Complex Subsea to Subsea Pigging Operations of Pipelines

Abstract Objectives/Scope Operators of subsea pipelines sometimes find advantages in performing subsea to subsea pigging operations. This type of pigging may be necessary in order to facilitate a specific field layout or concept. However, operational pigging and inspection pigging from subsea pig launchers to subsea pig receivers can create several design and operational challenges. These are identified and addressed in this paper. Methods, Procedures, Process Two main types of pigging operations are identified. The main challenges are: Results, Observations, Conclusions The methods and the solutions that we have chosen to use in recent projects are described. The background information leading up to the decisions and choices taken will be discussed. Special focus will be given to the importance of planning for any subsea operational and/or inspection pigging up front in the field layout and design phases, i.e. at the same time as the commissioning pigging is defined. The need for a reliable and safe pig tracking management system will be addressed and our observations with respect to this issue will be included. The specific advantages for the Subsea Automated Pig Launcher will be highlighted, a short list of these are: Novel/Additive Information This paper will present practical and sound solutions of how to perform subsea to subsea operational and inspection pigging in a cost effective and safe manner. It will also highlight and explain the importance of planning for any subsea operational and/or inspection pigging up front in the field layout and design phase. This is often not a high focus element and this can result in very costly modifications later in the field life.