摘要
运用地质建模手段,结合煤层气排采数据,建立精细化地质模型。在地质模型中合理布井,模拟煤层气排采并进行历史拟合。根据研究区生产井的排采数据,对该井的排采阶段重新划分,优化筛选排采控制方案,将历史井做多级压降模拟,并与历史数据对比,分析多级降压排采制度在不同排采阶段的精细化优化。结果表明:最优的压降方案是降压10天,稳压10天,在未见气阶段的压降幅度是0.18 MPa/d,临界产气阶段的井底压降大小是0.04 MPa/d,快速增产阶段的井底压降大小是0.02 MPa/d,稳定产气阶段的井底压降大小是0.005 MPa/d。
Using geological modeling methods,combined with coalbed methane drainage data,a refined geological model is established.The coalbed methane drainage is simulated and history fitting is conducted after arranging wells in geological models reasonably.According to the drainage data of the production wells in the study area,the drainage stage of the well is redivided,and the drainage control scheme is optimized.The historical well is simulated by multi-stage pressure drop and compared with historical data.The next step is analyzing the refined optimization of multi-stage pressure drop and drainage system in different drainage stages.The results show that the optimal pressure drop scheme is to reduce the pressure for 10 days and stabilize the pressure for 10 days.The pressure drop in the no-gas stage is 0.18 MPa/d.Then 0.04 MPa/d in the critical gas production stage,0.02 MPa/d in the rapid stimulation stage.,and 0.005 MPa/d in the steady gas production stage.
作者
周圣昊
Zhou Shenghao(The third oil production plant of Changqing Oilfield Branch,Yinchuan,Ningxia 750001,China)
出处
《非常规油气》
2019年第6期63-67,共5页
Unconventional Oil & Gas
关键词
煤层气
多级压降
地质模型
数值模拟
coal bed methane
multilevel pressure drop
geological model
numerical simulation
