The well is inclined with an S-shaped profile. The angle set interval begins in the Jurassic deposit zone at a depth of 1000 m. To prevent loss of stability of the well walls during drilling of this interval, it is planned to use NDDM ("non-dispersing drilling mud").
When the technical column Ø245 mm would be set, the solution in the well will be replaced by hydrocarbon flushing fluid IER Witer II. We expect that the utilization of IER Witer II will achieve high stability of the well and will provide high quality of the primary opening productive formations .
INFORMATION ABOUT THE WELL
CASING POLICY:
Casing Ø340 mm – 310 m;
Casing Ø245 mm (vertical/along-hole) – 2790/2833 m;
Casing Ø178 mm (vertically/along-hole) – 5140/5212 m;
Liner Ø127 mm (vertical/along-hole) – 5040/5112 – 5477/5549 m.
DRILLING FLUID TYPE: :
Surface casing Ø340 mm – fresh-clay-drilling fluid;
Intermediate Сasing Ø245 mm – OBM «Witer-II»;
humate-based drilling fluid – ≈ 310 – 845 m;
NDDM ("non-dispersing drilling mud") – ≈ 845 – 2790/2833 m;
Production casing Ø178 mm – OBM «Witer-II»;
Liner Ø127 mm – OBM «Witer-II».
Well drilling term – 150 days.
Bottomhole temperature (5477 m) – 131 оС.
Drilling fluid density within the interval of 310-2833 m – 1120-1160 kg/m3;
Drilling fluid density within the interval of 2833-5212 m – 1190-1210 kg/m3;
Drilling fluid density within the interval of 5212-5549 m – 1220 kg/m3.
