某气田气井压力前缘到达渗流边界时间的判断
Time Judgment of Pressure Transmitting to the Seepage Boundaries in X Gas Field
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- 引用格式:
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杨炳秀,何东博,王丽娟,孟德伟.某气田气井压力前缘到达渗流边界时间的判断[J].天然气与石油,2016,34(2):0.doi:
Yang Binxiu, He Dongbo, Wang Lijuan, Meng Dewei.Time Judgment of Pressure Transmitting to the Seepage Boundaries in X Gas Field[J].Natural Gas and Oil,2016,34(2):0.doi:
- DOI:
- 作者:
- 杨炳秀1 何东博2 王丽娟2 孟德伟2
Yang Binxiu, He Dongbo, Wang Lijuan, Meng Dewei
- 作者单位:
- 1.中国石油勘探与生产公司, 2.中国石油勘探开发研究院
1.CNPC Exploration and Production Company; 2.CNPC Exploration and Development Institute
- 关键词:
- 致密砂岩;气井；压力前缘；边界；时间
Tight sandstone; Gas well; Pressure front; Boundary; Time
- 摘要:
- 致密砂岩气藏储层物性差,流体流动阻力大、渗流速度低,压力前缘经过较长时间才能到达渗流边界。在进行气井生产指标评价时,采用压力前缘到达边界前和到达边界后的生产动态资料所得到的结果存在较大差异。准确判断气井压力前缘传导到边界的时间对评价气井生产指标尤为重要。以中国某致密砂岩气田为例,应用流线模拟技术、影响半径计算公式、产量不稳定分析法和气井动储量图版等四种方法进行了压力前缘到达边界时间的判断,并对判断结果进行了综合分析,得到该气田气井的压力前缘到达边界的时间为200~300 d。该结果较好地解释了随着生产时间的延长,气井生产指标发生变化的原因,为科学合理评价气井生产指标提供了指导。
Pressure front could reach the boundaries after a long lime due to poor physical property in tight reservoir, high flow resistance and small seepage speed. While evaluating production index of gas well, results differ greatly before and after pressure front reaches the boundaries. It is important to determine the time of transmitting pressure front to the reservoir boundary accurately. X tight sandstone gas field is taken as an example. Time is judged with four methods, such as numerical simulation by streamline, the calculation formula of radius of influence, rate transient analysis and the chart of dynamic reserve, the result of which is comprehensively analyzed that it takes 200-300d for pressure front to reach the reservoir boundaries. The result better explains why the production index changes with the extension of production duration, and also provides a reference for evaluating production index of gas well.
