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针对渤海LD10-1油藏减缓吸液剖面反转技术需求,通过层内非均质岩心驱替实验,发现Cr~(3+)聚合物凝胶与水交替注入工艺具有较好的增油降水效果,运用并联岩心驱替实验,从驱替过程和驱油效果两方面探讨了交替注入增油机理。结果表明,相比整体凝胶段塞注入工艺,“Cr~(3+)聚合物凝胶+水”交替注入方式具有更好的封堵和驱替效应。凝胶前置段塞对高渗透层实施封堵后,后续水段塞一方面可使弱凝胶分子线团膨胀加强封堵效果,改善后续流体的转向能力,另一方面还可增强驱替效果,减缓吸液剖面反转现象。在实际设计交替轮次数时,应考虑水段塞过多易引起高渗透层突进的问题。
According to the requirement of reversing the absorbing profile reversal technology of Bohai LD10-1 reservoir, through the in-bed heterogeneous core flooding experiment, it is found that the Cr 3+ polymer gel has the better performance of increasing oil precipitation Effect, the use of parallel core flooding experiments, from the displacement process and flooding effect of two aspects of alternating injection mechanism to enhance oil. The results show that, compared with the whole gel slug injection process, the “Cr ~ (3+) polymer gel + water” alternative injection method has better plugging and displacement effects. Gel pre-plug on the high permeable layer after the plugging, the subsequent water slug on the one hand, the weak gel molecular coil expansion can enhance the blocking effect to improve follow-up fluid steering ability, but also can enhance the displacement Effect, slow down the absorption profile reversal phenomenon. In the actual design of alternate rounds, should consider the water section plug too easily lead to the problem of sudden penetration of high permeability layer.