摘要：Supercritical carbon dioxide (SC-CO2) 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-CO2 (SR-SC-CO2) jet, is expected to substantially enhance rock-breaking efficiency. However, theoretical analysis of the flow field characteristics of SR-SC-CO2 has not been reported yet. This work aims to lay a theoretical foundation for employing SR-SC-CO2 in drilling and fracturing. The flow field is simulated using Naiver-Stokes equations and the RNG k-epsilon 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-CO2 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-CO2 in improving rock-breaking efficiency and clarify the influence of relevant parameters on the impact pressure of the jet flow.

关键字：supercritical carbon dioxide; swirling-round jet; flow field; rock-breaking efficiency; impact pressure; numerical simulation

ISSN号：1996-1073

卷、期、页：卷: 14; 期: 1; 页: 106

发表日期：2021-01-01

影响因子：2.702500

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：ENERGIES

参与作者：刘晗,毛蔚轩

第一作者：杨钰龙,宋兆杰,王海柱

论文类型：期刊论文

论文概要：杨钰龙,刘晗,毛蔚轩,宋兆杰,王海柱，Study on the Impact Pressure of Swirling-Round Supercritical CO2 Jet Flow and Its Influencing Factors，ENERGIES，2021，卷: 14; 期: 1; 页: 106

论文题目：Study on the Impact Pressure of Swirling-Round Supercritical CO2 Jet Flow and Its Influencing Factors