Laboratory assessment of corrosion inhibitors efficiency at oilfield pipelines of West Siberia region II. Tests in a U-cell

Abstract

This paper is a continuation of a series of publications related to laboratory assessment of the performance of carbon dioxide corrosion inhibitors for oilfield pipelines in the West Siberian region. The test results obtained in U-shaped glass cells are considered. The effects of temperature, carbon dioxide content, test duration, specimen surface condition, presence and volume of a hydrocarbon phase, and inhibitor concentration on the corrosion kinetics and protective properties of a wide range of industrial inhibitors are analyzed. Recommendations are given on specific inhibitor test conditions to be used for assessment of inhibitor suitability for the protection of water pipelines and oil pipelines with low watercut.

Laboratory assessment of the efficiency of corrosion inhibitors at oilfield pipelines of the West Siberia region IV. Tests in a flow recirculation loop

“…Like in [2,3], these tasks were addressed using commercial inhibitors as examples. At the same time, we have kept the previously accepted numeration.…”

“…A model water solution simulating the formation water at West Siberia fields and a two-phase model fluid on its basis were selected as the corrosive fluids. The make-up of these fluids and their preparation for the test are described in [2].…”

“…Preparation of steel specimens for the test, their post-test treatment, and estimation of K values followed by calculation of the protection levels (Z) were similar to those described in [2]. At least 3 parallel experiments were made in each fluid.…”

“…In our point of view, such testing is a mandatory stage in inhibitor selection for their piloting in real pipelines. The purpose of this paper is to assess the capability of this method in ranking of carbon-dioxide corrosion inhibitors and define the test conditions that precisely simulate the conditions of oilfield pipeline operation which are critical in terms of the failure rate.Like in [2,3], these tasks were addressed using commercial inhibitors as examples. At the same time, we have kept the previously accepted numeration.…”

Laboratory assessment of corrosion inhibitors effectiveness at oilfield pipelines of West Siberian region. III. Bubble test

“…The purpose of this paper is to assess the capability of this method in ranking of carbon-dioxide corrosion inhibitors for the West Siberian region and determine the test conditions that ensure the most accurate results. We addressed these tasks using the same commercial inhibitors as in [6] as examples. The numbering of inhibitors used in that study was also kept unchanged.…”