镇北油田致密储层注水井复合酸化技术

发布时间：2018-08-16 10:48

【摘要】：镇北油田存在常规酸化注水井注入压力高,二次沉淀严重问题。针对长庆镇北油田复杂岩性地层的特征和以往注水井酸化效果,进行解堵方案分析,拓展复合酸化技术在注水井中的应用,研究适应长3、长8储层的酸化液配方,并通过模拟程序"顶替液→油田回注水→前置酸→主体酸→后置酸→顶替液"进行评价。结果表明,注入水和前置液都会对岩心渗透性造成伤害,主体酸可以对岩心中的部分可溶矿物进行溶蚀,与注入水中的微粒等发生反应,使得岩心的渗透性得到较好的恢复和提高,后置酸液通过维持体系p H值防止二次沉淀发生。矿场应用表明,酸化解除了储层伤害,3口试验井酸化过程中施工压力明显降低,降压幅度明显高于以往酸化井,取得较好的酸化效果。
[Abstract]:In Zhenbei Oilfield, the injection pressure of conventional acidified injection wells is high and the secondary precipitation is serious. In view of the characteristics of complex lithologic formations in Changqingzhen North Oilfield and the acidizing effect of water injection wells in the past, the plugging removal scheme was analyzed, the application of compound acidizing technology in water injection wells was expanded, and the acidizing fluid formula adapted to Chang 3 and Chang 8 reservoirs was studied. The evaluation was carried out by the simulation program "replacing the main body of acid with acid in the back water injection of oil field." The results show that the injected water and the pre-solution can damage the permeability of the core, and the host acid can dissolve some soluble minerals in the core and react with the particles in the injected water. The permeability of the core was improved and the secondary precipitation was prevented by maintaining the pH value of the system. The field application shows that acidizing relieves the reservoir damage in 3 test wells during acidizing, and the operating pressure is obviously reduced, and the pressure lowering range is obviously higher than that of the previous acidified wells, and good acidizing effect has been obtained.
【作者单位】：中国石油大学(北京)提高采收率研究院;
【基金】：中国石油天然气股份公司重大科技专项“长庆油田油气当量上产5 000万吨关键技术研究—采油采气关键技术研究”(2011E-2602-2)
【分类号】：TE357.2

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