Effectively engineered flowline bundles are attractive configurations for deepwater field development, because of their thermal performance and cost effectiveness. Bundled-insulated subsea flowlines provide economic alternatives for chemical injection to eliminate or reduce the risk of hydrate, wax or paraffin formation. The purpose of this study is to investigate the thermal interaction among the flowlines and its effects on the overall thermal performance of the bundle, and on the product arrival temperature. Multiphase flow and thermal analysis procedures were conducted for the Garden Banks 216 field pipeline bundle located in the Gulf of Mexico. The investigated bundle has three flowlines that carry multiphase product fluid and heating fluid.

The flowlines are enclosed with insulation and encased in a steel casing pipe. During normal operation, the product can flow in one or two flowlines while the third is for service. When active heating is applied, hot oil will be injected into one of the flowlines at the platform. The heating oil will be circulated through the flowline and the service line, and the third line will be for produced fluid. The pigging loop will be used as the turnover loop.

This study is to determine the steady state performances of each flowline in the bundle, including the multiphase product line and two-single phase heating lines. The temperature profiles are presented for different product flowrates. The effects of product flowrate, injection flowrate and injection temperature on the pipeline temperature profiles and product arrival temperature are discussed.

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