Optimising of pipeline maintenance using deposit profile technology

Abstract

With an aging pipeline system, the petroleum industry is experiencing new challenges in maintaining the pipeline integrity. In the Master’s thesis, a method and technology for internal pipeline diameter detection is presented. By measuring the pressure signature during a conventional utility pigging operation, the changes in internal pipeline diameter are detected. The method is evaluated and its applicability for optimising the pipeline maintenance programme is discussed. The first part of the thesis is an overview of the challenges that operators are facing concerning pigging operations. Various solutions are reviewed for maintaining pipeline integrity. Further is a review of current management plans with focus on inspection activities. Thesis method and technology including the theory involved is presented with relevant examples. Two case studies at test laboratories were conducted as part of the thesis. The first case study verified the method and technology. The subsequent case study gave indications toward the method’s detectability and repeatability. The result of the case studies show potential for implementation and optimisation of the pipeline maintenance programmes. Finally, a few suggestions that might improve the technology are discussed.