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针对莫109井区三工河组储层特点以及前期试注和邻近区块注水井生产情况,对其采用振荡酸化的可行性进行了分析,室内研制出适合该区块注水井增注酸化体系及酸化工艺技术。由于该井区岩性致密,泵注过程中多次停泵,利用振荡挤酸技术对5口注水井进行酸化,酸化后直接转注,将残酸和二次污染推至地层深部,酸化后获得显著增注效果。现场应用表明,该工艺和酸液体系适合类似莫109井区三工河组储层注水井的改造,酸化后能有效降低注水压力,增注效果明显。
In view of the reservoir characteristics of Sangonghe Formation in Mo 109 and the pre-injection and production conditions of injection well in the adjacent block, the feasibility of using oscillating acidification was analyzed. The suitable injection system for injection wells in this block was developed indoors And acidification technology. Due to the tight lithology in the well area, the pump was stopped several times during the pumping process. Five injection wells were acidified by shaking acid-squeezing technique and directly transferred after acidification. The residual acid and secondary pollution were pushed into the deep part of the stratum and acidified Remarkably increase the effect. The field application shows that the process and the acid system are suitable for the reconstruction of the injection wells of the Sangonghe Formation in the No. 109 well area. After acidification, the water injection pressure can be effectively reduced, and the injection effect is obvious.