocar® with density 1130kg/m3. This flushing system allowed to prevent fluid loss and provided high quality of pay zone opening.
PARAMETERS OF BIOCAR® DRILLING SYSTEM BEFORE LINER RUNNING:
- Density – 1,13 g/сm3;
- Funnel Viscosity – 64 s;
- Gel – 76/81 dPa;
- PV – 15 мПа*с,
- YP – 181 dPa,
- Filtration loss – 4,5 сm3/30 min;
- Mud Cake Friction Coefficient – 0,12;
- Salinity – 11%;
- Concentraion of KCl - 5-6%;
- рН – 7,5-8,5