鄂尔多斯盆地长7页岩油藏水平井生产制度

为合理制定长7页岩油藏水平井的生产制度,保障长7页岩油藏的单井产量,基于鄂尔多斯盆地长7页岩油藏开发的理论研究与生产资料,通过计算水平井体积压裂后人工裂缝缝内压力传播距离与时间的关系,以传播到边界的压力不随时间变化的原则确定合理闷井时间为40 d;高含水排液阶段结束的标志是采出水矿化度分析值与原始地层水相近或水平井压裂液置换率大于60%;通过定量分析水平井单段及百米水平段生产规律,建立动态关系式,确定各阶段合理的产液量。

Production System of Horizontal Well in Shale Oil Reservoirs of Chang 7 Member,Ordos Basin

To ensure the production of shale oil in Chang 7 member, Ordos basin, this paper discussed the production system of the horizontal well in Chang 7 member based on the theoretical research and production data. By establishing the relationship between the distance of the pressure propagation boundary from fractures induced by volume fracturing in horizontal well and the time, and assuming that the pressure propagated to the boundary does not change with time, the reasonable well soaking period is determined to be 40 d. It is considered that the high-watercut drainage stage ends when the analyzed salinity of the produced water is similar to the salinity of initial formation water, or the replacement rate of fracturing fluid in horizontal wells is greater than 60%. By quantitatively analyzing the production profile of a single section and a 100-m horizontal section in the horizontal well, the dynamic relationship was established for determining a reasonable fluid production for each stage.