Application of supercritical water conditions to improve the flowback of fracturing fluid in ultra-low-permeability sandstone formations
Application of supercritical water conditions to improve the flowback of fracturing fluid in ultra-low-permeability sandstone formations
复制标题
应用超临界水条件改善超低渗透砂岩地层压裂液返排
DOI：
10.1016/j.expthermflusci.2020.110273
复制
发表时间：
2021-02
影响因子：
3.2
通讯作者：
Chen Mingjun
中科院分区：
文献类型：
--
作者：
Li Ying;Cui Xiaojiang;Li Haitao;Chen Shengnan;Chen Mingjun
水力压裂是特低渗透油藏增产的重要途径，但压裂液返排效率低，可能污染地下水，降低采收率。本研究通过实验研究了在超低渗透油藏中注入FF后通过实现超临界水（SCW）条件来提高水基FF的返排效率和石油产量的可能性。通过对毛细管压力、原油减粘、孔隙-裂缝分布和矿物组成的测定，探讨了可能的机理。结果表明，与常规水力压裂相比，超临界水条件处理后的FF返排效率平均提高10.2%，采收率平均提高19%。SCW条件处理后较低的毛细管压力表明较低的流动阻力。此外，在SCW条件处理后的压裂过程中，大孔隙比例的增加范围为6.6%至9.0%，而在RHF后，大孔隙的增加范围为2.8%至4.5%。超临界水条件处理后岩心孔隙度的增加分别为0.87%、1.08%和1.43%，明显高于RHF处理后的孔隙度增加值（分别为0.33%、0.24%和0.26%）。经超临界水条件处理后，岩石样品中高岭石的含量增加，而伊-蒙间层矿物的含量减少，从而提高了矿物在水中的稳定性。从SCW条件处理回收的油的比浓动力粘度和较轻组分揭示了原油的减粘裂化的发生。
Hydraulic fracturing is an important approach for stimulating the production of ultra-low-permeability oil reservoirs; however, the low flowback efficiency of the fracturing fluid (FF) may cause contamination of the groundwater and reduce oil recovery. This study experimentally investigates the possibility of improving the flowback efficiency of water-based FF and oil production through the achievement of supercritical water (SCW) conditions after the injection of FF in ultra-low-permeability oil reservoirs. Possible mechanisms are explored through measurement of the capillary pressure, visbreaking of oil, pore-fracture distribution, and mineral components. The results show that the FF flowback efficiency and oil recovery after the SCW condition treatment are an average of 10.2% and 19% higher than those after regular hydraulic fracturing (RHF), respectively. The lower capillary pressure after the SCW condition treatment indicates a lower flow resistance. Furthermore, the increase in the proportion of large pores ranges from 6.6% to 9.0% for the fracturing process after the SCW condition treatment, whereas the increase in large pores after RHF ranges from 2.8% to 4.5%. The increases in the porosity of the core samples after the SCW condition treatment are 0.87%, 1.08%, and 1.43%, which are markedly higher than those after RHF (0.33%, 0.24%, and 0.26%, respectively). The percentage of kaolinite in the rock samples increases, whereas that of interstratified illite–montmorillonite decreases after the SCW condition treatment, thus increasing the stability of the minerals in water. The reduced dynamic viscosity and lighter components of the recovered oil from the SCW condition treatment reveal the occurrence of visbreaking of the crude oil.
登录
查看更多内容
致密裂隙岩驱替过程中动态毛细管压力研究
影响因子：
3.7
作者：
Li Ying;Li Haitao;Chen Shengnan;Luo Hongwen;Liu Chang
通讯作者：
Liu Chang
DOI：
10.1088/1755-1315/272/3/032004
发表时间：
2019-06
期刊：
IOP Conference Series: Earth and Environmental Science
影响因子：
--
作者：
A. Gorshkov;Ilya Khomyakov
通讯作者：
A. Gorshkov;Ilya Khomyakov
DOI：
10.5593/sgem2019/1.2/s06.147
发表时间：
2019-06
期刊：
19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings19th, Science and Technologies in Geology, Exploration And Mining
影响因子：
--
作者：
R. Djimasbe
通讯作者：
R. Djimasbe
影响因子：
7.4
作者：
Ghanbari, Ebrahim;Dehghanpour, Hassan
通讯作者：
Dehghanpour, Hassan
DOI：
10.1111/1755-6724.13413
发表时间：
2017-10
期刊：
Acta Geologica Sinica ‐ English Edition
影响因子：
--
作者：
Zhi Yang;Qiyan Li;Songtao Wu;Senhu Lin;Xinshe Liu
通讯作者：
Zhi Yang;Qiyan Li;Songtao Wu;Senhu Lin;Xinshe Liu