Patent ID: 8510081
Filing Date: 2013-08-13
Classification: E21B

Abstract:
1. A method of evaluating drilling performance in a wellbore, which comprises: monitoring, during wellbore drilling, an actual toolface orientation of a downhole steerable motor by monitoring a drilling operation parameter indicative of a difference between the actual toolface orientation and a toolface advisory; recording, at a plurality of times during the wellbore drilling, the difference between the actual toolface orientation and the toolface advisory; scoring each of the differences between the actual toolface orientation and the toolface advisory by assigning respective values to the differences, each of the values representing drilling performance at the corresponding time at which the corresponding difference was recorded, each of the values depending on the corresponding difference; generating a total score, the total score being based on a sum of the values, the total score indicating the degree to which the actual toolface orientation was kept in a correct orientation over the plurality of times during the wellbore drilling; and providing at least the total score to an evaluator.