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纳米聚合物微球对高渗透介质封堵效果评价及作用机理
刘娅菲,杨静雯,姚婷玮,周德胜,陈硕思
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(1.西安石油大学石油工程学院,陕西西安710065;2.陕西省油气田特种增产技术重点实验室,陕西西安710065;3.中国石油长庆油田分公司第二采油厂,甘肃庆阳745100;4.中国石化胜利油田分公司勘探开发研究院,山东东营257015)
摘要:
纳米聚合物微球尺寸小、性质稳定、形变能力好,可以运移至油藏深部进行调驱从而有效扩大波及面积,提高注水开发效率。为明晰纳米聚合物微球在高渗透层的封堵性能,利用支撑剂裂缝评价系统模拟高渗透通道,在不同实验条件下注入具有不同质量浓度和粒径的纳米聚合物微球,通过注入微球前后渗透率变化评价和分析其对高渗透层的封堵效果。实验结果表明:纳米聚合物微球能够封堵高渗透层;增加驱替流量不利于微球封堵,闭合压力与封堵效果呈波动变化关系,纳米聚合物微球溶液质量浓度和粒径与封堵效果未呈现明显的线性关系而是存在最优值。对实验参数进行主控因素分析后得到驱替流量对纳米聚合物微球封堵效果影响最大,闭合压力次之;而纳米聚合物微球溶液质量浓度和粒径影响相对较小。
关键词:  纳米聚合物微球  高渗透介质  导流能力  封堵机理  主控因素  驱油效果
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.016
基金项目:国家科技重大专项“低渗透致密砂岩气藏压裂裂缝及参数优化”(2016ZX05050-009),国家自然科学基金青年基金项目“微纳尺度油水界面离子调控机制及其微观渗流规律研究”(51904244)。
Investigation and analysis on the plugging performance of nanoscale polymer microspheres on high-permeability porous media
LIU Yafei,YANG Jingwen,YAO Tingwei,ZHOU Desheng,CHEN Shuosi
(1.College of Petroleum Engineering,Xi’an Shiyou University,Xi’an City,Shaanxi Province,710065,China;2.Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs,Xi’an City,Shaanxi Province,710065,China;3.No.2 Oil Production Plant of Changqing Oilfield Company,PetroChina,Qingyang City,Gansu Province,745100,China;4.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)
Abstract:
Owing to small size,stable property,and good deformation capacity,nanoscale polymer microspheres can migrate into deep formation to enlarge the swept area,thus enhancing waterflooding efficiency. To comprehend the plugging performance of nanoscale polymer microspheres on high-permeability layers,we used the propped fracture evaluation system to simulate the high-permeability channels and injected the solutions of nanoscale polymer microspheres with varying concentrations and particle sizes in different conditions. We analyzed and evaluated the plugging performance of these microspheres on the high-permeability layers according to the change in permeability before and after the injection. As a result,nanoscale polymer microspheres could plug the high-permeability layers. A higher injection rate led to lower plugging performance. As the closing pressure increased,the plugging performance fluctuated. No distinct linear relation was observed between the plugging performance and concentration or particle size of nanoscale polymer microspheres. Instead,concentration and particle size brought about corresponding optimal values of plugging performance. Analysis of dominant factors showed that the injection rate had the greatest influence,followed by closing pressure,and then concentration and particle size of nanoscale polymer microspheres.
Key words:  nanoscale polymer microspheres  high-permeability porous media  flow conductivity  plugging mechanism  dominant factors  oil displacement effect

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