Experimental investigation on the flow and rock breaking characteristics of supercritical carbon dioxide jets
Experimental investigation on the flow and rock breaking characteristics of supercritical carbon dioxide jets
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超临界二氧化碳射流流动及破岩特性实验研究
DOI：
10.1016/j.petrol.2019.106735
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发表时间：
2020-04
影响因子：
--
通讯作者：
Cai Can
中科院分区：
文献类型：
--
作者：
Huang Man;Hu Yi;Wang Xiaochuan;Kang Yong;Cai Can
超临界二氧化碳(SC-CO2)射流因其优于水射流而在钻井和完井工程中受到越来越多的关注。为了了解超临界CO_2射流的性质，提高其性能，对超临界CO_2射流的流动特性进行了实验研究，并进行了岩石破碎试验。利用高速摄像机拍摄了不同工况下射流的流动图像。对超临界CO_2射流与经典理论和其他类型的射流进行了对比分析。结果表明，淹没环境对超临界CO_2喷流的特性有很大影响。当喷射到气态CO2环境中时，饱和曲线交叉，喷流中发生强烈的相变。射流表现为典型的单相气/气湍流剪切层。而在SC-CO2水下环境下，喷流中存在激波。初始不稳定性和扩散率随进口压力的增大而减小。射流表现为典型的可压缩射流。这些特点与水射流不同，很可能是SC-CO2喷射机具有更好的破岩性能的原因。此外，在气态CO2环境下，SC-CO2射流容易产生大而浅的破碎坑，而在SC-CO2环境下的射流往往会导致小而深的破碎坑。
Supercritical carbon dioxide (SC-CO2) jets are of increasing interest in drilling and completion engineering due to their superiority over water jets. To understand the nature of SC-CO2jets and improve performance, the flow characteristics of SC-CO2jets were experimentally investigated, followed by rock breaking tests. Flow images of the jet under various operating conditions were captured by a high speed CCD camera. A comparative analysis of an SC-CO2jet flow with classical theories and other types of jet flows was performed. The results show that the submerged environment can greatly affect the characteristics of SC-CO2jets. When injecting into a gaseous CO2environment, the saturation curve is crossed and intense phase transition occurs in the jet flow. The jet appears as a classical single-phase gas/gas turbulent shear layer. Whereas, under an SC-CO2submerged environment, shock waves can be found in the jet flow. The initial instability and spreading rate reduce with the increase in inlet pressure. The jet behaves as a typical compressible jet. These features are different from water jets and are most likely the reason for the better rock breaking performance of SC-CO2jets. Further, SC-CO2jets under a gaseous CO2submerged environment are prone to result in large and shallow breaking pits, while the jets under an SC-CO2environment tends to cause small and deep breaking pits.
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影响因子：
15
作者：
D. Koch;W. Leitner
通讯作者：
D. Koch;W. Leitner
DOI：
--
发表时间：
1971
期刊：
--
影响因子：
--
作者：
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通讯作者：
A. Chapman;W. Walker
影响因子：
6.4
作者：
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通讯作者：
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影响因子：
1.2
作者：
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通讯作者：
Haizhu Wang;Gensheng Li;Zhenguo He;Zhonghou Shen;Meng Wang;Youwen Wang
影响因子：
3.7
作者：
D. Papamoschou;A. Roshko
通讯作者：
D. Papamoschou;A. Roshko