| 摘要 |
<p>A combined fracturing and perforating method and device for oil and gas well are disclosed. The method and device can fracture deeply a formation while perforating. The method utilizes an explosion of perforating charge (5) in a combined fracturing perforator to ignite primary gunpowder in the perforator, and burning of the primary gunpowder ignites secondary gunpowder in the perforator; the time difference between a pressure peak of the primary gunpowder and a pressure peak of the secondary gunpowder is 5-10 milliseconds, thus forming an energy complementation, and forming a continuous high-pressure state in the hole, and extending the length of crack. The primary gunpowder is mainly composed of ammonium perchlorate and hydroxyl terminated polybutadiene, and the secondary gunpowder is mainly composed of ammonium perchlorate and polyether. The gun body of perforating gun in the combined fracturing and perforating device is provide with a pressure releasing hole (8) which is directly facing the jet direction of perforating charge; a sealing sheet (9) is arranged on the pressure releasing hole (8). An inner gunpowder box (6) and an outer gunpowder box (7) are installed on the cylindrical charge frame (4), wherein the inner gunpowder box (6) which contains the primary gunpowder is mounted in the cylindrical charge frame (4), and is located between the adjacent shaped-charge perforating charges, and the outer gunpowder box which contains the secondary gunpowder is attached to the outer wall of the cylindrical charge frame (4).</p> |
