Short-term interactions between Longmaxi shale and carbon dioxide-based fracturing fluids.

12 that after the interaction of different phases of CO 2 -brine-shale, the number of micropores and mesopores in the shale decreased and began to transform into macropores, so the macropores The proportion has increased; at the same time, the specific surface areas of micropores, mesopores and macropores all show a decreasing trend, which is in line with the changing trend of the total specific surface area of shale.

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The reduction degrees of micropore volume are: 6.06 % (deionized water conditions), 19.35 % (6 MPa CO 2 + brine), 54.29 % (10 MPa CO 2 + brine), 63.41 % (14 MPa CO 2 + brine); the same situation exists for the change pattern of mesopore volume, there is also a trend of becoming smaller, and the reduction range is 4.65 % (deionized water conditions), 17.78 % (6 MPa CO 2 + brine), 34.09 % (10 MPa CO 2 + brine), 41.67 % (14 MPa CO 2 + brine); while the large pores volume shows an increasing trend with the interaction of CO 2 - brine -shale, and the increasing amplitudes are 2.78 % (deionized water conditions), 9.46 % (6 MPa CO 2 + brine), 28.77 % (10 MPa CO 2 + brine), and 30.26 % (14 MPa CO 2 + brine), respectively.

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