二连盆地吉32块稠油热采特征及后续开采方式研究

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方法根据吉32试验区的地质条件,结合生产实际,应用干扰剔除法和数值模拟技术,进行蒸汽吞吐开采特征研究,提出了后续开采方式。目的研究生产特征、优选合理的技术参数,为该区稠油大规模开发提供依据。结果采用70m井距正方形井网蒸汽吞吐方式生产四个周期后,蒸汽吞吐生产阶段基本结束;蒸汽吞吐效果集中在前两个周期,该阶段产量递减快、无稳定生产期;注汽井间干扰频繁,使回采水率高,并且含水曲线呈锯齿状;注汽强度、注汽速度均较低;注汽压力随周期增加而降低。结论选择合理的油层厚度,既能保证热采的地质基础,又能减小层间差异;优选合理的注汽参数,可保证蒸汽质量,充分利用注入热能,扩大波及体积;井间干扰对提高蒸汽吞吐效果有利,但应避免汽窜;该区后续开采方式不适合蒸汽驱,应先补孔,然后注入120℃热水驱开采 Methods Based on the geological conditions in the experimental area of ​​Ji32, combined with the actual production, the characteristics of steam huff and puff extraction were studied by means of interference elimination and numerical simulation, and the subsequent mining methods were proposed. Objective To study the characteristics of production, optimize the reasonable technical parameters and provide the basis for the large-scale development of heavy oil in this area. Results The production process of steam huff and puff was basically completed after the four-cycle steam stimulation with square well pattern of 70m was completed. The results of steam huff and puff were mainly concentrated in the first two cycles, the output decreased rapidly and no stable production period occurred. Frequent, so that the water recovery rate is high, and the water curve was jagged; steam injection intensity, steam injection speed are lower; steam injection pressure decreases with increasing cycle. Conclusion The reasonable thickness of oil reservoir can not only ensure the geological foundation of thermal recovery but also reduce the difference between layers. Optimizing the parameters of steam injection can ensure the steam quality, make full use of the injected thermal energy, enlarge the wave volume and increase the interference between wells Steam huff and puff is beneficial, but steam channeling should be avoided. The follow-up mining method in this area is not suitable for steam flooding. The hole should be filled first and then poured into 120 ℃ hot water flooding
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