基于支持向量机的密井网水驱配注方法研究

发布时间：2018-08-22 08:43

【摘要】：萨中开发区中区西部作为实施二次开发工程的第一个产能建设区块,井网重构、层系重组后,整体开发效果改善,但不同油层开发效果差异大。通过分析认识到区块井组仍然具有提高采收率的潜力,但同时也面临着剩余油分散、油层多、井网密等问题。为了充分考虑层间差异性、储层关联性、压差、物质平衡和能量平衡等对层段注水量的影响,更好的表征各影响因素与注水量之间的非线性关系,提高层段注水量预测精度,建立了基于支持向量机的密井网条件下层段配注方法体系:通过结合油藏工程方法和灰色关联法及层次分析法得到水驱效果好的最佳关联油水井组,运用支持向量回归方法建立层段注水量的计算模型,且模型的平均误差3%,最大误差20%,该模型具有较高的准确性和可靠性。应用该模型对萨中开发区研究区块184口注水井715个注水层段的注水量预测,得到该区块的水驱调整方案,通过数值模拟结果分析可知,调整后该区块的含水率下降0.247个百分点,含水上升速度降低,产油量增加3.8702×104吨,该模型具备足够的精度及现场利用价值。本文通过对注水井及其最佳见效采油井井组的配注系统进行研究,可以推广到中区西部整个注水井网的生产中,得到适用于密井网条件下井组配注的研究成果,可以指导下一步的水驱开发调整,对其他密井网条件下配注工作的研究及推广应用也有重要的指导意义。
[Abstract]:The western part of Sazhong Development Zone is the first productivity construction block in the implementation of secondary development project. The overall development effect is improved after the reconstruction of well pattern and the reorganization of strata, but the development effect of different reservoirs varies greatly. Through analysis, it is recognized that the block well group still has the potential to improve oil recovery, but it also faces the problems of remaining oil dispersion, more oil layers and well pattern density. In order to fully consider the influence of interlayer difference, reservoir correlation, pressure difference, material balance and energy balance on the water injection rate, the nonlinear relationship between the influencing factors and the water injection rate is better characterized, and the prediction accuracy of the interval water injection rate is improved. Based on support vector machine (SVM), the injection allocation system for the lower section of dense well pattern condition is established. By combining reservoir engineering method with grey correlation method and analytic hierarchy process (AHP), the best associated oil-water well group with good water flooding effect is obtained. The support vector regression method is used to establish the model for calculating the water injection rate in the interval. The average error of the model is 3 and the maximum error is 20. The model has high accuracy and reliability. The model is used to predict the water injection rate in 184 injection wells and 715 water injection zones in Sazhong Development Zone, and the water drive adjustment scheme of this block is obtained. The results of numerical simulation show that the water cut of this block decreases by 0.247 percentage points after the adjustment. With the decrease of water cut and the increase of oil production by 3.8702 脳 10 ~ 4 tons, the model has enough precision and value of field utilization. By studying the injection system of water injection wells and their best effective production wells, this paper can be extended to the production of the whole water injection well pattern in the western part of the central district, and the research results suitable for the well distribution under the condition of dense well pattern are obtained. It can guide the adjustment of water drive development in the next step, and it is also of great significance to the research and popularization of injection allocation under the condition of other dense well pattern.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE357.6

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