International Journal of Oil, Gas and Coal Technology (5 papers in press)

Regular Issues

• Comprehensive evaluation of geology and engineering integration of XTT tight oil reservoir  
  by Xiu Li, Chengwen Liu, Tengwen Luo, Bingquan Ai, Aifeng Li, Luyao Gao, Shenglun Zhou 
  Abstract: The XTT Development Zone C7 offers promising exploration and evaluation potential. However, challenges arise due to factors such as strong heterogeneity, thin sand layers, and unstable distribution. These issues make it hard to identify the best drilling locations, often termed as 'sweet spots', especially in horizontal well deployment. This study uses both indoor experiments and field logging data. By building upon previous research, we: 1) calculated the rock's mechanical parameters; 2) created a model for petrophysical parameters; 3) established an in-situ stress model. From this data, we proposed a method to evaluate the sweet spots. This method combines both geological and engineering perspectives. Using this approach, we devised a sweet spot index specifically for the C7 region. Consequently, the XTT reservoir was categorised into three types to guide drilling operations. Our results indicate that type I and type II reservoirs are most suitable for development. The practical results from drilling and development validate our methodology's effectiveness. This research lays a foundation for deciding future drilling locations and optimising reservoir development. [Received: June 22, 2023; Accepted: October 15, 2023]
  Keywords: tight oil; rock mechanical parameters; geology-engineering integration; sweet spot.
  DOI: 10.1504/IJOGCT.2024.10063390
   
  
• Advanced calculation method for rheological characterisation of non-Newtonian drilling fluids using Herschel-Bulkley model  
  by Can Polat 
  Abstract: Determining Herschel-Bulkley model coefficients from rotational viscometers can be a challenging process. The variation of shear rates according to the rheological model type may bring uncertainty in the regression process evaluated for the estimation of the model coefficients. In this study, the derivation of the equation required for proper determination of the Herschel-Bulkley model coefficients is presented. The derivation process in question revealed the dependence on the Gaussian hypergeometric function. Attempts to determine all coefficients by means of the derived equation appear to yield unrealistic yield points. In this respect, yield point was estimated priorly using Bingham plastic model which was formulated using low speed/dial reading values. The method employed for parameter estimation additionally covers the solution for the not fully developed flow that occurs at low rotational speeds. The accuracy of the proposed method is demonstrated by making comparison with the measured frictional pressure loss data. [Received: September 24, 2023; Accepted: December 24, 2023]
  Keywords: Herschel Bulkley model; non-Newtonian drilling fluids; rheological characterisation; Gaussian hypergeometric function; advanced calculation; rotational viscometer; rheological model; yield point.
  DOI: 10.1504/IJOGCT.2024.10063392
   
  
• Review of the research progress on the application of blockchain technology in the oil and gas industry  
  by Shi Ding, Zhonghui Li, Arnaud Regis Kamgue Lenwoue, Yubo Li, Chuanfu Tang, Wentie Sun, Pengjie Hu, Wuchang Zhang 
  Abstract: Blockchain, as a distributed ledger technology is a decentralised, transparent and traceable technology. It has rapidly developed during the last decade and is widely used in many industries such as the oil and gas engineering. This study first describes the development, classification, characteristics and key technologies of the blockchain technology. Then, the application of blockchain and the challenges currently encountered during its implementation in the oil and gas industry are summarised. Finally, some feasible solutions are presented to overcome these challenges. The current work provides a deep insight of the main research progress of the application of blockchain technology in the oil and gas industry and is expected to enable the further development of this sector. [Received: May 18, 2023; Accepted: December 12, 2023]
  Keywords: research progress; blockchain technology; oil and gas industry; application.
  DOI: 10.1504/IJOGCT.2024.10063391
   
  
• Study and application of evaluation method for fracability of deep CBM reservoir - taking the Daning-Jixian block in the Ordos Basin as an example  
  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. 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.
  DOI: 10.1504/IJOGCT.2024.10063389
   
  
• An experimental investigation on preparation and performances of two diesel blends of karanj oil methyl ester  
  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. [Received: November 19, 2021; Accepted: October 30, 2023]
  Keywords: Pongamia pinnata; extraction; esterification; transesterification; biodiesel; engine performance.
  DOI: 10.1504/IJOGCT.2024.10063358