高含凝析油气井泡沫排液用起泡剂研究

Research of Foam Frother for High Content of Condensate Oil-Gas Well

针对高合凝析油气井泡沫排液困难，以长链烷基二甲基叔胺为主要原料、双氧水为氧化剂，合成了一种长链烷基氧化胺OA，引入少量与其有协同增效作用的磺酸盐类表面活性剂，形成抗凝析油起泡剂主剂zJ。再与多种稳定泡沫物质复配，得到一种高抗凝析油的复配起泡剂，配方为：2％ZJ＋0．04％NaOH＋0．03％瓜尔胶。zJ在高凝析油条件下（50％-70％）的泡沫排液性能明显优于常用起泡剂uT_11c。70℃下，凝析油含量为70％时，zJ的起泡能力（初始泡沫高度）为13．7cm，泡沫稳定性（3min后的泡沫高度）为9．8cm，携液能力为12mL／15rain。复配后的起泡能力为15．4cm，泡沫稳定性为11．8cnl，携液能力为60mL／15min。抗温可达90℃，抗盐可达8％。在川渝地区五宝场凝析气藏两口高含凝析油（大于50％）积液气井中成功运用，使两口间歇生产井恢复了连续生产，产气量提高约40％。

According to the foam drainage difficulty for condensate oil-gas well, a kind of long chain alkyl amine oxide OA was synthesized using a long chain alkyl dimethyl tertiary amines as the main raw material and hydrogen peroxide as oxidant. Anticoagulant condensate oil frother main agent ZJ was obtained which introduced a small amount sulfonic acid salts surfactant with synergistic effect. It was compounded with stable foam agent to form a high anticoagulant compound foaming agent. The formula was obtained as follows： 2% ZJ, 0.04% NaOH, 0.03% guar gum. Under the condition of high condensate oil （50%--70%）, the foam drainage performance of ZJ was superior to that of common foaming agent UT-11c. When the content of condensate oil was 70% at 70℃, the foaming capacity （initial foam height） of ZJ was 13.7 cm, foam stability （foam height after 3 min） was 9.8 cm, and liquid carrying capacity was 12 mL/15 min. The three data changed to 15.4 cm, 17.8 cm and 60 mL/15 min respectively after compounding. The resistance temperature was 90℃, and salt resisting mass fraction was 8%. This compound foaming agent was successfully applied in two effusion wells with high content of condensate oil （above 50% ） of gas condensate in Wubaochang possession. Two intermittent production wells returned to continuous production, and the gas production increased about 40%.