Multi-Objective Optimization of Drilling Trajectory Considering Buckling Risk

Jeong, Jin-Yong; Lim, Chaeog; Park, Byeong-Cheol; Bae, Ji‐Hoon; Shin, Sung‐Chul

doi:10.3390/app12041829

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…For this type of drilling, the well axis is a spatial curve; therefore, the drill string is a complex system with distributed parameters. Depending on the external loads and the "drill string-well bore" contact interaction conditions, sections of the drill string have a spiral shape, with local losses of stability, which perform various kinds of oscillations [4][5][6][7][8]. At the same time, the drill string is exposed to frictional and contact forces, inertial forces of the washing fluid, etc.…”

Section: Introductionmentioning

confidence: 99%

An Analytical–Numerical Model for Determining “Drill String–Wellbore” Frictional Interaction Forces

Bembenek,

Grydzhuk,

Gajdzik

et al. 2024

Energies

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Currently, drilling of directional oil and gas wells under complex technical-technological and mining-geological conditions requires the use of drill pipes made of various materials. In turn, to choose rational modes of strengthening drill pipes and drill string layouts, information on the contact forces and friction forces of the drill string pipes on boreholes is necessary. Drill pipe curved sections friction with boreholes and drill bit resistance moment changes are the main causes of uneven rotation of a drill string during rotary or combined drilling methods and the occurrence of parametric oscillations. To reduce the cost of mechanical energy for well wiring, it is necessary to take into account the “drill string–borehole rocks” force interaction to estimate the magnitude of the frictional forces and their influence on the technological parameters of the drilling process. To solve this problem, mathematical models of “conventionally vertical and inclined drill string sections–borehole” were built. Based on the industrial data, an analysis of the force interaction of a deformed drill string composed of pipes made of different materials (aluminum, titanium, steel) was carried out. Analytical dependences were obtained for determining the contact forces and friction of the pipes on boreholes. A numerical study of the change of these power factors depending on the depth of the well under conditions of intensive vibration loading was carried out. The amplitude values of these forces, the frequency of their change for good sections, as well as the places for the most rational installation of drill pipes in the layout of the drill string were estimated. It was established that the intensity of contact and friction forces for steel drill pipes is greater than for titanium or aluminum ones. It is shown that the greater impact of a solid steel string on contact forces and frictional forces compared to a layout with sections of titanium or aluminum pipes in the range of vibration frequencies of 8–22 Hz corresponds to a bit rotation frequency of 70–80 rpm. The practical application of the obtained research results will contribute to the improvement of technical and economic indicators of the well drilling process.

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Section: Introductionmentioning

confidence: 99%

An Analytical–Numerical Model for Determining “Drill String–Wellbore” Frictional Interaction Forces

Bembenek,

Grydzhuk,

Gajdzik

et al. 2024

Energies

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“…The axial load applied to the entire area of contact with the drilling tool must exceed the strength of the rock and break it down. However, it is known that in directional wells, and especially in wells with complex profiles and large deviations from the vertical, the axial load applied to the bit does not reach the bottom hole in full [14,21]. This is due to the complex stress-strain state of the drilling tool in cramped downhole conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Longitudinal loss of stability of the drilling tool contributes to the occurrence of lapels and fractures of the drilling tool. In drilling practice, engineers try to avoid situations in which the DS loses its stability and takes any form of buckling [14,[21][22][23]. However, the positive effects of artificially created and controlled buckling of the DS on the destruction of mud plugs and cleaning the well from cuttings are proposed in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…The above studies confirmed the presence of critical zenith angles of the well trajectory, described the effect of the rotation speed of the drilling rig, volumetric flow, technological and mud rheological properties on the quality of wellbore cleaning of cuttings. However, the effect of DS buckling on the destruction of mud plugs and mud carryover has not been addressed in any of the above works, due to the fact that engineers are trying to predict and exclude the buckling phenomenon [21,[31][32][33], and the positive effect of controlled DS buckling on well cleaning has hardly been considered.…”

Section: Introductionmentioning

confidence: 99%

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Development of Technology for Hydromechanical Breakdown of Mud Plugs and Improvement of Well Cleaning by Controlled Buckling of the Drill String

Kadochnikov

Dvoynikov

2022

Applied Sciences

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The article provides brief information about a non-standard experimental setup developed in the laboratory of the St. Petersburg Mining University Well Drilling Department. The developed technique presented makes it possible to simulate well cleaning process of cuttings by incorporating the variation of the parameters (the zenith angle of the well, the volume flow and rheological properties of the cleaning agent, the rotation frequency, the number and length of the drill string half-waves) that cause buckling. For the first time, the positive side of the drill string (DS) buckling phenomenon is considered. A positive hydro-mechanical effect on mud plugs and improved well cleaning were revealed. The results of the experimental study confirm an intense difficulty in transporting cuttings to the surface at a critical zenith angle of the well of 55°. Regularities have been established making it possible to determine the effect of DS buckling on the cutting-carrying capacity when drilling deviated and extended reach wells. It is proposed to use hydromechanical impact on the accumulated cuttings by artificially controlling the resulting DS buckling in order to destroy the mud plug and increase the efficiency of well cleaning without the use of specialized devices. A conceptual solution aimed at implementing a method for hydromechanical destruction of mud plugs—the use of drill pipes equipped with a quasi-distributed differential measuring system of strain gauges based on a fiber-optic Bragg grating—is presented.

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Selection of Optimal Well Trajectory Using Multi-Objective Genetic Algorithm and TOPSIS Method

Yavari,

Qajar,

Aadnoy

et al. 2023

Arab J Sci Eng

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This study presents a novel approach for optimizing well paths in extended reach drilling (ERD) wells. Different trajectories can be used for ERD wells, each with its pros and cons. Previous research overlooked certain objective functions in single-objective optimization and lacked an autonomous method for selecting the best solution from Pareto optimal solutions in multi-objective optimizations. Furthermore, they lacked comparing different profiles in well design. Risk assessment and operational factors, which greatly influence optimization and drilling success, were insufficiently considered. This study utilized the multi-objective genetic algorithm (MOGA) and the technique for order preference by similarity to an ideal solution (TOPSIS) method to select the optimal well path based on torque, wellbore length, risk (e.g., keyseat), and required tools. First, all possible trajectories were determined, and MOGA identified the optimal path with minimal torque and length. The fuzzy decision-making method automatically selected the best solution from the Pareto optimal solution set. The associated risks and required tools are evaluated for each trajectory. Finally, the TOPSIS method selected the optimal trajectory based on torque, length, risks, and required tools. The case study demonstrated that the undersection path was the most advantageous trajectory for ERD wells, with a 60% closeness to the ideal state. The multiple build trajectory achieved 57% closeness, while the build and hold and double build paths had lower closeness values (43 and 28%, respectively). Consequently, it can be inferred that in the context of ERD wells, it is preferable to carry out the deviation process at deeper depths.

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Multi-Objective Optimization of Drilling Trajectory Considering Buckling Risk

Cited by 6 publications

References 13 publications

An Analytical–Numerical Model for Determining “Drill String–Wellbore” Frictional Interaction Forces

An Analytical–Numerical Model for Determining “Drill String–Wellbore” Frictional Interaction Forces

Development of Technology for Hydromechanical Breakdown of Mud Plugs and Improvement of Well Cleaning by Controlled Buckling of the Drill String

Selection of Optimal Well Trajectory Using Multi-Objective Genetic Algorithm and TOPSIS Method

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