中高含水油井酸化分流控水化学微粒研究  

Diversion Acidizing and Splitting Water Chemical Particles in Medium and High Water Cut Oil Wells

作　　者：杨明 周泓宇 万小进 程利民 何瑜宁 YANG Ming;ZHOU Hong-yu;WAN Xiao-jin;CHENG Li-min;HE Yu-ning(CNOOC Hainan Branch,Haikou 570312,Hainan,China;CNOOC Zhanjiang Branch,Zhanjiang 524057,Guangdong,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《承德石油高等专科学校学报》2022年第6期19-25,31,共8页Journal of Chengde Petroleum College

基　　金：中海石油(中国)有限公司综合科研项目(南海西部在生产油气田提高采收率技术研究):CNOOCKJ135ZDXM38ZJ01ZJ。

摘　　要：针对储层纵向非均质性强、层间矛盾突出的中高含水油井,笼统酸化易导致进酸不均、层间矛盾加剧、含水率进一步上升的问题,研究出一种分流效率高、耐冲刷性强、且对地层伤害小的选择性化学微粒。该化学微粒配合酸化作业,实现酸液分流的同时对高渗水流通道具有一定封堵作用,起到解堵控水双重效果。以我国南海西部油田某中高含水储层为研究对象,针对目标储层孔喉分布,优化设计化学微粒粒径,并基于并联岩心流动实验开展分流效率评价。评价结果表明:该化学微粒在油中完全溶解而在水和酸中呈惰性,随原油产出自解除率高且施工简便,优选出的Ⅲ号粒径化学微粒(120~170目)并联岩心分流效率达91.4%。现场应用,增油45 m3/d,含水率下降29%。In medium and high water cut oil wells with strong vertical heterogeneity and prominent interlayer contradiction, the general acidizing process can easily lead to uneven acidizing, aggravated interlayer contradiction and further increase of water cut. To solve these problems, a selective chemical particle is developed, which has high flow separation efficiency, strong erosion resistance and low reservoir damage. The chemical particles cooperate with acidification operation to ensure that the acid and liquid are separated and high seepage water circulation channel is blocked at the same time. A medium and high water cut reservoir in western oilfields of South China Sea is taken as the research object in the study. According to the pore throat distribution of the target reservoir, the chemical particle size is optimized, and the evaluation of flow efficiency is carried out based on the parallel core flow experiment. The results show that chemical particles are completely dissolved in oil and are inert in water and acid, and with the increase of crude oil production, the removal rate is high and the construction is simple. The optimized chemical particle Ⅲ(120 ~ 170 mesh) parallel core has a diversion efficiency of 91. 4%. Field application shows that the oil production is increased by 45 m~3/d and the water cut is reduced by 29%.

关 键 词：中高含水油井 非均质性 化学微粒 分流酸化 控水 

分 类 号：TE357[石油与天然气工程—油气田开发工程]