A Thermal-Fluid-Solid Coupling Computation Model of Initiation Pressure Using Supercritical Carbon Dioxide Fracturing

被引：0

作者：

Chen, Yi ^{[1
,2
,3
]}

Kang, Zhihong ^{[1
]}

Kang, Yuzhu ^{[4
]}

Chen, Xiaocheng ^{[5
]}

Chen, Xiaohong ^{[6
,7
]}

Fan, Qingteng ^{[8
]}

Du, Yukun ^{[6
,7
]}

Wang, Jinguang ^{[9
]}

机构：

[1] China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China

[2] China Geol Survey, Oil & Gas Survey, Beijing 100029, Peoples R China

[3] China Geol Survey, Key Lab Unconvent Oil & Gas, Beijing 100029, Peoples R China

[4] SINOPEC, Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China

[5] China Met Geol Bur, Qingdao Geol Explorat Inst, Qingdao 266000, Peoples R China

[6] Minist Educ, Key Lab Unconvent Oil & Gas Dev, Qingdao 266580, Peoples R China

[7] China Univ Petr, Sch Petr Engn, Qingdao 266580, Peoples R China

[8] CRRC Qingdao Sifang Rolling Stock Res Inst Co Ltd, Qingdao 266000, Peoples R China

[9] 4 Drilling Co Daqing Drilling Engn Co, Daqing 163000, Peoples R China

来源：

PROCESSES | 2023年 / 11卷 / 02期

基金：

中国国家自然科学基金;

关键词：

SC-CO2; hydraulic fracturing; initiation pressure; tangential stress; thermal-fluid-solid coupling; CO2; PROPAGATION; COAL;

D O I：

10.3390/pr11020437

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

With the characteristics of low fracturing pressure, little damage to the reservoirs, and assuming the role of carbon storage, supercritical carbon dioxide (SC-CO2) fracturing is suitable for the development of unconventional oil and gas resources. Based on the tensile failure mechanism of rocks, this paper establishes a thermal-fluid-solid coupling initiation pressure model for SC-CO2 fracturing. Using this model, the changes in formation temperature and pore pressure near a wellbore caused by invasion of CO2 into the formation are analyzed, as well as the impact of these changes on the tangential stress of reservoir rocks. The field data of SC-CO2 fracturing in a sandstone gas well are used to validate the reliability of the model. The results show that SC-CO2 fracturing can significantly reduce the initiation pressure, which decreases with the increase in fracturing fluid injection rate. The minimum value of tangential stress is located at the well wall, and the direction of tangential stress caused by formation temperature and pore pressure is opposite, with the former greater than the latter. The increase in Poisson's ratio, the increase in elastic modulus and the decrease in bottom hole temperature can reduce the initial fracturing pressure of the reservoir. The computation model established in this paper provides an effective method for understanding the reservoir fracturing mechanism under the condition of SC-CO2 invasion.

引用

页数：14