缓慢释放型起泡剂的研究与应用

Research and Application of Slow-Released Foaming Agent

针对普通起泡剂在井筒中溶解迅速、发泡时间短、泡沫排水采气效果差的难题,开展了缓慢释放型起泡剂的研究,考察了温度、矿化度、甲醇、凝析油对起泡剂的影响。结果表明,温度从60℃升至100℃,起泡剂起泡高度和携液率分别从120 mm和77%降至105 mm和56%;矿化度由0增至250 g/L,起泡高度和携液率分别从130 mm和71%降至90 mm和48%;甲醇体积分数由0增至40%,起泡高度和携液率分别从140 mm和85%降至70 mm和78%;凝析油体积分数由0增至40%,起泡高度和携液率分别从140 mm和85%降至120 mm和76.3%。该起泡剂耐温90℃、抗矿化度150 g/L、抗甲醇30%、抗凝析油30%,完全满足苏里格气田低压低产气井的排水采气需求。2012~2013年开展了5口井现场试验,平均油套压差降低1.3 MPa,平均产气量增加0.07×104m3/d。

Ordinary foaming agent had the characteristics of short dissolving and foaming time,so the effect of foam drainage gas recovery was poor. In order to solve this problem,slow-released foaming agent was studied. The effect of temperature,salinity,methanol and condensate oil on the foaming agent was investigated. The results showed that the foaming height decreased from 120 mm to 105 mm,and the liquid carrying rate changed from 77% to 56% when temperature increased from 60℃ to 100℃. The foaming height decreased from 130 mm to 90 mm,and the liquid carrying rate changed from 71% to 48% when the salinity increased from 0 to 250 g/L. The foaming height reduced from 140 mm to 70 mm,and the liquid carrying rate decreased from 85% to 78% when the volume fraction of methanol increased from 0 to 40%. The foaming height reduced from 140 mm to 120 mm,and the liquid carrying rate decreased from 85% to 76.3% when the volume fraction of condensate oil increased from 0 to 40%. In general,the foaming agent could be used under the condition of 90℃ temperature,150 g/L salinity resistance,30% methanol and30% condensate oil,which fully met the needs of drainage gas recovery for low pressure and low production gas wells in Sulige gas field. The slow-released foaming agent was applied in 5 gas wells on site during 2012—2013. The average pressure difference for oil and casing reduced 1.3 MPa,and gas production in average increased by 0.07×104m3/d.