New method of using seismic velocity to predict layer drillability and drilling rate 利用地震层速度预测地层可钻性和钻速的新方法
Rop rate of penetrate 机械钻速
Drilling - time log 钻速曲线
But now the use of the spherical one - cone bit shows that the teeth are abrade heavily in advance , which affects the velocity and life of the bit 但是目前油田上使用的球形单牙轮钻头由于牙齿先期磨损严重,影响了钻头的机械钻速和寿命。
Field operation shows that , by using the hydrodynamic propulsor , not only the penetration rate is increased , the vibration of the bit and drill stem is reduced as well , thereby the service life of the bit is extended 1995 - 1998年井下液力推进器在大港油田等地区不同区块20余口井上施工的实践证明,使用这种推进器不但可以提高机械钻速,而且减轻了钻头和钻杆的振动,进而延长了钻头寿命。