DEVELOPMENT AND DISCUSSION OF NEW TECHNOLOGY OF SHALE GAS EXPLORATION AND EXPLOITATION

The current situation of shale gas development was surveyed,the key technologies of shale gas development were summarized and discussed,including geological reserves evaluation technology,perforation optimization technology,fracturing technology,horizontal well technology,supercritical CO2 technology,underbalanced drilling technology etc.Because the water fracturing technology is easy to hurt reservoir,and cost is high,the supercritical CO2 development technology of shale gas was discussed.This technology had high rock-breaking efficiency,low threshold pressure,and could effectively reduce underground complex problem.The fracture fluid hadn't solid-phase particle,so,pore wasn't blocked,the clay expansion wasn't caused,the harms of water-blocking and rock wettability reversal were avoided,and reservoir was protected effectively during drilling.Aiming at lost circulation and slow drilling speed,the air drilling and aerating drilling technology were used to enhance drilling speed and deal with lost circulation,and the good effect was achieved through field application.