Productivity Formula of Horizontal Well in Low-Permeability Gas Reservoir considering Multiple Factors by Yan Feng, Mingqiu Li, Qingyuan Deng, Peng Yu, Xiuqing Li, Xi Yang

“…The analysis results show that stress sensitivity has the most significant effect on horizontal gas well production, followed by threshold pressure gradient, and the gas slippage has the least effect. …”
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Wellbore cleaning technologies for shale-gas horizontal wells: Difficulties and countermeasures by Huali Zhang, Sheng Yang, Dongming Liu, Yufei Li, Wei Luo, Junwu Li

“…It is vital to remove the residual bridge plug debris and sand in wellbore cleaning operation and to ensure an unblocked downhole production channel of shale gas well for a safe and smooth production process. …”
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Design and Parameter Analysis of New Type of Motor Driven Wheel Traction Device by Zhang Yong, Gao Deli, Zheng Yanchao, Zuo Mingde, Liang Qimin, Hui Shuyi

“…A new type of motor drive wheel traction device is proposed,the structure and principle of the traction device is elaborated.The parameter calculation model is established to calculate the relevant parameters and analyze the obstacle-surmounting ability of traction device.The changes relationship of each parameter is verified and calculated.The traction device is desirable in stability and meshing of actuator and flexible in control of the tractor.The stability,carrying capacity and wellbore adaptability of the tractor in down-hole driver are improved.In addition,it can be enhance the flexible bending adaptability and over-obstacle capacity of tractor in down-hole operation.It can be provides a new idea for designing and development of down-hole traction device in the oil and gas well areas.…”
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Organics and inorganics in flow back and produced water from shale gas operations: treatment and identification of glycols using gas chromatography–mass spectrometry by Seongyun Kim, Pinar Omur-Ozbek, Ken Carlson, Sangchul Lee, Eun-Sik Kim, Min-Jin Hwang, Ji-Hee Son, Woochul Kang

“…This study investigated the efficiency of different water treatment processes in reducing propylene glycol (PG), ethylene glycol (EG), ethylene glycol monobutyl ether (EGME), and other water quality parameters in flow back/produced water from a shale gas well operation. EG, PG, and EGME are the most widely used chemicals in hydraulic fracturing; however, limited investigations on these chemicals have been performed to date. …”
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Identifying Active Rather than Total Methanotrophs Inhabiting Surface Soil Is Essential for the Microbial Prospection of Gas Reservoirs by Kewei Xu, Cheng Tao, Lei Gu, Xuying Zheng, Yuanyuan Ma, Zhengfei Yan, Yongge Sun, Yuanfeng Cai, Zhongjun Jia

“…Initially, by comparing the abundance of the <i>pmoA</i> genes determined by quantitative PCR (qPCR), no significant difference was found between gas well and non-gas well soils, indicating that the abundance of total MOB may not necessarily reflect the distribution of the underlying gas reservoirs. …”
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Characteristics of Fracturing Fluid Invasion Layer and Its Influence on Gas Production of Shale Gas Reservoirs by Shijun Huang, Jiaojiao Zhang, Jin Shi, Fenglan Zhao, Xianggang Duan

“…The results show that during the hydraulic fracturing of shale gas wells, fracturing fluid can quickly enter the complex fracture network, and then slowly enter the shale matrix under various mechanisms to form the fracturing fluid invasion layer. …”
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Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells by Dongfeng Hu, Lan Ren, Zhenxiang Li, Jinzhou Zhao, Ran Lin, Tingxue Jiang

“…When deep and ultra-deep shale gas well fracturing is carried out, multi-cluster fracturing can hardly realize synchronous initiation and propagation of hydraulic fractures due to the combined effects of heterogeneity of deep in-situ stress and ''dense cluster'' fracture arrangement, and the strong interference between fractures aggravates the unbalanced fracture propagation degree. …”
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Technological problems and fundamental principles of methods of engineering-geocryological exploration during construction and exploitation of wells in permafrost rock mass by Z. N. Cherkai, E. B. Gridina

