摘要：Swirling-round jet could highly improve rock erosion efficiency. Besides, supercritical carbon dioxide (SC-CO2) fluid is characterized by low rock breaking threshold pressure and high rock breaking rate. This paper proposes a new type of jet, called swirling-round SC-CO2jet. Rock breaking mechanism of swirling-round SC-CO2jet is studied by means of rock-erosion experiment and scanning electron microscope (SEM) observation. Standard cylinder sandstone cores were used for rock erosion experiment. Then, slices were cut off from these rock samples for SEM observation. Results show that the jet penetration efficiency of swirling-round SC-CO2jet is higher than that of round SC-CO2jet. SEM observation presents: numerous crystal particles are snapped; inter-crystalline rupture occurs, generating large number of micro fractures; shear failure of crystal particles appear widely. Therefore, the major rock breaking mechanisms of swirling-round SC-CO2jet are tensile and shear failure, while the breaking mechanism of round SC-CO2jet is tensile failure. For one thing, swirling-round SC-CO2breaks rock by combining axial impinging, radial tension and circumferential shear. For another, with characteristics of low viscosity, compressibility, strong diffusivity and permeability, numerous micro-fractures are caused by SC-CO2, and the existed fractures are expanded, led to fractures joining together and massive rocks split off.
© 2017 ARMA, American Rock Mechanics Association.

卷、期、页：v 2,p970-978

发表日期：2017-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：51st US Rock Mechanics / Geomechanics Symposium 2017

参与作者：贺振国

通讯作者：刘庆岭,李小江,吕泽昊

第一作者：田守嶒,盛茂,李根生,王海柱

论文类型：会议论文

论文概要：田守嶒,盛茂,刘庆岭,李根生,王海柱,李小江,吕泽昊,贺振国，Experiment and SEM analysis on rock breaking mechanism by swirling-round SC-CO2jet，51st US Rock Mechanics / Geomechanics Symposium 2017，2017，v 2,p970-978

论文题目：Experiment and SEM analysis on rock breaking mechanism by swirling-round SC-CO2jet