低密度钻井液的开发与应用

第三讲　中心取样钻探工艺中心取样钻探工艺根据所选用钻具的不同而异 ,中国地质科学院勘探技术研究所研究并经过试验验证可实现中心取样钻探工艺的基本钻具组合方式有 6种 ,如图 3- 1所示。不同的钻具组合所适应的地质条件如表 3- 1所示。图 3 -1　中心取样钻探钻具组合Ａ—常规潜孔锤钻具组合 ;Ｂ—贯通式潜孔锤钻具组合 ;Ｃ—牙轮钻具组合 ;Ｄ—硬质合金钻具组合 ;Ｅ—复合片钻具组合 ;Ｆ—刮刀钻具组合1—双壁钻杆 ;2—转换接头 ;3—常规潜孔锤 ;4—贯通式潜孔锤 ;5—牙轮钻具配气接头 ;6—牙轮钻头 ;7—岩心卡断器 ;8—硬质合金钻头 ;9…

Development and Application of Low Density Drilling Fluid

DMZ low density solid free drilling fluid is mainly comprised of water, high molecular polymer and natural high molecular compound. It's density ranges from 0.999 to 1.004 g/cm 3. It possesses good quality of anti caving, protecting wall and flocculating. The problems occuring in small diameter wire line coring drilling, such as slurry cake in inner face of drilling rod, low carrying capability, high water loss and so on, can be solved with it.