榆林某气田注水井解堵方法研究  

Study on Blockage Removal Methods of Reinjection Wells in Yulin Gasfield

作　　者：王思中[1] 梁小兵 李毓枫 张吉磊[4] 

机构地区：[1]中国石油天然气集团公司办公厅,北京100007 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [3]长庆油田第四采油厂采油工艺研究所,陕西榆林718500 [4]西安石油大学石油工程学院,陕西西安710065

出　　处：《辽宁化工》2014年第7期905-907,共3页Liaoning Chemical Industry

摘　　要：针对榆林某气田注水井堵塞且盐酸解堵效率随施工次数的增加而降低,通过对回注罐罐底沉积物的组成分析,采用不同种类、不同浓度的酸液在不同溶解时间下,对回注罐罐底沉积物溶解实验来研究其原因和提出有效的解堵方案。结果表明:在地层温度(75℃)下,20%盐酸最大可溶解53.93%的回注罐罐底沉积物;土酸(12%HCl+12%HF)最大可溶解经盐酸溶解后的沉积物57.22%;2%ClO2最大可溶解18.95%。可见,后期近井地带堵塞物为长期累积的有机物和泥土,采用"先ClO2,后土酸"的联合解堵可有效解堵。Taking a blocked injection well in Yulin gas field as the research object, with increasing of construction frequency, the effect of HC1 acudizing to remove the blockage was not well. By component analysis of sediment at the bottom of reinjection tank and various kinds of acid soluble experiments of the sediment, the best way to solve the problem was found. The results shows that： when the formation temperature is 75 ℃, 20% HC1 can dissolve 53.93% the sediment; mud acid （12% HCl＋12%HF） can dissolve 57.22% the sediment treated by HC1; 2% C1O2 can dissolve 18.95% the sediment treated by HCl. The main components of stemming near wellbore zone are organics and clay, so the best acidizing system is C102＋mud acid.

关 键 词：解堵 回注井 罐底沉积物 

分 类 号：TE357[石油与天然气工程—油气田开发工程]