天然气地球科学 ›› 2021, Vol. 32 ›› Issue (4): 465471.doi: 10.11764/j.issn.1672-1926.2020.10.006
• 天然气开发 • 下一篇
Zhi-rong WANG(),Zhen-yang WEN,Ling-xia CHEN
摘要:
煤层气井产能预测一直是天然气工业领域试图解决的技术性难题。为探究水力压裂条件下裂隙性煤储层气渗透机理及产能规律,首先考虑其原生裂隙的几何特征对裂缝扩展规律的影响,结合经典PKN模型建立了改进的水力裂缝扩展模型;其次考虑排采过程中水力裂缝几何尺寸变化对煤储层孔隙率的影响,基于储层压力梯度动态方程建立了储层动态渗透率模型;最后运用流体质量守恒原理建立了裂隙性储层煤层气垂直井产能预测模型。运用该模型对河南焦作“三软”矿区GW试?008井进行了试验期70 d的产能计算,并与实际排采值进行对比,发现理论计算值与实际排采值动态变化曲线吻合度较高,平均日产气量分别为360.768 m3/d与381.489 m3/d,相对误差仅为6%,验证了产能模型的正确性。研究成果对我国“三软”矿区煤层气的开发利用具有重要的借鉴意义。
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