Method for detecting concentration of corrosion inhibitor by spectrophotometer

Abstract

The invention discloses a method for detecting the concentration of a corrosion inhibitor by a spectrophotometer. A tri-hydroxymethyl aminomethane hydrochloride buffer solution is used for providing aweak alkaline environment for a system, so that a pH value (8.0) of a buffer system is prevented from being changed, and the problems that phosphate ions in a traditional phosphate buffer solution and ions such as calcium and magnesium in produced water form a large amount of calcium phosphate and magnesium phosphate precipitates, which leads to the results that the buffer solution becomes non-uniform suspension, the accuracy of a concentration detection result of the corrosion inhibitor is poor, and the repeatability is poorer are solved; the detection result of the concentration has relatively-high accuracy and feasibility.

Description

technical field [0001] The invention belongs to the field of detection of corrosion inhibitors in oil and gas fields, and in particular relates to a method for detecting the concentration of corrosion inhibitors with a spectrophotometer. Background technique [0002] As an environment-friendly corrosion inhibitor, imidazoline quaternary ammonium salt corrosion inhibitor not only has very good corrosion inhibition performance, but also is non-toxic, non-irritating odor, good thermal stability, and has no harm to the human body and the surrounding environment. At present, it is mostly used for oil and gas well shaft anticorrosion in the process of oil and natural gas exploitation. When the imidazoline quaternary ammonium salt corrosion inhibitor is added downhole, the anticorrosion effect of the wellbore is often analyzed and evaluated by the concentration of the corrosion inhibitor in the produced water of the oil and gas well. If the amount of corrosion inhibitor added is t...

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Problems solved by technology

[0004] For spectrophotometry, when the traditional phosphate buffer system is used to measure the concentration of corrosion inhibitors for highly hard sewage such as oil and gas well produced water, the phosphate ions in the buffer will interact with the calcium, calcium, and Magnesium plasma forms a large amount of calcium phosphate and magnesium phosphate precipitates, making the buffer solution into a non-uniform suspension, which seriously affects the normal progress of the experimental work, resulting in poor accuracy and repeatability of the corrosion inhibitor concentration test results. Difference

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