多井同采定容气藏动态分析方法  

Dynamic analysis method of constant volume gas reservoir with multi-well production

作　　者：鹿克峰 程超逸 邓雅婷 李洋森 肖晗 LU Kefeng;CHENG Chaoyi;DENG Yating;LI Yangsen;XIAO Han(CNOOC China Limited Shanghai Branch,Shanghai,200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司勘探开发研究院,上海200335

出　　处：《世界石油工业》2023年第6期79-87,共9页World Petroleum Industry

基　　金：国家重大科技专项“东海深层低渗—致密天然气勘探开发技术”(2016ZX05027)。

摘　　要：多井同采是气藏常见的开采方式,但传统气藏动态分析方法(物质平衡、试井分析、产量递减分析)会受到多井干扰的影响,研究一套适用多井同采气藏的动态分析方法意义重大。基于Blasingame多井同采气藏拟稳态流动方程,推导并发现定容气藏在气井拟稳态流动阶段存在的3条基本规律:多井同采气藏在同一连通砂体内,任一口生产井单位瞬时产气量对应的规整化井底拟压力降等于连通砂体规整化平均地层拟压力降;所有生产井具有相近的产量递减率;任一口生产井的采气指数近似常数。设计多井同采气藏的模拟模型,动态预测结果验证了3条基本规律的正确性。选择鄂尔多斯盆地临兴中区He6气藏为研究实例,组合应用3条基本规律,形成多井同采气藏动态分析方法。①基于规律2,对生产井井间连通性作出明确诊断;②基于规律1,以连通气井作为同一动储量评估单元,计算气藏连通体的动储量以及平均地层压力;③基于规律3,以单井所在连通体的平均地层压力为参数,计算单井采气指数的变化。研究形成的新方法突破了传统动态分析方法在多井同采气藏中的应用限制,以常见的生产数据作为基础参数,即可完成井间连通性评价、动储量计算以及气井动态跟踪。Multi-well production is a common production method for gas reservoirs,but in these case,traditional gas reservoir performance analysis methods(such as material balance,interference well testing,production decline analysis,etc.)may be subject to many limitations.It is of great significance to study a dynamic analysis method suitable for multi-well production conditions.It is derived three basic dynamic laws of this kind of gas reservoir in the pseudo steady flow stage based on the equation of Blasingame.The bottom hole pressure drop corresponding to the instantaneous gas production of well is equal to the average pressure drop of the gas reservoir;The gas wells connected with reservoirs have similar production decline rate;The gas production index of wells is approximately constant.Then a multi-well gas reservoir simulation model with unconnected reservoirs is designed,and the correctness of these three laws is verified.The He6 gas reservoir in middle of Linxing area of Ordos Basin is selected as a research example,and combined three basic laws are combined to complete a comprehensive evaluation of gas reservoir performance.Firstly,Rule 2 is used to clarify the connectivity between production wells.Next,based on Rule 1,the connected gas wells are considered as the same dynamic reserve evaluation unit and the dynamic reserves and average formation pressure is calculated.Finally,based on Rule 3,the average formation pressure of the dynamic reserve unit is used to evaluate the changes in the gas productivity index of a single well.The dynamic analysis method formed breaks through the limitations of traditional methods in multi-well production gas reservoirs,which can achieve inter well connectivity analysis,dynamic reserve calculation and production performance tracing based on basic production data.

关 键 词：油气田开发 多井同采 动储量 储层连通性 动态跟踪 

分 类 号：T357.6[一般工业技术]