The J oilfield in the Bohai has a long development history and has undergone comprehensive adjustment measures,including water injection and polymer injection.Following these adjustments,the injection and production w...The J oilfield in the Bohai has a long development history and has undergone comprehensive adjustment measures,including water injection and polymer injection.Following these adjustments,the injection and production well network now features coexistence of both polymer injection wells and water injection wells,which has negatively impacted production dynamics.Firstly,based on the adjusted reservoir well network in the J oilfield,a representative water-polymer co-injection well network was established.Subsequently,a numerical simulation model of this typical reservoir unit was developed using reservoir numerical simulation methods to confirm the interference issues associated with water-polymer co-injection.Multiple reservoir numerical simulation models were designed to investigate various factors influencing water-polymer interference,resulting in graphical representations of each factor’s impact under different conditions.Finally,gray relational analysis was employed to rank the influence of these factors,yielding the following order of significance:polymer concentration,the ratio of drainage distance to well spacing,horizontal permeability variation,interlayer permeability variation,and intralayer permeability variation.This understanding provides robust guidance for future adjustments in the oilfield.展开更多
In low salinity polymer flooding(LSPF),an advanced hybrid method for enhanced oil recovery(EOR),less attention has been given to the impacts of potential determining ions on polymer behavior in carbonate reservoirs.Th...In low salinity polymer flooding(LSPF),an advanced hybrid method for enhanced oil recovery(EOR),less attention has been given to the impacts of potential determining ions on polymer behavior in carbonate reservoirs.Therefore,seawaters spiked with divalent ions were used with sulfonated polyacrylamide(SPAM)polymer to investigate the effects of potential determining ions on SPAM performance in wettability alteration,polymer adsorption,carbonate surface charge,viscosity enhancement,emulsion type,and oil recovery.Among divalent anions and cations,only excess amounts of Mg^(2+)in a smart water-polymer solution could alter the wettability from oil-wet to neutral-wet and make the rock/brine zeta potential positive.Additionally,higher SPAM adsorption onto carbonate surfaces was observed as Mg^(2+)concentration was doubled,driven by interactions between sulfonate groups(-SO_(3)^(-))and the positively charged rock surface.Conversely,excess SO_(4)^(2-)impeded interactions between -SO_(3)^(-) and positively charged carbonate rock species,reducing SPAM adsorption.At 5000 ppm SPAM concentration,excess divalent ions increased solution viscosity due to the shielding effect,with the highest viscosity achieved by doubling Mg^(2+)concentration.However,at 10,000 ppm SPAM concentration,only SO_(4)^(2-) improved viscosity,while Ca^(2+)and Mg^(2+)reduced the viscosity of smart water-polymer solutions.As for emulsions produced by smart water-polymer solutions,the presence of SPAM in smart water led to the production of water-in-oil(W/O)emulsions and increased the mean droplet size of water droplets due to the salt-out effect.According to the results obtained from calcite-coated micromodel flooding experi ments,the ultimate oil recovery for SW+SPAM(5000 ppm)was 34.2%.Also,a two-fold increase in the Mg^(2+)concentration rose the oil recovery by 6.5%.展开更多
随着危废焚烧量的激增,焚烧飞灰的安全处置成为环境保护领域的重大挑战。飞灰固化是焚烧飞灰安全处置的重要方法,但存在增容显著、可溶性盐固定效率不足的问题。针对这些问题,本研究以典型危废焚烧飞灰为对象,开发了一种结合特聚固化材...随着危废焚烧量的激增,焚烧飞灰的安全处置成为环境保护领域的重大挑战。飞灰固化是焚烧飞灰安全处置的重要方法,但存在增容显著、可溶性盐固定效率不足的问题。针对这些问题,本研究以典型危废焚烧飞灰为对象,开发了一种结合特聚固化材料、水性无机防水抗渗涂料及挤压成型工艺的综合处置方法。系统评估了该工艺对砖性能的影响。研究结果显示:砖减容比可达到2.47,抗压强度超过15.0 MPa,且浸出毒性符合GB18598-2001标准要求。XRD分析表明,养护过程中,特聚固化材料形成了水化产物来构建主要骨架结构;同时,水性无机防水抗渗涂层的应用显著抑制了氯离子(Cl^(-))的浸出,28 d Cl^(-)浸出率降至5.51%,盐分阻滞效率高达94.50%。该技术为高盐危废焚烧飞灰实现高效减容与安全稳定化处置提供了可行的解决方案。展开更多
基金supported by National Science and Technology Major Project of China(2016ZX05025-001)the Major Science and Technology Project of CNOOC(KJGG2021-0501).
