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首页> 外文会议>SPE Production and Operations Symposium >Down Hole Pressure Variation Due to Axial Stick Slip Motion Effect on Drill String
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Down Hole Pressure Variation Due to Axial Stick Slip Motion Effect on Drill String

机译：由于钻柱轴向杆滑动运动效果导致的孔压力变化

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In order to predict downhole surge and swab pressure variation due to movement of the drill pipe, the Stribeck friction model has been outlined to analysis the friction induced stick slip motion in inclined bore holes. This model describes the axial stick slip motion of the drill string through four regimes of contact including sticking, boundary lubrication, partial fluid lubrication and full lubrication. The results from the single degree of freedom (dof) model are compared with the Coulomb friction model. The results indicate significant increase in peak velocity of the lower part of the drill string and Bottom Hole Assembly (BHA) compared to the velocity of the drillstring at surface, i.e., during drill pipe connection using a MODU (Mobile Offshore Drilling Unit). Simulations also show that the wave form of the downhole drill string motion will be different compared to the surface motion due to the stick phase caused by variation of contact force between the drillstring and the borehole in the curved section of the bore hole. In long high deviated boreholes, the movement of the BHA and the corresponding surge and swab pressure during drill pipe connection will be low or negligible due to high drag force and elasticity of the drill string.
机译：为了预测由于钻管的运动引起的井下浪涌和拭子压力变化，已经概述了Stribeck摩擦模型，以分析倾斜孔洞中的摩擦诱导的粘液滑移运动。该模型描述了钻柱的轴向杆滑动运动，通过四个接触制度，包括粘附，边界润滑，部分流体润滑和全润滑。与库仑摩擦模型进行比较了单一自由度（DOF）模型的结果。结果表明钻柱和底部孔组件（BHA）下部的峰值速度的显着增加与表面的钻头纹的速度，即使用MODU（移动海上钻孔单元）在钻杆连接期间。模拟还表明，由于钻孔和钻孔的弯曲部分中的钻孔部分之间的接触力和钻孔之间的接触力变化引起的粘隙相比，井下钻柱运动的波形将与表面运动不同。在长的高位偏离的钻孔中，由于钻柱的高牵引力和弹性，BHA的运动和钻杆连接期间的相应浪涌和拭子压力在钻杆连接期间的运动将是低或可以忽略的。

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