SJ低渗气藏反凝析污染评价实验研究

EXPERIMENTAL STUDY ON RETROGRADE CONDENSATE POLLUTION EVALUATION OF SJ LOW PERMEABILITY GAS RESERVOIR

在生产过程中,SJ低渗凝析气藏已经出现一定程度的反凝析污染和堵塞,为研究反凝析污染伤害机理,通过定容衰竭(CVD)实验进行相应的反凝析污染评价实验。根据SJ气藏现场PVT资料配制地层凝析气样品,通过PVT仪进行高压物性分析实验,选用3组未造缝长岩心和3组造缝长岩心进行岩心单独衰竭实验,并进行相应的衰竭实验来模拟近井区和远井区凝析油污染,对比测定气测渗透率下降幅度,分析不同岩心的反凝析污染程度,进行SJ低渗气藏反凝析污染评价,对该气藏的高效开发具有重要指导意义。

In the production process,SJ low-permeability condensate gas reservoirs have already experienced some degree of anti-condensation pollution and blockages.In order to study the mechanism of damage of anticondensation pollution,a corresponding anti-condensation pollution evaluation experiment was performed through a constant volume exhaustion(CVD)experiment.The formation condensate gas samples were prepared based on the PVT data of the SJ gas reservoir.The high-pressure physical property analysis experiments were performed by the PVT instrument.Simulate the condensate oil pollution in the near and far well areas,compare the measured gas permeability and permeability decline,analyze the degree of anti-condensation pollution in dif⁃ferent cores,and evaluate the anti-condensation pollution in SJ low-permeability gas reservoirs.Development has important guiding significance.