Laboratory experiment on a toluene-polydimethyl silicone thickened supercritical carbon dioxide fracturing fluid

Mingyong Du, Xin Sun, Caili Dai, Hao Li, Tao Wang, Zhongliang Xu, Mingwei Zhao, Baoshan Guan, Ping Liu

    Research output: Contribution to journalArticle

    Abstract

    Supercritical carbon dioxide (SCCO2) fracturing fluid is an excellent application in CO2 re-use. It has many advantages than water-based fracturing fluids. However, the low viscosity hinders its application in unconventional oil and gas reservoirs. Therefore, we tried to improve the property of SCCO2 fracturing fluid by increasing the viscosity. A thickened SCCO2 fracturing fluid was constructed and the fracturing property of the fracturing fluid was investigated. The fracturing fluid consisted of toluene (cosolvent), polydimethyl silicone (thickener) and SCCO2. In SCCO2, toluene and polydimethyl silicone obtain low miscible pressure at 42 °C. In addition, the constructed fracturing fluid system obtains higher viscosity value (as high as 1.5 mPa·s), which can be 40 times high than the viscosity of pure SCCO2 at 42 °C and 20 MPa. These features match the viscosity requirement as a fracturing fluid. Molecular dynamics (MD) simulations were carried out to study the solubility parameter of the fracturing fluid system in molecular level. These MD simulation results show that, as a cosolvent, toluene helps polydimethyl silicon dissolve in SCCO2, which is consistent with laboratory experiment results. Moreover, the studied fracturing fluid obtains good properties as a fracturing fluid in terms of high proppant carrying capability, low fluid leakoff coefficient, and low formation damage rate.

    LanguageEnglish
    Pages369-374
    Number of pages6
    JournalJournal of Petroleum Science and Engineering
    Volume166
    DOIs
    StatePublished - 1 Jul 2018

    Fingerprint

    Fracturing fluids
    Silicones
    toluene
    Toluene
    Carbon dioxide
    carbon dioxide
    fluid
    Experiments
    viscosity
    Viscosity
    Molecular dynamics
    laboratory experiment
    Fracturing (fossil fuel deposits)
    Proppants
    Computer simulation
    silicon
    simulation
    low pressure
    Solubility
    solubility

    Cite this

    Du, Mingyong ; Sun, Xin ; Dai, Caili ; Li, Hao ; Wang, Tao ; Xu, Zhongliang ; Zhao, Mingwei ; Guan, Baoshan ; Liu, Ping. / Laboratory experiment on a toluene-polydimethyl silicone thickened supercritical carbon dioxide fracturing fluid. In: Journal of Petroleum Science and Engineering. 2018 ; Vol. 166. pp. 369-374
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    abstract = "Supercritical carbon dioxide (SCCO2) fracturing fluid is an excellent application in CO2 re-use. It has many advantages than water-based fracturing fluids. However, the low viscosity hinders its application in unconventional oil and gas reservoirs. Therefore, we tried to improve the property of SCCO2 fracturing fluid by increasing the viscosity. A thickened SCCO2 fracturing fluid was constructed and the fracturing property of the fracturing fluid was investigated. The fracturing fluid consisted of toluene (cosolvent), polydimethyl silicone (thickener) and SCCO2. In SCCO2, toluene and polydimethyl silicone obtain low miscible pressure at 42 °C. In addition, the constructed fracturing fluid system obtains higher viscosity value (as high as 1.5 mPa·s), which can be 40 times high than the viscosity of pure SCCO2 at 42 °C and 20 MPa. These features match the viscosity requirement as a fracturing fluid. Molecular dynamics (MD) simulations were carried out to study the solubility parameter of the fracturing fluid system in molecular level. These MD simulation results show that, as a cosolvent, toluene helps polydimethyl silicon dissolve in SCCO2, which is consistent with laboratory experiment results. Moreover, the studied fracturing fluid obtains good properties as a fracturing fluid in terms of high proppant carrying capability, low fluid leakoff coefficient, and low formation damage rate.",
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    Laboratory experiment on a toluene-polydimethyl silicone thickened supercritical carbon dioxide fracturing fluid. / Du, Mingyong; Sun, Xin; Dai, Caili; Li, Hao; Wang, Tao; Xu, Zhongliang; Zhao, Mingwei; Guan, Baoshan; Liu, Ping.

    In: Journal of Petroleum Science and Engineering, Vol. 166, 01.07.2018, p. 369-374.

    Research output: Contribution to journalArticle

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    T1 - Laboratory experiment on a toluene-polydimethyl silicone thickened supercritical carbon dioxide fracturing fluid

    AU - Du,Mingyong

    AU - Sun,Xin

    AU - Dai,Caili

    AU - Li,Hao

    AU - Wang,Tao

    AU - Xu,Zhongliang

    AU - Zhao,Mingwei

    AU - Guan,Baoshan

    AU - Liu,Ping

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    AB - Supercritical carbon dioxide (SCCO2) fracturing fluid is an excellent application in CO2 re-use. It has many advantages than water-based fracturing fluids. However, the low viscosity hinders its application in unconventional oil and gas reservoirs. Therefore, we tried to improve the property of SCCO2 fracturing fluid by increasing the viscosity. A thickened SCCO2 fracturing fluid was constructed and the fracturing property of the fracturing fluid was investigated. The fracturing fluid consisted of toluene (cosolvent), polydimethyl silicone (thickener) and SCCO2. In SCCO2, toluene and polydimethyl silicone obtain low miscible pressure at 42 °C. In addition, the constructed fracturing fluid system obtains higher viscosity value (as high as 1.5 mPa·s), which can be 40 times high than the viscosity of pure SCCO2 at 42 °C and 20 MPa. These features match the viscosity requirement as a fracturing fluid. Molecular dynamics (MD) simulations were carried out to study the solubility parameter of the fracturing fluid system in molecular level. These MD simulation results show that, as a cosolvent, toluene helps polydimethyl silicon dissolve in SCCO2, which is consistent with laboratory experiment results. Moreover, the studied fracturing fluid obtains good properties as a fracturing fluid in terms of high proppant carrying capability, low fluid leakoff coefficient, and low formation damage rate.

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    KW - Molecular dynamics simulation

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