多油层叠合区压裂水平井立体开发技术

多油层叠合区在国内外各大油田均有不同程度的分布,鄂尔多斯盆地三叠系延长组油藏尤为发育。当今水平井开发技术在国内外已经取得了很大进步,但常规水平井开发多油层叠合区时,如何一次性提高储量动用程度和油藏采油速度又成为一个难题。主要针对鄂尔多斯盆地多油层叠合发育区如何一次性经济高效提高储量动用程度和油藏采油速度的问题,研究提出了双层平移式水平井立体开发技术,并通过油藏工程、数值模拟和矿场实践的方法论证该技术的可行性。结果表明,水平井立体开发技术既能提高纵向储量动用程度,又能减少注水投资,提高注水效率和油藏整体采油速度;单井增产幅度大,油藏渗流能力强,注水井分注效果明显,递减期时间较直井开发短。

Tridimensional development technology of fractured horizontal well in Multi layer Overlapping area

Multi layer overlapping area have different degree distribution of major oil fields in domestic and foreign,especially the Triassic Yanchang formation in Ordos Basin. Although the development of technology in the horizontal well have made great progress in domestic and abroad, how to improve the producing degree of reserves and one-time oil recovery rate have become a problem when the conventional horizontal well development of multi layer overlapping area. In order to improve the economic efficiency of the producing degree of reserves and the rate of recovery,author presented a double shift type horizontal well tridimensional development technology and demonstrated the feasibility by the method of reservoir engineering, numerical simulation and field practice.The results show that horizontal wells of tridimensional development can improve the vertical producing degree of reserves, also can reduce the water investment, improve water injection efficiency and the overall recovery rate. The single well production scale increases greatly.The reservoir seepage ability is strong. Separate water injection effect is obvious.Decreasing period is very shortely than vertical wells.