页岩油藏多段压裂水平井井距优化研究——以新疆吉木萨尔油田为例

Spacing optimization of multiple fractured horizontal well in shale oil reservoirs:A case study from xinjiang jimusar oilfield

多段压裂水平井的开发方案设计和井距优化是其复杂缝网压裂技术研究的重点内容.针对新疆吉木萨尔页岩油藏,利用不稳定渗流理论建立了多段压裂水平井多井数值模型,基于井间干扰小、储量动用充分的原则,确定典型多段压裂水平井合理井距.结果发现,当井距大于260 m后,单井累计产油量增量趋于平缓.综合累计产油量变化曲线和压力分布图,可确定吉木萨尔多段压裂水平井合理井距范围在260~280 m左右.在两井井距为260 m的条件下进行产量预测,得到生产5年累计产油量为52526 m 3,可看出页岩油的生产主要依赖于前两年生产,后续三年生产影响较小,主要由于控制半径较小所致,可为同类页岩油藏的开发提供科学有效的技术支持.

The design of multiple fractured horizontal wells and the optimization of well spacing are the key tasks in developments of shale reservoirs.Based on the theory of unstable seepage,a multi-well numerical model of multiple fractured horizontal wells was established.Based on the principle of low inter-well interference and full utilization of reservoir,the reasonable well spacing of typical multiple fractured horizontal wells was determined.The result shows that the accumulation of oil production in a single well tends to be flat when the well spacing is larger than 260 m.When the well spacing is 260 m.Based on the curve of cumulative oil production and pressure distribution,it can be determined that the reasonable well spacing range of the fractured horizontal wells in Jimusar oilfield is about 260~280 m.With the 260 m well spacing,the cumulative oil production in the five years of production is 52526 m 3.It can be seen that the production of shale oil mainly depends on the production in the first two years,and the production in the following three years has little impact,due to the small control radius.This work can provide scientific and effective technical support for the development of similar shale reservoirs.