Experimental Study on Amphiphobic Surface Treating to Prevent Reservoir from Aqueous Phase Trapping Damage
Received date: 2008-11-10
Revised date: 2009-03-01
Online published: 2009-04-10
The traditional shielding temporary plugging technique can not effectively prevent the operating fluid from invading into tight reservoirs, while the effect of draining by decreasing the interface tension is always transient. Adding fluorochemical surfactant into operating fluid can increase the contact angle, which is a new way to reduce the capillary force and capillary imbibition. Wetting test was conducted to select the right fluorochemical surfactant which can change the reservoir wettability from liquid wetting to gas wetting. Slabbed core was soaked in the filtrate involving the selected surfactant at 100℃ for 40 minutes. The contact angle of filtrate and water on the treated slabbed core was 120° and 110°, respectively. Imbibition and core flow test showed that, compared with the untreated, water absorption decreased by 60%, imbibition rate decreased by 40%~50% and the displacement velocity increased by 2 factors. The results show that fluorochemical surfactant can alter the wettability of reservoir effectively, which has the potential for application in the prevention of water phase trapping.
Key words： Tight sandstone; Wettability; Gas wetting; Phase trap; Formation damage.
LIU Xue-Fen, KANG Yi-Li, YOU Li-Jun, WU Ping . Experimental Study on Amphiphobic Surface Treating to Prevent Reservoir from Aqueous Phase Trapping Damage[J]. Natural Gas Geoscience, 2009 , 20(2) : 292 -296 . DOI: 10.11764/j.issn.1672-1926.2009.02.292
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