May 2022, Vol. 249, No. 5

Features

27-Day ILI Run: A Case Study of a Low-Pressure, Low-Flow Gathering Line

By Denise M. Earles, P.E., and Peter Van Beugen Pipesurvey USA, an INVACOR Partner Company, and Pipesurvey International  In 2011, a customer, who was in a difficult situation, approached Pipesurvey International (PSI). The customer had a pipeline that ran from the Q1 Field in the North Sea 52 miles (81 km) off the coast of The Netherlands, to an offshore terminal that needed an in-line inspection (ILI).  Unfortunately, the Q1 Field was at the end of its life, resulting in very little production with no feasible method to boost the flow rate. The resulting run conditions (Table 1) made an ILI run exceptionally difficult. However, the regulatory au

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