高含二氧化碳采出物节流特性的实验研究

发布时间：2018-04-20 18:32

本文选题：CO驱油 + 高含二氧化碳流体　；参考：《科学技术与工程》2017年32期

【摘要】：随着CO_2驱油技术的发展,高含CO_2采出物在通过井口节流阀时由于焦耳-汤姆逊效应会造成阀后低温,继而可能产生冻堵的风险。本文通过实验研究了高含CO_2采出物(CO_2/天然气/N2/油/水)在通过节流阀时的温降情况,分别分析了阀前后压降、气液比、含水率等对节流温降的影响。研究发现:节流阀前后压降与节流温降呈线性关系;节流压降越大、二氧化碳的含量越高、气液比越大、含水率越低,节流效应越明显,阀后温度也越低,藉此提出基于阀后温度确定井口防冻的临界气液比的方法,该研究为高含CO_2油井井口防冻及集输工艺提供技术指导。
[Abstract]:With the development of CO_2 oil displacement technology, the Joule-Thomson effect will result in the low temperature after the high CO_2 recovery passing through the throttle valve at the well head, which may lead to the risk of freezing and plugging. In this paper, the temperature drop of CO _ 2 / natural gas / N _ 2 / oil / water) produced by high content CO_2 through throttle valve is studied experimentally. The effects of pressure drop, gas-liquid ratio and moisture content on throttling temperature drop are analyzed respectively. It is found that there is a linear relationship between the pressure drop and the throttling temperature drop before and after the throttle valve, the larger the throttling pressure drop, the higher the carbon dioxide content, the greater the gas-liquid ratio, the lower the moisture content, the more obvious the throttling effect and the lower the temperature behind the valve. A method for determining the critical gas-liquid ratio of the wellhead freezing resistance based on the back valve temperature is proposed, which provides technical guidance for the well head freezing prevention and gathering and transportation process of high CO_2 oil wells.
【作者单位】：中国石油大学(华东)储运与建筑工程学院;山东省油气储运安全省级重点实验室;
【基金】：国家自然科学基金(51374231) 中央高校基本科研业务费专项资金(14CX02207A,17CX05006,16CX06005A)资助
【分类号】：TE863

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