摘要
利用计算流体力学方法模拟了超临界CO2喷射压裂过程中的孔内流场,对比和分析了超临界CO2喷射压裂与水力喷射压裂的增压效果,并研究了各参数对超临界CO2喷射压裂增压效果的影响。研究结果表明:超临界CO2喷射压裂在相同条件下具有比水力喷射压裂更强的孔内增压效果,在喷嘴压降为30 MPa时,其增压值比水力喷射压裂高2.4 MPa;超临界CO2喷射压裂的孔内增压值随着喷嘴压降和喷嘴直径的增大而增大,随着套管孔径的增大而减小,且不受环空压力和超临界CO2流体温度的影响。
In order to verify the feasibility of Supercritical C（）2 jet fracturing and uncover its pressure boost capability, this research simulated flow fields within cavity of Supercritical C02 jet fracturing with compatational fluid dynamics method, compared the pressure boost effect of Supercritical CO2 }et fracturing with that of the water jet fracturing, and analyzed the influences of various parameters on the pressure boost effect ofSupercriticalC（）2 iet fracturing. The results indicated that SupercriticalCO2 iet fractu- ring has a stronger pressure boost effect than water jet fracturing under the same conditions. When the nozzle pressure drops to 30 MPa, the boost pressure of SupercriticalC（）2 jet fracturing is 2. 4MPa higher than that of water jet fracturing. Moreover, the boost pressure of Supercritical C（）2 iet fracturing increases with increasing nozzle pressure and increasing nozzle diameter but de- creases with increasing inner casing diameter, and it is not affected by the annulus pressure and the temperature of Supercritical CO2 fluid.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第3期550-555,共6页
Acta Petrolei Sinica
基金
国家自然科学基金重点项目(No.51034007)和国家自然科学基金国际(地区)合作与交流项目(No.51210006)资助
关键词
超临界流体
二氧化碳
喷射
压裂
增压
数值模拟
supercritical fluid
carbon dioxide
jet
fracturing
boost pressure
numerical simulation
