Alebachew Demoz

Comparison of Laboratory Methodologies to Evaluate Corrosion Inhibitors for Oil and Gas Pipelines

Abstract Experiments were carried out using a loop in three fields (gassy-oil, oily-gas, and oil-transmission pipes) under 17 operating conditions, using six inhibitors (three continuous and three ...

Comparison of Techniques for Monitoring Corrosion Inhibitors in Oil and Gas Pipelines

Abstract Addition of corrosion inhibitors is one of the common methods to control both general and pitting corrosion of oil and gas pipelines. Development of an integrity management program to control internal corrosion of such pipelines depends on our ability to monitor the efficiency of the inhibitor performance. Monitoring in an oil and gas pipeline is a complex process due to the multitude of conditions that exist in such an environment. In this paper, the reliability of weight loss, linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), electrochemical noise (EN), and externally mounted hydrogen probes for monitoring inhibitor performance in oil and gas pipelines is investigated.

Effect of Field Operational Variables on Internal Pitting Corrosion of Oil and Gas Pipelines

Abstract Experiments were conducted in six operating oil and gas production pipelines over four years to determine internal pitting corrosion rates under realistic operating conditions. —Pitting co...

A New Impinging Jet Device for Corrosion Studies

Abstract A new high-pressure, high-temperature submerged impinging jet device is described. The experimental results of its flow characteristics are summarized. The device generates well-developed ...

An Instrumented Field Corrosion Test Loop

A multi-purpose instrumented loop in line with an oil producing well is described. The loop has several ports for coupons which were replaced periodically. Some of the coupons were used for electrochemical monitoring in addition to weight loss and visual inspection.Weight loss, pit rate and all the electrochemical methods used gave corrosion rates that were dependent on the positions of the coupons inside the loop. The corrosion rate of the coupons increased from top to bottom. This order reflected the media and flow to which the coupons were exposed in a multi-phase producing well.Copyright