耐高含量凝析油泡排剂的研制及现场应用

Research and field Application of High Content of Condensate Oil Resistance foam Unloading Agent

武俊文 张汝生 王海波 岑学齐 贾文峰 肖在馨

WU Junwen ZHANG Rusheng WANG Haibo CEN Xueqi JIA Wenfeng Xiao Zaixin

针对龙凤山气区出水气井普遍具有井较深（＞3000 m）、气层温度较高（104~149℃）、部分区块凝析油含量特高（10%~60%）的特点，研制了一种有机铵盐型阳离子氟碳表面活性剂，将氟碳表面活性剂与实验室自制起泡剂（月桂酰胺丙基甜菜碱与α-烯基磺酸钠的质量比为10∶1）按质量比1∶15混合，得到耐高含量凝析油的泡排剂PQ-Y，考察了该泡排剂在高凝析油含量下的起泡力、稳泡力和携液能力及耐温耐盐性能，并进行了现场应用。研究结果表明，该泡排剂在160℃老化14 h后的初始起泡高度H0和5 min后泡沫高度H5仍分别高达194 mm和186 mm，在矿化度高达250000 mg/L时其H0和H5仍分别高达189 mm和180 mm，在50%石油醚含量下初始起泡高度H0和5min后泡沫高度H5分别高达171 mm和168 mm，携液速率达8 mL/min，证明其有较强的抗凝析油能力。在龙凤山北201-XY井现场试验中，平均产气量由7256 m3/d提高到11329 m3/d，提高幅度达56%；平均油套压差由2.66 MPa下降到2.38 MPa，下降10.5%；携液增产效果明显。该泡排剂可满足凝析油含量较高气区排水采气需求。图3表5参12

Longfengshan gas field water well is characteristic of deep well depth，high gas temperature（104—149℃）and super high content of condensate oil for some blocks. A kind of organic ammonium salt type cationic fluorocarbon surfactant was synthesized，and it was mixed with the existing foaming agent as a ratio of 1∶15，which was composed of zwitterionic surfactant cocoamidopropylbetaine and sodium alpha-olefin sulfonate at ratio of 10∶1，thus the foam unloading agent PQ-Y was developed. Its foaming ability，foam stabilizing ability and liquid carrying ability were tested and field test was also carried. Laboratory tests showed that the initial foaming height Ho and foam height after 5 min H5 of the foam unloading agent were 194 mm and 186 mm，respectively，after aging at 160℃ for 14 h，and Ho and H5 were 189 mm and 180 mm when the salinity was as high as 250000 mg/L，and Ho and H5 were 171 mm and 168 mm，respectively，when the volume fracion of petroleum ether was 50%，its liquid carrying rate was as high as 8 mL/min，which indicated that the foam unloading agent PQ-Y was resistant to the condensate oil. The field test of the foam unloading agent in Longfengshan north 201-XY well showed that，the average gas production increased from 7256 m3/day to 11329 m3/day，increasing by 56%，the average differential pressure between tubing and casing dropped from 2.66 MPa to 2.38 MPa，felling by 10.5%，both liquid yield and gas production were obvious，which proved that the foam unloading agent PQ-Y could meet the demand of drainage gas recovery for high content condensate oil gas field

10.19346/j.cnki.1000-4092.2019.03.023