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| Rules of paraffin deposit and comparative study on hot washing technology |
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LIN Riyi1,2, ZHANG Jianliang1,3, LI Xuanyu4, WANG Xinwei1, YANG Yong5, XU Deguang6, ZHANG Jiang6
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(1.College of New Energy in China University of Petroleum(East China), Qingdao 266580, China;2.Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum(East China), Qingdao 266580, China;3.China Oilfield Services Limited,Tianjian 300459, China;4.Liaohe Thermal Mining Machinery Manufacturing Branch of CNPC Bohai Petroleum Equipment Manufacturing Company Limited, Panjin 124209, China;5.New Energy Development Center of Shengli Petroleum Administration Company Limited, SINOPEC, Dongying 257000, China;6.Xianhe Oil Production Plant of Shengli Oilfield Branch Company, SINOPEC, Dongying 257000, China)
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| Abstract: |
| In view of the serious wax deposition in Shi 3 block in a certain area, the experimental study on the wax deposition rules and the simulation of wellbore temperature field were carried out. Based on HUANG Qiyu ' s waxing model, the parameters in the waxing deposition model were determined by the results of the rotary crude oil waxing deposition experiment. The radial temperature gradient and shear stress on the tube wall were obtained by the Fluent simulation, and the calculation formula of the well 3-3-11 waxing deposition rate was obtained. The amount of wax deposition for different days was determined under different heat washing methods. The wellbore temperature field model was established and the wellbore temperature field distribution was solved by the VB programming. The effects of different water injection temperature and water injection flow rate on the wellbore temperature field, hot washing time and water consumption were analyzed. The results show that due to the large heat loss along the wellbore, increasing the water injection temperature and water injection volume can reduce the hot wash time and increase the temperature field in the tubing, but the sensitivity gradually decreases. When the water injection temperature is 80 ℃ and the water injection flow rate is 2 t/h, the cost of a single hot wash is the lowest and the thermal efficiency is the highest. |
| Key words: thermal recovery of heavy oil waxing deposition experiment model of flow and heat transfer hot wash technology using hollow rod hot wash technology using in-casing |
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