文摘The J oilfield in the Bohai has a long development history and has undergone comprehensive adjustment measures,including water injection and polymer injection.Following these adjustments,the injection and production well network now features coexistence of both polymer injection wells and water injection wells,which has negatively impacted production dynamics.Firstly,based on the adjusted reservoir well network in the J oilfield,a representative water-polymer co-injection well network was established.Subsequently,a numerical simulation model of this typical reservoir unit was developed using reservoir numerical simulation methods to confirm the interference issues associated with water-polymer co-injection.Multiple reservoir numerical simulation models were designed to investigate various factors influencing water-polymer interference,resulting in graphical representations of each factor’s impact under different conditions.Finally,gray relational analysis was employed to rank the influence of these factors,yielding the following order of significance:polymer concentration,the ratio of drainage distance to well spacing,horizontal permeability variation,interlayer permeability variation,and intralayer permeability variation.This understanding provides robust guidance for future adjustments in the oilfield.
文摘In low salinity polymer flooding(LSPF),an advanced hybrid method for enhanced oil recovery(EOR),less attention has been given to the impacts of potential determining ions on polymer behavior in carbonate reservoirs.Therefore,seawaters spiked with divalent ions were used with sulfonated polyacrylamide(SPAM)polymer to investigate the effects of potential determining ions on SPAM performance in wettability alteration,polymer adsorption,carbonate surface charge,viscosity enhancement,emulsion type,and oil recovery.Among divalent anions and cations,only excess amounts of Mg^(2+)in a smart water-polymer solution could alter the wettability from oil-wet to neutral-wet and make the rock/brine zeta potential positive.Additionally,higher SPAM adsorption onto carbonate surfaces was observed as Mg^(2+)concentration was doubled,driven by interactions between sulfonate groups(-SO_(3)^(-))and the positively charged rock surface.Conversely,excess SO_(4)^(2-)impeded interactions between -SO_(3)^(-) and positively charged carbonate rock species,reducing SPAM adsorption.At 5000 ppm SPAM concentration,excess divalent ions increased solution viscosity due to the shielding effect,with the highest viscosity achieved by doubling Mg^(2+)concentration.However,at 10,000 ppm SPAM concentration,only SO_(4)^(2-) improved viscosity,while Ca^(2+)and Mg^(2+)reduced the viscosity of smart water-polymer solutions.As for emulsions produced by smart water-polymer solutions,the presence of SPAM in smart water led to the production of water-in-oil(W/O)emulsions and increased the mean droplet size of water droplets due to the salt-out effect.According to the results obtained from calcite-coated micromodel flooding experi ments,the ultimate oil recovery for SW+SPAM(5000 ppm)was 34.2%.Also,a two-fold increase in the Mg^(2+)concentration rose the oil recovery by 6.5%.
文摘随着危废焚烧量的激增,焚烧飞灰的安全处置成为环境保护领域的重大挑战。飞灰固化是焚烧飞灰安全处置的重要方法,但存在增容显著、可溶性盐固定效率不足的问题。针对这些问题,本研究以典型危废焚烧飞灰为对象,开发了一种结合特聚固化材料、水性无机防水抗渗涂料及挤压成型工艺的综合处置方法。系统评估了该工艺对砖性能的影响。研究结果显示:砖减容比可达到2.47,抗压强度超过15.0 MPa,且浸出毒性符合GB18598-2001标准要求。XRD分析表明,养护过程中,特聚固化材料形成了水化产物来构建主要骨架结构;同时,水性无机防水抗渗涂层的应用显著抑制了氯离子(Cl^(-))的浸出,28 d Cl^(-)浸出率降至5.51%,盐分阻滞效率高达94.50%。该技术为高盐危废焚烧飞灰实现高效减容与安全稳定化处置提供了可行的解决方案。
