确定油气井泄流半径的新方法  

A new method for determining drainage radius of oil and gas well

作　　者：任允鹏[1,2] 吴晓东[1] 王少军[3] 

机构地区：[1]中国石油大学(北京)石油天然气工程学院,北京102249 [2]中国石化股份胜利油田分公司地质科学研究院,山东东营257015 [3]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2010年第5期73-75,共3页Petroleum Geology and Recovery Efficiency

摘　　要：在油气田开发初期,试采井的泄流半径是了解储层发育规模、确定合理井距的重要指标。确定油气井泄流半径的传统方法一般采用压降或压力恢复试井。然而,对于低渗透油气藏来说,由于压力波的传播速度异常缓慢,在测试期间往往探测不到泄流边界,为解决该问题,提出了一种计算泄流半径的新方法,即利用单井渗流方程结合物质平衡原理,分析油气井试采生产历史数据,进而计算出泄流半径。该方法应用结果和探边测试结果的相对误差小于10%,能够满足工程施工的精度要求,而且还可以应用于未探边测试井的泄流半径计算。应用结果表明,气藏的高产区块井距约为3 000m,中产区块约为2 500m,低产区块约为1 500m;油藏的合理井距约为300～500m。该方法已经成功应用于合理井距确定、井网评价和数值模拟参数场修改。In the early oil and gas field development, the drainage radius of the trial-produce well is an important index to understand the scale of reservoir development, as well as determining the reasonable well spacing. The traditional pressure draw down or build up test methods were applied to achieve the value. However,the drainage boundary is not detected during testing since propagation velocity of the pressure wave is too slow within the low permeability reservoir;Therefore,a new method of calculating drainage radius which adopts the single well flow equation and combined with material-balance theory and the analysis of test history of producing well is proposed. The comparison results of the new method with reservoir limit testing show that, the error is less than 10% ,and it is completely qualified for the engineering requirement. The approach also could be applied on calculating drainage radius of well without reservoir limit testing. Practical application results in gas reservoir indicate that the well space is approximately 3000 meters for high oil-gas production region,approximately 2500 meters for middle oil-gas production region,approximately 1500 meters for low oil-gas production region and the reasonable well spacing is about 300-500 meters. The approach was widely applied for the determination of reasonable well spacing,the evaluation of the well pattern,and the modification of simulation parameters field with a very good performance.

关 键 词：物质平衡原理 泄流半径 井网评价 合理井距 低渗透油气藏 

分 类 号：TE33[石油与天然气工程—油气田开发工程]