[+] Author and Article Information
Ankit Mirani

Petroleum Engineering, Well Engineering Research Center for Intelligent Automation, University of Houston, Houston, Texas 77004

G. Robello Samuel

Chief Technical Advisor and Technology Fellow, Halliburton, Houston, Texas

1Corresponding author.

ASME doi:10.1115/1.4037899 History: Received December 12, 2016; Revised June 01, 2017


Drill-bit vibrations and bit wear have been identified as the two major causes for premature PDC bit failure and difficulty in accurately predicting PDC bit performance. The objective of this paper is to present a new approach to drilling optimization by developing an algorithm that defines and generates a constrained stable rotary speed (RPM) - weight-on-bit (WOB) working domain for a given system as opposed to the traditional RPM-WOB charts. This study addresses the issues of dynamic-bit stability under torsional and lateral vibrations coupled with bit wear. The approach presented in this paper involves performing two separate analyses: vibration stability and bit-wear performance analysis. The optimum operating conditions are estimated at each depth of the drilling interval, taking into consideration the effect of bit wear and bit vibrations. Because the bit wears continuously while penetrating the rocks, discretization of depth is necessary for effective simulation. Vibration-stability analysis and bit-wear performance analysis are preformed separately at every sub-interval and then integrated over the discrete interval. For every sub-interval, a WOB-RPM domain is determined within which the given system is dynamically stable (for vibrations), and the bit wear does not exceed the maximum allowable wear (MAW) for the section of the drilling interval selected. A unique concept to relate the fractional change in hydro-mechanical specific energy to the fractional change in bit wear has also been put forward that further constraints the WOB-RPM stable working domain.

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