刘俊凯,徐鑫,呼苏娟,薛伟,肖波,李军建,于宏超,陈江
LIU Junkai,XU Xin,HU Sujuan,XUE Wei,XIAO Bo,LI Junjian,YU Hongchao,CHEN Jiang

• 1:中国石油长庆油田公司第五采油厂
• 2:中国石油长庆油田公司油气工艺研究院
• 3:中国石油长庆油田公司勘探开发研究院

摘要(Abstract)：

为明确均匀沥青质沉积下的储层伤害特征及机理，通过岩心真空饱和原油的实验，建立均匀沥青质岩心沉积方法，开展正向水驱及反向水驱实验分析均匀沥青质下储层油水渗流规律。结果表明：与直接饱和法相比，真空饱和法的岩心中沥青质沉积量大且分布均匀，对岩心绝对渗透率伤害小于对两相相对渗透率伤害，残余油饱和度增大了28.6%，油水两相共渗区收窄且向左偏移，油相相对渗透率降低了15.5%，水相相对渗透率提高了33.2%，但最大水相相对渗透率则下降了19.5%；储层伤害方式包括孔喉堵塞和表面沉积引起的润湿性和孔喉半径变化，孔喉堵塞对绝对渗透率的影响大于相对渗透率，而表面沉积对相对渗透率的影响大于绝对渗透率；非均匀沥青质沉积的储层伤害方式以孔喉堵塞伤害为主，占总伤害的比例为65.2%，均匀沥青质沉积的伤害方式则以表面沉积伤害为主，占总伤害的比例为73.1%。研究成果可为全面深入认识沥青质沉积伤害及防治沥青质沉积提供依据。
In order to clarify reservoir damage characteristics and mechanism with uniform asphaltene deposition, the uniform asphaltene cores are established through experiment of core vacuum saturated crude oil, and forward water drive and reverse water drive experiments are carried out to analyze oil and water flowing law of reservoir with uniform asphaltene. The results show that, compared with direct saturation method, the asphaltene deposition in the cores of vacuum saturation method has large amount and distributes uniformly, and the impact on absolute permeability damage of the core is less than that on two-phase relative permeability damage. Residual oil saturation increases by 28.6%, oil-water two-phase co-permeability area narrows and shifts to the left, oil relative permeability decreases by 15.5%, and water relative permeability increases by 33.2%, but maximum water relative permeability decreases by 19.5%. Reservoir damage patterns include changes of wettability and pore throat radius caused by pore throat blockage and surface deposition. The effect of pore throat blockage on absolute permeability is more than that of relative permeability, while the effect of surface deposition on relative permeability is more than that of absolute permeability. Reservoir damage pattern of non-uniform asphaltene deposition is mainly pore throat blockage, accounting for 65.2% of the total damage, while the damage pattern of uniform asphaltene deposition is mainly surface deposition, accounting for 73.1% of the total damage. The results provide basis for comprehensively and deeply understanding the damage of asphaltene deposition and preventing asphaltene deposition.

关键词(KeyWords)： 沥青质;非均匀性;渗透率;储层伤害;孔喉堵塞;表面沉积
asphaltene;non-uniformity;permeability;reservoir damage;pore throat blockage;surface deposition

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（2016ZX05050）

作者(Author): 刘俊凯,徐鑫,呼苏娟,薛伟,肖波,李军建,于宏超,陈江
LIU Junkai,XU Xin,HU Sujuan,XUE Wei,XIAO Bo,LI Junjian,YU Hongchao,CHEN Jiang

