摘要
针对近井地带与远井地带性质不同的油藏,建立了内区双重、外区均质的复合油藏数学模型并求解,绘制产量、产量积分和产量积分导数双对数样板曲线,对每个流动阶段物理渗流机理和曲线特征进行分析。当内区的渗透率较好时,内、外区交接处的产量积分导数曲线向上翘,反之则向下掉;弹性储能比影响窜流的强弱和时间的长短。当压力传播到油藏边界时,产量递减加剧,产量积分、产量积分导数曲线在边界处为一条斜率为-1的直线段,表现为调和递减。通过现场实例计算分析,得了油藏递减期的主要参数,符合生产实际。
In view of reservoirs with different properties near and far wellbore, the mathematic model for dual porosity （inner zone）- homogeneous （outer zone） composite reservoir is presented and solved, obtaining log-log type plots of production rate, rate integration and its derivative, and making analyses of flow mechanisms and plot characteristics at each flowing stage. Study shows that when the inner zone＇s permeability is better, the derivative curve of rate integration at junction of inner and outer zones will bend up, otherwise, fall down. The crossflow effect and its endurance are affected by storativity ratio. When the pressure spreads to the reservoir boundary, the rate will sharply decline, and the integral and integral derivative curves assume a straight line with slope of -1, which is the indication of harmonic decline. The case study obtains the main parameters in production decline stage, which are accordant with the real situations.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2010年第1期63-65,共3页
Xinjiang Petroleum Geology
关键词
复合油气田
多重介质
产量
递减
模型
composite reservoir, multi-medium
production rate
decline
model
