Relevant bibliographies by topics / Multi-hole seals

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Multi-hole seals'

Author: Grafiati
Published: 28 May 2022
Last updated: 30 July 2025

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Journal articles on the topic "Multi-hole seals"

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Sun, Dan, Sheng-Yuan Li, Huan Zhao, and Cheng-Wei Fei. "Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals." Materials 12, no. 14 (2019): 2324. http://dx.doi.org/10.3390/ma12142324.

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To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance,
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Wu, Haojun, Min Gong, Xiaodong Wu, and Yang Guo. "Effect and Response of Coal and Rock Media Conditions on Deep-Hole Pre-Splitting Blasting Techniques for Gas Drainage." Energies 15, no. 22 (2022): 8733. http://dx.doi.org/10.3390/en15228733.

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Different types of deep-hole blasting techniques are needed to solve gas drainage problems in complex and variable cases. Blasting parameters suitable for mines are selected based on the relationship between blast stress field changes and gas flow combined with field application and numerical simulation. The Datong Mine was a background to study the blast crush zone and drainage influence range following deep-hole blasting with holes laid in coal seams, which resulted in a 24% increase in gas flow in the drainage hole 6 m from the blast hole. In response to the difficulty of forming blast hole
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Saveleva, N., S. Shed, and Y. Savelev. "Improving the quality of core sampling from methane coal seams." E3S Web of Conferences 376 (2023): 01063. http://dx.doi.org/10.1051/e3sconf/202337601063.

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In the article, the authors talk about ways to improve the quality of core sampling from methane coal seams in the Kuznetsk coal basin. Core sampling is carried out at the exploration wells of Naryksko-Ostashinskaya square. Methane extraction is carried out to remove gas from coal seams. Moreover, gas can be used as unconventional energy sources. Thus, safety at coal mining facilities increases, and we receive additional income for the sale of gas to end consumers. To develop a technology for extracting gas from coal seams, core sampling is carried out, and the results obtained are analyzed. F
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Ding, Lipei, Yuning Sun, Zhiming Wang, Weibin Song, and Yonglong Wang. "Parameter Optimization of Drilling Cuttings Entering into Sieve Holes on a Surface Multi-Hole (SMH) Drill Pipe." Energies 15, no. 10 (2022): 3763. http://dx.doi.org/10.3390/en15103763.

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The borehole drilling distance is short in soft and gas outburst-prone coal seams because of drill pipe jamming induced by cuttings accumulating in the borehole, hindering coal mine gas hazard prevention and utilization. A surface multi-hole (SMH) drill pipe composed of a bearing layer, fluid layer, and anti-sparking layer was proposed preliminarily, where several sieve holes were also set. To study the process of drilling cuttings in boreholes entering into the inner hole of an SMH drill pipe and its influencing factors, mechanical model analysis, CFD-DEM simulation, and a physical experiment
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Yan, Jin, Kejiang Lei, Yuangang Jiang, Minbo Zhang, Weizhong Zhang, and Hao Yin. "Optimization of Accurate Spacing for Gas Extraction from Damaged Coal Seams Based on a Dual-Penetration Model." Sustainability 15, no. 21 (2023): 15339. http://dx.doi.org/10.3390/su152115339.

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In order to develop precise hole placement technology for gas extraction, this paper combines industrial testing, the evolution law of coal rock damage permeability, and the coal double-pore double-permeability model; establishes a coupling model of the coal damage deformation field and matrix-fracture double diffusion seepage field; and determines precise hole placement spacing for a coal seam gas by using the COMSOL Multiphysics 5.6 numerical simulation software. This study shows that the effective radius of gas extraction is 4.8 m after 180 d of extraction, which is a power function of the
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Lin, Xiaolu, Zhen Liu, Ning Geng, Peng Hu, and Qingbo Gu. "Optimization and Application of Water Injection Process in Gas-Bearing Coal Seam." Processes 11, no. 10 (2023): 3003. http://dx.doi.org/10.3390/pr11103003.

