摘要
为了解决鄂尔多斯盆地东胜气田多口含长碳链凝析油的气井泡沫排水采气(以下简称泡排)效果差、频繁积液的问题,借助于室内评价实验开展了对长碳链凝析油的泡排效果主控因素分析,研发了双子两性抗油泡排剂,并且在现场10口井进行了应用试验。研究结果表明:①凝析油颜色越深,长碳链(C_(10)^(+))组分含量越高,对泡排效果影响越大,常规泡排剂在黑色凝析油中的起泡力降为0mm;②影响含油气井泡排效果的主要因素为所产凝析油中的长碳链组分及其含量;③针对该气田产出凝析油、地层水的特征,优选以CH14和CH18混合碳链(摩尔比为8.5∶1.5)为主剂,辅以凝析油乳化剂提升泡排体系乳化能力,引入氟碳活性剂以降低泡沫表面张力,研发形成了双子两性抗长碳链凝析油泡排剂,室内评价实验结果表明该泡排剂针对不同含油水样的携液率均大于80%;④10口井的现场应用试验结果表明,该新型泡排剂有效率为90%,单井平均增产20%,取得了良好的应用效果。结论认为,该新型泡排剂有效解决了含长碳链凝析油的气井使用常规泡排剂采气效果差的问题,为东胜气田稳产提供了技术保障,可以作为同类含油气井泡排工艺体系完善的参考依据。
In order to address the issues of poor performance of foam drainage gas recovery(hereinafter referred to as foam drainage)and frequent liquid loading in multiple gas wells with long-carbon-chain condensate of the Dongsheng gas field in the Ordos Basin,laboratory evaluation experiments were conducted to analyze the main factors controlling the foam drainage effect,and gemini amphoteric oil-resistance foam drainage agent was developed and applied in 10 wells for testing.The following results are obtained.(i)The darker the color of condensate,the higher the content of long-carbon-chain(C_(10)^(+))components,and the greater the influence on the foam drainage.Conventional foam drainage agents lose all foaming ability in black condensate.(ii)The main factors influencing the foam drainage in oil-bearing gas wells are the long-carbon-chain components and their content in the produced condensate.(iii)Based on the characteristics of condensate and formation water produced in the gas field,a mixed carbon chain of CH14 and CH18(with molar ratio of 8.5:1.5)is selected as the main agent,supplemented with condensate emulsifier to improve the emulsifying capacity of foam drainage system and fluorocarbon surfactant to reduce foam surface tension,and thus a gemini amphoteric foam drainage agent resistant to long-carbon-chain condensate is developed.The laboratory evaluation experimental results suggest that this agent achieves the liquid-carrying rates>80%for various oil-bearing water samples.(iv)Field application tests on 10 wells show that this novel foam drainage agent achieves an effectiveness rate of 90%,with an average production increase of 20%per well.It is concluded that the novel agent effectively overcomes the poor gas recovery performance of conventional agents for wells with long-carbon-chain condensate,providing technical guarantee for stabilizing production of Dongsheng gas field.It can serve as a reference for improving the foam drainage process system of similar oil and gas wells.
作者
孔浩
罗懿
王锦昌
周瑞立
周舰
黄霞
KONG Hao;LUO Yi;WANG Jinchang;ZHOU Ruili;ZHOU Jian;HUANG Xia(Petroleum Engineering Technology Research Institute,Sinopec North China Oil and Gas Company,Zhengzhou,Henan 450006 China;Sinopec Key Laboratory of Deep Coalbed Methane Exploration and Development,Zhengzhou,Henan 450006,China)
出处
《天然气勘探与开发》
2025年第5期112-122,共11页
Natural Gas Exploration and Development
基金
中国石油化工集团有限公司科研项目“致密含水气藏采输关键技术及应用”(编号:P23162)。
关键词
凝析油
长碳链组分
双子两性
泡排剂
鄂尔多斯盆地东胜气田
排水采气
携液率
抗油性
Condensate
Long-carbon-chain components
Gemini amphoteric
Foam drainage agent
Dongsheng gas field in the Ordos Basin
Drainage gas recovery
Liquid carrying rate
Oil resistance
