摘要
基于区域分形和拟压力法,建立一种可用于致密油藏直井体积压裂稳态产能评价的解析模型,模型考虑人工裂缝网络展布、压敏及启动压力梯度的影响;应用模型分析压敏系数、分形因数、启动压力梯度、改造半径及生产压差等影响产能的参数.结果表明:压敏系数对产能的影响较大,压敏系数越大,产能越低,当压敏系数大于0.1MPa-1时,放大生产压差增产效果不明显;分形因数越大,产能越高,生产压差越大,分形因数对提高产能的效果越显著;启动压力梯度越大,产能越低;改造半径越大,产能越高,改造半径对产能的影响受分形因数和生产压差的制约,分形因数及生产压差越大,改造半径对产能的影响越大.该结果为合理开发致密油藏及体积压裂优化设计提供参考.
Based on area fractal and pseudopressure method,a steady state deliverability evaluation analytical model of vertical well after fracture network reconstruction in tight oil reservoir has been established.The model has taken artificial fracture network distribution,pressure-sensitive and threshold pressure gradient into consideration.Some parameters,such as pressure-sensitive coefficient,fractal coefficient,threshold pressure gradient and reconstruction radius,were analyzed by using the established model.The results show that pressure-sensitive coefficient has large effect on deliverability,the larger pressure-sensitive coefficient is,the higher the deliverability is.When pressure-sensitive coefficient value is big(more than 0.1MPa-1),it is not obvious to enhance deliverability by enlarging the production pressure.The larger fractal coefficient negative value is,the higher deliverability is,and the larger production pressure is,the more remarkable effect of enhancing deliverability by fracture network reconstruction is.The greater threshold pressure gradient value is,the lower deliverability is.The larger reconstruction radius is,the higher deliverability is,the effect is restricted by fractal coefficient and production pressure,the larger fractal coefficient or production pressure is,the more effect reconstruction radius makes.It has a certain reference value on developing tight reservoir reasonable and optimization for fracture network reconstruction.
出处
《东北石油大学学报》
CAS
北大核心
2014年第1期91-96,7,共6页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05016-006)
关键词
致密油藏
体积压裂
稳态产能
分形因数
启动压力梯度
压敏系数
改造半径
tight oil reservoir
fracture network reconstruction
steady state deliverability
fractal factor
threshold pressure gradient
pressure-sensitive coefficient
reconstruction radius
