多层油藏水驱物理模拟相似性研究

发布时间：2018-08-01 09:03

【摘要】：目前,国内外已开发的油田纵向非均质严重,注水开发过程中引发了诸多矛盾和问题,如层间干扰严重、储量动用程度低、综合采收率低等。在当今石油资源日益趋紧的形势下,开展多层油藏水驱动态物理模拟实验研究,对认识油藏渗流机理,分析层间差异对开采效果的影响,研究直井变密度射孔优化技术的可行性具有重要意义。本文以胜利油田东辛油区五点法注采井网原型为背景,基于水驱油相似准则处理,进行了多层不均匀地层注水驱替物理模拟实验:1.首先以渗流理论和相似理论为基础,利用检验分析法推导了水驱油的相似准则;然后利用量纲分析法检验了推导结果的正确性;最后以东辛油区为实例,根据地层原型参数和室内能够满足的条件,换算了物理模拟所需的模型参数和操作参数。2.根据模型参数建立了多层物理模拟实验装置,利用操作参数开展了直井开采物理模拟实验,实验结果表明:(1)对于纵向非均质性油藏,在开采过程中,注入水绝大部分进入高渗层,导致低渗层的水驱动用情况差,产液量低,整体储量动用程度不均。与多层合采相比,分层开采的综合产液量较大。(2)变密度射孔技术可降低纵向非均质性对合层开采的不利影响,有效提高合采层段的产液量。3.利用COMSOL Multi-physics分别建立了均匀射孔和变密度射孔直井开采的水驱数值模型。通过分析模型的压力分布情况,进一步证实了直井变密度射孔技术的可行性。数值模型和对应物理模型产液量的良好拟合,论证了相似性物理模拟方法的正确性。
[Abstract]:At present, the longitudinal heterogeneity of developed oilfields at home and abroad is serious, and many contradictions and problems have been caused in the process of water injection development, such as serious interlayer interference, low reserve utilization, low comprehensive recovery, and so on. Under the situation of increasingly tight petroleum resources, the physical simulation study of water drive performance in multi-layer reservoir is carried out, and the influence of layer difference on production effect is analyzed to understand reservoir percolation mechanism. It is of great significance to study the feasibility of variable density perforation optimization technology in straight wells. Based on the prototype of the five-point injection and production pattern in Dongxin oil area of Shengli Oilfield, and based on the similar criteria of water flooding, the physical simulation experiment of water flooding displacement in multi-layer heterogeneous formation is carried out in this paper. On the basis of seepage theory and similarity theory, the similarity criterion of water flooding is deduced by means of test analysis, and the correctness of the derived results is verified by dimensional analysis. According to the formation prototype parameters and the conditions that can be satisfied in the laboratory, the model parameters and operating parameters required for physical simulation are converted. According to the model parameters, the multi-layer physical simulation experiment device is established, and the physical simulation experiment of the vertical well production is carried out by using the operating parameters. The experimental results show that: (1) for the longitudinal heterogeneity reservoir, in the process of production, Most of the injected water enters the hypertonic layer, which leads to poor water driving, low liquid production and uneven utilization of the whole reserves. Compared with multilayer combined mining, the comprehensive liquid production of stratified mining is larger. (2) variable density perforation technology can reduce the adverse effect of longitudinal heterogeneity invading the mining, and effectively increase the liquid production of combined mining strata. The numerical models of water drive for uniform perforation and variable density perforation are established by COMSOL Multi-physics. By analyzing the pressure distribution of the model, the feasibility of variable density perforation in vertical wells is further confirmed. The good fitting between the numerical model and the corresponding physical model proves the correctness of the similarity physical simulation method.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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