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The Polymer injection project on the Dalia field, a high permeability sandstone reservoir deep offshore Angola, is a world first in both surface and subsurface aspects. A phased approach was used to manage risks, along with development of new monitoring approaches.

The three papers in this issue address safe design of facilities, use of the chemical acrolein in an offshore environment, and the integration of reservoir and pipeline modeling to capture the variations in reservoir-flow dynamics with changes in the surface-network operating conditions.

This paper describes a gas-hydrate model for oil-dominated systems, which can be used for the design and optimization of facilities focusing on the prevention, management, and remediation of hydrates in flowlines.

Offshore production systems can be impacted negatively by numerous problems attributed to bacterial activity, associated hydrogen sulfide and biogenic iron sulfides, and mercaptan production. Acrolein provides a distinctive all-in-one chemical solution to assist in resolving these problems.

This paper reviews the key areas for facility designers and engineers to include when designing facilities to ensure safe facilities. Use and incorporation of the principles outlined in this paper should enable engineers and designers to build safe facilities that reduce the risk of major incidents.

Paradoxical effects can exist when expanding the capacity of natural-gas-transportation networks. This paper derives conditions where it can be expected, how the effect can be masked, and provide analysis to support identification in larger-scale networks.

In gas applications with high-pressure drops and/or high-velocity gas flow, acoustic-induced vibration (AIV) occurs when very high sound levels are propagated in piping. This can induce fatigue cracking of the pipe and potentially catastrophic pipe failure.

This month's papers cover a new method to evaluate the design pressure of flowlines and risers, pipeline integrity assessment, treatment and removal of sand from pipelines, and considerations around the in-situ burning of oil on water.

Setting optimal surface separation pressures are crucial for maximizing the surface liquid production from the wellstream feed. Where separator tests are not available, empirical calculations are often used, but with limitations. A method suitable across many conditions is proposed.

A methodology is proposed for design of subsea flowlines and risers coupled with a subsea high-integrity pressure protection system (HIPPS) for fields with high shut-in tubing pressure (SITP).