Stick–Slip Characteristics of Drill Strings and the Related Drilling Parameters Optimization

Wang, Chao; Chen, Wenbo; Wu, Zhe; Li, Jun; Liu, Gonghui

doi:10.3390/pr11092783

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…The research results provide recommendations for assessing the risk of wellbore instability and are in good agreement with the obtained model dependences of friction and contact forces. Article [81] proposes a model for reducing the friction between the drill string and the wellbore, as well as for increasing the efficiency of axial load transfer and increasing the penetration speed for the directed section of the well. The data are positively correlated with the values of the coefficient of friction of the drill pipes to the wellbore from the three main rocks.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…In order to increase the service life of drilling equipment and avoid emergency downtime due to unexpected breakdowns, companies that design and manufacture drilling equipment pay considerable attention to the optimal design of friction nodes [8,9], protection of working surfaces of critical structural elements [10,11], stable lubrication bearing supports [12,13], careful balancing of rotating parts and assemblies [14,15], vibration protection of the drilling tool [16][17][18][19], research into the interaction of the drilling tool with the rock for the development of effective technological modes of drilling and arranging wells [20][21][22][23], repair work in the well and improving maintenance resources [24], etc.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Mandziy,

Ivasenko,

Berehulyak

et al. 2024

Lubricants

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The improvement of drilling rig systems to ensure a reduction in unproductive time spent on lowering and lifting operations for replacing drilling tools and restoring the performance of drilling equipment units is an important task. At the same time, considerable attention is paid to the reliable and efficient operation of the braking systems of drilling rig winches. In the process of operation, the polymer pads periodically come into contact with the outer cylindrical surface of the metal pulley during braking, work in extreme conditions and wear out intensively, so they need periodic replacement. Tests were carried out on a modernized stand and in industrial conditions for the brakes of drilling winches. A methodology for evaluating the degradation of the brake pad friction surface during its operation is proposed. The assessment of the degradation degree is carried out based on the image of the brake pad surface using image processing techniques. Geometric transformations of the input image were performed to avoid perspective distortions caused by the concave shape of the brake pads and the spatial angle at which the image is acquired to avoid glares. The crack detection step was implemented based on the scale-space theory, followed by contour detection and skeletonization. The ratios of the area and perimeter of segmented and skeletonized cracks to the total area were chosen as integral characteristics of the degradation degree. With the help of scanning electron microscopy, the character of the destruction of the friction surface and the degradation of the polymer material was investigated. Experimental studies were performed, and the application of the proposed method is illustrated.

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Recognition of drill string vibration state based on WGAN-div and CNN-IWPSO-SVM

Qu,

Liao,

et al. 2024

Geoenergy Science and Engineering

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Stick–Slip Characteristics of Drill Strings and the Related Drilling Parameters Optimization

Cited by 4 publications

References 26 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

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Recognition of drill string vibration state based on WGAN-div and CNN-IWPSO-SVM

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