... node pdl centralizer pre-drilled liner standoff estimation deformable string contact force standoff stiff-string model stiffness drill pipe selection displacement radial clearance drillpipe perforation bow-spring centralizer scenario Introduction Poor displacement efficiency...

... drilling conference contact force vibration lateral displacement lateral vibration displacement forced vibration modeling approach excitation frequency eigen value Introduction During drilling operations, high drillstring vibrations may be induced from various excitation sources...

... to that, the equation-based method mainly focuses on the prediction of buckling initiation and is incapable of computing the post-buckling shape of the drillstring due to the limitation of the underlying T&D model. Gaining accurate evaluation of contact force and bending moment increment of buckled tubulars...

... introduced by some oscillation tools, and more complex loads, like contact forces, which depend on both the displacement and velocity of each node. More details on the model could be found in the works of Nguyen et al. (2020) and Tran et al. (2019) . Well-Drillstring Contact Model The contact loads...

... dynamic contact forces can act to reduce the effective weight on bit. The contact forces that push a stabilizer blade to be constrained within a borehole include both static and dynamic components. The dynamic forces are difficult to visualize as they are generated by the BHA in motion, and a well...

... Directional Drilling stick-slip behavior mud motor burst data steerable mud motor torsional oscillation power section BHA bit sub drilling operation Exhibition stick-slip response contact force SPE IADC Drilling Conference Drilling RPM vibration rotation speed Introduction...

... Reservoir Surveillance Upstream Oil & Gas formula production monitoring Drilling Equipment tension force flow rate string elongation drillstring design drilling operation accuracy pressure drop elongation effect coefficient thermal expansion axial friction coefficient contact force ROP...

... = ( D t j 2 ) − R i n + 0.5 [ ( 4 R i n 2 − W 2 ) − ( 4 ( D t j 2 ) 2 − W 2 ) ] Normal Contact Force The friction factor is a key parameter in torque and drag modeling because it characterizes the surface...

... Artificial Intelligence friction factor torque string model drillstring design displacement soft string model dynamic axially-stiff string model contact force hookload Upstream Oil & Gas static friction operation configuration wellbore equation trajectory friction...

... society of petroleum engineers lift force reference hook load hook load contact force friction coefficient Upstream Oil & Gas drilling operation buoyant weight friction force axial friction coefficient buoyancy axial friction concentration coefficient inclination weight reduction mud...

... a Modulation index (-) b Transient twist factor (-) C Compliance (rad/Nm) c Curvature (1/m) c 0 Base curvature (1/m) f Specific contact force (N/m) F Tension force (N) g Acceleration of gravity (m/s 2 ) G Shear modulus...

... of the drilling conditions downhole, including the downhole weight on bit and torque on bottom. The novelty of the proposed model is the ability to estimate a more realistic bending effects, accurately predict the contact forces between the drillstring and the wellbore, and solve T&D parameters from surface...

... to predict the critical vibration modes, resonances and contact forces was also carried out. The analysis of the wells showed that while the bottom hole assemblies displayed very little torsional or lateral vibration; the upper drill string components were exposed to high energy lateral vibrations. The high...

... with a full-sized test machine. They performed their study using three grades of casing (K55, N80, and P110), both oil-based and water-based muds, and for contact forces of 1,000 and 2,000 lbf. By measuring both the casing wear and friction forces, they propose a linear wear-efficiency model that relates...

... calculation dynamic soft string model drillstring design Upstream Oil & Gas different acceleration velocity profile parabolic velocity profile parabolic velocity drillpipe contact force s-shaped wellbore wellbore Directional Drilling wellbore trajectory surface load trapezoidal unit...

... are compared and it is shown that depending on the drillpipe specification, applied torque, axial load and Dogleg Severity (DLS) of the wellbore, one type can function better than others and a one-size-fits-all is not an appropriate approach on the selection of drillpipe material. Generated contact forces...

..., experimental studies of actual drillstrings have shown the potential to develop contact forces for lateral buckling that are significantly larger than predicted by smooth-pipe models. Thus, by the discrete-point assumption, we resolve two problems: bending moment continuity and underprediction of lock-up...

... weight, contact force, and friction force: (6) μ = − 0.5 D p k h Where: w = weight of the drillstring length in the mud per unit length p = contact force per unit length The contact force is dependent on a penetration of drillstring into the wellbore wall: p...

... to calculate the contact force for each set of casing sizes and rotations. The force then used as the new boundary conditions in finite-element models and mud cake failure was evaluated. The results indicate that casing rotations up to 100 rpm cannot result in mud cake failure; however, this cannot...

... axial forces, both strings will buckle, and the resulting buckled configuration must fit together so that contact forces between the two strings are positive and the pipes do not each occupy the same space. If the two strings have an external, cylindrical rigid wellbore, then any contact forces...