振荡-酸化深部复合解堵机理与应用

Mechanisms and applications of removing blockage with oscillating jet and acid

常规的物理及化学解堵方法虽然可以解除近井地带不同深度的杂质污染,但脱落的堵塞物(特别是酸化后形成的酸渣)难以返排出地层,从而影响解堵效果。针对这一问题,提出了适用于油水井的新型解堵工艺,其作业过程可分为两步:用酸液作为工作液,采用高效自振空化喷嘴,采用双振荡枪形成2组振源,在地层中的局部点叠加振动振幅,从而增强处理效果,实施深部复合解堵;下入封隔器,从环空泵入清水,清水流经地层带出杂质后再由油管排出井外,达到彻底清除地层污染的目的。该技术在胜利油田胜利采油厂注水井上现场应用了13井次,解堵增注效果十分显著。

Although the conventional blockage removal technology with physical or chemical methods can clean the damage of the formations near wellbore, it is difficult to drain impurities, especially the residue from acidization, out of the formations. The paper presents a novel technology with two steps; using two sets of guns （equipped with oscillating nozzles and blasting acid） as two oscillating sources, the overlapped vibration in the formations and the acid will loose and shed the bloekage; lowering a packer into the wellbore and pumping clean water from an annular pump, the water will flow into the formations and bring the impurities to the surface through well tubing. This technology was applied to 13 water injection wells in Shengli Oil Production Plant, Shengli Oilfield, and satisfactory results were achieved in removing blockage and enhancing water injection.