可循环空气泡沫钻井技术在元坝10井的应用

针对川东北地区上部陆相地层砂岩、泥岩、页岩互层频繁,硬度大,研磨性强,常规钻井液钻井机械钻速低,而气体钻井由于地层出水无法顺利进行的技术难点,研发了适合该地区上部地层钻进的空气泡沫流体配方,研制了HX-350型环隙式机械消泡器,形成了可循环空气泡沫钻井技术。元坝10井660.4mm导眼段应用了可循环空气泡沫钻井技术,该井段的平均机械钻速为4.88m/h,与邻井常规钻井液钻井井段相比,平均机械钻速提高了3倍;消泡器消泡效果显著,累计回收泡沫基液2 230m3,节约清水2 230m3,污水处理量减少2 230m3,并大大减少了发泡剂的消耗。应用结果表明,可循环空气泡沫钻井技术能有效解决大尺寸井眼的携岩问题,实现泡沫基液的循环利用,大幅度降低泡沫钻井成本,具有广阔的推广应用前景。

Application of Recycling Air-Foam Drilling Technology in Well Yuanba-10

The upper formation of Northeastern Sichuan Basin is characterized by sandstone interbedded with shale and clay with high rock hardness and abrasiveness.The rate of penetration(ROP)of conventional drilling is very small,and gas drilling can not be used due to the formation water influx.In order to solve this,the air-foam drilling fluid and HX-350 annular mechanical foam breaker were developed which resulted in the recycling air-foam drilling technology.The application results in Well Yuanba-10 in 660.4 mm section show that the ROP was 4.88 m/h,which is 4 times faster than conventional drilling.The defoam results of the HX-350 foam breaker was obvious.Total 2 230 m3 foam was reused,2 230 m3 of water was saved and reduced processing volume of 2 230 m3.The difficulty of cuttings transport in large diameter well section was solved with this technology and the foam based fluid can be reused,which significantly reduce the air-foam drilling cost.