Lateral vibration analysis of pre-bent pendulum bottom hole assembly used in air drilling

Zhang, He; Di, Qinfeng; Wang, Wenchang; Chen, Feng; Chen, Wei

doi:10.1177/1077546317747778

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…The effect of ERBD on bit side force is discussed in light of numerical computation for Eqs. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). When 𝑃 = 20 kN, the deviation force of BHA is shown in Fig.…”

Section: Fig 3 Expansion Ratio Of Borehole Diameter By Air Drillingmentioning

confidence: 99%

“…Besides, the weighted margin method is given to analyze the three-dimensional mechanical characteristics of BHA with small deflection. Zhang and Di et al [15] applied the weighted margin method to determine the upper tangent point through a nonlinear static model of BHA. The methods above are applied widely to explore the mechanical properties of BHA in mud drilling, which may provide research ideas and schemes for exploring the mechanism of well deviation in the air drilling.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical characterization of bottom hole assembly in air drilling engineering

Han¹,

Tang²,

Zhang³

et al. 2023

Math. models, eng.

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To study the mechanism and control of well deviation in air drilling, a mechanical model of bottom hole assembly (BHA) with double stabilizer is established by using the beam-column method. The mathematical model related to side force of BHA and deviating force of strata are derived by analyzing the characteristics of gravel strata in the practical engineering. The effects of weight on bit (WOB), expansion ratio of borehole diameter (ERBD), angle of well inclination, diameter of drill collar and strata bending moment on side force of BHA are explored. Then, the superposition of bit side force and deviating force of strata is obtained. The results display that side force of BHA is obviously influenced by ERBD, angle of well inclination, diameter of drill collar and strata bending moment; and the deviation force and azimuth force of gravel strata are significantly affected by comprehensive cutting anisotropy index, angle of well inclination and dip angle of strata. Finally, the variation tendency of inclination angle and azimuth angle in field measurement is consistent with the theoretical and numerical researches. The present work can provide theoretical guidance to control the well deviation in the practical air drilling.

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Section: Fig 3 Expansion Ratio Of Borehole Diameter By Air Drillingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of bottom hole assembly in air drilling engineering

Han¹,

Tang²,

Zhang³

et al. 2023

Math. models, eng.

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“…In the following year, the dynamics model of BHA with prebent joint was established with Lagrange equation by Di et al, [13][14][15][16] who considered the friction between BHA and borehole wall, as well as the interaction between bit and formation in; the results show that the structural parameters of BHA and the mechanical parameters of the system have a great influence on the lateral vibration of BHA. After the structural particularity of BHA with prebent joints was analyzed, Zhang et al 17,18 proposed a method for quickly solving the transverse response of BHA based on the previously established dynamic model. Subsequently, Di and Wang et al [19][20][21] derived the dynamic lateral forces on bit by using the force and moment balance theory.…”

Section: Introductionmentioning

confidence: 99%

Study on lateral vibration characteristics of BHA with double-span drill collar

Tao,

Meng,

Huang

et al. 2024

Advances in Mechanical Engineering

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The severe vibration of BHA directly affect the drilling efficiency, borehole trajectory, and wellbore quality. Therefore, it is crucial for developing dynamic mechanics of drill string system by studying the mechanical behavior of BHA. In this paper, considering the continuity condition of double-span drill collar, the expression of lateral vibration of drill collars is firstly obtained by using the assumption mode method. Then, the lateral vibration equation of double-span drill collar is derived by Lagrange equation. Finally, a self-programming model is established based on dynamic mechanics of drill string system, the lateral vibration characteristics of double-span drill collar in four different types of BHA is further determined by the fourth-order Runge-Kutta algorithm. It is obviously found that the lateral vibration is enhanced with increasing the length of drill collar; the rotation speed of BHA, weight on bit (WOB), and the size of stabilizer have a significant influence on the lateral vibration of drill collar. In the practical application, the lengths of the first-span and the second-span drill collar are given as 10 and 19 m, respectively; and the stabilizer diameter approached to bit diameter is recommend in practical gas drilling engineering; under WOB of 10–40 kN, the rotation speed of the drilling string should be controlled nearby 60 r/min. The theoretical investigation is a guidance for structure design of BHA and optimization of drilling parameter.

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“…In the process of drilling, bottom hole assembly (BHA) often encounters serious vibration problems, which will affect the rock-breaking effect, reduce the drilling efficiency, and even lead to drilling tool failure and downhole accidents [1][2][3]. The vibration information of BHA is very complex, which includes the vibration of drilling tools themselves, the vibration excited by the interaction between BHA and the formation, and the vibration caused by the collision between BHA and the borehole wall.…”

Section: Introductionmentioning

confidence: 99%

A High-Frequency Measurement Method of Downhole Vibration Signal Based on Compressed Sensing Technology and Its Application in Drilling Tool Failure Analysis

Lyu,

Wang,

Mei

et al. 2023

IEEE Access

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The high-frequency information of downhole vibration can record more specific details about the dynamic response of bottom hole assembly (BHA), which is conducive to analyzing downhole abnormal vibration and diagnosing drilling tool failure. However, high frequency measurements would generate a large amount of data, which is a huge challenge for data storage. To cope with this challenge, this work proposes applying compressive sensing theory to high-frequency measurement of downhole vibration signals and failure analysis of drilling tools. First, three ADCs clocked at different sub-Nyquist frequencies are used to collect and store downhole vibration signals. Then, the stored sparse vibration data is reconstructed into complete vibration signal by an improved OMP signal reconstruction algorithm. The performance of the proposed method has been investigated via a series of experiments by applying simulation and real vibration signals, which show that the proposed method can reconstruct the downhole vibration signal well and significantly reduce the pressure of acquisition and data storage. This method provides a new way to obtain the high-frequency measurement data of downhole vibration, and provides a data basis for further mastering the comprehensive law of downhole vibration, diagnosing abnormal downhole vibration, and drilling tool failure.INDEX TERMS Downhole vibration measurement, Compressed sensing, Drilling tool failure.

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Lateral vibration analysis of pre-bent pendulum bottom hole assembly used in air drilling

Cited by 8 publications

References 22 publications

Mechanical characterization of bottom hole assembly in air drilling engineering

Mechanical characterization of bottom hole assembly in air drilling engineering

Study on lateral vibration characteristics of BHA with double-span drill collar

A High-Frequency Measurement Method of Downhole Vibration Signal Based on Compressed Sensing Technology and Its Application in Drilling Tool Failure Analysis

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