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Calculation on the following performance of proppant in supercritical carbon dioxide
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Hou, Lei, Sun, Baojiang, Jiang, Tingxue, Geng, Xueyu and Wang, Zhiyuan (2016) Calculation on the following performance of proppant in supercritical carbon dioxide. Acta Petrolei Sinica [Shiyou Xuebao], 37 (8). pp. 1061-1068. doi:10.7623/syxb201608013 ISSN 0253-2697.
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Official URL: http://doi.org/10.7623/syxb201608013
Abstract
As a new type of fracturing fluid, supercritical carbon dioxide (SC-CO2) has now become the research hotspot in domestic and foreign academia. However, the relevant technique is limited by the unclear sand-carrying mechanism. In this study, the concept of following performance is introduced to investigate the sand-carrying performances of fracturing fluid; the following performance of proppant and the sand-carrying performance of fracturing fluid are characterized by the ratio of the proppant horizontal velocity to the fracturing-fluid horizontal flow velocity. Then the following performance of proppant is used as the criteria for evaluating the horizontal sand-carrying performances of SC-CO2. Based on the classic BBO equation, the expression of drag force has been modified; in combination with the auxiliary equations of drag force coefficients, a calculation model has also been established to analyze the following performance of proppant in SC-CO2, which provides the theoretical foundation for evaluating and optimizing the transportation of proppant in SC-CO2. To verify the correctness of the model, an experiment is conducted on the following performance of proppant using the self-developed equipment, and then the factors that affect the following performance of proppant in SC-CO2 are analyzed. The results show that the following perfomance of proppant is slightly affected within the common range of density, which is consistent with the previous experimental results. In addition, a comparative analysis is performed on the following performance of sands in SC-CO2, slickwater and air. The analysis results indicate that the sand-carrying performance of SC-CO2 is more affected by its high-density property but less affected by its low viscosity. Because of high-density and low-viscosity properties, SC-CO2 is far better than air but worse than or approximately equal with slickwater in terms of sand-carrying performances. Especially at a high flow velocity, the horizontal sand-carrying performance of SC-CO2 is comparable to that of slickwater.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | Acta Petrolei Sinica [Shiyou Xuebao] | ||||||||
Publisher: | Zhongguo Shiyou Xuehui | ||||||||
ISSN: | 0253-2697 | ||||||||
Official Date: | 2 September 2016 | ||||||||
Dates: |
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Volume: | 37 | ||||||||
Number: | 8 | ||||||||
Page Range: | pp. 1061-1068 | ||||||||
DOI: | 10.7623/syxb201608013 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
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