低渗透砂岩油藏水驱开发效果评价指标与方法研究

【作者】 罗银富；

【导师】 黄炳光；

【作者基本信息】 西南石油学院 ， 油气田开发工程， 2005， 硕士

【摘要】 我国低渗透油藏的探明地质储量约占全部探明地质储量的1/4。如何开发好低渗透油藏,其意义甚为重大。我国低渗透油藏的天然弹性能量普遍较小,所以基本上都先后采取了注水保持压力的开发方式。但各低渗透油藏地质情况十分复杂,如何注水才能达到最佳开发效果始终是人们关注的问题。因此,对注水开发低渗透油田的水驱开发效果进行科学的评价,对于进一步搞好油藏注水开发,为实施调整挖潜措施提供可靠依据以及提高油藏最终采收率都具有十分重要的意义。本文在借鉴以往对中高渗透油藏注水开发效果评价的一些方法和原理的基础上,考虑到低渗透砂岩油藏普遍具有启动压力梯度这一特点,结合油藏工程、系统工程、模糊数学、层次分析原理等方法,首先给出了四种确定低渗透砂岩油藏启动压力梯度的方法,针对宝浪油田宝北区块确定出其平均启动压力梯度,然后讨论了启动压力梯度对低渗透砂岩油藏水驱开发效果的影响,最后创新性的针对低渗透砂岩油藏的水驱开发效果从三个方面即水驱开发潜力、水驱开发效果和水驱开发人为控制因素等进行了科学的评价。各个方面都建立了相应的评价指标和评价标准及计算方法。其中为了对低渗透砂岩油藏含水上升规律进行评价,创新性的引入了含水上升率评价指标、评价标准及计算方法。经过本文对低渗透砂岩油藏宝浪油田宝北区块水驱开发效果评价的实例分析,得到了和生产实际相符合的评价结果,证明本文提出的评价指标、评价标准与计算方法切实可行。更多还原

【Abstract】 In China, 1/4 proven reserves of all the proven reserves is in low permeability reservoir. How to develop low permeability reservoir efficiently is of great significance. The original elastic energy in low permeability reservoir is generally small, so all the oil fields early or late adopt water flooding to keep the pressure of the low permeability reservoir. But the geology in all the low permeability reservoirs is very complex. How to water flood to get the best development effect is always what people concerns about. Therefore, evaluating the water flooding effect of low permeability reservoir scientifically is of great importance to deepen the water flooding and offer reliable reference of carrying out the measures of exploring the potential reserves as well as increase the oil recovery. Drawing lessons from the evaluation methods and principles of water flooding in exploring the middle-high permeability reservoirs, taking the fact that all the tow permeability reservoirs are of threshold pressure gradient(TPG) into account, with the methods of oil reservoir engineering, system engineering, fuzzy mathematics and principle of hierarchy analysis, we firstly produce 4 methods to determine the TPG of low permeability reservoir. With those 4 methods, we determined the TPG of Baobei block, Baolang oilfield. Then, we discussed the impact of TPG on the water flooding effect in low permeability reservoir. Finally, we evaluated the water flooding effect of low permeability sandstone reservoir innovatively and scientifically in three ways: potential of water flooding, effect of water flooding and man-controlled factors of water flooding. In each way, we created corresponding evaluation indices, evaluation criteria and calculating methods. And we produced evaluation index of increased rate of water cut innovatively in order to evaluate the containing water rising regular in low permeability sandstone reservoir. By analyzing the water flooding effect of Baobei block, Baolang oilfield, we got results that match produce, which proves that the evaluation indices, evaluation criteria and the calculating methods produced by this paper are reliable and applicable.更多还原