海水介质分散型乳液调驱技术综合研究
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摘要
由于油水流度差异和油层的非均质性,使部分油井的水驱开发效果较差。近年来,为了改善水驱效果,对油水井采取了一些调驱作业。但对于海上油田,因为其独特的特点,例如缺乏淡水,作业平台面积狭小,环保要求高等,对海上施工作业有更高的要求,不能简单的照搬陆上油田的施工工艺。研究了海水介质分散型乳液与预聚酚醛树脂交联体系的配方,酚醛树脂交联体系稳定性好,封堵率大于95%。采用一维多点测压长岩心管进行了“边注边交联”的渗流实验,实验表明交联体系在岩心入口附近受到的剪切作用远远大于本身的交联作用,体现为剪切破坏。利用微观仿真模型进行了海水介质分散型乳液交联体系在多孔介质中的驱替实验,结果表明:交联体系在地层中形成弱冻胶之后,在大压差下具有一定的运移能力,呈现“驱”的作用;通过运移形成弱冻胶粘性颗粒,颗粒运移、再捕集,形成新的堵塞扩大注入水的波及效率,继续起到“调”的作用。海水介质分散型乳液交联体系在高盐油藏条件下的反应动力学研究,进一步完善了交联体系在地层中的粘度描述,全面考虑降解、吸附、渗透率下降系数等交联体系的物化机理,建立了考虑重力影响的海水介质分散型乳液交联体系在多孔介质中的三维三相九组分渗流数学模型;采用改进的IMPES方法对建立的渗流数学模型进行了求解,有效地克服了数值弥散和振荡,提高了计算的稳定性和可靠性。根据建立的渗流数学模型,以埕岛油田馆上段油藏为基础模型,定量分析了油藏参数、组分参数、注入参数对调驱效果的影响。采用人工神经网络方法建立的海水介质分散型乳液交联体系调驱选井决策模型综合考虑了注水井吸水能力、油层非均质性等因素对调驱决策的影响,CB1B-6井的实例分析表明本文提出的选井决策模型切实可行,可以最大限度地利用已有数据和资料,减少决策的主观影响,提高了计算的可靠性和科学化程度。应用数值模拟技术对CB1B-6的不同施工方案进行了效果预测,并根据经济评价指标优选出了CB1B-6调驱的最佳调驱剂量。提出了一套利用射流混合器和管道混合器进行海上油田海水介质分散型乳液交联体系调驱的平台连续施工工艺流程及混合器选择与参数设计方法,并开展了地面模拟实验。胜利埕岛油田CB1B-6井应用海水介质分散型乳液进行的现场试验获得了良好的效果。本论文的研究成果为发展海上水驱油田提高采油速度和采收率提供了一条新的技术思路。
Most oil field injected sea water into formation to supplement producing energy for production of offshore oilfield. Depending on the injected water,oil flow to well bore through porous media. Because the viscosity of water is more lower than that of oil, thus, the injected water fingering serious during displacement. Meanwhile the finger advance could result in "water breakthrough" and "water flush " because of heterogeneity of reservoir. As a rusult, waterflood efficiency of several oil well is bad. To disprosal and decrease the damage of the "water breakthrough" and "water flush", people launched operation of in-depth profile control. But because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform for operation, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. thus, waterflood efficiency of several oil well is bad. To improve waterflood efficiency, people launched operation of in-depth profile control. Because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. Thus, we can't copy the technology of land oilfield easily. We selected the dispensation of aqueous media type emulsion and prepolymerized resin. Stability of crosslinking system with resin is good. Coefficient of blankig off is more than 95%. We did displacing experimen with microscope simulation model established, in order to obverse the flow of crosslinking system with aqueous-media dispersing type emulsion through porous media. After the crosslinking system became weak gel, crosslinking system had the contribution of displace. Meanwhile, weak gel turned into viscoelastic behavior particle during moving. There particle moved and been captured to blank off flow channel, so that sweep efficiency of injected water became biger. Weak gel had the contribution of adjusting profile. Reaction kinetics of crosslinking system with aqueous-media dispersing type emulsion was studied. And the viscosity description was improved. The mathematical model for fluid flow through porous media of triaxial three-phase nine components was established on the considered of physicochemical mechanism such as degrade, absorbing, permeability plugging.The model was computed with the advanced method of IMPES which could overcame the dispersion and vibration of number. It advanced the stability and dependability of numrical calculation.On the basis of Chengdao Oilfield reservoir, the affects of reservoir parameters, components parameters, injected parameters to enhance oil recovery were analysied quantitatively by use of the model. The decision model about selecting well was established with artificial neural network. The model considered the affects of aborbing capacity of input well, formation heterageneity, production performance of communicate wells. And illustration descriped that CB1B-6 well is fit for in-depth profile control and flooding. This could utilize the existing data, decrease the affect of human factor, and improved the stability and scientific grade. The effectivenesses of different construct scheme to CB1B-6 were predicted with numerical model. At last, the best crosslinking system volume was optimized according to economin evaluation. Jet flow mixer was designed by the jet flow theory. The appropriate line mixer was selected. Construction technology of combination in-depth profile control and flooding was studied which is for the sake of construst on the platform in offshore oilfield. In-house experiments were developed. Aqueous-media dispersing type emulsion could be satisfied for offshore oilfield. The new technology extends a new thinking to improve oil recovery at the later stage of water flooding for offshore oilfield.
