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油气田生产过程中,随着储层流体的不断流出,储层孔隙压力发生变化,岩石骨架应力重新分布,导致孔隙、喉道结构形态发生变化。这种岩石渗流结构空间的变化,直接反应在油藏的物性参数(孔隙度,渗透率的减小)发生变化,最终影响流体在储层中的流动。对于低渗透储层,如果生产制度不合理,生产压差过大,将导致在近井地带产生较强的再压实作用,不仅减小了孔隙体积和裂缝张开程度,而且会使细小喉道和微裂缝闭合,宏观上表现为储层物性的变差和油气向产量明显下降。故对应力敏感性损害机理研究能够为油气层保护工作提供合理依据。本文综合分析了不同物性、微裂缝等因素的所引起的应力敏感性伤害。
In the process of oil and gas field production, with the continual outflow of reservoir fluid, the pore pressure of reservoir changes, and the stress of rock skeleton is redistributed, resulting in the change of pore and throat structure. Changes in the spatial structure of the seepage structure of the rock, the direct reaction in the physical properties of the reservoir parameters (porosity, permeability reduction) changes, and ultimately affect the fluid flow in the reservoir. For low-permeability reservoirs, if the production system is unreasonable and the production pressure is too large, it will result in strong recompression in the near-well zone, which not only reduces the pore volume and crack opening degree, but also makes the small throat Road and micro-cracks closed, macroscopically, the reservoir physical properties of the deterioration and oil and gas production decreased significantly. Therefore, the mechanism of stress sensitivity damage can provide a reasonable basis for the protection of oil and gas reservoirs. This paper comprehensively analyzed the stress sensitivity damage caused by different physical properties, micro-cracks and other factors.