The well is inclined, S-shaped. The inclination starts at 1000 m in the Jurassic deposit zone. To prevent loss of stability of the well walls, the NDDM ("non-dispersing drilling mud") is going to be used while drilling this interval as it was used on a previous well.
After Ø245mm casing, well will be transfered to OBM Witer II
INFORMATION ABOUT THE WELL.
CASING POLICY:
Casing Ø340 mm – 275 m;
Casing Ø245 mm (vertical/along-hole) – 2800/2865 m;
Casing Ø178 mm (vertically/along-hole) – 5600/5665 m;
Liner Ø114,3 mm (vertical/along-hole) – 5500/5565 – 5750/5815 m.
DRILLING FLUID TYPE: :
Surface casing Ø340 mm – fresh-clay-drilling fluid;
Intermediate Сasing Ø245 mm:
humate-based drilling fluid – ≈ 275 – 850 m;
NDDM ("non-dispersing drilling mud") – ≈ 850 – 2800/2865 m;
Production casing Ø178 mm – OBM «Witer II»;
Liner Ø114mm – OBM «Witer II».
Well drilling term – 165 days.
Bottomhole temperature (5750 m) – 144 оС.
Drilling fluid density within the interval of 275-2865 m – 1120-1180 kg/m3;
Drilling fluid density within the interval of 2865-5665 m – 1180-1220 kg/m3; from ≈5000 m – 1320 kg/m3;
Drilling fluid density within the interval of 5665-5815 m – 1390-1470 kg/m3.
