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To get the good idea on how good of the hole cleaning is, the another method called Cutting Carrying Index (CCI) is utilized. The CCI is an empirical relationship from real data and the equation is below:
Where;
AV is annular velocity in ft/min.
MW is mud weight in ppg.
K is a Power Law Constant.
The Power Law constant (K) can be calculated from the equation below:
Where;
PV is plastic viscosity in centipoises.
YP is yield point in lb/100sqft
n is flow behavior index.
The flow behavior index (n) can be determined by the following equation:
Where;
PV is plastic viscosity in centipoises.
YP is yield point in lb/100sqft
How will the CCI tell you about hole cleaning?
If CCI is equal to 0.5 or less, the hole cleaning is poor and the hole problem may be seen.
If CCI is equal to 1.0 or greater, it indicates that the hole cleaning is good.
Please follow the example to determine CCI.
Mud Weight = 9.2 ppg
Annular Velocity = 140 ft/min
Plastic viscosity = 17 cp
Yield Point = 15 lbs/100 sq ft
Determine “n”
n= 0.61472
Determine “K”
K = 353.71
CCI=(353.71(140)(9.2))/400,00
CCI = 1.14
From the given drilling parameters, the hole cleaning is excellent.
Reference books:
Drilling Fluid Books
Oilfield Resume – Discover The Secret of Writing Perfect Resume for Oilfield JobsDrillingFormulas.Com Stuck Pipe Book. Click Here !!!
{ 2 comments… read them below or add one }
Is this equation in vertical and directional wells, work well?
Work well with both vertical and deviated wells.