Study on the Impact Pressure of Swirling-Round Supercritical CO 2 Jet Flow and Its Influencing Factors

Yulong Yang, Han Liu, Weixuan Mao, Zhaojie Song and Haizhu Wang
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Yulong Yang: Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102200, China
Han Liu: Engineering & Design Institute of CPOE, Offshore Engineering Company Ltd., CNPC, Beijing 100028, China
Weixuan Mao: National Computer Network Emergency Response Technical Team, Coordination Center of China, Beijing 100029, China
Zhaojie Song: Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102200, China
Haizhu Wang: College of Petroleum Engineering, China University of Petroleum, Beijing 102200, China

Energies, 2020, vol. 14, issue 1, 1-15

Abstract: Supercritical carbon dioxide (SC-CO 2 ) jet is capable of decreasing the threshold pressure of rock breakage and mitigating formation damage, owing to its low viscosity, high diffusivity, and extremely-low surface tension. The swirling-round jet holds the advantages of both a swirling jet and a round jet. Therefore, the comprehensive technique, swirling-round SC-CO 2 (SR-SC-CO 2 ) jet, is expected to substantially enhance rock-breaking efficiency. However, theoretical analysis of the flow field characteristics of SR-SC-CO 2 has not been reported yet. This work aims to lay a theoretical foundation for employing SR-SC-CO 2 in drilling and fracturing. The flow field is simulated using Naiver-Stokes equations and the RNG k-ε turbulence model. Sensitivity analysis, regarding pressure drop of the nozzle, confining pressure, fluid temperature, jetting distance, the diameter of the nozzle’s central hole, and grooving area, are performed. We show that the combined swirling-round SC-CO 2 jet flow could maintain a relatively larger axial as well as tangential velocity compared to a single approach of swirling jet or round jet, enabling one to acquire a deeper oillet and expand the perforation area effectively. The simulation results substantiate the enormous potential of SR-SC-CO 2 in improving rock-breaking efficiency and clarify the influence of relevant parameters on the impact pressure of the jet flow.

Keywords: supercritical carbon dioxide; swirling-round jet; flow field; rock-breaking efficiency; impact pressure; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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