基于网络模型的油藏优势通道形成微观机制

发布时间：2018-06-02 21:19

本文选题：疏松砂岩油藏 + 注水开发　；参考：《大庆石油地质与开发》2017年03期

【摘要】：基于实际疏松砂岩油藏优势通道发育特征,建立了考虑微粒运移及附加压力损耗的动态孔隙网络模型,对控制优势通道形成的微观因素进行了研究,明确了不同孔喉结构及工作制度下优势通道形成规律。研究结果表明:在常规网络模型基础上,针对孔喉中微粒脱落、运移、堵塞等行为建立数学模型,并考虑由优势通道引起的附加压力损耗,最终建立可模拟优势通道微观发育的网络模型;通过对比所建网络模型与实际优势通道发育特征,验证了网络模型的正确性,初步明确了孔喉半径动态变化与优势通道规模的关系;具有孔喉半径较大、配位数较多、形状因子较大等初始孔喉特征的储层,更易形成优势通道,驱替压差对其也有较大影响,总之,微粒在孔喉中堵塞与疏通所形成的平衡关系对优势通道发育有重要控制作用。该研究可为此类油藏储层伤害研究及注水开发调整提供一定指导。
[Abstract]:Based on the characteristics of dominant channel development in unconsolidated sandstone reservoir, a dynamic pore network model considering particle migration and additional pressure loss is established, and the microcosmic factors controlling the formation of dominant channel are studied. The formation rules of dominant channels under different pore throat structure and working system are clarified. The results show that, based on the conventional network model, a mathematical model is established for the behavior of particle shedding, migration and blockage in the pore throat, and the additional pressure loss caused by the dominant channel is considered. Finally, the network model which can simulate the microcosmic development of the dominant channel is established, and the correctness of the network model is verified by comparing the characteristics of the established network model with that of the actual dominant channel. The relationship between the dynamic change of pore throat radius and the size of dominant channel is preliminarily clear, and the reservoir with larger pore throat radius, more coordination number and larger shape factor is easier to form the dominant channel. Displacement pressure difference has a great influence on it. In short, the balance between the blocking of particles in the pore throat and the dredging has an important role in controlling the development of dominant channels. This study can provide some guidance for reservoir damage research and water injection development adjustment in this kind of reservoir.
【作者单位】：中国石油勘探开发研究院;中国石油大学石油工程学院;
【基金】：国家科技重大专项“海外大陆边缘盆地勘探开发实用新技术研究”(2011ZX05030)
【分类号】：P618.13

【相似文献】