生物酶解堵增产研究与应用

Research and application of biological enzyme as plug remover for stimulation

为了解除重质组分污染和钻井滤液污染造成的储层堵塞,研究了当前常用的2种酶阿波罗酶和SUN酶的解堵性能,经过表观分析、稳定性研究、含菌分析实验、蛋白分析实验、糖组分分析、生物表面活性剂的分析实验、与原油界面张力的测定,认识了2种酶对岩石润湿性的改善、洗油作用、乳化原油能力以及解堵机理。模拟实验结果表明,2种酶均可不同程度地解除地层的重质组分堵塞,特别是用地层水配制的阿波罗酶解堵剂能有效地解除钻井滤液对地层造成的堵塞。介绍了生物酶解堵选井原则,矿场实施工艺方案、施工方案及效果评价,在处理半径1.8m、阿波罗酶溶液体积分数为4%条件下对海上油田2口油井已实施解堵,增产效果良好,值得类似油田借鉴。

In order to remove the formation blockage resulted from heavy component pollution and drilling fluid pollution, this paper studies the plug removal performance of two kinds of enzyme （Apollo and SUN） now widely used. Through the appearance analysis, stability study, analysis experiments about bacteria content, protein, sugar component and bio surfactant and interfacial tension measurement, we recognize the roles of two enzymes in improving rock wettability and sweeping oil, and their ability to emulsify crude oil and plug removal mechanism. Simulation experiment results demonstrate that two enzyme can release the heavy component blockage in different degree, especially the Apollo enzyme solution prepared with formation water can remove the formation blockage resulted from drilling fluid. The paper introduces the well selection principle of plug removal with biological enzyme, field operation technique scheme, operation scheme and effect evaluation. Plug removal operation was implemented in 2 oil wells of offshore oilfield in terms of 1.8m treatment radius of and 4% mass fraction of Apollo solution and the results of the reservoir stimulation are successful giving a reference to similar oilfield.