The influence of glass beads for drilling fluid lubricity
Glass beads spherical structure, which has high hardness, smooth surface, such as features, rolling performance is good. Use it as drilling fluid additives, can play a role similar to the bearing in the ball, greatly reduce the frictional resistance of drill pipe, drilling fluid, fast bit drilling, improve the rate of penetration, and reduce the bit wear.In the experiment, the Caspian sea region with diameter less than 0.9 mm of glass beads, adding quantity is 5 ~ 20 kg/m3, the results make it required torque drill pipe reduced 30% ~ 60%.
Now, in the exploration and development is difficult, purpose layer under the condition of buried depth, low formation pressure with application of glass beads in underbalance drilling has many advantages, one of the biggest advantages is the glass beads can improve drilling speed; From the shaft to the differential fluid pressure of formation fluid in the range of 0 ~ 6.9 Mpa, the common drilling method in sandstone, limestone, shale drilling efficiency would lower 70 ~ 80%, and the glass beads can reduce wellbore pressure significantly improve drilling efficiency.
This article from the guest baba
