Sensitivity of resistance forces to localized geometrical imperfections in movement of drill strings in inclined bore-holes

Gulyayev, V.I.; Khudoliy, S.N.; Andrusenko, E.N.

doi:10.12989/imm.2011.4.1.001

Cited by 14 publications

(12 citation statements)

References 6 publications

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“…As our theoretical results demonstrated, in doing so, the value of parameter η influenced essentially on the possibility to perform the designed operation[10,12]. Thus, enlargement of the η value entails increase of…”

mentioning

confidence: 77%

“…Often, their drivage is accompanied by emergency situations and failures. Amidst them, there are -loss of the bending stability of the drill string under action of gravity forces, torque, inertia forces of rotary motion, etc [1,6,9,10,13,15,17,20]; -self-excitation of torsion autovibration of the drill bit accompanied by alternation of its fast and slow motions [2,4,7,8,11,19,22]; -generation of whirling vibration of the bit connected with instability of the whole system and transition of the bit motion from the regime of pure spinning to its rolling on the bore-hole bottom [5,18,21]; -locking up and sticking of the drill strings in the zones of the bore-holes with enlarged contact and friction forces [3,12,14,16,23]. But the drivage of curvilinear bore-holes is fraught with great technological difficulties caused by permanent balance change of the forces of gravity, resistance (friction), inertia, and elasticity acting on the drill string and its bit.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, the cases were analyzed when the axial line of the DS could have geometrical imperfections in the shapes of harmonic [12,23] and spiral [9] wavelets, as well as smoothed breaks [10]. It was demonstrated that the localized geometrical distortions, even though they have small magnitudes, could initiate significant enlargements of the resistance forces and thereby be the cause of the DS sticking.…”

Section: Introductionmentioning

confidence: 99%

“…with respect to s and compare the result with the two first equations of system(10). After some rearrangements, one can gain the expressions for the components of the contact force…”

mentioning

confidence: 99%

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Computer Simulation of the Least Energy Consuming and Emergency-Free Regimes of Drilling of Hyper Deep Curvilinear Bore-Holes

2013

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The problem of computer simulation of mechanical behavior of drill strings in hyper deep vertical, inclined and horizontal bore-holes is stated with the aim of forecasting the possible initiation of emergency situations during carrying out drilling operations. The question of stability and post-critical non-linear deforming and dynamics of the drill strings are considered. It is shown that all of them are singularly perturbed from the mathematical point of view and because of this, they are poorly amenable to theoretical (computational) analysis. The algorithms allowing surmounting these difficulties are proposed.The software for study of these phenomena is elaborated.In the stages of design of an elongated curvilinear bore-hole with complicated 3D geometry and technological regimes of their drivage, the elaborated software permits one to construct its trajectory securing the smallest values of resistance forces and to choose the least energy-consuming and safe regimes of drilling. It ensures also the possibility to determine the requirements for the necessary accuracy of the bore-hole drivage and for the acceptable geometrical distortions and imperfections.In the stage of the bore-hole drivage, the created software permits to calculate forces and moments of resistance forces with allowance made for the real geometry of the bore-hole and admitted distortion of its axial line. It is possible to prognosticate possible emergency situations and design the measures for their exclusion. At the stage of the emergency situation liquidation, this software allows to simulate the mechanical behavior of the system and its responses to the methods used for elimination of the failure consequences.

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mentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…with respect to s and compare the result with the two first equations of system(10). After some rearrangements, one can gain the expressions for the components of the contact force…”

mentioning

confidence: 99%

See 2 more Smart Citations

Computer Simulation of the Least Energy Consuming and Emergency-Free Regimes of Drilling of Hyper Deep Curvilinear Bore-Holes

2013

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“…(18) to two Eqs (21),. it became possible to specify the majority of the unknown functions through the statement of inverse problems and only the Fx(s) and Mx(s) variables are determined on the basis of direct problem for Eq (21)…”

mentioning

confidence: 99%

Modeling the Energy-Saving Regimes of Curvilinear Bore-Hole Drivage

Gulyayev

Gaidaichuk

Andrusenko

et al. 2014

Journal of Offshore Mechanics and Arctic Engineering

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This paper deals with simulating the energy-saving regimes of drilling deep curvilinear bore-holes with prescribed geometrical imperfections of their axial lines. On the basis of the theory o f curvilinear flexible elastic rods, the 3D "stiff-string" drag and torque model of the drill string (DS) bending is elaborated. With its use, it is shown that the contact and friction forces generated by interaction of the DS with the bore-hole surface can be regulated through the combination of its axial and rotary movements. The advanced is applicable for monitoring the ascending-descending operations, drilling, and well completion.

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Numerical Modeling of the Elastic Bending of a Drillstring in a Curved Superdeep Borehole

2014

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Sensitivity of resistance forces to localized geometrical imperfections in movement of drill strings in inclined bore-holes

Cited by 14 publications

References 6 publications

Computer Simulation of the Least Energy Consuming and Emergency-Free Regimes of Drilling of Hyper Deep Curvilinear Bore-Holes

Computer Simulation of the Least Energy Consuming and Emergency-Free Regimes of Drilling of Hyper Deep Curvilinear Bore-Holes

Modeling the Energy-Saving Regimes of Curvilinear Bore-Hole Drivage

Numerical Modeling of the Elastic Bending of a Drillstring in a Curved Superdeep Borehole

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