海上河流相稠油油田低产低效井综合治理措施分析——以N油田09砂体为例

Analysis of comprehensive treatment measures for low production and low efficiency wells in offshore fluvial heavy oilfield--by taking sand body 09 of N oilfield as an example

随着河流相稠油油田开发进入中后期,受原油黏度大、储层非均质性强、油水系统复杂等制约,低产低效井井数占比逐年增加。为了改善海上油田开发效果和实现降本增效,以N油田09砂体为例,开展海上河流相稠油油田低产低效井综合治理措施分析。结果表明,09砂体低产低效井成因可细分为储层物性差、采出程度高和工艺出砂三种类型;影响低产低效井综合治理措施的因素除了成因外,还有剩余油分布、井型、油柱高度、水平段长度等因素;在综合各因素的基础上,针对09砂体每一类低产低效井提出了相应的治理措施。其研究成果应用于N油田低产低效井的综合治理,增加产能400 m3/d,提高采收率约0.2%,取得了较好的开发效果。

With the development of fluvial heavy oil field entering the middle and late stage,the proportion of low production and low efficiency wells is increasing year by year due to the restriction of high crude oil viscosity,strong reservoir heterogeneity and complex oil-water system.In order to improve the development effect of offshore oilfield and realize cost reduction and efficiency increase,the comprehensive treatment measures of low production and low efficiency wells in offshore fluvial heavy oil field are analyzed by taking sand body 09 of N oilfield as an example.The results show that the causes of low production and low efficiency wells in sand body 09 can be divided into three types:poor reservoir physical properties,high recovery degree and technological sand production.In addition to the cause of formation,the factors influencing the comprehensive treatment measures of low production and low efficiency wells include the distribution of remaining oil,well type,oil column height,horizontal section length,etc.On the basis of comprehensive factors,the corresponding control measures are put forward for each type of low production and low efficiency wells in sand body 09.The results have been applied to guide the comprehensive treatment of low production and low efficiency wells in N oilfield.The productivity is increased by 400 m3/d,the recovery factor is about 0.2%,and good development effect has been achieved.