层系组合开发对驱油效果影响的实验研究

Experimental Study on the Effect of the Combination Development of Strata on Oil Displacement

为了研究海上稠油油田层系组合开发对驱油效果的影响,根据S油田物性资料,构建目标研究井组的实验模型,研究纵向非均质性对开发效果的影响。在数值模拟实验的基础上,采用三维平板物理模型,借助电极检测含油饱和度法和低场核磁共振技术,分别对不同层系组合开发方式对驱油效果的影响进行实验研究。结果表明,在本次实验条件下,当级差大于8时,采出程度随级差增大而降低的幅度趋于平缓,这是由于级差足够大时,笼统注水的层间干扰现象明显,采出程度的大小主要依赖于高渗层的贡献。多层系组合开发时,如果可以采用分注分采的细分层系开发模式,那么整体采收率较笼统注水开发有所提升,本次实验条件下提升6.06个百分点;如果采用笼统注水开发模式,那么在含水突进时采用一定程度的井网调整措施改善油水分布,也可以提高采收率。控制合采和分采的转换节点,提高整个驱替阶段的采收率,对现场有很重要的借鉴意义。

In order to study the influence of the combination development of offshore heavy oil reservoir series on the oil displacement effect,according to the physical property data of S oilfield,the experimental model of the target well group was constructed to study the influence of the vertical heterogeneity on the development effect.On the basis of numerical simulation experiment,using three-dimensional plate physical model,with the aid of electrode detection oil saturation method and low field nuclear magnetic resonance technology,the influence of different combination development modes on oil displacement effect was studied.The results show that under the condition of this experiment,when the level difference is greater than 8,the degree of recovery decreases gradually with the increase of the level difference.This is because when the level difference is large enough,the interlayer interference phenomenon of general water injection is obvious,and the degree of recovery mainly depends on the contribution of high permeability layer.In the combination development of multi-layer system,if the development mode of subdivided layer system with separate injection and separate production can be adopted,the overall production will be carried out Compared with the general water injection development,the recovery is increased by 6.06 percentage points under the experimental conditions.If the general water injection development mode is adopted,some well pattern adjustment measures are adopted to improve the distribution of oil and water,and the recovery can also be improved.It is of great significance to control the conversion nodes of combined production and separate production,and improve the recovery in the whole displacement stage.