Abstract
Abstract Polymer flooding technology has shown satisfactorily acceptable performance in improving oil recovery from unconsolidated sandstone reservoirs. The adsorption of the polymer in the pore leads to the increase of injection pressure and the decrease of suction index, which affects the effect of polymer flooding. In this article, the water and oil content of polymer blockages, which are taken from Bohai Oilfield, are measured by weighing method. In addition, the synchronous thermal analyzer and Fourier transform infrared spectroscopy (FTIR) are used to evaluate the composition and functional groups of the blockage, respectively. Then the core flooding experiments are also utilized to assess the effect of polymer plugs on reservoir properties and optimize the best degradant formulation. The results of this investigation show that the polymer adsorption in core after polymer flooding is 0.0068 g, which results in a permeability damage rate of 74.8%. The degradation ability of the agent consisting of 1% oxidizer SA-HB and 10% HCl is the best, the viscosity of the system decreases from 501.7 to 468.5 mPa‧s.
Highlights
We analyzed the composition of Wenting Dong, Keliang Wang and Yue Qiu, Key Laboratory of two blockages from loose sandstone polymers in the EEWdnehunactanintcigeodnD,OoDnilagRq,eiCncNgoO,veHOreCyil(EoNnnoegrrjtgihayenDagse,tv1Pe6el3ot3pro1m8lee,unCmthEiUnnE*angC-imivonerearresielri:tisnykp)gn,oTMonemicdnhuiisnnrtoargly@oAogpufyothp1oBo1r.fo:ohKdtanahi.zenuOem.bijlplafoisecalkdNa.goTemshueraacr:eoTmoekpvyoaosluiMtaieotdenidcaanlbadyndftuhDneecntitsoaylnnUacnlhirgvoernorsuoitupyss, Ichikawa, 272-08
Dong et al.: Investigation on degradation mechanism of polymer blockages 57 be calculated by the change of mass
The research aimed to identify the composition of polymer blockages in unconsolidated sandstone reservoirs
Summary
Polymer flooding has shown enhancing oil recovery due to degradDbaretaio,nnaictmitoienncgh1ao.4nn]is)a;mn(;veiv)aadtlnheugdeartLahideoigoanhtnimoapnrordedsumpsluaeeirtreh(scoweodeanst[se5i(r,s3Ptj,ie7rnt)osg.p, ooAcfsalitanthioopbunaegi9ruh.so2e]ft)dho. Ministry of Education, Daqing, Heilongjiang, 163318, China, of plugging degradation [8,9]. We analyzed the composition of Wenting Dong, Keliang Wang and Yue Qiu, Key Laboratory of two blockages from loose sandstone polymers in the Branch, CNOOC Experimental Center, Bohai ExPpaeruiml Teenrtawl Cilelnigteerr,: Departthmeermntaolf Maantahleymzearticsa,nUdnivFeTrsIiRty, ofreWsipsecocntisvienl,yM. Dong et al.: Investigation on degradation mechanism of polymer blockages.
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