On the issue of substantiating the use of nitrogen pressure-compensation downhole sampling technology

Abstract

With the increasing complexity of geological conditions, quality sampling of reservoir fluids becomes an increasingly difficult task, which requires new approaches to technology and a deep understanding of the physical and chemical processes occurring in the reservoir and well. The use of samplers with nitrogen pressure compensation is a relatively new direction in the Russian Federation that service companies can offer to solve this problem. However, the lack of clear criteria for justifying the use of compensatory samplers leads to a containment of their application due to their high cost. In this paper, the authors propose to use the procedures for evaluating the stability of asphaltenes (the probability of asphaltene deposits) as such criteria and describe the developed algorithm for expert evaluation of the need to use compensatory samplers.