双分支水平井酸化技术在碳酸盐岩储层中的应用  

Application of acidizing in bi-lateral horizontal well in carbonate reservoir

作　　者：张合文[1] 丁云宏[2] 赫安乐[2] 李俊波 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]阿克纠宾油气股份公司,哈萨克斯坦阿克纠宾030000

出　　处：《石油钻采工艺》2014年第4期84-87,共4页Oil Drilling & Production Technology

摘　　要：为了扩大单井控制面积,提高储层动用程度,增加单井产量,在哈萨克斯坦K油田进行了一口双分支水平井两分支分别酸化措施后合采的先导性试验。根据该油田储层、岩性和物性特征,确定了与储层配伍性较好且具有自转向功能、储层污染小的清洁自转向酸体系作为主体酸。为了达到提高水平段均匀改造程度和后期快速返排的目的,使用了氮气暂堵技术和液氮暂堵技术,并对施工压力、排量、连续油管拖动速度等参数进行了优化。酸化后分析表明,两个分支都起到了酸化解堵、恢复产能的目的,且单支产量与其邻井产量相当,说明双分支水平井酸化工艺在该油田具有较好的应用效果。In order to increase single well control area, producing degree and production of single well, a pilot test of bi-lateralhorizontal well acidizing was conduced in K oilfield, Kazakhstan. First, clean self-diverting-acid system was chosen as the main acid,which has self-diverting and little formation pollution, based on the characteristics of the reservoir, lithology and physical properties ofthis oilfield. Besides, nitrogen and liquid nitrogen were used to temporarily block high permeability layers and make the acidizing moreuniform. They can also accelerate flowing back velocity of residual acid. Treating pressure, pumping rate, and coiled tubing drawbackvelocity were optimized. The analysis after acidizing shows that acidizing worked in plugging removal and productivity restoration inboth branches, and the production of single branch equals to its neighbour well separately. This means that bi-lateral horizontal wellacidizing can get good application effect in this oilfield.

关 键 词：碳酸盐岩 双分支 水平井 自转向酸 暂堵 

分 类 号：TE357[石油与天然气工程—油气田开发工程]