Technology Development in Subsea Flow Assurance

With offshore development migrating into ever-deeper waters, the industry is relying on subsea technology to facilitate increased oil and gas recovery while lowering costs and improving safety and operating efficiencies. The deepwater reservoirs being developed today also are becoming more challenging, with greater subsurface depths, higher pressures and temperatures, and more complex fluid systems.

Given these trends, the need has never been greater to understand flow assurance risks and design effective strategies to mitigate those risks. Flow assurance can be expressed as the coupling of multiphase flow and fluid phase behavior. It requires understanding both steady-state and transient multiphase flows, as well as fluid properties, fluid compositions, pressure volume temperature (PVT) characteristics, and other fluid phase behaviors from the reservoir to the topsides process equipment throughout the life of field to prevent upset conditions.

Flow assurance strategies are on the critical path to reducing overall development costs and ensuring safe and reliable subsea production operations. Since it has such a significant impact on field development and production system design, it is important to establish at an early phase of project planning whether flow assurance is needed. From the earliest stages onward, flow assurance operating philosophy should permeate each phase of field development engineering and project execution revealed as flow assurance design requirements. System modeling helps identify design limits and potential production issues.

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