海上油田大处理量井下油水分离技术研究及应用  

Research and application of downhole oil-water separation technology with large processing capacity in offshore oilfield

作　　者：王胜 刘敏 段铮 万钧 郭沛文 王瑶 马喜超 史仕荧[4] WANG Sheng;LIU Min;DUAN Zheng;WAN Jun;GUO Peiwen;WANG Yao;MA Xichao;SHI Shiying(National Key Laboratory of Offshore Oil and Gas Exploitation,Beijing 102209,China;CNOOC EnerTech-Drilling&Production Co.,Tianjin 300452,China;CNOOC China Limited,Shenzhen Branch,Shenzhen,Guangdong 518067,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]海洋油气高效开发全国重点实验室,北京102209 [2]中海油能源发展股份有限公司工程技术分公司,天津300452 [3]中海石油(中国)有限公司深圳分公司,广东深圳518067 [4]中国科学院力学研究所,北京100190

出　　处：《中国海上油气》2023年第5期164-170,共7页China Offshore Oil and Gas

基　　金：中国海洋石油集团有限公司“十三五”科技重大项目“海上高效采油新技术-井下油水分离技术产业化应用研究(编号:CNOOC-KJ 135KJXM NFGJ 2017-01)”部分研究成果。

摘　　要：海上油田部分生产井产液量大、含水高,导致平台水处理压力大、海管外输容量受限等问题,影响到油田提液稳产。针对油田减少产出水的需求开发了单级大排量管式井下油水分离器,以海上油田H井为例,开展了管式油水分离器油水分离性能的室内实验研究,并采用Fluent软件以数值模拟方法分析了管式井下分离器入口含油率、分流比和入口流量对分离性能的影响;结合H井注采参数设计要求,确定目标井的管式井下油水分离器结构参数,并设计与井况相适应的“采下注上”的罐装泵式工艺管柱,以解决海上油田大处理量工况需求。研究表明,管式井下油水分离器可实现高效油水分离,分离出的水中含油率低于950 mg/L;罐装泵工艺结构紧凑、功能完善,能满足海上油田大处理量需求;现场试验中井下处理量最高达到2000 m^(3)/d,并可将高含水油井产液中60%以上的含水直接在井下分离并回注,高峰期日减少产出水超1200 m^(3)/d。本项研究可为油水旋流分离技术在海上油田的应用及实践提供借鉴。The large fluid production and high water cut of some production wells in offshore oilfields have led to problems such as high pressure on the platform water treatment and limited export capacity of the submarine pipelines,which have affected the stable oil extraction.A single-stage high-capacity tubular downhole oil-water separator has been developed to meet the demand for reducing produced water in oilfields.Taking the Well H in an offshore oilfield as an example,laboratory experiments were conducted to study the oil-water separation performance of tubular oil-water separators.The influence of oil content,flow split ratio,and inlet flow rate on separation performance was analyzed using numerical simulation method with Fluent software.Based on the design requirements for the injection and production parameters of Well H,the structural parameters of the tubular downhole oil-water separator for the target well were determined,and a“lower production and upper injection”canned pump-type process string adapted to the well conditions was designed to address the high-capacity processing requirements of offshore oilfields.Research has shown that the tubular downhole oil-water separator can achieve efficient oil-water separation,with the oil content in the separated water being less than 950 mg/L.The canned pump has a compact structure and complete functions,which can meet the large processing capacity requirements of offshore oilfields.In field tests,the maximum downhole treatment capacity reached 2000 m^(3)/d,and more than 60%of the water content in the high-water-cut oil well production fluid could be directly separated and re-injected downhole,reducing the daily output of produced water by more than 1200 m^(3)/d at peak periods.This study can provide a reference for the application and practice of oil-water cyclone separation technology in offshore oilfields.

关 键 词：海上油田 大处理量 管式 井下油水分离 采下注上 罐装工艺 

分 类 号：TE355[石油与天然气工程—油气田开发工程]