The Effects of Drilling Mud and Weight Bit on Stability and Vibration of a Drill String

Jafari, Ali; Kazemi, Reza; Mahyari, Mohammad Faraji

doi:10.1115/1.4005033

Cited by 13 publications

(12 citation statements)

References 21 publications

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“…2a). Both of these elements are hollow steel cylinders with a cumulative length of up to 5 km (depending on the size and trajectory of the well) and of the drill collars up to 300 m long (Jafari et al 2012). These collars comprise approximately 10 m long components tied with threaded connections.…”

Section: Causes Of Drillstring Vibrationmentioning

confidence: 99%

“…Typically, the drill collar is thicker than the drill pipe to prevent buckling. (Jafari et al 2012). Drill string failure data for wells (b) in Italy and (c) in Africa (Dykstra 1996).…”

Section: Causes Of Drillstring Vibrationmentioning

confidence: 99%

“…Various researchers have tried to quantify the effect of different drilling parameters on the intensity and severity of drillstring vibrations in wellbores (Jafari et al 2012;Liao et al 2012;Ma et al 2022). In this line, several drilling parameters such as WOB, RPM, and mud and formation properties such as friction, formation strength and natural fractures play significant roles.…”

Section: Parameters Controlling Drillstring Vibrationmentioning

confidence: 99%

“…The point where the tensile axial force changes into compression is known as the neutral point. The neutral point is the point where compressive stress is equal to local buoyancy (Jafari et al 2012). The conventional calculation of the height of the neutral point is based on static forces only and considers the contribution from buoyancy and static drillbit weight.…”

Section: Parameters Controlling Drillstring Vibrationmentioning

confidence: 99%

See 3 more Smart Citations

Minimizing Drill-String-Induced Wellbore Instability

Das

AlBahrani

Bathija

et al. 2023

Middle East Oil, Gas and Geosciences Show

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Objective/Scope Every year the petroleum industry spends more than an estimated $6 billion in mitigating wellbore instabilities that account for nearly half of the drilling-related NPT (non-productive time). Researchers believe wellbore instability problems occur primarily due to physical and chemical interactions between rocks and drilling fluid and mostly neglect the impact of drill string vibrations on wellbore stability. However, such vibrations can cause significant damage to the formation, which then degrades the formation's mechanical integrity and compound wellbore instabilities. An appreciable body of evidence exists documenting that higher RPM (revolutions per minute), higher WOB (weight on bit), and pendulum BHA (bottom hole assembly) can cause enhanced agitation of the wellbore wall rock which may result in formation damage – often accompanied with an increased ROP (rate of penetration). The primary objective of this work is to review the state of modelling vibrations as documented in the literature and then advance the development and impact of vibrations and rock failure due to the aforementioned drilling parameters using numerical methods. Methods, Procedures, Process The proposed research will analyze the complex dynamic interaction between drill-string and borehole using a commercially available finite element package (e.g., COMSOL or ABAQUS etc.). These packages have the capability to create multiphysics-based models and simulate engineering and industry applications. A drill-string borehole assembly will be modelled with geometric and associated environmental and material boundary conditions (e.g., stress state, pore-fluid pressure, mud pressure etc.). The results will then be calibrated with experimental and field data. Results, Observations, Conclusions Subsurface drilling parameters are often undetermined or not measurable during drilling. The proposed model will aim at developing a drill-string-dynamics model to simulate the interactions between the wellbore and the drill string. This includes (i) estimation of drill string vibrations for different drill string and BHA designs, (ii) the resulting impact forces from drill string vibrations for different wellbore designs, and (iii) the influence of the estimated impact forces on the wellbore wall of particular (chosen) rock types at its current stress or yielding state. Novel/Additive information The research project proposed herein will equip the well-planning engineers with advanced and robust tools to predict and mitigate wellbore instabilities resulting from drill-string vibrations. We develop new models that incorporate the dynamics mentioned above in order to evaluate quantitatively the effects of drill string vibrations on wellbore instabilities. We anticipate contributions along the following themes:

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Section: Causes Of Drillstring Vibrationmentioning

confidence: 99%

“…Typically, the drill collar is thicker than the drill pipe to prevent buckling. (Jafari et al 2012). Drill string failure data for wells (b) in Italy and (c) in Africa (Dykstra 1996).…”

Section: Causes Of Drillstring Vibrationmentioning

confidence: 99%

Section: Parameters Controlling Drillstring Vibrationmentioning

confidence: 99%

Section: Parameters Controlling Drillstring Vibrationmentioning

confidence: 99%

See 2 more Smart Citations

Minimizing Drill-String-Induced Wellbore Instability

Das

AlBahrani

Bathija

et al. 2023

Middle East Oil, Gas and Geosciences Show

View full text Add to dashboard Cite

show abstract

“…The bottom part is made up of a weightier pipe called the BHA. The drill bit is surrounded by drilling mud, which dissipates the energy of the drill bit and the strong torque imposed on the bit [40]. The drill bit is also subjected to a friction torque T f b that represents the bit-rock interaction.…”

Section: Dynamic Modeling Of Drill String Systemmentioning

confidence: 99%