An evaluation method for corrosion inhibitor of crude oil gathering and transportation system

Abstract

The invention discloses an evaluation method of a corrosion inhibitor of a crude oil gathering and transporting system. The evaluation method comprises the following steps of performing dehydrating treatment on crude oil in the gathering and transporting system; sequentially adding formation water to dehydrated crude oil, and emulsifying the added crude oil; determining the relationship of the change of the viscosity of the emulsified crude oil along with the change of the water ratio, and drawing a change curve; acquiring the water ratio when the viscosity is suddenly reduced through the curve of the change of the viscosity of the crude oil along with the change of the water ratio, enabling the emulsified crude oil of the water ratio when the viscosity is suddenly reduced to be used as a corrosion medium for determining the corrosion inhibition performance of the corrosion inhibitor; performing a corrosion inhibition evaluation screening experiment. According to the evaluation method of the corrosion inhibitor of the crude oil gathering and transporting system disclosed by the invention, through determining of a phase transformation point of a water-in-oil system to an oil-in-water system in the crude oil gathering and transporting system, the water ratio with suddenly-reduced viscosity when the crude oil gathering and transporting system is strongly corroded, is obtained; the water ratio when the viscosity is suddenly reduced is used as an index of the corrosion inhibitor performance evaluation experiment and used as an on-site corrosion inhibitor filling index, and the evaluation accuracy of the corrosion inhibitor of the crude oil gathering and transporting system is improved.

Description

Technical field [0001] The invention relates to the technical field of performance evaluation of corrosion inhibitors used in oil fields, in particular to a method for evaluating corrosion inhibitors of crude oil gathering and transportation systems. Background technique [0002] At present, oil field gathering and transportation systems mainly include crude oil gathering and transportation systems, natural gas gathering and transportation systems, and sewage gathering and transportation systems. Among them, the anti-corrosion problem of gathering and transportation systems has received more and more attention in recent years. The most commonly used method is to add Corrosion inhibitors. Screening and evaluating corrosion inhibitors is the prerequisite for determining whether the corrosion inhibitor is applicable. Therefore, the experimental conditions when evaluating corrosion inhibitors should be as close as possible to the on-site working conditions, or closely related to the o...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating corrosion inhibitors in crude oil gathering and transportation systems, by measuring the phase transition point from the water-in-oil system to the oil-in-water system in the crude oil gathering and transportation system, to obtain the corrosion inhibitor of the crude oil gathering and transportation system when strong corrosion occurs. Moisture content, the water content when the viscosity drops sharply is used in the corrosion inhibitor performance evaluation experiment and as the on-site corrosion inhibitor filling index, which improves the accuracy of the corrosion inhibitor evaluation of the crude oil gathering and transportation system, and overcomes the slowness of the current crude oil gathering and transportation system. The problem of low accuracy of etchant evaluation method

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