Effective Planning for Dispersant Operations – Making Decisions, Analyzing Options and Establishing Capability

Abstract

Within the oil spill response community, dispersant use is considered to be a key tool for the treatment and mitigation of oil spills. As a response technique, the benefits of dispersant application have been long proven, particularly in the case of large offshore spills such as those associated with the Sea Empress (UK, 1996), Montara (Australia, 2009) and Macondo (USA, 2010) incidents. Compared to other spill response techniques, dispersant application has less operational constraints associated with adverse weather conditions and can be rapidly applied from an aerial platform for larger spills far offshore. These reasons render dispersant application a critical tool in the toolbox for many offshore operators. Developing a successful dispersant application strategy requires comprehensive planning. For an offshore operator with a subsea well blowout risk, a number of elements should be carefully considered to ensure the successful execution of the dispersant application strategy. The decision making process should include a detailed evaluation of the oil type, release scenario and location, and the consideration of these parameters against the larger environmental and socio-economic needs of the stakeholder community. Once dispersant application is established to be a viable response option using a process such as Net Environmental Benefit Analysis (NEBA), the operator also needs to ensure that it is adequately resourced in terms of application platforms (vessel vs aircraft), monitoring techniques and supporting logistics. Well planned and detailed operational strategies are critical for successful subsea and surface dispersant operations, especially in the unlikely event of a large offshore spill. This paper summarizes the various operational considerations an offshore operator needs to assess during the preparedness stage for developing a viable dispersant application strategy. Drawing on the authors’ experiences in developing and implementing various preparedness projects globally, the different aspects of the dispersant planning process, including oil spill modelling to support decision making, ascertaining dispersant effectiveness for the oil type, selecting appropriate application techniques, establishing necessary logistical support and the setting up of an incident management team to support dispersant operations, will be discussed in detail. The goal of the paper is to build upon prior dispersant strategy discussions and provide an operationally focused blueprint for planning and implementing an effective dispersant application strategy in support of offshore operations.