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MULTIBUR in OJSC Surgutneftegaz
12.12.2012

In November 2012 during well construction No. 49Gr of Ay-Pimsky field on the oil-and-gas production department Nijnesortymskneft object OJSC Surgutneftegaz drilling of interval 1,625-3,177 m was made using water based gel-emulsive mud MULTIBUR. This interval represented directional section with inclination angle 57-81 degree having problem podachimovskie clays.

During well construction through podachimovskie clays the main problem is instability of wellbore walls which can lead to failures, stickings, induced reaming and excluding of casing especially at big inclination angles.

This problem was successfully solved by using water based gel-emulsive mud MULTIBUR.

While drilling were achieved the following results:

  • Accident free podachimovskie clays interval passing.
  • Absence of reaming.
  • Achievement of hole target.
  • Successful production casing running.

Parameter (API)

Value

Density, g/cm3

1.35

Relative viscosity, s

65

Filtration rate, ml/30min

0.7

HPHT filtration (T=90°C, ΔP=500 psi), ml/30min

3

Plastic viscosity, cP

39

Yield point, lbs/100ft2

30

Gel strength, lbs/100ft2

6 / 12

pH

8


All conducted works were made in standard working mode without landings and overpulls, average ROP was 29,8 m/h casing running 168 mm and cementing were provided in normal mode.

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