吉木萨尔页岩油水平井开采实践

准噶尔盆地吉木萨尔凹陷芦草沟组页岩油矿场开发试验表明,纵向上不同地质甜点,平面上同一甜点层的不同区域水平井生产特征差异很大,水平井单井产能及EUR主控因素不清,给油藏开发方案编制、储层改造方式选择和效益评价带来了诸多困难。为此,通过地震、录井、分析化验一体化综合研究,明确了源储高频互层的地质特征,源储配置和保存条件是影响芦草沟组含油性的先天因素;利用特殊测井、微地震监测明确了水平段长度、复杂缝网是影响产能的重要因素;利用室内物模实验,结合油藏生产动态综合分析,初步确定了压裂后水平井合理的排采制度。研究认为,页岩油甜点体具有较强的非均质性,高优质甜点钻遇率和改造缝网复杂程度最大化是提高水平井产能必须追求的目标,合理的排采制度有利于充分发挥水平井的生产能力。

The Horizontal Well Exploitation Practice of Jimsar Shale Oil

Shale oil field of Lucaogou Group Jimusar Sag in Junggar Basin development test shows that horizontal wells in different areas at the same sweet spot layer greatly in production, and that sigle well productivity and mayor controlling EUR factor are not clear and have brought difficulties to reservoir development scheme establishment, reservoir reconstruction mode choice and benefit evaluation has brought many difficulties. Therefore, through integrated researches of seismic, logging, analysis and laboratory testing, the geological characteristics of the high-frequency interbed of source and reservoir are defined. The source and reservoir configuration and preservation conditions are the congenital factors affecting the oil bearing of the target reservoir. Using special logging, microseismic and fluid production profile monitoring, we find that the length of horizontal section and complex fracture network are important factors affecting productivity. Based on the laboratory model test and the comprehensive analysis of reservoir production performance, the reasonable drainage and production system of horizontal well after fracturing is preliminarily determined. According to the research, the sweet spot of shale oil has strong heterogeneity, and the high quality sweet spot penetration rate and the maximum complexity of fracture network reconstruction are the goals that must be pursued to improve the productivity of horizontal wells, and a reasonable drainage and production system is conducive to giving full play to the production capacity of horizontal wells.