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Technical Paper: First Application of Turbodrill and Hybrid Bit to Optimize Drilling Times in Cretaceous Formations with High Chert Content in Mexico South Region

Society: SPE
Paper Number: 167921
Presentation Date: 2014
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Abstract

This paper highlights the design, execution, and evaluation of the first application of turbodrill and hybrid bit to drill cretaceous formations with up to 40% chert content in Mexico south region. The complex cretaceous formations in Terra field presents many drilling challenges: mud losses, gas influxes, the formation is hard [Unconfined Compressive Strength (UCS) 15 - 30 ksi] and abrasive, it is difficult to build inclination, low rate of penetration (ROP) requiring many runs of 8 1/2-in tungsten carbide insert (TCI) bits.

The goal of the application of a new drilling system was to reduce the need to trip for TCI bits drilling hours limitations and optimize flat times; reduce rotary steerable system (RSS) failures; deliver a wellbore with minimal tortuosity, which enhances wellbore evaluation and liner running; eliminate the risk of fishing for lost cones.

To meet these objectives the use of turbodrilling and hybrid bit technologies was a feasible solution. Hydraulic simulations were run to determine if the mud pumps will deliver the required hydraulic power to the 6 5/8-in turbine, drill stem design was performed to avoid fatigue failures and increase the rotating hours on bottom in a high temperature environment, directional performance was analyzed to estimate the dogleg severity (DLS) in carbonates with black chert nodules to be able to reach the proposed geologic objective.

The turbodrill and hybrid bit application drill 378 m, the longest run in the field, eliminating two trips to the surface comparing with TCI bit runs. The application built inclination and turn the wellbore at the planned DLS. Additionally, increased service life of the managed pressure drilling (MPD) rotary head and top drive washpipe was observed. Casing wear was reduced due to the low rpm on surface and it was corroborated with the low amount of steel recovered in the shale shakers magnets. Trips to surface were without drag and 7-in liner was run right after logging, eliminating a wiper trip.

The field has an aggressive development and lesson learned from this application will reduce drilling times and meet region objectives to boost production from hard carbonates reservoirs. Horizontal wells are being drilled, turbodrill and hybrid bit demonstrated to be feasible solution for this challenge in Mexico south region.

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