JZ9-3油田注入井堵塞物组分分析及形成机理研究  

Composition analysis and formation mechanism of plug in injection well of JZ9-3 Oilfield

作　　者：鲍彦锋 郑凯亓 高建崇 唐晓旭 薛宝庆 BAO Yan-feng;ZHENG Kai-qi;GAO Jian-chong;TANG Xiao-xu;XUE Bao-qing(Bohai Oil Research Institute of Tianjin Branch,CNOOC,Tianjin 300450,China;Key Laboratory of Enhanced Oil and Gas Recovery(Ministry of Education),Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300450 [2]提高油气采收率教育部重点实验室(东北石油大学),黑龙江大庆163318

出　　处：《化学工程师》2022年第8期63-67,共5页Chemical Engineer

基　　金：海洋石油高效开发国家重点实验室第五批开放基金“河流相复合砂体构型对剩余油分布影响机制研究”(CCL2021R CPS0510KQN)。

摘　　要：为解决渤海油田JZ9-3油田注入井堵塞问题,利用布氏黏度计、X射线衍射仪、超声波分散仪等对JZ9-3油田注入井堵塞物进行组分分析,并针对实验结果进行相应的形成机理研究。结果表明,堵塞物中主要成分为87.77%的水,3.83%的原油,2.76%的聚合物和5.64%的无机垢。无机垢中主要包括SiO_(2)、CaCO_(3)和MgCO_(3)。结合JZ9-3油田注入井注入聚合物和注入水的水质情况,有机堵塞物主要是高浓度聚合物溶液,分析其来源主要是由于海上平台空间较小,熟化时间较短,导致未熟化的聚合物在筛管和岩心端面堆积所致;无机垢中的SiO_(2)主要来源是由于注入压力波动时地层出砂所致;当温度压力变化时会导致注入水中的成垢离子的溶度积发生变化,从而产生CaCO_(3)和MgCO_(3)等沉淀。另外注水过程中,存在一定的金属腐蚀,从而形成少量的Fe_(2)O_(3)垢。In order to solve the problem of plug removal in injection wells of JZ9-3 Oilfield in Bohai Oilfield,the composition of plug in injection wells of JZ9-3 oilfield is analyzed by using Brinell viscometer,X-ray diffractometer and ultrasonic disperser,and the corresponding formation mechanism is studied according to the experimental results.The results showed that the main components of the plug are 87.77%water,3.83%crude oil,2.76%polymer and 5.64%inorganic scale.Inorganic scale mainly includes SiO_(2),CaCO_(3) and MgCO_(3).Combined with the injection of polymer and injection water quality in the injection well of JZ9-3 Oilfield,the organic blockage is mainly high concentration polymer solution.It is analyzed that it is mainly caused by the accumulation of immature polymer on the screen tube and core end face due to the small space of offshore platform and short maturation time;SiO_(2) in inorganic scale is mainly caused by formation sand production when injection pressure fluctuates;When the temperature and pressure change,the solubility product of scaling ions in the injected water will change,so as to produce precipitates such as CaCO_(3) and MgCO_(3).In addition,there is certain metal corrosion during water injection,resulting in a small amount of Fe_(2)O_(3) scale.

关 键 词：有机堵塞物 无机垢 形成机理 XRD 超声波分散仪 

分 类 号：TE39[石油与天然气工程—油气田开发工程]