Hybrid journal (It can contain Open Access articles) ISSN (Print) 1753-3309 - ISSN (Online) 1753-3317 Published by Inderscience Publishers[439 journals]
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Authors:Zhiyong Li, Yu Zhou, Long Qu, Xufei Zhang Pages: 103 - 125 Abstract: Once the drilling fluid filtrate invades along microfractures of coal reservoirs during the drilling process, it can cause notable wall instability. Foam spheres would infiltrate and move through the pores and into the fractures under drilling differential pressure between the wellbore and formation. As a result, microfoams deformed and the volume became larger to achieve plugging. In order to improve the foam foaming performance and stability during drilling, thereby enhancing the plugging effect, a new type of anionic Gemini surfactant, ZY-1, was designed and synthesised. Not only did ZY-1 reduce surface tension but also the half-life of foams produced was more than three times that of conventional foaming agents. Furthermore, contact angle recovery rate of cores and the desorption rate of drilling fluid reached 86% and 88.24%, respectively. And the plugging rate and gas permeability recovery value after pollution were both above 90% for the developed low-damage drilling fluid. [Received: October 24, 2021; Accepted: April 26, 2022] Keywords: coalbed methane; CBM; plugging; reservoir protection; surfactant; foam drilling fluid Citation: International Journal of Oil, Gas and Coal Technology, Vol. 32, No. 2 (2023) pp. 103 - 125 PubDate: 2023-01-04T23:20:50-05:00 DOI: 10.1504/IJOGCT.2023.128050 Issue No:Vol. 32, No. 2 (2023)
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Authors:Branimir Stanisavljevic, Vesna Karovic Maricic, Irena Isakov Pages: 126 - 140 Abstract: An accurate fracture gradient value is one of the most important issues in oil and gas well design and drilling. The value of a fracture gradient is a critical parameter for determining the drilling mud weight and selecting the proper depths for setting the casing in the planning process of drilling operations. This paper proposed the new curve model of fracture gradient for the south-central Kazakhstan (central Asia) region based on the analysis of leak-off test and format integrity test results. Data from more than 400 tested wells were analysed and compared with the results of existing methods for predicting the fracture gradient and with the results from previous drilling projects in that region. By using the new curve model, the more precise values of fracture gradient are determined. Besides an improved fracture gradient model development and validation, the model's analytical expressions are presented. The article's most important results are determining the model's values of fracture gradient and providing a more accurate calculation of mud weight, less mud losses, more precise evaluations of cementing operations, better selection of the casing setting depth and improved drilling safety. [Received: February 13, 2022; Accepted: June 2, 2022] Keywords: fracture gradient; new curve model; oil well design; drilling; Kazakhstan Citation: International Journal of Oil, Gas and Coal Technology, Vol. 32, No. 2 (2023) pp. 126 - 140 PubDate: 2023-01-04T23:20:50-05:00 DOI: 10.1504/IJOGCT.2023.128042 Issue No:Vol. 32, No. 2 (2023)
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Authors:Xinyu Liu, Jianxun Quan, Xiaofei Liu, Haozhe Jin, Guofu Ou Pages: 141 - 156 Abstract: The deposition of NH<SUB align="right">4Cl particles in the equipment can cause potential safety hazards in petrochemical enterprises. In this study, a gas-solid-flow experimental equipment has been built to explore the characteristics of NH<SUB align="right">4Cl deposition with different humidity and fluid velocity. The results show that: the gas flow rate, relative humidity (RH), and duration have little influence on the deposition position of NH<SUB align="right">4Cl particles, but they affect the deposition amount of NH<SUB align="right">4Cl particles greatly; due to the formation of liquid droplets and the influence of secondary flow in the elbow, the deposition increases rapidly in the range of 45°-75° and reaches 0.57 g at 67.5°. After evaluating the experiment, a computational fluid dynamics (CFDs) coupled with DEM method is employed to analyse the flow parameters of particles. Numerical results of particle deposition show a good agreement with the corresponding experimental data. [Received: February 25, 2022; Accepted: July 6, 2022] Keywords: gas-solid flow; particles deposit; NH4Cl; CFD-DEM coupling Citation: International Journal of Oil, Gas and Coal Technology, Vol. 32, No. 2 (2023) pp. 141 - 156 PubDate: 2023-01-04T23:20:50-05:00 DOI: 10.1504/IJOGCT.2023.128051 Issue No:Vol. 32, No. 2 (2023)
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Authors:Mohammad Hossein Zareian, Seyed Reza Shadizadeh, Abolghasem Emamzadeh Pages: 157 - 176 Abstract: Massive demand for fossil fuel against limited available oil conventional reservoirs worldwide highlights that innovative enhanced oil recovery method. Nowadays, due to the accessibility of seawater and rivers, smart water and low salinity water injection have gained more attention. This paper addresses the mechanisms behind smart water injection and studies a real case from a carbonate oil reservoir. For this purpose, contact angle measurement was employed to screen and find the best smart water composition among different types of water. A core flooding experiment was used to evaluate the performance of the smart water injection in calcite rock. Two different scenarios were implemented in the core displacement experiment to examine the effect of divalent ions. Based on the experimental results, the main mechanism behind the smart water injection is the wettability alteration of the calcite rock surface. Also, as the most central divalent ions, an increase in calcium ions has been effective in increasing the water wetness of the rock surface, resulting in river water with double calcium ion content as the best smart water. [Received: November 8, 2021; Accepted: June 2, 2022] Keywords: smart water; carbonated reservoir; wettability alteration; contact angle; coreflooding; calcite Citation: International Journal of Oil, Gas and Coal Technology, Vol. 32, No. 2 (2023) pp. 157 - 176 PubDate: 2023-01-04T23:20:50-05:00 DOI: 10.1504/IJOGCT.2023.128045 Issue No:Vol. 32, No. 2 (2023)
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Authors:Peng Gao, Hong Jiang Pages: 177 - 204 Abstract: Conventional exergy analysis can only quantitatively analyse the exergy destruction of devices, while advanced exergy analysis can obtain the detailed distribution of the exergy destruction. For analysing the energy consumption of equipment in the process of cryogenic helium extraction, advanced exergy analysis was performed on a modified process for natural gas helium extraction. The analysis results show that the largest part of most equipment exergy destruction is endogenous exergy destruction; the equipment that has the largest exergy destruction in the process is the cold box, followed by the compressor. The exergy destruction of compression equipment is similar, but the exergy destruction of different heat exchange equipment is different. Sensitivity analysis shows that in order to minimise the unavoidable exergy destruction of the column, the recommended feed pressure of the primary concentration column is 3,200, and the recommended feed temperature of the cryogenic separator before the secondary concentration column is -150. [Received: January 18, 2022; Accepted: June 14, 2022] Keywords: natural gas; helium extraction; modified process; energy saving; energy consumption analysis; advanced exergy analysis Citation: International Journal of Oil, Gas and Coal Technology, Vol. 32, No. 2 (2023) pp. 177 - 204 PubDate: 2023-01-04T23:20:50-05:00 DOI: 10.1504/IJOGCT.2023.128040 Issue No:Vol. 32, No. 2 (2023)
Hybrid journal (It can contain Open Access articles)
[439 journals]
