The Shunbei fault‐controlled reservoir fracture development has a strong stress sensitivity. With the extraction of oil and gas, the effective stress on fractures and the matrix rock increases, resulting in the gradual closure of the fractures, thus reducing the inflow capacity. Moreover, it is not easy to recover after the fractures are closed, which leads to a large amount of residual oil and gas in the matrix rock that cannot be exploited and reduces the oil and gas recovery rate. To address this issue, this paper carries out reservoir stress sensitive flow experiments to deeply investigate the influence of effective stress change on the permeability of different types of carbonate rock cores. The results show that the Shunbei area rock is dense. During pressure relief and pressurization, the rock permeability meets the power index change rule, followed by fracture closure and then pressurization. Its permeability cannot be fully recovered due to the plastic deformation of the rock; this phenomenon is consistent with the actual mine practice process of the reservoir collective changes. This study elucidates the closure characteristics of natural reservoir fractures under effective stress at deep conditions and their influence on reservoir exploitation. The results of the study are of practical significance for the exploitation of ultradeep, fault‐controlled, fractured‐vuggy carbonate reservoirs and their later transformation.
Xiao et al. (Thu,) studied this question.
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