Drillinggggggggggggggggggggggggggggggggggggg Mud.ppt

Drilling

4. Types of Drilling Fluids
water based,
solids
Polymer
Water-based PneumaticOil-based
Diesel based
Water,Chemicals
Dry air/gas
Mist
Foam
Aerated mud
Selection of the type of drilling fluid systems for a well is based on:
PERFORMANCE, ECONOMICS, and ENVIRONMENTAL CONSIDERATIONS
More than one system may be used in the same well.

7. 11

9. 2

12. 3

17. The ability to lift particles of various sizes
out of the hole is one of the most
important functions of a drilling fluid .
This is the only way that the rock which is
drilled or which sloughs from the wall is
carried out of the hole .
Hole Cleaning

20. Cooling and lubricating the
bit and drill string are done
automatically by the mud .
Cooling and lubricating

24. Hydrostatic pressure,
= mud weight, ppg x 0.052 x TVD psi

27. Carrying capacity is function of:
- Annular velocity
- Slip velocity
- Plastic viscosity
- Yield point

Carrying capacity

29. Remove Cuttings From the Remove Cuttings From the
WellboreWellbore
•The most important parameter is the Annular
Velocity (A.V.)
–Where possible the annular velocity should
be 100 ft/min, higher in deviated holes.
–In large hole sections the A.V. can be as
low as 20 ft/min.
–If the A.V. is insufficient to clean the hole
the viscosity must be increased
–For top hole high viscosities must be used
A.V.(ft/min)
=Pump rate (bbls/min)
Annular vol (bbls/ft)
Slip Velocity (ft/min)
= Cuttings velocity - A.V.