Strain-Based Pipeline Repair via Type B Sleeve

Crapps, Justin M. (ExxonMobil Upstream Research Company) | Yue, Xin (ExxonMobil Upstream Research Company) | Berlin, Ronald A. (ExxonMobil Upstream Research Company) | Suarez, Heider A. (ExxonMobil Production Company) | Pribytkov, Petr A. (Exxon Neftegas Limited) | Vyvial, Brent A. (Stress Engineering Services) | Proegler, Jared S. (CRC Evans Pipeline International)

OnePetro 

Integrity management of strain-based pipelines includes measures such as corrosion prevention, external damage prevention, ground movement monitoring, and geohazards mitigation. Despite preventive efforts, a pipeline may still become corroded or damaged. The damage may reduce the pipeline’s strain capacity and a repair method to restore the pipeline’s capacity will be required. This paper presents the qualification of the Type B split sleeve, a sealing repair methodology, for strain-based pipelines. The subjects addressed include selecting the Type B split sleeve as a repair candidate, finite element modeling of the repair, sleeve welding with in-service flow conditions, and full-scale proof testing of three repaired pipes.

INTRODUCTION

Production and delivery of hydrocarbons in remote locations often require transportation of the hydrocarbons across challenging terrain. This may expose a pipeline to geohazards including faults, landslides, permafrost, earthquakes, and ice gouging. Pipelines are traditionally designed for pressure containment (a circumferential load), whereas most geohazards affect a pipeline by imposing loading in the longitudinal or axial direction. In extreme cases, the longitudinal loading can cause significant degrees of plastic deformation. Traditional pipeline design does not consider extreme longitudinal loading and the design methodology must be modified to ensure that the pipe is able to withstand all loading conditions.