The drilling of directional well with a depth of 5,652 m was carried out using the pitless technology. During drilling-in of the main productive horizon within the interval 5580-5652 m, WITER-II invert-emulsion drilling mud was used. We finished the hole with a slotted liner Ø 127 mm. The effectiveness of such bottomhole design has been repeatedly confirmed. After lowering fluid level the well gave a high gas production rate.
This is the fourth well, where the Witer-II fluid system was used as a fluid for drilling-in and shows good results. The OBM Witer-II volume was provided to the Operator on a rental basis.
PARAMETERS OF OBM "WITER-II" BEFOR SLOTTED LINER RUNNING:
- Density – 1,14 g/сm3;
- Funnel Viscosity – 79 sec;
- Gel – 77/86 dPa;
- PV – 41 cP;
- YP – 158 dPa;
- Filter Loss – 2,5 ml/30 min;
- Electrostability - 742 V.