产量递减方程判别理论基础及应用

应用Arps方程进行产量递减类型判别和趋势预测,常适用于开发历史较长的油田,而对于开采历程较短、实际生产数据很少的油田,应用Arps方程将受到一定程度的限制。作者从相渗及物质平衡基本原理出发,从理论上进一步完善了Axps方程的的理论推导,使其与目前相渗研究成果相匹配。这样,在油田开发初期,一旦确定了油藏的储集层物性及相渗特点──标准化油根相对渗透车关系式,即可判别其递减类型,确定其初始递减率并进行趋势预测。经实例验证,方法可行、可靠。

FUNDAMENTAL THEORY ON JUDGEMENT OF PRODUCTION DECLINE TYPE AND APPLCATION

Applying Arps equation to judge production decline type and predict trend is usually applicable to oilfield development for a long time, while to oilfield development for a short term and lack of production data, application of Arps equation will get a little limited. From basic principle of phase permeability and material balance, this paper furiher presented the derivation for the decline equations of elastic drive and watealrive oiffields, making it match the current research result of phase permeability. Once reservoir petrophysical properties and phase permeabilities charateristics-standardized oil phase permeability relationship is defined, decline types can be judged, and then initial decline rate can be confirmed and trend will be predicted. Examples using actual field data show that the method is feasible and reliable.