气田采出水处理关键技术研究  

Research on key technologies for treating produced water of gasfield

作　　者：蔺嘉昊 李曙华 蒋成银[1] 徐广军 吴磊[1] 王宁[1] 杨海波[1] 王嘉彦[1] LIN Jiahao;LI Shuhua;JIANG Chengyin;XU Guangjun;WU Lei;WANG Ning;YANG Haibo;WANG Jiayan(Gas Production Plant 3 of PetroChina Changqing Oilfield Company,Wushenqi Neimenggu 017300,China;Gasfield Development Division of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710000,China;School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710000,China)

机构地区：[1]中国石油长庆油田分公司第三采气厂,内蒙古乌审旗017300 [2]中国石油长庆油田分公司气田开发事业部,陕西西安710000 [3]西安石油大学地球科学与工程学院,陕西西安710000

出　　处：《石油化工应用》2024年第2期49-53,共5页Petrochemical Industry Application

摘　　要：气田采出水存在产出量大、水质复杂、乳化严重等问题,同时气区集气站分布广、距离远,采出水的运输和处理难度较大。为进一步提升采出水运输效率、优化水质指标,强化除油效果,挖掘轻烃增产潜力,全面推行“拉运-管输”工艺改造,优选液压单缸双作用柱塞泵保障输送效率,攻关形成了“破乳+油水分离+气浮+旋流分离”水处理工艺,同时开展油水混输及药剂配伍效果试验,评价工艺运行效果。研究表明:(1)在采出水管输工艺改造基础上,采用集气站-处理厂油水混输模式,可有效提高生产效率,减轻员工劳动强度,降低生产运行成本;(2)采用油水混输,经过“前端破乳+油水分离”工艺处理,可强化油分分离效果,产油率较单一的大罐沉降处理模式提升4.73%;(3)结合“破乳+油水分离+气浮+旋流分离”工艺,按照水处理量60 m^(3)/h,确定了最佳加药类型7种、加药顺序、加药数量等影响水处理效果的关键因素,处理后水质悬浮物去除率为64%,油分去除率为92%。The produced water from the gasfield has problems such as high output,complex water quality and severe emulsification.At the same time,the gas gathering stations in the gas area are widely distributed and far away,making it difficult to transport and treat the produced water.In order to further improve the transportation efficiency of produced water,optimize water quality indicators,strengthen the oil removal effect,and explore the potential for increasing light hydrocarbon production,we have comprehensively implemented the"transportation pipeline transportation"process transformation,optimized the hydraulic single cylinder double acting plunger pump to ensure transportation efficiency,and formed the"demulsification+oil-water separation+air flotation+cyclone separation"water treatment process.At the same time,we have conducted experiments on the mixed transportation of oil and water and the compatibility of chemicals to evaluate the operational effect of the process.Research has shown that,(1)Based on the transformation of the production water pipeline transportation process,adopting the gas gathering station treatment plant oil-water mixed transportation mode can effectively improve production efficiency,reduce employee labor intensity,and reduce production and operation costs.(2)Adopting oil-water mixed transportation and undergoing the"front-end demulsification+oil-water separation"process,the oil separation effect can be strengthened,and the oil production rate is increased by 4.73%compared to the single large tank sedimentation treatment mode.(3)By combining the process of"de-mulsification+oil-water separation+air flotation+cyclone separation"and considering the water treatment capacity of 60 m^(3)/h,key factors affecting the water treatment effect,such as seven optimal dosage type,dosage sequence and dosage quantity,were determined.After treatment,the removal rate of suspended solids in water quality was 64%,and the removal rate of oil was 92%.

关 键 词：气田 采出水 管道输送 破乳 气浮 旋流分离 加药 

分 类 号：TE39[石油与天然气工程—油气田开发工程]