双孔低渗油藏压力响应特征  

Characteristics of Pressure Response in Dual-Porosity Low Permeability Reservoirs

作　　者：刘洪[1] 王新海[1] 杨锋[1] 胡治华 

机构地区：[1]长江大学.油气资源与勘探技术教育部重点实验室,湖北荆州434023 [2]中海油天津分公司,天津300452

出　　处：《油气井测试》2011年第3期10-11,14,共3页Well Testing

基　　金：石油科技中青年创新基金项目(05E7046)

摘　　要：基于双孔低渗油藏的数学模型,以低渗油藏调查半径公式计算动边界,开展了拉普拉斯变换耦合有限差分法在双孔低渗试井中的研究。采用拉普拉斯变换得到拉普拉斯空间数学模型后,对模型进行有限差分法离散求解井底压力,绘出了双孔低渗油藏试井图版,研究了不同启动压力梯度、窜流系数、储能比对双孔低渗试井曲线的影响。结果表明,在无法求取解析解问题中(如低渗问题),使用本算法可得到理想结果;采用拉普拉斯变换消除时间网格,计算的井底压力比有限差分法准确。Based on the mathematical model of dual-porosity and low permeability reservoir and calculation of dynamic outer boundaries by investigation radius in low permeability reservoirs,a study on application of Laplace transform coupling with finite difference method in well test in dual-porosity low permeability reservoir is done.After obtaining mathematical model in Laplace space by Laplace transform,bottom hole pressure is solved by finite difference,then type curves of well test interpretation for dual-porosity and low permeability reservoir are drawn,the influence of different start pressure gradients,interporosity flow coefficients and storativity ratios etc.is researched.The results show that in the cases of no analytic solution(one example is the problem of well test in dual-porosity and low permeability reservoir) this method can be used to get very good answer,and the bottom hole pressure calculated by Laplace transform to avoid time network is more correct than that by finite difference.

关 键 词：拉普拉斯变换 有限差分法 耦合 双孔低渗油藏 

分 类 号：TE348[石油与天然气工程—油气田开发工程]