油藏数值模拟技术在复杂断块油藏开发后期的应用

Application of the reservoir numerical simulating technique in the later development stage of complex fault block oil and gas pool.

油藏数值模拟技术对于查明已开发油田的油藏潜力、措施制定、调整方案综合设计等有着不可替代的作用。针对河流相多油层复杂断块油藏开发后期的特点,通过油藏数值模拟技术研究确立了港东开发区复杂断块油藏剩余油分布特征,应用该技术进行了油井提液方案及影响因素研究。结果表明,当含水率相同、提液倍数相同、原油粘度不同时,随着原油粘度增大,提液效果变差;当原油粘度一定、含水率一定时,不考虑其他影响因素,累增产油量随提液倍数的增大而增大;当原油粘度一定、提液倍数相同时,含水率越低提液效果越好。正韵律提液累计增产油量高于反韵律提液累计增产油量;压力系数为低、中、高组合的油藏模型提液效果要好于压力系数为高、中、低组合的提液效果。应用该技术还进行了注采井网调整方法研究,从4种井网部署模式累计产油量计算结果看,主体带注水、边部采油模式好于边部注水、边部采油注采模式。该研究对于确定复杂断块油藏开发后期油藏潜力、确定合理的油井提液方案和合理部署注采井网具有一定的指导意义。

Reservoir numerical simulation is the technique that can play an irreplaceable role in getting a clear understanding of reservoir potential,reasonable allocation of measures and adjustment of integrated project design for developed fields.In accordance with the characteristics of the multi oil layers in fluvial facies of the later development of complex fault block oil and gas pool,through applying reservoir numerical simulation technique to study,the distributional characteristics of residual oil were set up for complex fault block oil and gas pool in Gangdong development zone,the study of liquid extract scale program of the oil wells and its influential factors were made with this technique,the results indicate that when the water cut is same,the liquid extract multiple is same and crude oil viscosity is different,the effect of liquid extract will become bad with the crude oil viscosity increasing,when crude oil viscosity and water cut are fixed,cumulative oil production will increase with increasing the liquid extract multiple,and when crude oil viscosity is fixed and liquid extract multiple is same,the lower water cut the better liquid extract effect.The cumulative increment in oil production of positive rhythm liquid extract is higher than that in oil production of inverted rhythm liquid extract,the liquid extract effects of the combination in lower,middle and higher pressure coefficient are better than that of the combination in higher,middle and lower pressure coefficient.The modification methods of flooding well network were studied with reservoir numerical simulation technique,and in terms of the calculated results of the cumulative oil production of 4 models of well network allocation,the models with water injection in main body and oil producing at edges are better than those with water injection at edges and oil producing at edges.This study has a certain guiding significances to determine reservoir potential,the rational liquid extract plan for oil wells and the rational allocation of flooding well network during the later development stage of complex fault block oil and gas pool.