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Ultra-HP/HT Drilling-Fluid for Frontier Deep Gas Exploration

Topics: HP/HT
​ Fig. 1—Major fluid properties before and after 16-hour dynamic aging at BHT; 14-lbm/gal, 75:25 oil/water ratio (OWR) SBM formulations. ​

This paper discusses the laboratory evaluation of potential high-pressure/high-temperature (HP/HT) drilling-fluid designs considered for a deep gas exploration well in Malaysia. Laboratory testing included evaluation of rheological properties, fluid loss, sag, and electrical stability, along with chemical analysis. Properties were measured before and after extended dynamic and static aging, up to the expected bottomhole temperature (BHT) and bottomhole pressure. Formulations were adjusted and retested until acceptable results were achieved.

Introduction

Proper drilling fluid is a critical component in safe drilling in HP/HT exploration. High subsurface pressures are controlled by the elevated density of the drilling fluid achieved through high concentrations of weighting agents. However, high-density muds often possess high rheological properties and, as a result, exhibit high equivalent circulating densities (ECDs), lost circulation, and low rates of penetration. Formulating thermally stable fluid for extreme high temperatures is a challenging task because conventional oil-based-mud additives thermally degrade at approximately 400°F. Nevertheless, maintaining constant fluid density in extreme borehole conditions is essential for well control.

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper OTC 24830, “Ultra-HP/HT Drilling-Fluid Design for Frontier Deep Gas Exploration in South Malay Basin,” by Anuradee Witthayapanyanon, SPE, Kathi Chandramouleeswaran, Ahmad Bin Dollah, SPE, Dennis Clapper, SPE, Ronald Bland, SPE, and Akachai Kongsawast, SPE, Baker Hughes; and Michael Pepple, SPE, Khairul Anwar Nasrudin, SPE, and M. Abshar, SPE, Petronas, prepared for the 2014 Offshore Technology Conference Asia, Kuala Lumpur, 25–28 March. The paper has not been peer reviewed. Copyright 2014 Offshore Technology Conference. Reproduced by permission.
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Ultra-HP/HT Drilling-Fluid for Frontier Deep Gas Exploration

01 November 2014

Volume: 66 | Issue: 11

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