Research and Application of Multi-scale Support Mechanism in Tight Gas Reservoir

doi:10.11885/j.issn.1674-5086.2022.02.23.01

Abstract

Abstract: Tight sandstone gas is an important unconventional natural gas resource, which requires fracturing to achieve effective development. In this paper, the tight sandstone outcrop cores in the Sichuan Basin are selected, and the rough fracture rock samples are carved to carry out multi-scale fracture conductivity and proppant backflow experiments, and analyze the influence of conductivity and proppant backflow. The results show that in order to obtain stable conductivity, the main fracture near the well needs to have enough proppant to provide a larger remaining fracture width, and only a small amount of small particle size proppant in the shear fracture of the far well can be effectively improved. For main fractures filled with proppant, the fracture conductivity has the critical closure stress and critical proppant concentration. Adding fibers to the proppant packing layer increases the sanding critical flow velocity by an order of magnitude, which can effectively prevent proppant backflow in fractures after fracturing. The multi-scale support concept of tight gas reservoirs has achieved significant stimulation effects in the fracturing engineering practice of tight gas reservoirs in the west Sichuan Depression of the Sichuan Basin, providing effective support and reference for the economical and efficient development of tight gas reservoirs.

Key words: tight gas, hydraulic fracturing, multi-scale support, rough fractures, conductivity, sand production

CLC Number:

TE343

CHEN Chi, GUO Jianchun, LU Qianli, CI Jianfa. Research and Application of Multi-scale Support Mechanism in Tight Gas Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(3): 131-138.

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