准东吉7井区注水井酸化预处理防膨技术  

Anti-Swelling Technology for Acidizing Pretreatment in Water Injection Wells in Wellblock Ji 7,Zhundong Oilfield

作　　者：谢建勇[1] 石彦[1] 罗鸿成 李文波[1] 谢俊辉 XIE Jianyong;SHI Yan;LUO Hongcheng;LI Wenbo;XIE Junhui(Zhundong Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Fukang, Xinjiang 831511, China)

机构地区：[1]中国石油新疆油田分公司准东采油厂,新疆阜康831511

出　　处：《新疆石油地质》2017年第4期466-469,共4页Xinjiang Petroleum Geology

摘　　要：水敏性油藏在注水开发中,黏土矿物膨胀是导致储集层渗透率下降、注水压力上升的主要原因。对于低渗透储集层而言,即使加入防膨剂来抑制黏土矿物膨胀,减轻对渗透率的伤害,仍会发生注水压力上升,出现欠注甚至无法注水的现象。为实现长期有效注水,以吉7井区为例,开展了水敏储集层酸化预处理防膨技术研究。与无机和有机2类防膨剂相比,采用酸化预处理,渗透率损失率最小,防膨效果的持久性和稳定性最好。选取了储集层类似的2组注水井进行对比试验,与未酸化预处理井相比,投注前酸化预处理的注水井,井口启动压力低,注水压力上升速度慢,满足低渗水敏储集层长期注水的需求。在后续开发中应用22井次,有效抑制了注水压力上升速度,达到预期的目的。Clay swelling is the main reason causing reservoir permeability reduction and water?injection pressure rising during waterflooding development of water?sensitive reservoirs.Though anti?swelling agents can be added to inhibit clay swelling and to reduce damage to permeability,water?injection pressure rising and insufficient water injection will occur in low permeability reservoirs.To achieve longterm and effective water injection and taking Wellblock Ji7for example,the study on anti?swelling technology for acidizing pretreatment is carried out for water?sensitive reservoirs.Compared with inorganic and organic anti?swelling agents,using acidizing pretreatment technology can get the minimum permeability loss,long?lasting and stable anti?swelling effects.Two injector groups with similar reservoir conditions in Wellblock Ji7are selected to carry out a contrast test.The results show that compared with the non?acidized pretreatment wells,the injectors with acidizing pretreatment before water injection are featured with low wellhead start pressure and slowly rising of water injection pressure,which can meet the demand of long?term water injection in low?permeability and water?sensitive reservoirs.Field applications of the pretreatment technology in22wells show that the technology can effectively slow down the rising of water injection pressure and good effects have been gained.

关 键 词：准噶尔盆地 吉木萨尔地区 水敏油藏 注水油藏 黏土膨胀 酸化预处理 防膨技术 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]