柔性微球封堵剂的封堵性能及机理研究  

Research on plugging performance and mechanism of flexible microsphere plugging agent

作　　者：徐哲[1] 孙金声[1,2] 刘敬平 吕开河[1] 侯德林[1] 王建 梁浩[3] 胡静 XU Zhe;SUN Jinsheng;LIU Jingping;LYU Kaihe;HOU Delin;WANG Jian;LIANG Hao;HU Jing(State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;Drilling Fluid Technology Service Company,Chuanqing Drilling Engineering Company Limited,CNPC,Chengdu 610056,China)

机构地区：[1]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580 [2]中国石油集团工程技术研究院有限公司,北京102206 [3]中国石油集团川庆钻探工程有限公司钻井液技术服务公司,四川成都610056

出　　处：《断块油气田》2024年第6期1105-1113,1121,共10页Fault-Block Oil & Gas Field

基　　金：深层油气全国重点实验室自主研究课题“超高温高盐高密度条件下聚合物水基钻井液滤失性能调控研究”(SKLDOG2024-ZYRC-03);国家自然科学基金资助项目“超深特深层油气钻采流动调控”(52288101)。

摘　　要：随着油气勘探开发不断向深层超深层深入,对钻井液封堵剂的抗高温高盐性能提出了更高的要求。文中以2-丙烯酰胺-2-甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAA)、苯乙烯(St)为主要原料,制备了一种柔性微球封堵剂PSDA,其粒径约为170 nm。采用纤维型微孔滤膜、岩心、孔洞型微孔滤膜对PSDA分散液的抗温、抗盐及封堵性能进行了综合评价。实验结果表明,PSDA分散液在20%NaCl条件下,可抗220℃,1%PSDA分散液对渗透率为9.58×10^(-4)μm^(2)岩心的封堵率达80.1%。在相同条件下,其性能优于纳米聚酯(NP-1)和纳米微球(NF-1)。同时,通过扫描电子显微镜(SEM)对PSDA的封堵机理进行研究,表明PSDA的封堵机理包括表面吸附、单微球直接封堵、变形封堵、架桥封堵以及充填形成封堵层。PSDA可用于封堵超高温高盐地层的纳微米孔隙裂缝,对其机理的研究进一步丰富了现有的柔性封堵机理。As oil and gas exploration and development continue to go deeper into the deep and ultra-deep layer,higher requirements are put forward for the anti-temperature and high-salt properties of drilling fluid plugging agents.In this paper,a flexible microsphere plugging agent(PSDA)with a particle size of about 170 nm was prepared by using 2-acrylamido-2-methylpropanesulfonic acid(AMPS),N,N-dimethylacrylamide(DMAA),and styrene(St)as the main raw materials.Fibre-based microporous filter membranes,cores,and pore-based microfiltration membranes were used to comprehensively evaluate the temperature resistance,salt resistance,and plugging properties of the PSDA dispersion liquid.The experimental results showed that the PSDA dispersion liquid could resist 220℃under 20%NaCl,and the plugging rate reached 80.1%of 1%PSDA dispersion liquid on the core with permeability of 9.58×10^(-4)μm^(2).Under the same conditions,its properties were superior to that of nanopolyester(NP-1)and nano-microspheres(NF-1).Meanwhile,the plugging mechanism of PSDA was studied by scanning electron microscopy(SEM).The results showed that the plugging mechanisms of PSDA included surface adsorption,direct plugging by single microspheres,deformation plugging,bridging plugging,and filling to form a plugging layer.PSDA can be used to plug nano-micron pore fractures in ultra-high-temperature and high-salt formations,and the study of its mechanism further enriches the existing flexible plugging mechanism.

关 键 词：柔性微球 滤失 高温高盐 封堵机理 

分 类 号：TE254.4[石油与天然气工程—油气井工程]