GEOSYNTHESIS ENGINEERING

Development and service of drilling fluid

Drilling of the second exploratory 5710 m deep well has begun at a new field. The well is directional with an S-shaped profile. Productive horizons will being drilled with the utilization of OBM «Witer II».
The first well at this field confirmed  the presence of industrially significant hydrocarbon deposits in the Upper Visean section after development.

INFORMATION ABOUT THE WELL.

CASING POLICY:
Casing Ø340 mm – 300 m;
Casing Ø245 mm – 2200 m; 
Casing Ø178 mm (vertically/along-hole) – 2200 – 4978/5028 m; 
Liner Ø114,3 mm (vertical/along-hole) – 4978/5028 – 5660/5710 m.

DRILLING FLUID TYPE: : 
Surface casing Ø340 mm – fresh-clay-drilling fluid; 
Intermediate Сasing Ø245 mm:
  humate-based drilling fluid – ≈ 300 – 973 m;
  NDDM ("non-dispersing drilling mud") – ≈ 973 – 2200 m;
Production casing Ø178 mm – OBM «Witer II»;
Liner Ø114mm – OBM «Witer II».


Well drilling term – 185 days.
Bottomhole temperature (5660 m) – 130 оС.

Drilling fluid density within the interval of 300-973 m – 1120-1160 kg/m3;
Drilling fluid density within the interval of 973-2200 m – 1100-1160 kg/m3;
Drilling fluid density within the interval of 2200-5028 m – 1160-1200 kg/m3;
Drilling fluid density within the interval of 5028-5710 m – 1180 kg/m3.