页岩储层液态药爆炸压裂机理研究

Study on fracturing mechanism of liquid explosive in shale reservoir

针对我国页岩储层地质特征及爆炸压裂技术的优点,开展了页岩储层液态药爆炸压裂机理研究。通过页岩储层结构弱面发育分析、脆性分析以及液态药爆炸压裂水泥靶实验证明爆炸压裂可使页岩产生裂缝,同时也说明在页岩气井采用液态药爆炸压裂随机在页岩层中产生多条裂缝。结合液态药爆炸压裂技术与其他压裂技术对比,得出液态药爆炸压裂可以形成不受地应力控制的复杂缝网,且会使地层剪切错动形成自支撑、无需支撑剂、对储层伤害极低、施工简单等特点。该研究不仅为页岩气的开发提供新的研究思路,也对非常规天然气的开发具有指导意义。

Aiming at the geological characteristics of shale reservoir and the advantages of explosive fracturing technology in China, the mechanism of explosive fracturing with liquid explosive in shale reservoir was studied. Through the analysis of shale reservoir structure weak plane development, brittleness and the experiment of liquid explosive fracturing cement target, it is proved that explosive fracturing can cause shale cracks. At the same time, it also shows that the explosive fracturing with liquid explosive in shale gas well can produce multiple cracks randomly in shale formation.Combined with the comparison of explosive fracturing technology with other fracturing technology, it is concluded that explosive fracturing with liquid explosive can form complex fracture network which is not controlled by in-situ stress, and can cause formation shear dislocation to form self-supporting,without proppant,extremely low damage to reservoir and simple operation. This study not only provides new research ideas for shale gas development, but also has guiding significance for unconventional natural gas development.