大井距水平井氮气泡沫调驱参数优化与应用  

Application and optimization of nitrogen foam profile control parameters for offshore well spacing horizontal well pattern

作　　者：孙艳妮 李胜胜 冯青 SUN Yanni;LI Shengsheng;FENG Qing(COSL Production Optimization Division,Tianjin 300459,China;Guangdong Nanyou Service Co.,Ltd.,Tianjin Branch,Tianjin 300450,China)

机构地区：[1]中海油服油田生产事业部,天津300459 [2]广东南油服务有限公司天津分公司,天津300450

出　　处：《石油化工应用》2022年第2期44-47,共4页Petrochemical Industry Application

摘　　要：海上B油田为高孔高渗油藏,采用大井距水平井网开发,井距范围625~917 m,目前综合含水达到78.8%。为了封堵优势渗流通道,改善B油田水平井水驱开发效果,开展了水平井氮气泡沫调驱研究。利用CMG软件对B油田氮气泡沫调驱注采参数进行优选,研究结果表明,采用段塞注入方式、注入量20400 m^(3)、氮气注入速度1500 m^(3)/h、气液比1:1、段塞大小5 d、起泡剂浓度0.5wt.%、段塞时间间隔为1~2 d时开发效果较好。从实际效果看,调驱后B油田I1H井组递减趋势得到明显减缓,由措施前的9.1%下降到措施后的1.5%,目前井组累积增油量为3.40×10^(4)m^(3)。受效单井最大日增油量78.4 m^(3),最大含水率下降9.8%,能够达到降水增油和提高原油采收率的目的,为海上油田大井距水平井的高效开发提供借鉴。Offshore oilfield B is a high porosity and high permeability reservoir,which is developed by horizontal well pattern with large well spacing.The well spacing range is 625~917 m,and the comprehensive water cut is 78.8%.In order to block the dominant seepage channel and improve the water flooding development effect of horizontal wells in B oilfield,nitrogen foam flooding in horizontal wells has been carried out.CMG software is used to optimize the injection and production parameters of nitrogen foam flooding in B oilfield.The results show that the slug injection mode,injection volume 20400 m^(3),nitrogen injection rate 1500 m^(3)/h,gas-liquid ratio 1:1,slug size 5 d,foaming agent concentration 0.5wt.%and slug time interval 1~2 d have better development effect.From the actual effect,the decline trend of I1H well group in B oilfield has been significantly slowed down after profile control and flooding,from 9.1%before the measures to 1.5%after the measures.At present,the cumulative oil increase of the well group is 3.40×10^(4)m^(3).The maximum daily oil production of the affected single well is 78.4 m^(3),and the maximum water cut is reduced by 9.8%,which can achieve the purpose of increasing oil production,dewatering and enhancing oil recovery,and provide reference for the efficient development of large spacing horizontal wells in offshore oilfield.

关 键 词：大井距水平井 氮气泡沫调驱 油藏数值模拟 注采参数优选 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]