厚油层水驱开发效果及其影响因素分析

Effect and influencing factors on water flooding development of thick reservoir

关云 曹仁义 徐锋 吕文贺 晋剑利2

中国石油大学（北京）石油工程学院，北京102249 中国石油勘探开发研究院，北京100083

Petroleum Engineering College, China University of Petroleum, Beijing 102249, China Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Z油田M区块砂体厚度较大，属于典型的厚油层油藏。在水驱开发过程中，受多种因素共同作用，注入水在纵向上推进不均匀，导致剩余油分布不规律，开发指标难以预测。为评价厚油层油藏水驱开发效果及其影响因素，运用数值模拟方法建立了水驱评价模型，模拟厚油层水驱情况，探究水驱开发效果对油层厚度、地层韵律、渗透率级差、油水黏度比等参数的敏感程度。研究认为：地层韵律和渗透率级差对于水驱开发效果影响较大，油水黏度比次之，油层厚度影响相对小。正韵律地层渗透率级差越大，开发效果越差；反韵律地层有利于厚油层开发，且存在最优反韵律地层渗透率级差，即并非反韵律地层渗透率级差越大开发效果越好。研究划定了油层厚度和油水黏度比影响开发效果的界限，为油田提高采收率措施制订提供了依据。

The M Block of Z Field is a typical thick oil reservoir with thick sandbody. Under the combined action of various factors, the water injection cannot be carried out uniformly in the vertical direction, resulting in irregular distribution of remaining oil and difficult prediction of development indicators. In order to evaluate the effect of waterflooding and its influencing factors in thick oil reservoir, the water flooding model was established through numerical simulation. The effects of waterflooding on the thickness, vertical heterogeneity and oil/water viscosity ratio were studied. According to the research, the effects of rhythm and permeability differential are the most sensitive, followed by oil-water viscosity ratio, and thickness is the least. Higher permeability differential of positive rhythm brings worse development. Inverted rhythm is beneficial to the development and there is an optimal permeability differential of inverted rhythm. Corresponding limits have been defined in the study of thickness and oil-water viscosity ratio, which provide the basis of oil recovery improving measures.

10.6056/dkyqt201806016