Drilling and Completion
Optimizing ROP in Formations Difficult to be Drilled
In Northern Germany drilling engineers encounter the problem of low rates of progress (ROP) while drilling
in the geological formations middle and lower Bunter and Keuper. The ROP is quite low in comparison
to other regions, e.g. the North Sea.
The performance date of more than 100 wells that were drilled in Northern Germany during the last 10
years were studied by statistical methods. The data under investigation comprise more than 1,000 bit
runs.
The results of the data analysis were used to set up a prognosis with respect to the potential to improve
drilling performance in the target horizons by combining improved drilling bits, more powerful downhole
motors, and increased bit hydraulics.
For the two Bunter formations a special impregnated drilling bit was conceived, applied, and improved
with noticeable success.
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