摘要
随着海上油气田的滚动开发,低渗油气田逐渐成为开发主力,其通常采用注水开发的方式,以提高采收率和开采效益,但受地层物性影响,对注水水质要求不断提高,传统生产水处理工艺无法满足需求。在传统生产水处理工艺基础之上,通过引进改性PVDF超滤技术,开展超滤膜组清洗恢复通量研究,优选超滤膜组压差作为清洗响应的表征量,形成了一套完整的A2级生产水深度处理工艺体系。该技术在南海某海上低渗油气田进行现场试验,经改性PVDF超滤膜处理后的水质满足污水含油浓度≤6 mg/L、悬浮物质量浓度≤2 mg/L、粒径中值≤1.5μm的A2级水质要求,并可实现A2级生产水产水率高达85%以上,改性PVDF超滤膜组运行时效高达92%以上,满足现场注水开发需求,对其他海上油气田具有借鉴价值。
With the rolling development of offshore oil and gas fields,low permeability oil and gas fields have gradually become the main force of development,which always adopt water injection to improve oil recovery and development benefits.However,due to the influence of formation physical properties,the requirements for the quality of water injection are constantly improving,and the traditional production water treatment process cannot meet the demands.So,on the basis of the traditional production water treatment process,by introducing the modified PVDF ultrafiltration technology,the recovery of flux of ultrafiltration membrane group by cleaning is studied,and the ultrafiltration membrane group pressure difference is selected as the characterization of cleaning response,forming a complete A2 grade production water advanced treatment process system.The field test of this technology in an offshore low permeability oil and gas field in the South China Sea shows that the quality of water treated by modified PVDF ultrafiltration membrane meets the following requirements:oil content≤6 mg/L,suspended solids content≤2 mg/L,median particle size≤1.5μm,and the production rate of A2 grade production water can reach more than 85%,and the efficient run time of the modified PVDF ultrafiltration membrane group can reach more than 92%,which can meet the needs of field water injection development,and has reference value for other offshore oil and gas fields.
作者
李振宇
LI Zhenyu(Zhanjiang Branch,CNOOC)
出处
《油气田地面工程》
2022年第3期34-37,共4页
Oil-Gas Field Surface Engineering
关键词
低渗油气田
注水开发
改性PVDF超滤技术
A2级生产水
深度处理技术
low permeability oil and gas fields
water injection development
modified PVDF ultrafiltration technology
A2 grade production water
advanced treatment technology
