Forthcoming and Online First Articles

International Journal of Oil, Gas and Coal Technology

International Journal of Oil, Gas and Coal Technology (IJOGCT)

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International Journal of Oil, Gas and Coal Technology (6 papers in press)

Regular Issues

  •   Free full-text access Open AccessImpact of surface choking on gas-lift stability and flow behaviour in oil producing wells
    ( Free Full-text Access ) CC-BY-NC-ND
    by Joao Chidamoio, Lateef Akanji 
    Abstract: The effect of surface choking on gaslift stability and flow regime transition in vertical cylindrical pipe during gaslift operation is investigated. Here, a laboratory scale multiphase flow rig was designed, fabricated, and assembled. Gas rates of 0.000113 and 0.000187 m3/s were imposed on a 1 mm single nozzle injector. Surface choking was implemented by setting the system to 15, 25, 50 and 100% opening. For each opening condition, transient pressure at four locations; corresponding to length-to-diameter ratios of 0.0, 18.3, 36.7, and 53.3, was recorded. Flow structure and regime transition are characterised by visual, photographic and slow-motion videos, recorded at each location. A transition from random peak-to-peak cyclic and periodic pressure oscillation, accompanied by pressure increase, is observed. Further, bubble size reduction characterised by low vorticity and turbulence is observed at 15% opening. It is concluded that surface choking must be complemented by knowledge of flow behaviour within the system. [Received: June 14, 2022; Accepted: March 20, 2023]
    Keywords: gas-lift; multiphase flow; instability; fluid flow structure.

  • Research on mine pressure law of isolated working face in close-distance thin coal seam under the influence of remaining coal pillar   Order a copy of this article
    by Yuyang Wang, Yong Zhang, Bo Xue, Jian Li, Lianchang Han, Hang Yu 
    Abstract: Aiming at the problem of abnormal pressure in close-distance thin coal seam isolated working face under remaining coal pillar. The stress distribution law of 33107 isolation working face is studied by combining theoretical analysis, numerical simulation, and field measurement. The working face roof’s mechanical properties and engineering characteristics were expounded under the remaining coal pillar. Obtained the stress distribution characteristics of the remaining coal pillar floor and calculated the disturbance range of stress. Numerically simulated and field measurements were carried out to verify the influence of the remaining coal pillars on the pressure of the 3# coal seam. The results show that the working resistance of the hydraulic support increases by 10-12 MPa, and the dynamic load coefficient increases by 15.38%-28.46% in the area affected by the remaining coal pillar. The peak stress is more significant than 40 MPa, the stress concentration level is 1.52 times. [Received: November 18, 2022; Accepted: July 16, 2023]
    Keywords: thin coal seam; isolated working face; mine pressure law; remaining coal pillar; strata movement.

  • Development characteristics and prediction of fractures in deep-ultradeep tight sandstone reservoirs of Kuqa Depression: a case study of the Bashijiqike and Baxigai formations in Dabei 9 Block   Order a copy of this article
    by Peiming Huang, Wei Ju, Aslaug Clemmensen Glad, Yu Zhong, Haoran Xu, Yan Liang 
    Abstract: Deep and ultra-deep tight sandstone gas reservoirs are extremely important promising future energy. Natural fractures can improve the permeability and impact the overall reservoir quality. With the Dabei 9 Block of Kuqa Depression as an example, this study investigated and predicted the development and distribution of natural fractures in the tight sandstone reservoir based on R/S analysis method. Tensile-shear fractures are dominant fracture type within the block. Natural fractures primarily strike NW-SE and NE-SW directions with relatively high dip angle. Nearly 50% fractures are unfilled and partly filled. The coefficient index of fracture development Q was defined and calculated according to the lg(R/S) function. Error analysis of fracture prediction was also carried out. The results show that the Q corresponds to fracture density, and higher Q value commonly indicates larger density. Errors between fracture predictions and measures can be caused by various factors including fracture occurrence, fracture filling, limitation of conventional logging range, and multiple interpretations of logging curves. This study is expected to provide geological references for tight sandstone gas exploration and development in the Dabei 9 Block of Kuqa Depression. [Received: September 5, 2022; Accepted: August 19, 2023]
    Keywords: fracture development characteristics; fracture prediction; R/S analysis method; ultra-deep tight sandstone; Dabei 9 Block; Kuqa Depression.

  • Study and application of evaluation method for fracability of deep CBM reservoir - taking the Daning-Jixian block in the Ordos Basin as an example   Order a copy of this article
    by Duo Wang, Zhidi Liu 
    Abstract: The key to increasing production of deep coalbed methane is to evaluate the fracability of the reservoir, but existing methods cannot meet the requirements of fracability evaluation. This study is based on the close relationship between the main controlling factors of fracability and the operation pressure during the sand carrying fluid stage, the AHP was used to determine the weights of the main controlling factors of fracability in coal seams and roof and floor, and based on this, a deep coalbed methane reservoir fracability evaluation model was established. The fracability of the 8 # coal seam and the roof and floor of the Daning Jixian block was evaluated using this model, and the evaluation results can be confirmed by the on-site fracturing operation and the fracability indoor experimental results. Therefore, this model can provide good technical support for the stimulation and transformation of deep coalbed methane reservoirs. [Received: August 2 2023; Accepted: November 27 2023]
    Keywords: deep CBM; AHP; main control factors; operation pressure; fracability.

  • An experimental investigation on preparation and performances of two diesel blends of karanj oil methyl ester   Order a copy of this article
    by Sushovan Chatterjee 
    Abstract: Solvent extraction of karanj seed was found more efficient over traditional mechanical means for oil extraction from raw seed as the former one tested more yield. The extracted oil was subjected to acid catalyst esterification and subsequently followed by alkali catalysed transesterification to produce fatty acid methyl ester. Physical, chemical and petrochemical features of the ester as well as two different blends with diesel (B10 and B20) were measured and compared with neat diesel. Performances of these fuels were tested in an unmodified single cylinder, water cooled, four stroke direct injection type diesel engine. On sample testing it was revealed that, the emission of carbon monoxide and hydrocarbon was less than what noticed during testing diesel alone, although the emission of oxides of nitrogen was somewhat more than what noticed in available diesel engine test results while using diesel only as fuel.
    Keywords: Pongamia pinnata; extraction; esterification; transesterification; biodiesel; engine performance.

  • A multi-factor coupled acid-etching fracture conductivity prediction model study   Order a copy of this article
    by Yu Fan, Jun Liang Peng, Qin Li, Jian Min, Zhouyang Wang 
    Abstract: Starting from the perspective of dynamic dissolution of acid rock reaction, we use fractal dimension and spatial curvature to research the influencing factors and changing rules of acid-etching crack morphology. Under the condition of considering the filtration loss, the relationship between fracture morphology and inflow capacity is investigated, and a multi-factor coupled acid-erosion fracture inflow capacity prediction model is established. The model explores the effects of mineral content, porosity, permeability, rock mechanical properties, acid-rock reaction, and effective distance of acid action on fracture conductivity. The model shows that: dolomite content and calcite content are positively correlated with the hydraulic conductivity; non-carbonate rock mineral content is negatively correlated with the hydraulic conductivity; porosity is positively correlated with the hydraulic conductivity; permeability is significantly positively correlated with the hydraulic conductivity. Youngs modulus is positively correlated with the hydraulic conductivity. Poissons ratio is negatively correlated with the hydraulic conductivity; and through the comparative analysis, we found that the main controlling factor is the permeability. [Received: July 31 2023; Accepted: October 15 2023]
    Keywords: fracture space; conductivity; fractal dimension; spatial curvature; prediction model.