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

Laboratory assessment of the efficiency of corrosion inhibitors at oilfield pipelines of the West Siberia region I. Objective setting

“…The "wheel test" [14,[23][24][25] features low rates of the corrosive fluid flow. It is combined with the weight loss method of corrosion rate measurement.…”

“…In fact, publications [23,[34][35][36] compare the results of lab testing of six inhibitors against the results on their performance under natural conditions in oil and gas pipelines. The tests were carried out in a model electrolyte under static conditions using the bubble method, the rotating cage method, on the wheel facility, on rotating disc and cylinder electrodes, and also by the impingement method.…”

“…The rotating cage test is carried out using a special facility (Fig. 5) [23,28]. It has the form of a plastic holder with flat samples that is installed on the axis of a motor whose rotation speed is normally 160 rpm.…”

“…The shear stress in the cell can be up to 150 Pa. Equipment for this type of tests is fabricated by Process Measurement and Control Systems (UK). The impingement method is used for corrosion survey in a fluid flow and for assessment of corrosion inhibitor performance [21,23,24]. The test facility consists of a central cell with four extensions equipped with spray nozzles.…”

“…The rotating cylinder electrode (Fig. 4) [20,21,23,[28][29][30][31][32][33] allows high velocities of turbulent flow to be achieved. The facility design is similar to that used in electrochemical tests with rotating disc electrode, the difference being that the cylinder side surface, rather than its flat end surface, serves as the electrode.…”