针对中深层稠油蒸汽驱调控对策受开发阶段动态特征参数影响较大、难以明确划分蒸汽驱开发阶段等问题,以齐40块蒸汽驱为例,在分析蒸汽腔变化规律的基础上,综合利用动静态监测资料分析、油藏工程计算、数值模拟等多种手段,明确蒸汽驱不同开发阶段的开采规律,筛选注入孔隙体积、可采储量采出程度、含水率及温度等动态参数作为蒸汽驱阶段划分的界限参数。研究结果表明:齐40块蒸汽驱蒸汽突破时注入孔隙体积与转驱前含油饱和度呈线性关系;注入孔隙体积倍数与可采储量采出程度呈截距为零的二阶函数关系。该研究成果在汽驱开发阶段划分过程中可操作性强,为不同类型蒸汽驱井组制订调控对策提供借鉴。
In response to the problems that the controlling countermeasures of steam flooding in middle and deep heavy oil are greatly influenced by the dynamic characteristic parameters of the development stage and it is difficult to clearly divide the development stage of steam flooding, taking the steam injection in Qi 40 Block as an example, the dynamic and static monitoring data analysis, reservoir engineering calculation, numerical simulation and other means were comprehensively used according to the analysis of variation law of steam chamber to define the recovery law of different development stages of steam flooding, and select the dynamic parameters such as injection pore volume, recovery percent of recoverable reserves, water content and temperature as the limit parameters for the division of steam flooding stages. The results of the study showed that the injection pore volume at the steam breakthrough in Qi 40 Block was linearly related to the oil saturation before the flooding conversion; the injection pore volume multiplier was a second-order function with zero intercept with the recovery percent of recoverable reserves. The study results are highly operational in the classification of steam flooding development, and provide a reference for the development of control countermeasures for different types of steam flooding well clusters.
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