Author
Listed:
- Qiao Wang
(School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)
- Zhaofeng Wang
(School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)
- Jiwei Yue
(School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China)
- Fenghua An
(School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)
- Jiaxin Dong
(School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)
- Yongxin Sun
(School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)
Abstract
Temperature is the primary factor affecting the law of coal gas desorption. When the core method is used to measure the coal seam gas content (CSGS), the temperature of the coal core sample (CCS) will increase. The heat generated by the core bit cutting and rubbing the coal during coring is transferred to the CCS through the core tube, resulting in the temperature rising of the CCS. Because the CCS entering the core tube during coring is a dynamic process, the temperature of CCS is difficult to measure. To solve this problem, the temperatures of the core tube wall during coring in the Jiulishan coal mine (JLS), Guhanshan coal mine (GHS) and Zhaogu coal mine (ZG) at the core depth of 20 m were measured by the self-designed temperature measuring device. The thermodynamic models of the core bit and the core tube during coring were established. The reliability of the model was verified by comparing the numerical simulation results with the field measurement results. The verified model was used to predict the temperature changes of the core tube wall during coring in different strength coal seams and different core depths. The results show that the temperature change of the core tube wall was divided into a slowly temperature rising stage Ⅰ, a fast temperature rising stage Ⅱ and a slowly temperature rising and slowly temperature falling stage Ⅲ, which correspond to the process of pushing the core tube, drilling the CCS and early stage and later stage of withdrawing the core tube, respectively. The maximum temperature of the core tube wall appears in the first 3 min of withdrawing the core tube, and increases with the core depth increasing. The temperature of the measuring point at the end of drilling the CCS and the maximum temperature during coring linearly increase with the core depth. The temperature heating rate of the core tube is negatively linear, with the coal seam strength during pushing the core tube wall process. However, the temperature heating rate of the core tube wall is positively linear with the coal seam strength during drilling the CCS process. This study can provide a basis for further research on the dynamic distribution characteristics of temperature in the CCS during coring, which is of profound significance to calculate the gas loss amount and CSGC.
Suggested Citation
Qiao Wang & Zhaofeng Wang & Jiwei Yue & Fenghua An & Jiaxin Dong & Yongxin Sun, 2022.
"Temperature Variation Law of Core Tube Wall during Coring in Different Strength Coal Seams: Experiment and Modelling,"
Energies, MDPI, vol. 15(5), pages 1-21, February.
Handle:
RePEc:gam:jeners:v:15:y:2022:i:5:p:1703-:d:758049
Download full text from publisher
Most related items
These are the items that most often cite the same works as this one and are cited by the same works as this one.
- Nikodem Szlązak & Marek Korzec & Kazimierz Piergies, 2021.
"The Determination of the Methane Content of Coal Seams Based on Drill Cutting and Core Samples from Coal Mine Roadway,"
Energies, MDPI, vol. 15(1), pages 1-14, December.
- Boris V. Malozyomov & Vladimir Ivanovich Golik & Vladimir Brigida & Vladislav V. Kukartsev & Yadviga A. Tynchenko & Andrey A. Boyko & Sergey V. Tynchenko, 2023.
"Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors,"
Energies, MDPI, vol. 16(11), pages 1-16, May.
- Feng Zhang & Jinshan Zhang, 2022.
"Research on Joint Protection Layers and Gas Prevention Technology in Outburst Coal Seams,"
Sustainability, MDPI, vol. 14(14), pages 1-15, July.
Corrections
All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1703-:d:758049. See general information about how to correct material in RePEc.
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .
Please note that corrections may take a couple of weeks to filter through
the various RePEc services.