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Coal seam pre-drainage technology is widely used to prevent and control gas in China’s high-gas coal seams, and upward drilling is a safe and reliable technology. Using the Luling Coal Mine as the study location, according to the actual situation of the site, a layer-through drilling process was proposed. Relying on a cross-layer extraction borehole, coal seam water injection efficiency extraction and high-efficiency water injection dust prevention can be performed in the later stage of borehole extraction, enabling one-hole multi-purpose and “gas-powder” integrated prevention and control. In
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Sergeeva, M. S., and R. A. Kravchenko. "OBJECTS FROM THE TREATED BONE FROM THE SETTLEMENT OF RADYCHIVSKE 3 ON THE DESNA RIVER BASIN (ACCORDING TO THE EXCAVATIONS 1991—1992)." Archaeology and Early History of Ukraine 38, no. 1 (2021): 425–37. http://dx.doi.org/10.37445/adiu.2021.01.30.

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The bone objects from the multi-layered settlement Radychivske 3 (Korop district, Chernihiv region) are introduced into scientific circulation and analyzed in the paper. They have been found during the excavations in 1991—1992. The items come from objects of Romny culture (structures and pits) and from the cultural layer.
 Most of the finds are pointed tools. Thirteen of them can be interpreted as tools for treating of seams or for weaving and 2 are piercing tools. The collection also contains two horse bones with a natural sharpening with no traces of use. Their interpretation as tools i
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KARAZEY, VITALIY, KATERYNA SOKOLAN, ANDRIY KUSHNIRCHUK, and OLEKSIY KALININ. "MODERNIZATION OF THE TURNING TABLE FOR NC MACHINE TOOL." Herald of Khmelnytskyi National University 303, no. 6 (2021): 142–46. http://dx.doi.org/10.31891/2307-5732-2021-303-6-142-146.

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The article envisages the increase in the efficiency of NC machine tool due to the use of an upgrades design of turning table for installation and fixing of workpieces, the use of which will lead to improved productivity of machining. With the help of a turning table it is possible to perform machining of workpieces of different shapes from several sides without resetting, and to rotate the workpiece in different coordinates to carry out other technological transitions. Such tables are widely used un multi-position hole machining, milling planes on drilling and milling machines. The workpiece
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Fang, Zhi, Zhigang Li, and Jun Li. "NUMERICAL INVESTIGATIONS ON STATIC AND ROTORDYNAMIC CHARACTERISTICS FOR TWO TYPES OF LIQUID HOLE-PATTERN SEALS WITH TILTED CAVITIES." Journal of Vibration and Acoustics, April 12, 2022, 1–16. http://dx.doi.org/10.1115/1.4054323.

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Abstract Two types of liquid hole-pattern seals with axially-oblique (A-HPS) or circumferentially-oblique (C-HPS) hole cavities are designed. To evaluate the leakage and rotordynamic characteristics of the liquid hole-pattern seals, a 3D transient perturbation method is employed, which based on the multi-frequency one-dimensional rotor whirling model and the mesh deformation technique. The accuracy and reliability of the proposed numerical approach is demonstrated based on the published experimental data of the leakage and rotordynamic force coefficients for a hole-pattern seal (HPS). Seal lea
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Wang, Tianhao, Zhigang Li, and Jun Li. "A Wide-Bandwidth And High-Resolution Identification Method For The Dynamic Characteristics Of Annular Gas Seals Using Hilbert Transform." Journal of Engineering for Gas Turbines and Power, September 28, 2024, 1–26. http://dx.doi.org/10.1115/1.4066718.

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Abstract This paper proposed a Hilbert-transform-based time-frequency analysis method to identify the dynamic characteristics of annular gas seals. The frequency-sweep whirling orbit model (FSM) was adopted as the excitation signal of rotor whirling motion. The transient flow field within the seal clearance was numerically simulated by the computational fluid dynamic (CFD) solution combined with the mesh deformation technique. The empirical amplitude-modulated (AM) and frequency-modulated (FM) decomposition and the direct quadrature method were utilized to approximate the analytic signals of t
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Dissertations / Theses on the topic "Multi-hole seals"

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Слинько, Д. Ю. "Числовий аналіз впливу багатошпаринних ущільнень на динаміку ротора відцентрового насосу". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82125.