DOI: 10.19597/j.issn.1000-3754.202202032

参考文献(References)：

• [1]HAMMAMI A,PHELPS C H,MONGER-MCCLURE T,et al.Asphaltene precipitation from live oils:An experimental investigation of onset conditions and reversibility[J].Energy&Fuels,2000,14(1):14-18.
• [2]FAKHER S, IMQAM A, WANAS E.Investigating the viscosity reduction of ultra-heavy crude oil using hydrocarbon soluble low molecular weight compounds to improve oil production and transportation[R].SPE 193677,2018.
• [3]雷浩.低渗储层CO2驱油过程中沉淀规律及防治对策研究[D].北京：中国石油大学（北京），2017.LEI Hao.Deposition mechanisms and reservoir protection countermeasures of a low-permeability formation in CO2 flooding process[D].Beijing:China University of Petroleum(Beijing),2017.
• [4]GOLKARI A,RIAZI M. Experimental investigation of miscibility conditions of dead and live asphaltenic crude oil CO2 systems[J]. Journal of Petroleum Exploration and Production Technology,2017,7(2):597-609.
• [5]唐梅荣，张同伍，白晓虎，等.孔喉结构对CO2驱储层伤害程度的影响[J].岩性油气藏，2019,31(3):1-8.TANG Meirong,ZHANG Tongwu,BAI Xiaohu,et al. Influence of pore throat structure on reservoir damage with CO2 flooding[J].Lithologic Reservoirs,2019,31(3):1-8.
• [6]MENDOZA J,ANGLE L,ARGUELLES F J,et al. Asphalteneinduced precipitation and deposition during pressure depletion on a porous medium:An experimental investigation and modeling approach[J].Energy&Fuels,2009,23(11):5611-5625.
• [7]LEI H,YANG S L,ZU L H,et al.Oil recovery performance and CO2 storage potential of CO2 water-alternating-gas injection after continuous CO2 injection in a multilayer formation[J].Energy&Fuels,2016,30(11):8922-8931.
• [8]苗万春，何善斌，张兴，等.致密砂岩油藏CO2驱替沥青质沉积及储层伤害特征[J].成都理工大学学报（自然科学版），2021,48(5):573-581.MIAO Wanchun,HE Shanbin,ZHANG Xing,et al.Characteristics of asphaltene deposition and reservoir damage caused by CO2flooding in tight sandstone reservoir[J].Journal of Chengdu University of Technology(Science&Technology Edition), 2021,48(5):573-581.
• [9]STRUCHKOV I A, ROGACHEV M K, KALININ E S, et al.Laboratory investigation of asphaltene-induced formation damage[J]. Journal of Petroleum Exploration and Production Technology,2019,9(2):1443-1455.
• [10]ESKIN D,OMID M,KAMRAN A,et al.Reservoir impairment by asphaltenes:A critical review[J].The Canadian Journal of Chemical Engineering,2016,94(6):1202-1217.
• [11]UETANI T. Wettability alteration by asphaltene deposition:A field example[R].SPE 171788,2014.
• [12]QIAN K,YANG S L,DOU H E,et al.Experimental investigation on microscopic residual oil distribution during CO2 huff-andpuff process in tight oil reservoirs[J].Fuel,2018,11:28-43.
• [13]WEI B,ZHANG X,LIU J,et al.Supercritical CO2-EOR in an asphaltenic tight sandstone formation and the changes of rock petrophysical properties induced by asphaltene precipitation[J].Journal of Petroleum Science and Engineering,2020,184(2):376-385.
• [14]PAPADIMITRIOU N I,ROMANOS G E,CHARALAMBOPOU G C, et al. Experimental investigation of asphaltene deposition mechanism during oil flow in core samples[J].Journal of Petroleum Science and Engineering,2007,57(3-4):281-293.
• [15]王琛，李天太，赵金省，等.利用核磁共振技术研究沥青质沉积对低渗储层孔隙结构的影响[J].地球物理学进展，2018,33(4):1700-1706.WANG Chen,LI Tiantai,ZHAO Jinsheng,et al.Study on effect of asphaltene precipitation on the pore structure of low permeability reservoir by Nuclear Magnetic Resonance(NMR)[J]. Progress in Geophysics,2018,33(4):1700-1706.
• [16]陈龙龙，余华贵，汤瑞佳，等.沥青质沉积对轻质油藏CO2驱的影响[J].油田化学，2017,34(1):87-93.CHEN Longlong,YU Huagui,TANG Ruijia,et al.Effect of asphalt deposition on CO2 flooding in light oil reservoir[J]. Oilfield Chemistry,2017,34(1):87-93.
• [17]油气田开发专业标准化委员会.油藏岩石润湿性测定方法：SY/T 5153—2017[S].北京：石油工业出版社，2017.Standardization Committee of Oil and Gas Field Development.Test method of reservoir rock wettability:SY/T 5153—2017[S].Beijing:Petroleum Industry Press,2017.
• [18]全国石油产品和润滑剂标准化委员会石油沥青分技术委员会.石油沥青四组分测定法：NB/SH/T 0509—2010[S].北京：中国石化出版社，2010.Petroleum Bitumen Sub-technical Committee, National committee on petroleum products and lubricants of standardization administration.Test method for separation of asphalt into four fractions:NB/SH/T 0509—2010[S]. Beijing:Sinopec Press,2010.
• [19]MOHAMED M,JOCIN A,MASHHAD F.The impact of asphaltene deposition on fluid flow in sandstone[J].Journal of Petroleum Science and Engineering,2019,174:674-681.
• [20]ZEKRI A Y,SHEDID A S.The effect of fracture characteristics on reduction of permeability by asphaltene precipitation in carbonate formation[R].SPE 80542,2003.