耐酸纳米微球的研发及CO_(2)驱封窜性能研究  

Preparation and CO_(2) flooding plugging channeling performance of acid resistant nanospheres

作　　者：马丽萍[1,2] 刘笑春[1,2] 杨棠英[1,2] 吕伟[1,2] 周博博 杨红斌 Liping Ma;Xiaochun Liu;Tangying Yang;Wei Lv;Bobo Zhou;Hongbin Yang(Oil and Gas Technology Research Institute,Changqing Oilfield Branch Company,PetroChina,Xi’an,Shaanxi 710018,China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an,Shaanxi 710018,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《日用化学工业》2022年第2期109-115,共7页China Surfactant Detergent & Cosmetics

基　　金：国家科技重大专项(2016ZX05056);中国石油天然气股份有限公司科技重大专项(2014E-3603);山东省自然科学基金(ZR2021ME171)。

摘　　要：针对长庆低渗透油藏CO_(2)驱出现的窜流难题,以丙烯酰胺(AM)、4-苯乙烯磺酸钠(SSS)和二甲基二烯丙基氯化铵(DMDAAC)为共聚单体,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,亚硫酸氢钠(SHS)和过硫酸铵(APS)为引发剂,通过反相微乳液聚合法研发了一种耐酸纳米微球(AR-NS)。采用红外光谱(FTIR)、扫描电镜(SEM)、热重(TG)及流变仪对产物的结构、形貌和性能进行了分析。结果表明,合成产物在乳液中为高分散度的纳米微球,其平均初始粒径为255 nm。在酸性地层水条件下,耐酸纳米微球的膨胀倍数为13.8倍而普通微球膨胀倍数仅为3.7倍;油藏温度85℃条件下、质量浓度为5 000 mg/L时耐酸纳米微球悬浮液黏度仅为0.56 mPa·s,具有优异的注入性;低渗裂缝岩心超临界CO_(2)驱封窜实验表明,耐酸纳米微球注入后裂缝性岩心的封堵率达95.41%,采收率提高了21.03%,耐酸纳米微球在低渗CO_(2)驱油藏中具有优异的封窜效果。Aimed at the channeling problem of CO_(2) flooding in low permeability reservoir of Changqing,acid resistant nanospheres (AR-ounts;NS) were prepared by inverseC microemulsion polymerization using acrylamide (AM) as monomer,4-styrene sulfonate (SSS) and dimethyl diallyl ammonium chloride (DMDAAC) as functional monomers,N,N’-methylene bis acrylamide (MBA) as crosslinking agent,sodium bisulfite and ammonium persulfate as initiators.The results show that the smooth microspheres with high dispersion are found in the emulsion,with an average particle size of 255 nm.The mass retention rate of the acid resistant nanospheres is still about 20%,when the temperature is 450℃.It has good temperature resistance.Under the condition of acid formation water,the expansion ratio of the acid resistant nanospheres is 13.8 times,while that of the ordinary nanospheres is only 3.7 times.When the reservoir temperature is 85℃and the concentration is 5 000 mg/L,the viscosity of the suspension is only 0.56 mPa·s,and it has good injectability.The plugging experiment of supercritical CO_(2) flooding in low permeability heterogeneous fractured core shows that the plugging efficiency of fractured core is 95.41%and the recovery efficiency is increased by21.03% after acid resistant nanospheres injection.Acid resistant nanospheres have excellent plugging channeling effect in low permeability CO_(2) flooding reservoirs.

关 键 词：CO_(2)驱油藏 耐酸性 纳米微球 封窜性能 

分 类 号：TE357[石油与天然气工程—油气田开发工程]