辽河油田低渗透储层超前注水室内实验研究

发布时间：2018-04-30 09:06

本文选题：辽河油田 + 超前注水　；参考：《东北石油大学》2017年硕士论文

【摘要】：超前注水技术由于能够大幅度提升低渗透储层的水驱阶段采收率,因而现已成为对低渗透储层有效开发的一种重要的技术手段。其方法是在采油井进行开采之前,先从注水井向油藏中注水,以期在油井投入工作之前,其泄油面积内的含油饱和度能够高于储层当中原始的含油饱和度,并且使地层当中的压力大于原始的地层压力,可以在保证地层压力稳定的情况下,实现低渗透储层的稳产高产,大大减小了油田的开采时间。因而,对超前注水技术进行研究,有着十分重要的意义。本文基于辽河油田曙2-5-11区块杜家台油层进行了低渗透油田的超前注水室内研究。对于低渗透油藏超前注水相似准则研究得到26个相似准数,其中π10,π3,π8,π5为主要的相似准数,束缚水饱和度、可流动油饱和度,水相渗透率,井相对位置,井径和油层厚度成为影响室内低渗透油藏超前注水实验中影响采收率的关键技术参数。并在相似原理的基础上制作了物理模型,模型尺寸为30cm×30cm×4.5cm,直井采用反九点法井网进行大平板模型驱油实验。同时以长岩心进行超前注水实验中参数的确定,并用平板模型进行验证。实验结果表明,杜家台油层合理地层压力水平保持在120%,初期采油强度为0.356t/d·m;临界注入速度为2.4-4.19m/d;由于室内实验注采平衡,注采比为1:1,应按照现场注采比进行折算,确定现场注入水量与同步注水相比,在合理压力保持水平下,超前注水初期产液量高,见水早,但对含水上升速度有一定抑制作用;生产初期,注入井近井地带压力呈上升趋势,上升速度逐渐变缓,中后期压力呈下降趋势,且下降速度逐渐增加,采出井近井地带压力初期下降幅度大,随着开采时间的增加,压力趋于恒定。认为储层渗透率越低越适宜超前注水开发模式,需要的地层压力保持水平越高,开发效果越明显。通过超前注水室内实验研究能够对现场具有较强的指导意义,旨在更好地开发低渗透油田。
[Abstract]:Advanced water injection technology has become an important technical means for the effective development of low permeability reservoirs because it can greatly enhance the recovery factor of low permeability reservoirs in water drive stage. The method is to inject water from the water injection well into the reservoir before the oil well is produced, so that before the oil well is put into operation, the oil saturation in the oil discharge area can be higher than the original oil saturation in the reservoir. And the pressure in the formation is larger than the original formation pressure, which can guarantee the stability of formation pressure, realize the stable production and high yield of the low permeability reservoir, and greatly reduce the exploitation time of the oil field. Therefore, it is of great significance to study the advanced water injection technology. Based on Dujiatai reservoir in Shu2-5-11 block of Liaohe Oilfield, the laboratory study of advanced water injection in low permeability oil field has been carried out. For low permeability reservoirs, 26 similar parameters are obtained by studying the similarity criteria of water injection ahead of time. Among them, 蟺 10, 蟺 3, 蟺 8, 蟺 5 are the main similar criteria, the irreducible water saturation, the flowing oil saturation, the water phase permeability, the relative position of the well, Well diameter and reservoir thickness are the key technical parameters that affect oil recovery in the water injection experiment of indoor low permeability reservoir. The physical model is made on the basis of similarity principle. The size of the model is 30cm 脳 30cm 脳 4.5 cm. At the same time, the parameters of advanced injection experiment are determined by long core, and verified by plate model. The experimental results show that the reasonable formation pressure level of Dujiatai oil reservoir is kept at 120, the initial oil recovery intensity is 0.356t/d m, the critical injection rate is 2.4-4.19 m / d, and the injection-production ratio is 1: 1 due to the balance of injection and production in laboratory experiments, so it should be converted according to the field injection-production ratio. Compared with simultaneous water injection, at the reasonable pressure level, the initial liquid production is high and the water is early, but it has a certain inhibition on the water cut rising speed. The pressure in the near well zone of the injection well is on the rise trend, the rising speed is gradually decreasing, the pressure in the middle and late stage is decreasing, and the decreasing speed is gradually increasing. The pressure in the near well zone of the production well decreases greatly at the initial stage, and with the increase of the production time, The pressure tends to be constant. It is considered that the lower the reservoir permeability is, the more suitable the water injection development model is, and the higher the level of formation pressure is, the more obvious the development effect is. The laboratory experimental study of water injection in advance is of great significance to the field, and is aimed at developing low permeability oil fields better.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE53

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