Abstract
Bit bounce and stick-slip vibration are detrimental to the service life of drillstring and down-hole equipment. A two degrees-of-freedom lumped parameters model is employed to account for bit-rock interaction and coupled vibration. Qualitative analysis to system parameters is performed through analyzing the influence of the angular speed of the rotary table and the length of drillstring on stick-slip vibration and bit bounce. After that, the suppression methods of stick-slip vibration and bit bounce are also given. The nonlinear motions predicted by the model are in agreement with the experimental observations. The study shows that increasing the weight-on-bit(WOB) and the angular speed of the rotary table effectively suppresses bit bounce and stick-slip vibration. What’s more, the posterior models can suppress stick-slip vibration. At the same time, bit bounce can be reduced through applying the models in the middle. When the drillstring is in a higher-length, the stick-slip frequency is at a lower level. However, the intensity of bit bounce is extremely high.
Highlights
Drilling is an essential component of exploration and exploitation of oil and gas reservoirs in petroleum engineering
The stick-slip vibration appears near the line / = 0, and there is a periodic trend in the difference which is between the angular displacement of bit and rotary table
Numerical simulations and experiments showed that the frequency of stick-slip and the intensity of bit bounce have a downward trend simultaneously with the development of the angular speed of the rotary table and WOB
Summary
Drilling is an essential component of exploration and exploitation of oil and gas reservoirs in petroleum engineering. Resisting torque is an intrinsic property taking place at the bit-rock interface It must be taken into consideration in stick-slip vibration [6]. A common friction model including a local velocity-weakening effect and Coulomb friction is proposed It is based on experimental results and shows a decrease in bit torque with rotational speed increasing [8,9,10]. MODELING AND ANALYSIS OF STICK-SLIP VIBRATION AND BIT BOUNCE IN DRILLSTRINGS. The length of the drillstring and the rotational speed of the rotary table were analyzed qualitatively through applying the two degrees-of-freedom lumped parameters model.
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