Abstract

The All Metal Progressing Cavity Pump (AMPCP) has been widely used in previous years, in particular in Thermal Enhanced Oil Recovery (TEOR) applications and also in cold aggressive conditions. These harsh environments require continuous improvement of the product Run Life. This is achievable if there is a strong link between Product Development Teams and Operations.

The AMPCP behavior during its real conditions of operation remains partially unknown as it cannot be fully instrumented and monitored. The influence of high temperature, high pressure, corrosive gas and mechanical loads on the failure, are therefore difficult to establish. In this paper, a methodology is proposed to solve this problem, based on coupled experimental and numerical analysis. The initial aim is to evaluate the pump behavior in its running conditions (pressure, rotation speed) and to consequently predict pump failure due to fatigue and/or corrosion effect.

In an attempt to continuously optimize the All Metal PCP technology, the experimental work has been done in partnership referring to fatigue and corrosive test on specific alloys in order to choose the best material for run life improvement in various running conditions. The numerical work is based on a strongly coupled Fluid Structure Interaction (FSI) study. This analysis shows that the fluid influences consequently the stress level in the pump. It shows that the structure influences the fluid behavior too. This means that the classical static approaches generally focused on only the fluid or only on the structure are not suited for PCP. This new approach can be used to determine the optimal design.

Once the identified solutions have been implemented, a close Operation follow up through Field Track software will be used to validate this approach and its success, closing the loop of run life improvements.

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