在注射掉落测试期间CBM井的短暂压力行为,考虑到二次压力梯度
Wei Gu1, Jiaqi Wu2, Zheng Sun1
1State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China.
Nanomaterials (Basel, Switzerland)
|July 13, 2024
概括
这项研究引入了煤床甲 (CBM) 注射掉落试验的新模型,准确地计算了二次压力梯度. 这有助于提高水库属性估计和产量预测,从而提高CBM回收率.
科学领域:
- 石油工程是石油工程中的一个.
- 储水库工程 储水库工程
- 地质科学 地质科学
背景情况:
- 常规的煤床甲 (CBM) 模型用于注射掉落测试通常忽略二次压力梯度效应.
- 这种遗漏导致模拟流体行为的不准确性,并确定诸如透性和可存储性之类的关键储性质.
- 不准确的水库特征导致低于最佳的井位和生产策略.
研究的目的:
- 开发一种新的分析模型,将CBM水库中的二次压力梯度和双透性流量机制纳入其中.
- 为了提供一个更准确的方法来分析注射掉落测试在CBM构成,特别是那些具有纳米孔状结构.
- 提高水库性能估计和产量预测的可靠性.
主要方法:
- 开发了一种新的分析模型,明确包括二次压力梯度和双透性流量.
- 利用变量替换来导出拉普拉斯域中的分析解决方案.
- 将拉普拉斯域解决方案转换为实体空间解决方案,用于实际应用和类型曲线生成.
主要成果:
- 拟议的模型准确地描绘了CBM井的非线性流动行为,与传统模型不同.
- 创建了新型曲线,用于在注入掉落测试期间分析井口压力反应.
- 量化地将拟议模型与传统模型进行了比较,突出了由于忽视的二次压力梯度而导致的差异.
结论:
- 新的分析模型通过计算二次压力梯度,提供了更可靠的压力和压力导数曲线.
- 精确的建模增强了水库的特征,从而改善了CBM操作中的生产策略和经济成果.
- 该模型特别适用于富含纳米孔的CBM构成,它们表现得像自然纳米材料一样.
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