Testing method for corrosion and scaling properties of oilfield wastewater

Abstract

The invention discloses a testing method for corrosion and scaling properties of oilfield wastewater. The testing method comprises the following steps of: (1) testing an electrochemical impedance spectrum of a pipeline material in on-site oilfield wastewater; (2) designing a simulation pipeline, simulating flow-state information in a pipeline model under different flow speeds of a pipeline inlet by utilizing CFD (Computational Fluid Dynamic) software and determining an installation position of an experiment testing piece; (3) mounting the experiment testing piece on a dynamic pipeline and carrying out water circulation to stat a dynamic simulation experiment; measuring the thicknesses of scale layers of the test pieces at the different installation positions under different experiment durations; and (4) carrying out a data integrated analysis step: obtaining a relation between the thickness of each scale layer and each variable so as to obtain the corrosion and scaling properties of the oilfield wastewater. The testing method disclosed by the invention can be used for effectively testing the corrosion property and the scaling property of the oilfield wastewater and can reflect different conditions of each site very well aiming at different water quality and pipeline conditions of each specific water injection oilfield.

Description

technical field [0001] The invention belongs to the technical field of oil field water injection development and application, and more specifically relates to a test method for the corrosion and scaling characteristics of oil field sewage. It is a quick test method for specific on-site oilfield sewage (such as water injection used in water injection oilfields). Background technique [0002] As the oil pressure declines in the middle and late stages of oilfield development, water flooding is one of the main means for most onshore oilfields to enhance recovery. During the process of water injection in the oilfield, various physical and chemical changes will occur when the external water contacts the formation rocks in the oilfield, which will cause great damage to the formation. At the same time, during the water injection process, the fluid in the water injection pipeline will cause serious pipeline corrosion or even perforation in some cases due to the change of formation t...

AI Technical Summary

Problems solved by technology

At the same time, during the water injection process, due to the change of formation temperature and pressure, the fluid in the water injection pipeline may cause serious pipeline corrosion or even perforation in some cases, and some components are easy to precipitate, forming a scale layer in the water injection pipeline and blocking the water injection pipeline , have a very adverse impact on oilfield mining operations

[0003] Corrosion and scaling have occurred to varying degrees in many oilfields at home and abroad during the water injection process. Due to the differences in water quality and formation properties, it is difficult to have a unified and effective solution. Therefore, it is necessary to develop a set of targeted, energy-efficient The method of quickly predicting and proposing effective solutions is very practical

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