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Optimization Work Flow Converts Power to Performance for GOM Drilling

Time spent on bottom drilling is only approximately 10% of the time consumed by drilling operations, but this still provides a significant opportunity for savings if it can be reduced. The goal of the work described in this paper was to decrease this percentage while drilling an exploratory well in the Gulf of Mexico. Significant results were achieved with the use of advanced hybrid polycrystalline-diamond-compact/tungsten-carbide-insert (PDC/TCI) bits.

Introduction

The focus well is in the Walker Ridge area approximately 150 nautical miles south of Port Fourchon, Louisiana. The rig floor to the zone of interest includes 6,500 ft of water, 1,200 ft of sediments, 12,250 ft of salt, and then deeper sediments. In the basic well design, a 38-in. conductor would be jetted to 200 ft below the mudline. The 26-in. section would be drilled through sediments and 2,000 ft of salt without risers using seawater and a 9.3‑lbm/gal water-based pump-and-dump (PAD) drilling fluid, after which the 22-in. casing would be set. The 16½-in. section would be drilled through the bulk of the remaining salt with a riser in place using synthetic-based drilling fluid. The well would remain vertical until the kickoff point. After setting a 14‑in. casing, the remaining hole sections would exit the salt and penetrate the deeper zones using synthetic-based drilling fluid.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 29065, “Converting Power to Performance: Gulf of Mexico Examples of an Optimization Work Flow for Bit Selection, Drilling-System Design, and Operation,” by Mark W. Dykstra, SPE, Miguel A. Armenta, SPE, Fitzerald A. Mathew Ain, SPE, Omolara Adesokan, and Tess L. Schornick, Shell, and Ashabikash Roy Chowdhury, SPE, and Mark D. Allain, Baker Hughes, a GE company, prepared for the 2018 Offshore Technology Conference, Houston, 30 April–3 May. The paper has not been peer reviewed. Copyright 2018 Offshore Technology Conference. Reproduced by permission.
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Optimization Work Flow Converts Power to Performance for GOM Drilling

01 February 2019

Volume: 71 | Issue: 2

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