An experimental device and method for determining miscible phase pressure and solid phase precipitation in carbon dioxide flooding of an oil reservoir

By designing an experimental device for judging the miscibility pressure and solid precipitation of oil reservoirs through carbon dioxide flooding, and by using constant mass expansion experiments and single stripping experiments, the problem of not being able to simultaneously judge miscibility and characterize asphaltene changes in existing technologies has been solved, realizing rapid and low-cost judgment of miscibility pressure and analysis of solid precipitation.

CN122407175APending Publication Date: 2026-07-17PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2025-01-15
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing carbon dioxide flooding technology cannot simultaneously determine whether the injected gas and the oil reservoir fluid are miscible, nor can it characterize the changes in resins and asphaltenes. It requires the separate purchase of miscible flooding experimental equipment and solid phase precipitation testing equipment, which is costly and time-consuming.

Method used

Design an experimental device for judging the miscibility pressure and solid phase precipitation of oil reservoirs by carbon dioxide injection flooding, including an injection vessel, a visible high temperature and high pressure vessel, a single-phase extraction test unit and a four-component test unit. Through constant mass expansion experiment, single-phase extraction experiment and four-component experiment, obtain the saturation pressure, gas-oil ratio, resin content and asphaltene content after gas injection. Combine the carbon dioxide injection ratio to judge the miscibility pressure and solid phase precipitation.

Benefits of technology

It enables simultaneous determination of whether the injected gas and the oil layer fluid are miscible in a single device, and characterizes the changes in gum and asphaltene. It is simple to operate, low in cost, and fast.

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Abstract

本发明提供的一种油藏注二氧化碳驱混相压力判别及固相析出实验装置及方法，包括：可视高温高压釜，用于将配置得到的原始油层流体及注入的二氧化碳进行搅拌混溶形成注气后的高温高压油藏流体，并用以观测该注气后的高温高压油藏流体的饱和压力；单脱实验测试单元，用于在大气压环境下将注气后的高温高压油藏流体进行分离，并计算气油比；四组分测试单元，用于测试单脱实验测试单元分离后得到的油层流体的四组分含量；本发明提供了一种确定注二氧化碳驱混相压力的新方法，解决了现有的注二氧化碳驱混相采油方法中存在的无法在判断注入气与油层流体是否混相时，表征表征胶质、沥青的变化规律。
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Citation Information

Patent Citations

  • Experimental device for dynamically measuring asphaltene precipitation amount under CO2-crude oil action

    CN107014722A

  • Carbon dioxide flooding miscible-phase experimental instrument for oil-gas field development

    CN215180194U