Multi-layer commingled production is the main feature of gas well development in Sulige tight sandstone gas reservoirs, Ordos Basin. Whether there is interference between layers and how to characterize them are important issues for effective development of gas reservoir. The physical simulation experiment process and scheme of interlayer commingled mining with fracture communication are designed, and the development simulation experiment of different interlayer combination modes is carried out. The results show that in the process of multi-layer commingled production of tight gas and water layers, whether it is only gas layers production or gas and water layers production at the same time, there is a common phenomenon of cross flow of gas and water between layers, resulting in interlayer interference and reducing the recovery of gas reservoirs. Based on this, the concept of interlayer interference index in multi-layer commingled production in tight sandstone gas reservoirs is proposed, and the interference index model is obtained by fitting the multiple linear regression method. The interference index is related to the physical properties of the reservoir. High water saturation and great permeability ratio of water layer to gas layer (greater than the critical value 1) can result in the early occurring of interlayer interference and great interference index. Finally, based on the interference index model, a new method for productivity evaluation of gas wells in tight gas reservoirs is established. The calculation results show that the interference index curve can effectively describe the interlayer interference performance of gas wells. The productivity and production performance of gas wells calculated by the productivity evaluation method based on the interference index model are consistent with the production history, which proves the effectiveness and accuracy of the interference index model. Therefore, the interference index model can effectively predict the productivity and production performance of gas wells in Sulige tight sandstone gas reservoir. The research results have important theoretical guidance and practical significance for the efficient development of Sulige tight sandstone gas reservoir.
Keywords:Tight sandstone gas reservoir
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Reservoir physical parameters
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Multi-layer commingled production
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Cross flow of gas and water between layers
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Interference index
LIU Huaxun, GAO Shusheng, LI Xiaogang, LI Qi, ZHU Wentao, JIAO Chunyan, YE Liyou, AN Weiguo, ZHU Wenqing. Model of cross-flow interference index and application for multi-layer commingled production in Sulige tight sandstone gas reservoir, Ordos Basin. Natural Gas Geoscience[J], 2023, 34(6): 950-962 doi:10.11764/j.issn.1672-1926.2022.12.014
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