Pressure boost mechanism within cavity of the supercritical CO2 jet fracturing

doi:10.7623/syxb201303020

Editorial office of ACTA PETROLEI SINICA ›› 2013, Vol. 34 ›› Issue (3): 550-555.DOI: 10.7623/syxb201303020

• Petroleum Engineering • Previous Articles Next Articles

Pressure boost mechanism within cavity of the supercritical CO₂ jet fracturing

CHENG Yuxiong, LI Gensheng, WANG Haizhu, SHEN Zhonghou, HUANG Zhongwei, SONG Xianzhi

State Key Laboratory of Petroleum Resource & Prospecting, China University of Petroleum, Beijing 102249, China

Received:2012-11-12 Revised:2013-01-22 Online:2013-05-25 Published:2013-04-09

超临界CO₂喷射压裂孔内增压机理

程宇雄, 李根生, 王海柱, 沈忠厚, 黄中伟, 宋先知

中国石油大学油气资源与探测国家重点实验室北京 102249

通讯作者: 李根生
作者简介:程宇雄,男,1987年6月生,2006年毕业于中国石油大学(华东)石油工程专业,现为中国石油大学(北京)博士研究生,主要从事超临界二氧化碳钻完井基础理论研究。Email:chengyuxiong@126.com
基金资助:
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。

Abstract

Abstract:

In order to verify the feasibility of Supercritical CO₂ jet fracturing and uncover its pressure boost capability, this research simulated flow fields within cavity of Supercritical CO₂ jet fracturing with compatational fluid dynamics method, compared the pressure boost effect of Supercritical CO₂ jet fracturing with that of the water jet fracturing, and analyzed the influences of various parameters on the pressure boost effect of Supercritical CO₂ jet fracturing. The results indicated that Supercritical CO₂ jet fracturing 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 Supercritical CO₂ jet fracturing is 2.4 MPa higher than that of water jet fracturing. Moreover, the boost pressure of Supercritical CO₂ jet fracturing increases with increasing nozzle pressure and increasing nozzle diameter but decreases with increasing inner casing diameter, and it is not affected by the annulus pressure and the temperature of Supercritical CO₂ fluid.

Key words: supercritical fluid, carbon dioxide, jet, fracturing, boost pressure, numerical simulation

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。

关键词: 超临界流体, 二氧化碳, 喷射, 压裂, 增压, 数值模拟

CLC Number:

TE357

CHENG Yuxiong, LI Gensheng, WANG Haizhu, SHEN Zhonghou, HUANG Zhongwei, SONG Xianzhi. Pressure boost mechanism within cavity of the supercritical CO₂ jet fracturing[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(3): 550-555.

程宇雄, 李根生, 王海柱, 沈忠厚, 黄中伟, 宋先知. 超临界CO₂喷射压裂孔内增压机理[J]. 石油学报, 2013, 34(3): 550-555.

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Pressure boost mechanism within cavity of the supercritical CO₂ jet fracturing

超临界CO₂喷射压裂孔内增压机理

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