边底水稠油油藏微生物氮气复合吞吐工艺  

Microbial Nitrogen Composite Stimulation Process of Heavy Oil Reservoir with Edge/Bottom Water

作　　者：张吉星 宋欣 林军章 刘涛 ZHANG Ji-xing;SONG Xin;LIN Jun-zhang;LIU Tao(SINOPEC Research Institute of Petroleum Engineering Co.,Ltd,Shengli Oilfield,Dongying Shandong 257001,China)

机构地区：[1]中石化胜利油田石油工程技术研究院,山东东营257001

出　　处：《化肥设计》2024年第3期58-60,共3页Chemical Fertilizer Design

摘　　要：由于原油黏度高,边底水稠油油藏油水流度比大,单井含水上升快,导致该类油藏采出程度低。探索边底水油藏微生物复合氮气吞吐工艺,扩大微生物的作用半径,提高微生物与剩余油接触和动用效率,从而实现单井产量提高。首先建立乳化降黏和润湿洗油的微生物复合吞吐体系,0.3%复合体系表面张力为27.5 mN/m,洗油效率为91.3%,原油降黏率达83.7%;该体系与氮气复合后具有一定的泡沫性能。利用一维物理模拟实验优化微生物体系与氮气复合注入工艺,气液比为2,注入浓度为0.3%,焖井周期为10 d;采用微生物氮气复合吞吐工艺在弱边底水油藏现场试验了6口井,平均含水降低10%以上,增油达8494 t,取得了良好的矿场试验效果。Due to its high viscosity,heavy oil reservoirs with edge/bottom water often have a low recovery ratio due to its high oil-to-water flow ratio and rapidly rising water cut of single wells.By exploring the microbial composite nitrogen stimulation process in heavy oil reservoirs with edge/bottom water,it aims to expand the working radius of microorganisms and improve their contact and efficiency with residual oil,so as to increase single-well production.First of all,a microbial composite stimulation system of hydrophilic emulsification viscosity reduction and wetting oil washing system is set up,with a 27.5mN/m surface tension on the 0.3%composite system,91.3%oil washing efficiency,and 83.7%viscosity reduction rate of crude oil.This system has certain foaming property when in composite with nitrogen.The composite injection process of nitrogen into microbial system is optimized through a one-dimensional physical simulation experiment,with the gas-liquid ratio at 2,the injection concentration at 0.3%,and the period of well stewing for 10 days.After testing the microbial nitrogen composite stimulation process on six wells in a weak edge/bottom water reservoir,it's found that the average water content is reduced by over 10%,and oil output goes up by 8,494t,achieving sound field testing effects.

关 键 词：边底水 稠油 微生物 氮气 吞吐工艺 

分 类 号：TE345[石油与天然气工程—油气田开发工程]