N油田深部调驱体系性能评价

发布时间：2018-04-19 21:38

本文选题：深部调驱 + 弱凝胶　；参考：《东北石油大学》2015年硕士论文

【摘要】：本文以N油田为研究目标区块,N油田具有天然裂缝,注水开发效果极差,存在注水沿着裂缝方向窜流,水驱动用程度低、非均质性严重、层间矛盾突出等问题,该油田曾采取过调剖措施,但是存在有效期短的问题,效果并不明显。综合分析N油田当前存在的问题和储层、流体等物性参数和开采情况后认为,弱凝胶深部调驱技术是适用于N油田的稳油控水技术。作者在查阅文献的基础上,总结了弱凝胶调驱作用机理和对比传统聚合物驱的优势,并模拟N油田温度、矿化度、流体特征、储层特征等油田条件,通过大量的室内筛选实验和评价实验,确定了适合于N油田的深部调驱体系由1900万分子量聚丙烯酰胺和有机铬交联剂JL-3组成,对体系进行了稳定性评价实验,实验结果表明该弱凝胶体系在N油田条件下具有较好热稳定性能。模拟N油田非均质性进行了三岩心并联封堵实验,揭示了凝胶体系的选择性进入高渗透层的特性。采用三岩心并联模型和大型平板模型进行调驱实验,提高采收率值分别达到16.01%和18.29%,表明深部调驱技术能明显提高采收率;进行阻力系数和残余阻力系数测定实验,揭示了阻力系数随着渗透率的增大而减小、残余阻力系数随着岩心渗透率的增大而增大的规律。调驱剂注入速度对调驱效果的影响实验得到了低速注入调驱剂时比高速注入调驱剂时提高采收率效果好的结论,从而指导现场调驱剂时,要严格控制好注入速度。深部调驱动态特征研究实验结果表明深部调驱能使液流转向,调驱剂能随着后续注入流体在岩心中继续向前移动,体现出“堵而不死”的特性。推荐调驱剂配方为:1900万分子量聚丙烯酰胺,Cp=1500mg/L~2400mg/L,聚交比为1:1.7,段塞大小为0.3PV。研究成果为弱凝胶调驱技术在N油田矿场应用打下了坚实的理论基础。
[Abstract]:In this paper, with N oilfield as the target block, the oil field has natural fractures, the effect of water injection development is extremely poor, the water injection flows along the fracture direction, the degree of water driving is low, the heterogeneity is serious, and the contradiction between layers is prominent, and so on. The oilfield has adopted profile control measures, but there is a problem of short validity period, the effect is not obvious. Based on the comprehensive analysis of existing problems, reservoir, fluid and other physical parameters and production conditions in N oilfield, it is concluded that deep weak gel flooding technology is suitable for oil stabilization and water control in N oilfield. On the basis of literature review, the author summarizes the mechanism of weak gel modulation flooding and compares the advantages of conventional polymer flooding, and simulates the oil field conditions such as N oilfield temperature, salinity, fluid characteristics, reservoir characteristics, etc. Through a large number of laboratory screening experiments and evaluation experiments, it was determined that the deep modulation flooding system suitable for N oil field was composed of 19 million molecular weight polyacrylamide and organic chromium crosslinking agent JL-3, and the stability evaluation experiment was carried out on the system. The experimental results show that the weak gel system has good thermal stability in N oilfield. A parallel plugging experiment of three cores was carried out to simulate the heterogeneity of N oil field, which revealed the characteristics of selective entry of gel system into high permeability layer. By using three core parallel model and large plate model, the oil recovery is increased by 16.01% and 18.29, respectively. The results show that deep adjusting flooding technology can obviously improve oil recovery, and measure resistance coefficient and residual resistance coefficient. It is revealed that the resistance coefficient decreases with the increase of permeability, and the residual resistance coefficient increases with the increase of core permeability. The effect of injection rate of adjusting flooding agent on the effect of adjusting flooding has been tested. The conclusion that the oil recovery efficiency is better when low speed injection is injected is better than that in high speed injection, and the injection rate should be strictly controlled when guiding the field control of flooding agent. The experimental results show that deep control flooding can make the fluid flow turn and the flooding agent can continue to move forward along with the subsequent injection fluid in the core, which shows the characteristic of "plugging but not dying". The recommended formula is as follows: 19 million molecular weight polyacrylamide (CPN) 1500mg / L (2400mg / L), polymer ratio 1: 1.7and slug size 0.3PV. The research results lay a solid theoretical foundation for the application of weak gel flooding technology in N oil field.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

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