... bit selection drilling operation bit design oscillation torque coupling RPM regime rotation bit-rock interaction law cleaning Upstream Oil & Gas correspond coefficient stick-slip vibration interaction stick-slip oscillation experiment torsional vibration vibration...

... allowed rotation of a fault-bounded middle block into the pit. This created a zone of tension that eventually mobilized plane shear of a highly weathered surficial upper block. The complex displacement mechanism was inadequately simulated by limit equilibrium models. The mechanism was reproduced using...

... rebound amplitude with rotation. With this induced rotation, the normal rebound velocity is reduced but the tangential velocity is increased. Three empirical formulas are proposed for Rn estimation under the various modulus an different shapes of boulder. construction materials wellbore integrity...

... Reservoir Characterization Reservoir Compaction Upstream Oil & Gas compaction rotation experiment grain fragmentation laboratory microscopy reservoir geomechanics Castlegate porosity compressive stress Fredrich US government breakage AE activity society of petroleum...

... discontinuous deformation analysis (DDA) technique to rock fall simulations. In order to make the method meet the practical requirements, the original DDA has been improved in the following aspects: 1). reducing error from large rigid body rotation; 2). considering damping effect due to resistance in the air...