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Deep vertical wells drillstring idling power and theoretical study of the buckling

Author: ChenMin
Tutor: LvJianGuo
School: Chinese Geology University (Beijing)
Course: Geological Engineering
Keywords: Deep vertical wells Drillstring Idling power Drillstring buckling
CLC: P634.5
Type: Master's thesis
Year: 2005
Downloads: 204
Quote: 2
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Abstract


In this paper, solid mechanics, fluid mechanics, mathematics knowledge, learn from the results of previous studies based on the establishment of the idle power of the drill string, drilling the broken rock power consumption and a mathematical model of the drillstring buckling. Deep vertical wells rotary drill column idle power consumption factor analysis, considering the idling action of centrifugal force on the borehole wall due to the friction resulting from the power consumption, and the drilling fluid as a Newtonian liquid, the use of a cylindrical coordinate system to establish a rotating drillstring idling power consumption analysis of in Sham Tseng operating under the conditions of the model. Considering idling power and drillstring rotation angular velocity, the relationship between the structural parameters of the drill string and the borehole, drilling fluid viscosity coefficient and other factors, namely the rotary drillstring movement during the centrifugal force and the drilling fluid in the drill string a shear stress power, more in line with the actual conditions of the mathematical model. The drill string during drilling, when the drill string in the wellbore by the load exceeds a certain value, from the initial linear state into a curved state, and this is the instability of the drillstring. The basic instability of the external constrained by borehole drill string configuration including a sinusoidal flexion and helical buckling. The drill string in the well when working, to a certain speed for rotary drilling movement. When the axial force is small, the drill string is bent sinusoidal shape. When the axial force is increased, the drill string is bent into a spiral shape. In this paper, considering the centrifugal force and gravity of the drillstring buckling, the use of the energy method to study the relationship between the drillstring speed sinusoidal buckling and helical buckling critical axial force, and then get the speed - axial mathematical model of the critical force. According to the principles of the energy method, by considering the bending deformation of the drill string, and is equal to the work done by the power and the centrifugal force of gravity do the mathematical relationship between the expression derived speed - axial critical force. The model considers the centrifugal force of inertia of the drill string and the self-respecting, analysis showed that in working condition, the critical pressure of the drill string will be significantly less than the static critical force has a very important guiding significance for the actual drilling engineering . Determine consumption at home and abroad now use the drill broken rock power relationship is the empirical formula obtained through experimental study. The model does not fully reflect the quantitative relationship between determine the parameters of the power. Values ??contained in the formula, and many difficult considerations. Therefore, according to the value of the power consumption of the bottom of the hole and its model, can only be regarded as an approximation. In this paper, considering the deep vertical wells cone bit, the rock anisotropy cone bit quiet WOB, the moving impact loading broken rock power, considering the impact of the power consumed by the friction between the bit and rock debris, more suitable for deep vertical well drilling broken rock power model theory. From this model shows that: to select WOB, speed and cone structure can effectively improve the power of the crushed rock.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Drilling Project > Drilling technology and methods
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