
科学技术与工程

中国技术经济学会
原油和润湿反转化学剂影响下的可溶镁合金溶解速率
张景涛 , 田勇 , 梁天博 , 刘雄飞 , 石章志
科学技术与工程 ›› 2025, Vol. 25 ›› Issue (36) :15506-15515
原油和润湿反转化学剂影响下的可溶镁合金溶解速率
Impact of Crude Oil on Dissolution Rate of Dissoluble Magnesium Alloy and Its Mitigation Method with Wettability-alteration Surfactants
受润湿反转化学剂对储层基质附着油膜剥离作用的启示,开展全溶桥塞所用的高强度与高延展镁合金材料在原油和润湿反转化学剂影响下的溶解实验,探究不同黏度原油吸附作用对合金材料降解速率的影响规律,以及合金在原油和润湿反转化学剂双重作用下的降解速率恢复规律。实验结果表明:黏度越大的原油对合金溶解速率的影响越大;地层流体中Cl-浓度越大,合金溶解反应越剧烈,产生的氢气越多,合金溶解越快;化学剂本身不会影响金属溶解速率,但其可使合金表面发生润湿反转现象;浓度为1%的化学剂使合金在7 min内从亲油转变为亲水,在3 h内使合金表面原油解吸附,进而使合金恢复正常溶解速率,同时抑制合金表面再次形成油膜,保证合金的正常溶解;溶液内化学剂浓度越高,润湿反转所用时间就越短,合金恢复正常溶解速度所需时间也越短。可见,润湿反转化学剂协同氢气气泡的双重作用机制,在剥离合金表面油膜,持续抑制油膜生成,保证桥塞顺利溶解方面有显著作用,比对桥塞合金进行涂层或者表面处理更加经济,更加便捷。
The influence of wettability reversal chemical agents on oil film detachment from reservoir matrix was investigated through dissolution experiments conducted on high-strength and high-ductility magnesium alloys used in fully soluble bridge plugs. The degradation rate variation patterns of alloy materials under crude oil adsorption with different viscosities were systematically examined, along with the degradation rate recovery mechanism under the combined effects of crude oil and wettability reversal chemical agents. Experimental results reveal that higher viscosity crude oil exhibits more significant impacts on alloy dissolution rates. Elevated Cl- concentration in formation fluid is observed to intensify alloy dissolution reactions, accompanied by increased hydrogen gas production and accelerated degradation. Although the chemical agent itself shows no direct influence on metal dissolution rate, it is demonstrated to induce wettability reversal on alloy surfaces. A 1% concentration chemical solution achieves oil-wet to water-wet transition within 7 minutes and complete crude oil desorption from alloy surfaces within 3 hours, thereby restoring normal dissolution rates while effectively inhibiting oil film reformation. Higher chemical concentrations are found to shorten both wettability reversal duration and dissolution rate recovery time. The synergistic mechanism combining wettability reversal chemical agents with hydrogen bubble effects proves effective in continuously removing and suppressing oil film formation on alloy surfaces, ensuring reliable bridge plug dissolution. This methodology presents distinct economic and operational advantages compared to traditional coating or surface treatment approaches for bridge plug alloys.
可溶桥塞 / 润湿反转 / 可溶合金 / 稀释微乳液 / 压裂
dissolvable plug / wettability alteration / dissoluble alloy / diluted microemulsion / fracture
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