准噶尔盆地三台油气田侏罗系中—上统储层敏感性评价

Sensitivity evaluation on Middle and Upper Jurassic reservoir in Santai oil and gas field of Junggar Basin

准噶尔盆地三台油气田侏罗系中—上统储层含较高的蒙脱石和伊蒙混层矿物,造成了较强的储层敏感性。岩芯流动实验发现该区目的层段敏感性最强的是水敏,其次是碱敏。速敏、酸敏、盐敏相对较弱,但与国内其他油田相比仍然较强。对于不同储层,不同黏土稳定剂可能有不同的影响,有时甚至可能产生伤害,在研究区应严格筛选出合适的黏土稳定剂,应用于钻井液、完井液、射孔液和注入水中,减小储层的伤害。

There are some montmorillonite and illite-montmorillonite interstratified clay minerals in the reservoir, which made the reservoir sensitivity strong. The water sensitivity is the strongest in the target bed by core flow test, and secondly is alkali sensitivity. The flow rate sensitivity, acid sensitivity and salt sensitivity are weak correspondingly, which are, however, still stronger than other oilfields in China. There may be different affection to different clay inhibitor in different reservoir, sometimes there may be doing damage. The applicable clay inhibitor should be selected strictly in research area to apply in drill fluid, completion fluid, perforating fluid and flood water in order to decrease reservoir damage.