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Technical Paper: Innovative Conical Diamond Element Bits Drill Back-to-Back Tight Curves in One Run, Improving Economics While Reducing Risk in Avalon Shale Play, New Mexico

Society: SPE
Paper Number: 175534
Presentation Date: 2015
 Download: Innovative Conical Diamond Element Bits Drill Back-to-Back Tight Curves in One Run, Improving Economics While Reducing Risk in Avalon Shale Play, New Mexico (2.69 MB PDF) Login | Register

 

Abstract

An operator challenged drillbit providers to deliver fixed cutter bits that could drill high-dogleg curves and improve ROP in the Avalon shale play in Lea County, New Mexico. The heavily interbedded lithology is unpredictable and contains thick sections of limestone in some areas. The challenging transitional nature of the formations has caused major difficulties in achieving the planned 12°/100-ft build rate with conventional PDC bits and has resulted in slow ROP and potential reliability issues with roller cone hybrid bits. The operator wanted to maximize ROP and increase build rates to kick off the curve deeper in the lithology column to land the borehole in the precise location and to increase reservoir exposure in the lateral.

The service privider proposed using an 8 3/4-in conical diamond element (CDE) bit to achieve the high doglegs at a fast ROP, using a holistic design and simulation software to optimize the placement of the conical shape enables it to drill with significantly less torque compared with conventional PDC cutters. The reduces reactive torque fluctuations with the CDE bit when drilling directionally, enabling higher build rates with better toolface control to stay on target with fewer adjustments by the directional driller and to complete the curve in less time.

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