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В роботі розглянуті витратні та статиччні характеристики шпаринних дроселів для турбулентної течії в’язкої нестискуваної рідини. Так як ущільнення є деяким резервом підвищення ККД, то дослідження якісного впливу їх окремих параметрів на величину і напрямки гідростатичної сили має практичне значення. Для цього у роботі обчислено зміни тиску по довжині каналу і радіальну силу, зміни перепадів тиску по колу, обчисленні витрати при великих торцевих камерах, коефіцієнти жорсткості.
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Conference papers on the topic "Multi-hole seals"

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Fang, Zhi, Zhigang Li, Jun Li, and Zhenping Feng. "Static and Rotordynamic Characteristics for Two Novel Hole-Pattern Annular Liquid Seals With Circumferentially- /Axially- Oblique Hole Cavities." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-58996.

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Abstract Non-contacting annular damper seals, such as hole-pattern seals are gradually used in the multiple-stage centrifugal pumps, as a replacement of the conventional labyrinth seal to reduce the fluid leakage and stabilize the rotor-bearing system.The hole-pattern seal (HPS) possesses numerous radial hole cavities on the seal stator, and the geometric constructions of the hole cavity (such as the hole depth and diameter) have been demonstrated to have significant influences on the leakage and rotordynamic characteristic for hole-pattern seals. Due to the inevitable manufacturing variabilit
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Fang, Zhi, Zhigang Li, Jun Li, and Zhenping Feng. "Numerical Investigation on the Static and Rotordynamic Characteristics for Two Types of Novel Mixed Helical Groove Seals." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16303.

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Abstract Non-contracting annular seals, such as helical groove seals, are widely used between the impeller stages in the liquid turbomachinery to reduce the fluid leakage and stabilize the rotor-bearing system. However, previous literature has expounded that the helical groove seals possess the poor sealing property at low rotational speed condition and face the rotor instability problem inducing by negative stiffness and damping, which is undesirable for liquid turbomachinery. In this paper, to obtain the high sealing performance and the reliable rotordynamic capability for full operational c
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Fang, Zhi, Zhigang Li, Jun Li, and Zhenping Feng. "Numerical Investigations on the Static and Rotordynamic Characteristics of Hole-Pattern Seals With Annular or Pocket Grooves on Seal Stator." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90776.

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Abstract Annular damper seals, such as hole-pattern seals, are widely used to control leakage and enhance rotordynamic stability in turbomachinery, especially for the balance-piston seal in the straight-through compressor, and the center seal in the back-to-back compressor. To avoid or minimize negative static stiffness, annular grooves on seal stator have been used to increase direct static stiffness of hole-pattern seals by dividing one long seal to several shorter seal sections. However, few literatures are available for understanding the influences of annular grooves on seal static and rot
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4

Thorat, Manish R., and James R. Hardin. "Rotordynamic Characteristics Prediction for Hole-Pattern Seals Using CFD." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90846.

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Abstract The experimental set-up for a hole-pattern seal is modeled using CFD and results compared with measured test data and bulk flow model (ISOTSEAL) predictions. The inlet swirl boundary condition for prior CFD analyses of this test case have either been assumed or based on pitot-tube measurements. In this paper, the validity of each is investigated by including radial inlet nozzles with the inlet plenum in the model geometry. A transient mesh deformation technique with multiple frequency journal excitations is used to determine frequency dependent rotordynamic coefficients. This multi-fr
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Wang, Tianhao, Zhigang Li, and Jun Li. "A Wide-Bandwidth and High-Resolution Identification Method for the Dynamic Characteristics of Annular Gas Seals Using Hilbert Transform." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-126191.

