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Fracture Net Deliverability of Multistage Fractured for StressDependent Tight Sandstone Gas Reservoirs
Xu Xinyue, Xiao Chuantao, Xu Chen, Xu Dang, Mei Haolin
Stress sensitivity is one of the factors influencing fracture net deliverability of multistage fractured horizontal well for tight sandstone gas reservoirs. Based on seepage characteristic of tight sandstone gas reservoir, seepage law after fracturing work and steady seepage theory, flowing resistance method was used to derive fracture net deliverability correlation considering stress sensitivity of multistage fractured horizontal well for tight sandstone gas reservoirs, and then the correlation was used to analyze fracture parameters and stress sensitivity level on gas production rate. The results indicate that with increasing fracture flow conductivity and fracture net permeability, gas production is gradually increased, but the increase is slowed down. The unimpeded flow increases gradually with the increase of fracture half length, and increases rapidly with the increase of fracture conductivity. Therefore, in order to improve gas reservoir productivity, it is more significant to improve fracture halflength than fracture flow conductivity. The greater the stress sensitivity coefficient is, the greater the permeability decreases with the production, and the more the productivity of the gas well decreases.
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