An in situ method for determining the size of asphaltene precipitates formed by CO2

By designing an asphaltene precipitation determination device for simulated CO2 drive conditions, the problem of difficulty in accurately measuring the asphaltene precipitation size in the prior art is solved, and an accurate assessment of the causes and mechanism of reservoir blockage is achieved, and targeted response measures are provided.

CN115639309BActive Publication Date: 2025-03-28ZHEJIANG OCEAN UNIV
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Patent Information

Application Number
CN202211085044.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-06
Publication Date
2025-03-28
Estimated Expiration
2042-09-06

AI Technical Summary

Technical Problem

The prior art is difficult to accurately measure the size of asphaltene precipitates formed by CO2 drive, and cannot effectively evaluate the causes and mechanisms of reservoir blockage, resulting in the inability to provide targeted response measures.

Method used

A dimension in situ determination device for CO2-driven asphalt precipitation is designed, including the first and second reactors, filtration devices and cumulative flowmeters, and the size of asphaltene precipitation particles is measured using a microporous filtration membrane to simulate the dynamic flow process of crude oil under CO2 injection.

Benefits of technology

It realizes accurate and reliable measurement of the asphaltene precipitation size, can evaluate the causes and mechanism of reservoir blockage, provides targeted response measures, and has practical application value.

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Abstract

The invention relates to the technical field of crude oil production, and discloses a method for in-situ determination of the size of asphaltene precipitates formed by CO2 driving. The method adopts in-situ determination of the size of asphaltene precipitates formed by CO2 driving for determination. The method can adjust the operating conditions such as pressure, temperature, crude oil type, CO2 purity, etc. according to actual conditions, simulate the in-situ generation of asphaltene precipitate particles under the dynamic driving conditions of CO2, accurately and reliably determine the size of asphaltene precipitates, and the determination result can be used to evaluate whether the cause of reservoir blockage is surface deposition, entrainment or pore throat blockage, and take targeted measures, which has practical application value.
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