不同水淹程度油层组合对油田开发效果的影响

INFLUENCE OF DIFFERENT WATERFLOODED-DEGREE OIL-LAYER COMBINATIONS ON THE OILFIELD DEVELOPMENT

目前大庆油田已进入高含水开发阶段，由于不同渗透率油层的水淹程度不同而引起的开发效果变差的现象已经显现，冈此对油层组合开发水淹程度及含水饱和度的界限研究十分必要。利用ECLIPSE数值模拟软件，研究了不同水淹程度油层组合对于开发效果的影响，计算了不同水淹程度对采出程度及含水率的影响，并且给出了与未水淹油层（渗透率为50×10^-3μm^2）组合开发的界限。结果表明，当开发时间为30年时，未水淹与低水淹的组合开发效果最好，采出程度为32．78％；中水淹与高水淹的组合开发效果最差，采出程度仅为9．48％；不同水淹组合的单层采出程度差异较大，当含水98％时，与水淹程度高的油层组合开发时间短，采收率低。渗诱率为50×10^-3μm^2的未水淹’7南屡与高渗油层组合开学的初始含水佝和摩界限为40％～50％．

At present, the development of Daqing Oilfield has entered into high watereut stage and its effects are becoming bad due to the different waterflooded degrees for the oil layers with different permeabilities. So it is necessary to research the thresholds of the waterflooded degree and water saturation for the commingled oil layers. ECLIPSE numerical simulating software is used to study the influence of the above combination development effects and calculate the impacts of different waterflooded degrees on the oil produced ratio and water cut. And furthermore, the threshold of commingled development with non-watered oil layers （their permeabilities are all 50×10^-3μm^2） is also provided. The results show that when the development time is up to 30 years, the performance of the combination between non and low-waterflooded oil layers will be best, the produced ratio will reach 32.78% ; on the contrary, the combination development results between medium and high-waterflooded oil layers will be worst, the produced ratio will only be 9.48% ; the produced ratio differential of each individual layer in different combinations is rather larger. When the water cut reaches 98% , the development time of those oil-layer combinations with high waterflooded one is comparatively short and the recovery factor of the above is relatively lower. The initial water saturation threshold of the combination development between non-watertlooded （K = 50×10^-3μm^2） and high- permeability oil layers is between 40% and 50%.