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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

The Influence of Temperature on the Impact Characteristics of a Supercritical CO2 Jet

DOI: 10.1615/TFESC1.fnd.012968
pages 1171-1179

Haizhu Wang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China

Gensheng Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China

Zhenguo He
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Shouceng Tian
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

Zhonghou Shen
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum 102249, Beijing, People's Republic of China


KEY WORDS: Supercritical CO2, Jet, Impact Pressure, Temperature, Rock Breaking

Abstract

The supercritical carbon dioxide (SC-CO2) drilling is an emerging technique for the exploit of the shale reservoir. The primary advantage is that higher rate of penetration could be achieved, as the threshold pressure of rock breaking with SC-CO2 is lower than that of water jet, thus, Temperature is regarded as one of the most important factors for the characteristics of the SC-CO2 fluid. Changing temperature can lead to the changes of density, viscosity, diffusivity and other physical properties of the SC-CO2, and then the impact behavior of SC-CO2 jet. To investigate the effects, studies on the impact pressure and rock-breaking performance were carried out through comprehensive methods of numerical simulation and laboratory experiment. The results show that, as temperature goes up, the velocity of the jet is increasing while the impact pressure is decreasing slightly. The velocity will be around 5% larger while the impact pressure is 3% smaller for each rise of 20°. The eroded depth on the rock core samples increases with the rising temperature of the SC-CO2 from 313K to 363K. The reason lies in the fact that the density and viscosity of SC-CO2 fluid are getting smaller as temperature becomes higher, thus it is helpful to reduce the resistance acting on the fluid caused by the viscous effect while the impact pressure shows no change. Then the fluid is easier to the deep pores and penetrate the rock substance and finally improve the rock-breaking efficiency.

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