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Abstract Efficient and accurate parameter identification methods are urgently needed to develop high-performance sealing devices. Although the existing prediction methods have been widely validated, researchers are still grappling with the trade-off between frequency resolution and computational cost. This paper proposed a Hilbert-transform-based time-frequency analysis method to identify the dynamic characteristics of annular gas seals. The frequency-sweep whirling orbit model (FSM) was adopted as the excitation signal of rotor whirling motion. The transient flow field within the seal clearan
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Susilo, Yoliandri, Khsitij Dharmadhikari, Sherif Taha, et al. "Multizone Open Hole Gravel Pack Completion with Selective Production Capability in ACG Field." In SPE Caspian Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/217513-ms.

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Abstract Azeri-Chirag-Gunashli (ACG) is a giant field located in the Azerbaijan sector of the Caspian Sea. The major reservoir zones are multi layers sandstone formations and weakly consolidated where Open Hole Gravel Pack (OHGP) completions have become the standard design for production wells. To date more than 170 high rate OHGPs have been completed that are producing comingled from multi-layered sandstone formation. As the field matures, problems such as premature water and gas breakthrough are becoming increasingly common requiring the completion system to be inherently flexible to address
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Susilo, Yoliandri, Khsitij Dharmadhikari, Sherif Taha, et al. "Multizone Open Hole Gravel Pack Completion with Selective Production Capability in ACG Field." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216154-ms.

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Abstract Azeri-Chirag-Gunashli (ACG) is a giant field located in the Azerbaijan sector of the Caspian Sea. The major reservoir zones are multi layers sandstone formations and weakly consolidated where Open Hole Gravel Pack (OHGP) completions have become the standard design for production wells. To date more than 170 high rate OHGPs have been completed that are producing comingled from multi-layered sandstone formation. As the field matures, problems such as premature water and gas breakthrough are becoming increasingly common requiring the completion system to be inherently flexible to address
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Susilo, Yoliandri, Khsitij Dharmadhikari, Sherif Taha, et al. "Multizone Open Hole Gravel Pack Completion with Selective Production Capability in ACG Field – Azerbaijan." In SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215152-ms.

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Abstract Azeri-Chirag-Gunashli (ACG) is a giant field located in the Azerbaijan sector of the Caspian Sea. The major reservoir zones are multi layers sandstone formations and weakly consolidated where Open Hole Gravel Pack (OHGP) completions have become the standard design for production wells. To date more than 170 high rate OHGPs have been completed that are producing comingled from multi-layered sandstone formation. As the field matures, problems such as premature water and gas breakthrough are becoming increasingly common requiring the completion system to be inherently flexible to address
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Malik, Muhammad Usman, Monaf S. Alaithan, and Mugdad M. BoHulaiqa. "Innovative Acoustic System for Data Detecting in Open Hole Multi Stage Frac Completions." In SPE International Hydraulic Fracturing Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215663-ms.

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Abstract The importance of data accuracy cannot be overstated, especially in the oilfield where every second counts. It is important to know exactly what is happening down the hole and act quickly in case of emergencies. However, the importance of data accuracy goes far beyond just decision making as it improves productivity. A pioneering project in the middle east has utilized a new acoustic monitoring technology to improve data accuracy in open hole multi-stage frac operations. An innovative acoustic monitoring system has been developed in order to have an additional layer of acoustic and pr
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Al Haji, Ahmed M., Kenechukwu O. Ufondu, Rommel Ernesto Arias Urbina, and Mohammad Noor Nazri. "15KPSI MSF System with Metal Expandable Open-Hole Packers; Making a Difference in Delivering Required Capabilities to Challenging Wells." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211781-ms.

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Abstract This paper describes the design, implementation details, and the added value of deploying a 15 kpsi Multi-Stage Fracking (MSF) system with an open hole (OH) metal expandable packer. The system would be an additional enabler for successful OH MSF system deployment, especially for wells with concerns over wellbore stability (pack off and/or washouts), getting stuck while running with the completion string to the deployment depth and in Extended Reach Drilling (ERD) wells. The system used four (4) stages deployed in a 5-7/8″ open hole with a length of 3,000 ft. The completion equipment w
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