“…It concludes a list of factors, which should be considered during gas well drilling in northern zones for meeting the «safety – sustainability – low waste» criteria.…”
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Application of anticorrosive materials in cement slurry: Progress and prospect by Yihang Zhang, Jiaxin Wen, Xuejiao Yin, Xin Zhang

“…During gas well cementing operation, the erosion of acidic formation corrosive medium will destroy the cementation between the cement slurry and the sidewall in the well sealing section, reduce the mechanical properties of the cement paste, cause problems such as sidewall collapse and casing damage, seriously endanger the normal exploitation of oil and gas resources, and cause major safety accidents. …”
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US natural gas - a tale with many twists by Rogers, H

“…Natural gas in North America has a much longer history than in Europe. The first US gas well was sunk in 1821, in Fredonia, New York, although it wasn’t until the 1920s that any significant effort was put into building a pipeline infrastructure for gas. …”

MRI of the brain with ultra-short echo-time pulse sequences. by Waldman, A, Rees, J, Brock, C, Robson, M, Gatehouse, P, Bydder, G

The dynamic economic evaluation method of shale gas resources by Gang-yi Zhai, Xiang-lin Chen, Xiang-hua Xia, Zhi Zhou, Tian-xu Guo, Guo-heng Liu, Rui-han Yuan

“…The Arps hyperbolic decreasing curve model will be used in the evaluation of single shale gas well production, which can evaluate single well production of shale gas by fitting the existing dynamic production data to generate the production decreasing curve. …”
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A Logical Growth Model considering the influence of shale gas reservoirs and development characteristics by Qun Zhao, Hongyan Wang, Qinping Sun, Xinchun Jiang, Rongze Yu, Lixia Kang, Xuefan Wang

“…Some scholars have applied the Logical Growth Model (LGM) in the production decline analysis of unconventional gas wells, but the influences of shale gas reservoir and development characteristics are not taken into consideration. …”
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Properties study of a local bentonite as an additive in oil and gas industry by Man, Sarimah, Junin, Radzuan, Samsuri, Ariffin, Mohamed Osman, Adil

“…Therefore, the total cost of oil and gas well development will be reduced since the additive is a local material.…”
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A new methodology for optimization and prediction of rate of penetration during drilling operations by Zhao, Yanru, Noorbakhsh, Amin, Koopialipoor, Mohammadreza, Azizi, Aydin, Tahir, M. M.

“…In the present paper, to predict penetration rate during drilling process, several ANN models were developed based on the data obtained from drilling of a gas well located in south of Iran. Regarding the R2 and RMSE values of the developed models, the best model was selected for prediction of penetration rate. …”

Evaluation of drilling muds enhanced with modified starch for HPHT well applications by Aliyu Adebayo Sulaimon, Sarah Abidemi Akintola, Mohd Adam Bin Mohd Johari, Sunday Oloruntoba Isehunwa

“…Abstract The use of carboxymethyl cellulose (CMC) in oil and gas well drilling operations has improved the filtration loss and mud cake properties of drilling muds. …”
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Factors influencing the horizontal inter-well interference in tight gas reservoirs by Zhang Lipeng, Wang Tianxiang, Albouzedy Ibrahim, Wang Wendong, Ren Xiang

“…Moderate inter-well interference can improve single-well production, but excessive inter-well interference will reduce gas well production and slow production recovery. This paper analyzes the causes of inter-well interference from well patterns and spacing, single-stage fracturing scale and engineering. …”
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Decision-Making of Underwater Cooperative Confrontation Based on MODPSO by Na Wei, Mingyong Liu, Weibin Cheng

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Gas Diffusion and Flow in Shale Nanopores with Bound Water Films by Tianyi Zhao, Yuan Ji

“…The study lays a theoretical foundation for the reasonable evaluation and prediction of shale gas well capacity under reservoir water conditions.…”
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Drilling in Gas Hydrates: Managing Gas Appearance Risks by Ruslan Gizatullin, Mikhail Dvoynikov, Natalya Romanova, Victor Nikitin

“…A method of preventing leaks in the intercasing space of the gas well is the use of colmatating solution. An aqueous solution of sodium silicate with the addition of 2% polymer is used as a colmatating composition.…”
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