油田三元复合驱废液处理技术研究与试验  

Research Progress of Treatment Technology for Coalbed Methane Produced Water

作　　者：李延隆 陈曦 杨磊 王昊[4] 王洪涛[4] 张建华 李颖 Li Yanlong;Chen Xi;Yang Lei;Wang Hao;Wang Hongtao;Zhang Jianhua;Li Ying(CNPC Research Institute of Safety&Environment Technology;CNPC Bohai Petroleum Equipment Manufacturing Company;PetroChina Liaohe Petrochemical Company;No.2 Oil Production Plant of PetroChina Daqing Oilfield)

机构地区：[1]中国石油集团安全环保技术研究院有限公司,北京市102206 [2]中国石油集团渤海石油装备制造有限公司 [3]中国石油天然气股份有限公司辽河石化分公司 [4]大庆油田第二采油厂

出　　处：《油气田环境保护》2024年第6期35-41,共7页Environmental Protection of Oil & Gas Fields

基　　金：集团公司重大科技专项绿色油气田污染防治及生态保护研究课题4“含聚含油废液强制破胶与回用工程技术研究”(2021DJ6604);中国石油集团安全环保技术研究院有限公司科学研究与技术开发项目“油气田综合作业废液一体化处理装置结构升级及现场验证”(RISE2023KY07)。

摘　　要：国内部分油田已进入中后期开采阶段,为提高采收率使用的三元复合驱采油工艺会产生大量的三元复合驱废液。三元复合驱废液水质情况复杂、黏度高、乳化严重,处理难度大。文章通过对三元复合驱废液水质特征进行系统分析,开展破胶降黏,去除石油类和悬浮固体的技术研究,提出了以“破胶混凝+离心分离+气浮+过滤”为主体的三元复合驱废液处理工艺,通过现场中试验证其工艺可实现废液的快速破胶并有效减少出水的含油量和悬浮固体。结果表明,经过此工艺处理,废液破胶时间可缩短至60 s以内,石油类和悬浮固体去除效率分别可达95.22%和97.68%,出水满足SY/T 5329—2022《碎屑岩油藏注水水质指标技术要求及分析方法》中Ⅱ级水质标准要求。As domestic oil demand continues to increase,several domestic oil fields have entered the midto-late stages of extraction.To enhance oil recovery,the use of the ternary composite drive method is inevitable,which consequently generates a substantial volume of ternary composite drive wastewater.This wastewater is characterized by complex water quality,high viscosity,and severe emulsification,making its treatment challenging.This study systematically analyzes the water quality characteristics of the ternary composite drive wastewater,the water quality of ternary composite flooding wastewater is complex,with high viscosity and severe emulsification,making it difficult to treat.This article systematically analyzes the water quality characteristics of ternary composite flooding waste liquid,and conducts technical research on gel breaking,viscosity reduction,removal of oil content and suspended solids.A ternary composite flooding waste liquid treatment process with“gel breaking coagulation+centrifugal separation+air flotation+filtration”as the main body has been proposed.Through on-site experiments,it has been proven that the rapid gel breaking of waste liquid can be achieved and the oil containing pollutants and suspended solids in the effluent can be effectively reduced.The results indicate that the demulsification time can be reduced to 60 seconds,with removal efficiencies for oil-based pollutants and suspended solids reaching 95.22%and 97.68%,respectively.The treated water meets the LevelⅡwater quality standards specified in SY/T 5329—2022“Technical Requirements and Analytical Methods for Water Quality Indices for Injection in Clastic Rock Oil Reservoirs”.

关 键 词：三元复合驱废液 高含聚含油 破胶降黏 

分 类 号：X703.1[环境科学与工程—环境工程]