海上B油田低渗储层注入水配伍性及降压增注研究

发布时间：2018-04-07 15:32

本文选题：低渗储层　切入点：注水　出处：《西南石油大学》2015年硕士论文

【摘要】：注水开发是海上低渗透油藏最主要的开发方式。针对实际油藏注水开发中出现注水压力不断上升,注水量不断下降等实际问题,急切需要对配伍性注入水水质指标高低限设计以及有效降压增注技术进行研究,以解除注水井堵塞,延长注水开发有效周期。以海上B油田沙河街低渗储层为例,首先,本文分析了B油田的物性特征以及目前的水质控制现状,着重对注水过程中造成储层伤害的因素,如悬浮颗粒含量、悬浮颗粒粒径、乳化油含量、敏感性矿物等,展开了全面、系统的配伍性实验研究,基于室内实验结果提出适合沙河街储层的配伍性水质方案。其次,利用设计的配伍性水质指标预测B油田低渗区块不同注水井吸水能力的变化趋势,发现各井注水时间半衰期得到延长。为进一步延长注水增注周期,研究了新型有效的增注技术,此技术结合目前低渗储层常用的表面活性剂增注技术以及活性纳米材料增注技术作用机理,将双子表面活性剂MT-01与NPS-L纳米乳液两种增注剂进行复配,制备出不仅能够达到超低界面张力,稳定性良好,还有一定黏土防膨能力和优秀润湿性能的复合体系,用于注水井降压增注。最后,在室内岩心驱替实验中,复合体系比NPS-L纳米乳液单独作用或双子表面活性剂单独作用,表现出更好的降压增注效果。本文最终获取了适合该储层的配伍性注入水水质指标以及有效的降压增注技术。为指导海上B油田低渗储层以及物性相近低渗区块的开采提供了基础的实验依据,具有现实意义。
[Abstract]:Water injection development is the most important way to develop low permeability reservoirs on the sea.In view of the practical problems such as rising injection pressure and decreasing water injection rate in actual reservoir water injection development, it is urgent to study the high and low limit design of compatible injection water quality index and the effective technology of reducing pressure and increasing injection.In order to remove the plugging of water injection wells and prolong the effective cycle of water injection development.Taking Shahejie low permeability reservoir in offshore B oil field as an example, firstly, this paper analyzes the physical characteristics of B oil field and the present water quality control situation, focusing on the factors that cause reservoir damage in the process of water injection, such as suspended particle content, suspended particle size, etc.A comprehensive and systematic experimental study on compatibility of emulsified oil and sensitive minerals was carried out. Based on the results of laboratory experiments, a compatible water quality scheme suitable for Shahejie reservoir was proposed.Secondly, by using the designed compatible water quality index to predict the change trend of water absorption capacity of different injection wells in low permeability block of B oilfield, it is found that the half-life of injection time of each well is prolonged.In order to further prolong the injection increasing period of water injection, a new and effective injection increasing technology is studied, which combines the surfactant injection technology and the mechanism of the active nanometer material injection technology, which are commonly used in low permeability reservoirs at present.The Gemini surfactant MT-01 and NPS-L nano-emulsion were mixed to prepare the composite system, which could not only achieve ultra-low interfacial tension, good stability, but also had certain anti-swelling ability and excellent wetting property of clay.Used for reducing pressure and increasing injection in water injection wells.Finally, in the laboratory core displacement experiment, the composite system has better effect of reducing pressure and increasing injection than NPS-L nano-emulsion alone or Gemini surfactant alone.In this paper, the compatible injection water quality index and the effective technique of reducing pressure and increasing injection are obtained.It provides a basic experimental basis for the exploitation of low permeability reservoirs and low permeability blocks with similar physical properties in offshore B oilfield, and has practical significance.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.61

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