含油污泥调剖体系在裂缝性油藏的应用  

Application of Oily Sludge Profile System in Fractured Reservoir

作　　者：谢建勇[1] 石彦[1] 武建明[1] 韩慧玲[1] 崔容占 XIE Jianyong;SHI Yan;WU Jianming;HAN Huiling;CUI Rongzhan(Zhundong Oil Production Plant,Xinjiang Oilfield Company,PetroChina,Fukang,Xinjiang 831511,P R of 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：《油田化学》2021年第4期627-633,共7页Oilfield Chemistry

基　　金：新疆维吾尔自治区科技重大专项“油田含油污泥一体化治理与综合利用技术研究及产业化”(项目编号2018A02002)。

摘　　要：针对准东油田含油污泥固相含量高且不具备处理条件的情况,结合裂缝性油藏水井调剖需要高强度堵剂,通过添加稠化剂、交联剂、固化剂制备了3种不同强度的含油污泥调剖剂,评价了其悬浮性能、封堵性能和固化强度。结果表明,准东油田含油污泥中粒径小于425μm的固相颗粒可以被携带进入地层,污泥利用率达90%以上。30%含油污泥固相颗粒+0.3%稠化剂的污泥悬浮体系,悬浮时间大于60 min。30%含油污泥固相颗粒+0.3%稠化剂+0.2%交联剂的污泥冻胶体系,在40~90℃范围内成胶强度稳定,在火烧山油层温度55℃时,体系的成胶强度为26.8 Pa·s,矿化度50 g/L以内成胶强度基本不受影响,具有较好的稳定性和耐剪切性,对岩心的封堵率大于85%,突破压力大于6.8 MPa。30%含油污泥固相颗粒+0.3%稠化剂+0.2%交联剂+0.6%~0.7%固化剂的污泥固化体系,所形成的固结体的抗压强度为4.6 MPa。3种污泥体系的强度不同,组合使用可以实现对裂缝油藏的有效封堵。现场规模应用36井次,累计处理含油污泥31186 m^(3),节约污泥处理费用1500万元,井组累计增油7956 t,在改善油田开发效果的同时达到了含油污泥资源化利用的目的。In view of the high solid phase content of oil-containing sludge and the lack of treatment conditions in the Zhundong oilfield,combined with the need of cracked oil storage wells,three different strength oily sludge profile agents were prepared by adding thickening agents,cross-linking agents and curing agents,and its suspension performance,blocking performance and curing strength were evaluated.The results showed that solid-phase particles of oil-containing sludge in the Zhundong oilfield,which was smaller than 425μm,could be carried into the formation,and the utilization rate of sludge was more than 90%.The suspension time of a sludge suspension system,composed of 30%oily sludge+0.3%thickener was greater than 60 min.The sludge gelling system,composed of 30%oily sludge+0.3%thickener+0.2%crosslinker,had good temperature,salt resistance performance and shear resistance.The gel strength changed little at the temperature of 40—90℃and beyond the mineralization degree of 50 g/L,the gel strength was 26.8 Pa·s at the formation temperature of 55℃.Core flow experiments showed that the gelling system had over 85%plugging rate,and over 6.8 MPa breakthrough pressure.The pressure strength of the sludge curing system,composed of 30%oily sludge+0.3%thickener+0.2%crosslinker+0.6%—0.7%curing agent,was 4.6 MPa.The strength of the three sludge systems was different,and the combined use could achieve effective sealing of fractured reservoir.The oily sludge profile system was applied On-site scale for 36 wells,cumulative treatment amount of oily sludge was 31186 m^(3),saving sludge treatment costs of 15 million yuan,well group cumulative oil increase was 7956 tons.As a result,the oily sludge profile system not only improved the effect of oil field development,but also realized resource utilization of oily sludge.

关 键 词：裂缝 含油污泥 封堵 调剖 资源化利用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]