Most oil field injected sea water into formation to supplement producing energy for production of offshore oilfield. Depending on the injected water,oil flow to well bore through porous media. Because the viscosity of water is more lower than that of oil, thus, the injected water fingering serious during displacement. Meanwhile the finger advance could result in "water breakthrough" and "water flush " because of heterogeneity of reservoir. As a rusult, waterflood efficiency of several oil well is bad. To disprosal and decrease the damage of the "water breakthrough" and "water flush", people launched operation of in-depth profile control. But because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform for operation, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. thus, waterflood efficiency of several oil well is bad. To improve waterflood efficiency, people launched operation of in-depth profile control. Because of peculiar characteristic of offshore oilfield, such as the short of water, small area of platform, and high demand of environmental protection, the requirement is more higher while opreating in offshore oilfield. Thus, we can't copy the technology of land oilfield easily. We selected the dispensation of aqueous media type emulsion and prepolymerized resin. Stability of crosslinking system with resin is good. Coefficient of blankig off is more than 95%. We did displacing experimen with microscope simulation model established, in order to obverse the flow of crosslinking system with aqueous-media dispersing type emulsion through porous media. After the crosslinking system became weak gel, crosslinking system had the contribution of displace. Meanwhile, weak gel turned into viscoelastic behavior particle during moving. There particle moved and been captured to blank off flow channel, so that sweep efficiency of injected water became biger. Weak gel had the contribution of adjusting profile. Reaction kinetics of crosslinking system with aqueous-media dispersing type emulsion was studied. And the viscosity description was improved. The mathematical model for fluid flow through porous media of triaxial three-phase nine components was established on the considered of physicochemical mechanism such as degrade, absorbing, permeability plugging.The model was computed with the advanced method of IMPES which could overcame the dispersion and vibration of number. It advanced the stability and dependability of numrical calculation.On the basis of Chengdao Oilfield reservoir, the affects of reservoir parameters, components parameters, injected parameters to enhance oil recovery were analysied quantitatively by use of the model. The decision model about selecting well was established with artificial neural network. The model considered the affects of aborbing capacity of input well, formation heterageneity, production performance of communicate wells. And illustration descriped that CB1B-6 well is fit for in-depth profile control and flooding. This could utilize the existing data, decrease the affect of human factor, and improved the stability and scientific grade. The effectivenesses of different construct scheme to CB1B-6 were predicted with numerical model. At last, the best crosslinking system volume was optimized according to economin evaluation. Jet flow mixer was designed by the jet flow theory. The appropriate line mixer was selected. Construction technology of combination in-depth profile control and flooding was studied which is for the sake of construst on the platform in offshore oilfield. In-house experiments were developed. Aqueous-media dispersing type emulsion could be satisfied for offshore oilfield. The new technology extends a new thinking to improve oil recovery at the later stage of water flooding for offshore oilfield.
引文
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