... operation axial force assumption finite difference scheme magnitude parabolic mode mechanical behavior vibration magnitude society of petroleum engineers vibration soft string model hook load trapezoidal mode Introduction The most conventional torque and drag model is the soft string...

... equation: (1) ρA dv dt = ∂ F ∂ s + ρAg cos φ In equation (1) , ρ is the pipe density, A is the pipe cross-section area, v is the pipe velocity, F is the pipe axial force, t is time, s is length along the pipe axis, g is the gravitational constant, and φ is the inclination...

... extended to the calculation of the burst SF and the connection SF for arbitrary load combinations. The new SF is named the "radial safety factor." It must meet the following requirement: when all the tubular loads (such as axial force, internal pressure, and external pressure) are scaled by this SF...

... of solutions are obtained for the helix configuration and the radial contact force under the conditions of applied axial force and initial residual bend. These solutions are used to analyze axial load transfer and extended-reach capability of coiled tubing on horizontal wells. It is shown that in a horizontal...

... upstream oil & gas high-pressure application string rating lockup compression ratio axial force thickness wellbore application bottom end pressure test coiled tubing operations wall thickness extended-reach test differential envelope society node petroleum engineer correspond...

... conditions is described. The results are compared with published solutions for vertical wells and explained for a field case of deviated well. concave side downhole intervention completion installation and operations directional drilling axial force spe 26511 drillstring design friction force...

... converts the lateral motions to sinusoidally varying axial forces and tangential impulses acting on the BHA. The entire string is then analyzed for wave propagation of the axial forces and torsional impulses. In this manner, the dynamic axial and torsional response at the top of the drillstring can be used...

... program (ADHOC) developed to implement it. The formulation is fully general, and is applicable to a wide range of casing design problems. axial force wellhead poisson service life analysis annulus pressure casing design piston calculation society of petroleum engineers spe 22871 stiffness...

...-random drill bit vibration amplitude variation rotation drill bit vibration drillstring dynamics vibration torsional mode drillpipe spe 16660 friction force calculation resonance axial force compartment drillstring design frequency drill bit rotation rate displacement petroleum...

.... Write: 6200 N. Central Expressway, P.O. Drawer 64706, Dallas, Texas 75206. NOMENCLATURE NOMENCLATURE Abbreviation Expansion d i inner diameter of casing at the top, m F bp axial force due to combination of "ballooning" and to "piston" effect, /+ tension, - compression/, kN F ℓ...

... of the drillstring are assumed to be properties of the drillstring are assumed to be piecewise constant. piecewise constant. Upstream Oil & Gas boreholeaxis tool joint Drilling Equipment dbh 30-ft steel collar inclinationof curved borehole borehole computerprogram piecewiseconstant axial force...