Flow of drag-reducing surfactant solutions in rough pipes |
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| Authors: | J Ró?ański |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China;2. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China;3. Sichuan Guangya Polymer Chemical Co.,Ltd, Nanchong, 637500, People’s Republic of China;1. New Mexico Tech, USA;2. Chemplex Solvay Group, USA;1. School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401332, China;2. Geosciences and Geological and Petroleum Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States;3. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;4. School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401332, China;1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;3. Downhole Service Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China;4. Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China;5. Shengli Oil Production Plant, Sinopec Shengli Oilfield Branch, Dongying 257000, China |
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| Abstract: | The paper reports the results of experimental study of the flow of hexadecyltrimethylammonium chloride (CTAC) solutions with addition of sodium salicylate (NaSal) in the rough pipes. Measurements were performed in the range of the surfactant concentration from 200 to 400 ppm at a constant molar ratio CTAC/NaSal of 1:2. Five pipes of the relative roughness k/D varying from 1.2 × 10?2 to 5.6 × 10?2, obtained by the covering of inner surface of the pipes with glued silicon carbide particles of different size, were studied. The roughness was observed to increase the drag of flow of CTAC/NaSal solutions already at Reynolds numbers higher than 800. With increasing relative roughness k/D, the critical value of Reynolds number, at which the drag reduction disappears, was found to decrease. However, no influence of the roughness on the critical shear stress was noted. The ratio of the critical Reynolds number for rough pipes to that of hydraulically smooth pipes was independent of the surfactant concentration. The degree of drag reduction by the flow of surfactants was greater in rough pipes than in smooth pipes. |
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