CAJ | 학술논문

针对国外W油田异常高压和烃气产出量不足的特点，研究了N2、CH4、CO2和烟道气等四种气体对烃气混相驱油效果的影响．利用基于混合单元网格法编制的软件，得出了四种气体与烃气驱最小混相压力的相互关系；在PV T 数据拟合的基础上，运用数值模拟软件模拟注气膨胀试验得到了分别加入四种气体的烃气与原油物性的关系；在国外W油田地质模型和井组的基础上优化研究了不同注入气比例对采出程度和累计注入气量的影响．结果表明，N2、C H4和烟道气等三种气体都能不同程度地增大原油的烃气驱最小混相压力，且N2对最小混相压力的影响最大，CO2能够使得原油的最小混相压力发生微弱地降低；在储层原始压力77．59 M Pa下，分别加入了四种气体的烃气都能使得原油体积膨胀系数和原油饱和压力上升，而原油的密度和粘度降低，其中N2的降粘效果和使原油膨胀的能力最强；运用数值模拟优化研究得到最优加入气为烟道气，其相应的最佳注入气比例为1．2．
침대국외W유전이상고압화경기산출량불족적특점，연구료N2、CH4、CO2화연도기등사충기체대경기혼상구유효과적영향．이용기우혼합단원망격법편제적연건，득출료사충기체여경기구최소혼상압력적상호관계；재PV T 수거의합적기출상，운용수치모의연건모의주기팽창시험득도료분별가입사충기체적경기여원유물성적관계；재국외W유전지질모형화정조적기출상우화연구료불동주입기비례대채출정도화루계주입기량적영향．결과표명，N2、C H4화연도기등삼충기체도능불동정도지증대원유적경기구최소혼상압력，차N2대최소혼상압력적영향최대，CO2능구사득원유적최소혼상압력발생미약지강저；재저층원시압력77．59 M Pa하，분별가입료사충기체적경기도능사득원유체적팽창계수화원유포화압력상승，이원유적밀도화점도강저，기중N2적강점효과화사원유팽창적능력최강；운용수치모의우화연구득도최우가입기위연도기，기상응적최가주입기비례위1．2．
The foreign W oilfield is an abnormal high pressure reservoir ,and its gas production is insufficient .In this paper ,we study the effects of the four kinds of gases ,including N2 , CH4 ,CO2 ,and flue gases ,on hydrocarbon miscible displacements .The software based on multiple mixing‐cell method is used to calculate the MMP (minimum miscible pressure) and the relationship between make‐up gas and MMP is obtained .Base on PVT data ,eclipse is used to simulate the gas‐injection expansion experiment to analyze the effects of different ga‐ses on hydrocarbon miscible displacements .Optimization is conducted to get the effects of hydrocarbon injected rate to the recovery rate and cumulative injection volume .The results show that the N2 ,CH4 and flue gases can increase the MMP of hydrocarbon displacement , and the N2 has the greatest impact on MMP ,and CO2 can make the MMP decreases .Under the initial reservoir pressure 77 .59 MPa ,the hydrocarbon gas compounded with different ga‐ses can make the oil volume and saturation pressure increase .They also can make the oil den‐sity and the viscosity decrease .Further ,N2 has the best ability to reduce oil viscosity and make the volume of crude oil expand .It is also found that flue gas is the best additive gas and the optimal injection rate is 1 .2 .