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通过岩心流动等实验,分析了杏南开发区表外储层压力敏感性及对开发效果的影响。结果表明,渗透率损失主要发生在净围压增大的初期阶段,净围压达到35M Pa时,渗透率损失为25.09%~61.98%,属于弱-中等偏强压力敏感性。净围压减小,岩样渗透率增加,但渗透率不能恢复到原来的状态,压敏所产生的伤害是永久性且不可逆的。因此,在采油时必须适当地控制生产压差,采取注水等措施,避免由于净围压的增大导致渗透率降低,影响开采效果。
Based on the experiment of core flow and so on, the sensitivity of off-table reservoir pressure in Xingnan Development Zone and its influence on development effectiveness were analyzed. The results show that the loss of permeability mainly occurs in the initial stage when the net confining pressure increases. When the net confining pressure reaches 35MPa, the permeability loss is 25.09% ~ 61.98%, which belongs to the weak - moderately strong pressure sensitivity. Net confining pressure decreases, rock permeability increases, but the permeability can not be restored to its original state, the damage caused by pressure-sensitive is permanent and irreversible. Therefore, oil production must be properly controlled production pressure, water injection and other measures to avoid the increase due to the net confining pressure caused by lower permeability, affecting the mining effect.