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Study on Plugging and Displacement of Large⁃Size Advantage Channel in Bohai Oilfield
Meng Xiangha,Zhang Yunbao,Xia Huan,Liu Yigang,Wang Wei,Lü Jinlong,Yin Qingguo
Abstract483)   HTML    PDF (2582KB)(161)      
In order to solve the technical problem of injected fluid channeling in offshore oilfields,the basic performance evaluation of plugging agent,core hole plugging rate and the large⁃scale dominant channel treatment experiment of "plugging + profile control" oil increase and precipitation effect was carried out in Bohai reservoir. The results show that the blocking rate of blocking agent for large⁃scale dominant channel is higher than 90%,which indicates that it can meet the technical requirements of blocking large⁃scale dominant channel in Bohai reservoir.Combining the large⁃scale dominant channel plugging technology with chemical profile control and flooding technology,the dual effects of macro and micro fluid flow diversion can be obtained,and the effect of oil increase and precipitation is very obvious.Compared with hydrophobically associating polymer solution,although the viscosity of Cr3+ polymer gel is relatively low,the polymer molecular aggregates in Cr3+ polymer gel have "intramolecular" cross⁃linking structure characteristics,and have better compatibility with reservoir pores,which can establish an effective displacement pressure gradient in deep core,resulting in better fluid diversion effect and larger recovery.
2019, 32 (4): 44-51. DOI: 10.3969/j.issn.1006-396X.2019.04.008
Effect of ASP System on Alkali Sand and Quartz Sand Fracture Conductivity
Guo Qi, Lu Xiangguo, Peng Zhangang, Niu Liwei, Xia Huan
Abstract472)      PDF (1888KB)(339)      
Influence of ASP system on the fracture conductivity of alkaliresistance resin sands and quartz sands was studied. The results showed that compared with the weak base, the dissolution of strong base on the quartz sands was more serious. And the damage percentage of the particles was higher. Therefore the reduction of conductivity of fractures packed with sands was larger. Compared with quartz sands, there was little difference between the dissolution of weak base on the alkaliresistance resin sands and that of weak base on the alkaliresistance resin sands. So it was the same to conductivity. With the increase of closing pressure, the conductivity of quartz sands and alkaliresistance resin sands were both weakened. But the reduction degree became gradually small. Compared with quartz sands, the influence of closing pressure on the conductivity of fractures packed with alkaliresistance resin sands was weak. And the fracture conductivity capacity was stronger.
2016, 29 (4): 57-61. DOI: 10.3969/j.issn.1006-396X.2016.04.012