摘要
针对稠油热采过程中因热流体窜流而导致的吸气剖面不均匀,进而影响蒸汽驱采收率的问题,拟用不同耐温特性的低成本体系配合耐高温冻胶的多段塞组合来提高封窜效率、降低作业成本。首先对比了不同温度下AM-NVP的水解速度,发现AM-NVP在高温下具有优异的热稳定性,其长期稳定性显著优于PAM和AM-AMPS共聚物,因此制备冻胶时选择AM-NVP为聚合物主剂。随后对聚合物、交联剂以及纳米二氧化硅的质量分数进行优选,形成耐温冻胶体系配方:w(AM-NVP)0.6%+w(水溶性酚醛树脂)0.2%+w(纳米二氧化硅)1.0%。该体系耐温性达到150℃,42 d脱水率小于5%,填砂管封堵率大于90%,可以满足稠油热采的封窜需要。
For the problem that thermal fluid channeling caused by uneven suction profile affects steam drive recovery factor in heavy oil thermal recovery process,low-cost system with different temperature resistance characteristics was combined with multi-slug of high temperature resistant gel to improve channeling efficiency and reduce operating costs.At first,the different temperature hydrolysis velocities of AM-NVP were compared,it was found that AM-NVP had excellent thermal stability at high temperatures,the long-term stability was significantly better than that of PAM and the AM/AMPS copolymer,so AM-NVP was chosen as main agent in the preparation of gel.Subsequently,the mass fractions of polymer,cross-linking agent and nanosilicon dioxide were optimized to form a temperature resistant gel system formula:w(AM-NVP)0.6%+w(water-soluble phenolic resin)0.2%+w(nanosilicon dioxide)1.0%.The temperature resistance of the system reached 150℃,the dehydration rate was less than 5%in 42 days,and the sealing rate of sand filling tube was more than 90%.It can meet the sealing channeling need of heavy oil thermal recovery.
作者
孙玉豹
王少华
吴春洲
肖洒
SUN Yu-bao;WANG Shao-hua;WU Chun-zhou;XIAO Sa(China Oilfield Services Limited Oilfield Production Division,Tianjin 300459,China)
出处
《当代化工》
CAS
2021年第4期803-807,共5页
Contemporary Chemical Industry
基金
国家重点研发计划,稠油化学复合冷采基础研究与工业示范(项目编号:2018YFA0702400)。
关键词
稠油
热采
耐温冻胶
多段塞
封窜
提高采收率
Heavy oil
Thermal recovery
Temperature-resistant gel
Multi-segment plugs
Sealing channeling
Enhanced oil recovery
