Research of Improving Water Injection Effect by Using Active SiO₂ Nano-Powder in the Low-Permeability Oilfield

Abstract:

SiO2 nano-powder is a new type of augmented injection agent, has the ability of stronger hydrophobicity and lipophilicity, and can be adsorbed on the rock surface so that it changes the rock wettability. It can expand the pore radius effectively, reduce the flow resistance of injected water in the pores, enhance water permeability, reduce injection pressure and augment injection rate. Using artificial cores which simulated geologic conditions of a certain factory of Daqing oilfield, decompression and augmented injection experiments of SiO2 nano-powder were performed after waterflooding, best injection volume of SiO2 nano-powder under the low-permeability condition was selected. It has shown that SiO2 nano-powder inverted the rock wettability from hydrophilicity to hydrophobicity. Oil recovery was further enhanced after waterflooding. With the injection pore volume increasing, the recovery and decompression rate of SiO2 nano-powder displacement increased gradually. The best injected pore volume and injection concentration is respectively 0.6PV and 0.5%, the corresponding value of EOR is 6.84% and decompression rate is 52.78%. According to the field tests, it is shown that, in the low-permeability oilfield, the augmented injection technology of SiO2 nano-powder could enhance water injectivity of injection wells and reduce injection pressure. Consequently, it is an effective method to resolve injection problems for the low-permeability oilfield.

• Periodical: Advanced Materials Research (Volume 92)
• Pages: 207-212
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.92.207
• Online since: January 2010
• Authors: Ke Liang Wang, Shou Cheng Liang, Cui Cui Wang
• Keywords: Decompression and Augmented Injection, EOR, Oilfield Test, SiO₂ Nano-Powder, Wettability

References

[1] Gao Ruimin: Research of improving oilfield injection technology using active SiO2 nano-powder. Oilfield Chemistry, 2004, 21(3): 248-250.

[2] Su Xiantao, Luan Zhian, Lv Guangzhong, et al: Application of nanometer polysilicon in oil field development. Oil Drilling & Production Technology, 2002, 24(3): 48-510.

[3] Yang Lingxin, Guo Wenjun, Xu Yanwei, et al: Application of decompression and augmented injection technology of poly silicon nano-materials at Wendong Oilfield. Jianghan Petroleum Institute Journal, 2003, 25(Supplement): 105-106.

[4] Yi Hua , Sun Honghai , Li Feixue , et al: Decompression and augmented injection theories research of nanometer polesilicon in oilfleld water flood development. Natural Science Journal of Harbin Normal University, 2005, 21(6): 66-69.

[5] Di Qinfeng, Gu Chunyuan, Shi Liyi, et al: Pressure Drop Mechanism of Enhancing Water Injection Technology with Hydrophobicity )anometer SiO2. Drilling & Production Technology, 2007, 30(4): 91-94.

[6] Ju Binshan, Dai Shugao, Luan Zhian et al: A study of wettability and permeability change caused by adsorption of manometer structured polysilicon on the surface of porous media. SPE 77938.

DOI: 10.2118/77938-ms

[7] Xu Guocai, Zhang Lide: )anocomposites. Beijing: Chemical Industry Press, (2002).

[8] Huang Yanzhang: Fluid flow mechanism of low permeability reservoirs. Beijing: Chemical Industry Press, (1998).

[9] Li Daopin: Fluid flow mechanism of low permeability reservoirs. Beijing: Chemical Industry Press, (1999).

[10] Hu Bozhong: Technology of the synergistic development of low permeability reservoirs. Beijing: Chemical Industry Press, (1998).

[11] YAO Yuedong, Ge Jiali, Wei Junzhi, et al: Study on the fluid flow in low permeability reservoir. Petroleum Exploration and Development, 2001, 28(4): 73-75.