关键词: 黄原胶 , 2－丙烯酰胺基－2－甲基丙磺酸 , 膨润土 , 油田堵水剂

Abstract: Xanthan gum(XG)/2-acrylamido-2-methylpropanesulfonic acid(AMPS)/bentonite composite water plugging agent for oil field was synthesized by aqueous solution polymerization. Effect of the amount of AMPS, bentonite, crosslinking agent and initiator on waterabsorption capacity of water shutoff agent were investigated. Waterabsorbency and water retaining rate of the water shutoff agent at different temperature were tested. NaCl concentration on waterabsorption capacity of water shutoff agent were researched. The results show that the optimum process conditions were obtained as follows: w(bentonite) is 15％, w(AMPS) is 3％, w(crosslinking agent) is 2％, w(initiator) is 2.5%, and reaction temperature is 40 ℃ for 4 hours. Under the optimum technological conditions, with the environmental temperature of 20 ℃, waterabsorbency for deionized water and 0.9％ NaCl solution of the water plugging agent for oil field are respectively 1 677 g/g,165 g/g. With the environmental temperature of 80 ℃, waterabsorbency for deionized water of the water plugging agent for oil field are respectively 1 590 g/g,within 12 h can hold water over 20%, which possessed a good thermal stability and salt tolerance.

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