Hybrid journal (It can contain Open Access articles) ISSN (Print) 1753-3309 - ISSN (Online) 1753-3317 Published by Inderscience Publishers[439 journals]
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:Haijing Wang, Chao Zhang, Bo Zhou, Shifeng Xue, Peng Jia, Xiuxing Zhu Pages: 121 - 151 Abstract: A coupled thermo-hydro-mechanical-damage model considering anisotropic stiffness degradation of rock after shear damage is developed for the first time, and the coupling mechanism and failure behaviour of caprock in steam assisted gravity drainage (SAGD) operations are systematically investigated using analytical and numerical approaches. New insights into the failure characteristics of caprock were obtained. The damage of caprock is mostly induced by shear and initiates near the interface directly opposite the well pair in the earliest stage of SAGD production and propagates rapidly to form a main crack. The vertical and zigzag main crack may penetrate the caprock, while the secondary cracks on both sides are mostly inclined and straight that they cannot penetrate the caprock. Failure modes of caprock are observed including penetrating crack, non-penetrating crack and interface damage. This study will be helpful in accurately evaluating the caprock integrity and efficiently breaking interbedded shale or mudstone layers in thermal recovery reservoirs. [Received: June 2, 2023; Accepted: February 13, 2024] Keywords: thermo-hydro-mechanical-damage; THMD; analytical analysis; numerical simulation; caprock failure; steam assisted gravity drainage; SAGD Citation: International Journal of Oil, Gas and Coal Technology, Vol. 36, No. 2 (2024) pp. 121 - 151 PubDate: 2024-08-01T23:20:50-05:00 DOI: 10.1504/IJOGCT.2024.140273 Issue No:Vol. 36, No. 2 (2024)
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:Guojie Cui, Hongshan Zhao, Runfeng Cai, Donghong Guo, Sheng Zhong, Wenchang Wang Pages: 152 - 169 Abstract: Fatigue failure of drill string occurs frequently in deep wells. However, the commonly used fatigue ratio is difficult to evaluate drill string fatigue safety accurately. In this paper, considering the characteristics of super slenderness ratio of drill string and collision with the wellbore wall, the coupling vibration of drill string is studied, and the vortex characteristics and dynamic stress of the drill string are calculated more accurately. On this basis, combined with the calculation method of fatigue coefficient under asymmetric variable stress amplitude, the strength criterion of fatigue failure of drill string under dynamic condition is established. The results show that this method can better understand the working state of the drill string in the wellbore and predict the risk position of fatigue failure of whole drill string more accurately in vertical wells. [Received: March 28, 2023; Accepted: February 13, 2024] Keywords: drill string; coupled vibration; dynamic stress; fatigue failure Citation: International Journal of Oil, Gas and Coal Technology, Vol. 36, No. 2 (2024) pp. 152 - 169 PubDate: 2024-08-01T23:20:50-05:00 DOI: 10.1504/IJOGCT.2024.140276 Issue No:Vol. 36, No. 2 (2024)
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:Mingqiang Wei, Yuhong Wang, Yonggang Duan, Yan Li, Yihe Du Pages: 170 - 196 Abstract: This study selects suitable epoxy resin as a sustained-release material. The sustained-release carrier was mixed with different water-soluble tracers to create a solid sustained-release tracer. The material's microstructure, compression performance, and thermal stability were characterised and analysed. Considering the stability and mechanical properties of the prepared solid spline, the single-factor experiment and a dynamic scouring test were carried out using epoxy resin B and a sodium bromide tracer. The single-factor experiment showed that tracer release increased with temperature and dosage and decreased with mineralisation. The highest release of sodium bromide tracer occurred at pH 7. The flow rate experiment indicated a positive correlation between the flow rate and the cumulative release rate of the tracer. The first-order kinetic equation is a dependable approach for elucidating the release phenomenon of the sustained-release solid tracer. The tracers provide a new way to synthesise long-term sustained-release solid tracers. [Received: January 4, 2024; Accepted: March 4, 2024] Keywords: epoxy resin; sustained-release material; sustained-release tracer; single-factor experiment; the first-order kinetic equation Citation: International Journal of Oil, Gas and Coal Technology, Vol. 36, No. 2 (2024) pp. 170 - 196 PubDate: 2024-08-01T23:20:50-05:00 DOI: 10.1504/IJOGCT.2024.140282 Issue No:Vol. 36, No. 2 (2024)
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:Longfei Feng, Quan Zhang, Guangjian Liu Pages: 197 - 218 Abstract: Deep, high-stress, high-strength mining conditions will make the energy release from the mining fields more intensive. The influence mechanism of mining speed on energy release in the mining area was studied using elastic mechanics theory, numerical simulation, and on-site measurement methods. When the average mining speed increases from 3.68 m/d to 5.6 m/d, the cyclic weighting step distance increases from 29.5 m to 38.85 m, indicating that the faster the mining speed, the larger the periodic fracture size of the inferior key strata, and the more energy the bending and sinking static load and dynamic load input into the coal body, the easier to induce rock burst. Based on the curve of mining speed and high-energy mining earthquakes frequency, the critical safe mining speed of Hujiahe Coal Mine is determined to be 4.8 m/d. These conclusions can provide a basis for the mining intensity optimisation in rockburst mines. [Received: May 17, 2023; Accepted: February 27, 2024] Keywords: mining speed; static load potential energy; bending elastic energy; rock burst; mining intensity optimisation Citation: International Journal of Oil, Gas and Coal Technology, Vol. 36, No. 2 (2024) pp. 197 - 218 PubDate: 2024-08-01T23:20:50-05:00 DOI: 10.1504/IJOGCT.2024.140286 Issue No:Vol. 36, No. 2 (2024)
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:Longfei Feng, Quan Zhang, Guangjian Liu Pages: 219 - 243 Abstract: The compression ignition engines are extremely significant in the field of energy, transport, and agriculture owing to their reliability and efficiency. The engines, on the other hand, are a major source of greenhouse gases and toxic emissions. According to global emission guidelines for sustaining a healthy environment, the measures needed to decrease pollution are of utmost important. Recent developments in diesel engines, notably in the fuel injection system, have made it possible to achieve the required levels of controlled emissions. Adopting the right fuel injection techniques, which significantly improve combustion quality, has resulted in a potential improvement in engine performance with regulated emissions in diesel engines. Delivering the fuel with higher 'fuel injection pressure' into the combustion chamber could reduce the carbon monoxide and particulate emissions with minimum 'specific fuel consumption' but the approach is not effective in controlling oxides of nitrogen emissions. On the other hand, the other fuel injection techniques like pilot injection and 'split injection' with optimised 'injection timing' help in reducing NO<SUB align="right">X emission from the engines with better power output. This review article focuses on a detailed study of various fuel injection techniques along with advantages for improving engine performance and reducing exhaust emissions. [Received: August 18, 2023; Accepted: November 17, 2023] Keywords: compression ignition engine; fuel injection pressure; FIP; electronic fuel injection; EFI; brake thermal efficiency; brake specific energy consumption; split/multiple injection; fuel injection timing; FIT Citation: International Journal of Oil, Gas and Coal Technology, Vol. 36, No. 2 (2024) pp. 219 - 243 PubDate: 2024-08-01T23:20:50-05:00 DOI: 10.1504/IJOGCT.2024.140281 Issue No:Vol. 36, No. 2 (2024)
Hybrid journal (It can contain Open Access articles)
[439 journals]
