脉冲大电流放电引爆含能材料产生冲击波的储层改造

Transformation of oil-and-gas reservoir with shock waves by high current pulsed discharge ignited energetic materials explosion

介绍了复合电热化学法产生冲击波的机理和冲击波改善储层物性的机制;给出了脉冲大电流引爆含能材料弹丸的结构和典型的放电参数,开展了冲击波致裂储层的实验研究;检测了样品在冲击作用下的动态应变及影响储层解吸附特性的关键参数(包括孔隙度、渗透率、抗拉、抗压强度等),并在实验前后进行了测量和对比。研究表明,电热化学法产生的冲击波可在圆柱形砂岩样品上产生幅值为1000με~1500με的应变量,使砂岩出现了宏观裂缝;样品平均孔隙度由15.24%增至15.62%,平均渗透率由1.749 09×10^(-3)μm^2增至2.467 08×10^(-3)μm^2;抗压、抗拉和抗剪强度均下降了约30%。

Composite electro-thermal chemical explosion(CETCE)was used to generate strong shock waves(SWs).This paper introduces the mechanism and effects of SWs generated by CETCE on reservoir stimulation and gives the discharge parameters and discharge load structure used to ignite energetic materials(EMs).The SW fracturing effects experiments were carried out.The dynamic strain and desorption related parameters,including porosity,permeability,strengths of extension and compression were measured and compared with those before the shock experiments.The results show that,the SWs generated by CETCE can generate the dynamic strain of 1000με-1500με,and visual cracks appear on and in the samples.The average porosity of sample increases from 15.24% to 15.62%,average permeability increases from 1.749 09×10^(-3)μm^2 to 2.467 08×10^(-3)μm^2,and strengths of extension,compression and shear decrease by about 30% overall.