低渗透裂缝性油田复合射孔注水技术研究

Technique for Combined Water Injection and Perforation in Low Permeability Fracture Oilfield

红岗北油田于2004年底投入开发,由于存在东西向天然微裂缝,造成东西向油井暴性水淹。对常用油层改造方法适用范围进行分析对比后,确定采用复合射孔技术,对注水层段进行改造。根据油层发育状况不同,采用变参数射孔技术,并且增加脉冲次数,从而提高油层渗透率;另外,通过控制注水压力在裂缝启动压力之下,确定东西向油井合理穿透率,进一步降低了注入水沿裂缝推进的机率。应用后东西向油井暴性水淹得到了有效控制,采收率提高5%左右。

In Honggangbei Oilfield oil production started in 2004,waterout was caused because of microfracture existed in east-west direction.Based on the comparison and analysis of sphere of application of reservoir reconstruction,combined perforation is adopted to reconstruct the injection layers.According to the difference of development of oil layers,perforation technique of variable parameter is adopted,moreover,the frequency of impulse is increased,which increases the permeability of oil layer;besides,by controlling the pressure of injection under the actuating fracture pressure,the rational permeability of oil well in east-west direction is confirmed,and the probability of induced water drived along fracture is further decreased,after application,the waterout in oil wells is effectively controlled,and recovery rate is raised about 5%.