The balance of effectiveness, risk and cost is common to every offshore project. This is especially true of subsea well intervention where success may include a broader spectrum of outcomes and risks may be more difficult to quantify. Intervention planning may require a progression of assumptions and contingency planning for each variable. The variables may range from technical capabilities of the equipment to completion and production problems. Production problems are not always easily diagnosed. If a problem is identified, several solutions may be on offer. Solutions may range from simple through-tubing operations to total recompletion or even sidetrack. Misinterpretations and misapplications may do more damage than the original problem and as a result the cost of failure can be very high. In an environment of multiple high impact risks, the cost of mitigating all or most of the risk of failure can also be prohibitive. Balancing the potential benefit of the project, the various commercial and technical risks, and the cost of mitigating the most onerous of those risks is the job of the project team. With the emphasis on intervention equipment and deployment, this paper will summarize the broad scope of options, the associated risks, and some guidelines to control the cost of projects and mitigate the cost of failure.
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