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Mechanism of pluggings removal by hydraulic pulse wave assisted with desorption reagent in asphaltene plugged formation
HE Yanlong1,2, DONG Qiaoling3, JING Cheng1,2, GU Xiaoyu1,2, DONG Hao4, REN Long1,2, YANG Jianxuan5
(1.School of Petroleum Engineering in Xi 'an Shiyou University, Xi 'an 710065, China;2.Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi 'an 710065, China;3.Oil Production Engineering Institute of PetroChina Daqing Oilfield Company Limited, Daqing 163453, China;4.College of Chemistry and Environmental Engineering in Yangtze University, Jingzhou 434023, China;5.No.3 Oil Production Company of PetroChina Qinghai Oilfield Company Limited, Haixi 816400, China)
Abstract:
The adsorption model of asphaltene adsorbed on different kinds of minerals was investigated. And the technical parameters of the hydraulic pulse wave assisted with the desorption reagent were optimized by the orthogonal test (desorption reagent concentration, magnitude of the hydraulic pulse wave, action time, desorption time and pulse frequency). Based on the optimum technical parameters, the adsorption behavior and the kinetics of asphaltene adsorbed on different kinds of minerals, and the desorption behavior and the kinetics of the hydraulic pulse wave assisted with the desorption reagent were studied. The results show that the montmorillonite, chlorite and kaolinite control the adsorption-desorption process of asphaltene. The double constant rate equation and Elovich equation reflect the process of hydraulic pulse wave assisted with desorption reagent well. Compared with the higher concentration of the desorption reagent, the anxo-action of the hydraulic pulse wave are significant under the lower concentration of the desorption reagent. During the early period of the synergistic action by the hydraulic pulse wave and the desorption reagent, desorption effects are promoted by the hydraulic pulse wave, however, the overall effects are dominated by the chemical desorption agent.
Key words:  asphaltene  hydraulic pulse wave  desorption reagent  adsorption kinetics  desorption kinetics