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Enhancing Offshore Coiled-Tubing Interventions in Difficult Weather Conditions

Topics: Coiled tubing

An operator requiring an offshore coiled-tubing (CT) intervention offshore Brunei in the South China Sea encountered challenging monsoon weather conditions as well as limited and aging offshore facilities. Innovative technologies from various applications, including a full-catenary CT system, a dynamic-positioning (DP) vessel, a knuckle-boom crane, and a heave-compensated gangway, were combined to provide the operator with a successful solution for CT-intervention improvement.

Introduction

Operations were performed in the Darussalam offshore waterflood oil field. The field’s average sea depth was approximately 30 m of water, and the field was approximately 70 km northeast of Seria. A central field complex had living quarters for approximately 160 personnel, gas lift and compression facilities, and water-injection facilities. Waterflooding was a significant factor supporting the hydrocarbon-production levels, and, to increase hydrocarbon production, water-injection improvements were required.

During monsoon season, the conventional well-intervention vessel had a limited operating envelope because it was unable to hold in a rough sea position and lacked emergency-disconnect CT and hydraulics-hose systems and a compensated gangway. These limitations made safe operation impossible during monsoon season. Once the operating rate was deemed limited, stimulation (acidizing) activity was postponed, thus affecting production results. However, with new concepts of intervention, the vessel was able to continue operating during rough sea conditions safely and more efficiently.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 24693, “Enhancing the Operational Envelope for Offshore Coiled-Tubing Interventions To Be Performed in Monsoon Season,” by Reawat Wattanasuwankorn, Franklin Hammer, and Richard Christieson, Halliburton—Boots & Coots, and Yan Song and Nick Long, Brunei Shell Petroleum Company, 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 The paper has not been peer reviewed.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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Enhancing Offshore Coiled-Tubing Interventions in Difficult Weather Conditions

01 June 2014

Volume: 66 | Issue: 6

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