水中脉冲激波对模拟岩层破碎试验

采用重复频率液电脉冲激波轰击油气井射孔及附近岩层,可提高油气井的固有渗透率,增加油气产量。本文建立水中大电流脉冲放电激波试验平台,构建电气、激波及光学等监测系统,分析水中脉冲激波与电弧膨胀及空腔运动的对应关系;分析液电脉冲激波能量的转换效率及频谱特性,采用混凝土试样模拟油气井护套及射孔周围岩层。测试了激波强度及放电次数对射孔堵塞物的清理效果,模拟了激波对岩层的造缝效果。试验结果表明,采用重复频率液电脉冲激波轰击射孔堵塞物及作用周围岩层,能够有效解除油气井的堵塞,增加岩层裂缝,提高油气产量。

Experiments on the Fracture of Simulated Stratum by Underwater Pulsed Discharge Shock Waves

Under repetitive dynamic shock waves, the blockage at the oil well perforation can be broken and removed from the bore-hole wall, and the fracture to increase the permeability of the hole-bottom region can be formed. Then the oil production of the well is improved. In this paper, a test platform of the oil well stimulation based on the electrohydraulic shock waves was designed and constructed. The electrical parameters, shock wave intensity, and expansion process of the plasma channel and cavity were observed. The preliminary experiments were carried out on some hollow cylinder concrete specimens. The influence of the injected electrical energy and the applied shock wave shot number on the fracture of the specimen was investigated. The experimental results show that the shock wave can increase the permeability.