Volume 39 Issue 5
Jan.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(5): 638-645
LIU Hanbin, BAI Hao, TANG Meirong, et al.Study on viscoelastic sand-carrying mechanism and imbibition performance of nano variable-viscosity slickwater[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：638-645 doi: 10.12358/j.issn.1001-5620.2022.05.016
Citation: LIU Hanbin, BAI Hao, TANG Meirong, et al.Study on viscoelastic sand-carrying mechanism and imbibition performance of nano variable-viscosity slickwater[J]. Drilling Fluid & Completion Fluid，2022, 39（5）：638-645 doi: 10.12358/j.issn.1001-5620.2022.05.016
shu

Study on Viscoelastic Sand-carrying Mechanism and Imbibition Performance of Nano Variable-viscosity Slickwater

doi: 10.12358/j.issn.1001-5620.2022.05.016
  • 1.

    Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi’an, Shaanxi 710021

  • 2.

    Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249

  • 3.

    Changqing Chemical Group Co., Ltd., Xi’an, Shaanxi 710021

  • Received Date: 2022-03-15
  • Accepted Date: 2022-06-21
  • Rev Recd Date: 2022-04-11
  • Publish Date: 2023-01-10
    Abstract
  • As a new fracturing fluid system with good sand-carrying performance and imbibition displacement, nano variable-viscosity slickwater has been successfully applied to shale oil volume fracturing in Changqing Oilfield. The field test results show that it has good sand-carrying performance and stimulation effect. Under the condition of 40 % sand ratio, the pressure of sand adding process is stable, and the daily oil production of a single well can reach 11.31 tons after fracturing construction, but its sand-carrying mechanism and imbibition performance are not clear. In this paper, the laboratory experimental study on the field concentration of nano variable-viscosity slickwater and the conventional EM30S crosslinkable slickwater system is carried out. Through the experimental methods of dynamic sand-carrying migration, transmission electron microscope (TEM), rheological property evaluation, and pressurized imbibition under the condition of reservoir temperature and pressure, the sand-carrying mechanism of nano variable-viscosity slickwater is revealed and its imbibition performance is evaluated. The experimental results show that the intersection value of elastic modulus and viscous modulus of slickwater reflects the sand-carrying capacity of slickwater solution. The smaller the intersection value is, the stronger the elastic sand-carrying capacity is; Under the same viscosity, the intersection value of viscoelastic modulus of nano variable-viscosity slickwater CNI system is only 0.0741 Hz, which is far lower than 0.181 Hz of field slickwater EM30S, resulting in its static and dynamic elastic sand-carrying performance much higher than EM30S; TEM results show that the strengthening association structure between nano emulsion and variable-viscosity slickwater is the main reason for the enhancement of elastic sand-carrying performance of slickwater. In addition, the results of pressure imbibition experiment show that the nano variable-viscosity slickwater has good imbibition displacement performance, and can replace the crude oil in the nano pores of shale, and the overall recovery can reach 36%. Among them, the order of recovery efficiency of different pore types is: mesopore > micropore > macropore.

     

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