南海稠油油田热水驱硫化氢抑制技术研究

Study on Hydrogen Sulfide Suppression Technology of Hot Water Flooding in South China Sea Heavy Oil Field

南海东部A稠油油田地热水驱过程中出现了硫化氢气体,给生产带来巨大安全隐患,亟需探究合适的硫化氢抑制剂。市面上的抑制剂以醇胺类和三嗪类为主,与A油田高钙镁地层水环境不配伍且耐温性差,因此针对此情况开展了耐温耐盐型硫化氢抑制剂的优选评价,并探究了不同质量浓度抑制剂对硫化氢生成的抑制效果和对储层的伤害率。结果表明:硫化氢抑制剂1^(#)和2^(#)与地层水均具有较好的配伍性,其中2^(#)抑制效果较好,抑制剂用量为250mg·L^(-1)时H_(2)S抑制效果达85%以上,较同质量浓度1^(#)抑制剂效果优15%。抑制剂在250~2000 mg·L^(-1)注入质量浓度下,1^(#)和2^(#)抑制剂对岩心的渗透率保留率均可维持在97%以上。

Hydrogen sulfide gas appears in the process of geothermal water flooding in heavy oil field A in the east of South China Sea,which brings great safety hazard to production.It is urgent to explore suitable hydrogen sulfide inhibitors.The main inhibitors on the market are alkylamines and triazines,which are not compatible with the high calcium and magnesium formation water environment of oil field A and have poor temperature resistance.Therefore,the research and performance evaluation experiment of new temperature-resistant and salt-resistant hydrogen sulfide inhibitors were carried out,and the inhibitory effect of different mass concentrations of inhibitors on hydrogen sulfide generation and reservoir damage rate were explored.The results showed that the two new inhibitors had good compatibility with formation water,and the inhibition effect of 2^(#) was good,reaching 85%at 250 mg·L^(-1),15%better than that of 1^(#) inhibitor at the same mass concentration.Under the injection mass concentration of 250~2000 mg·L^(-1),the permeability retention rates of 1^(#) and 2^(#) inhibitors were maintained above 97%.