考虑裂缝干扰的致密砂岩压裂水平气井产能计算及影响因素研究  

Productivity Calculation of Fractured Horizontal Gas Well in Tight Sandstone With Consideration of Fracture Interference and Research on Influencing Factors

作　　者：张强 姚为英 任宜伟 尹彦君 姜康 ZHANG Qiang;YAO Wei-ying;REN Yi-wei;YIN Yan-jun;JIANG Kang(CNOOC EnerTech-Drilling&Production Company,Tianjin 300450,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300450

出　　处：《当代化工》2021年第8期1888-1892,共5页Contemporary Chemical Industry

基　　金：国家科技重大专项,大型油气田及煤层气开发(项目编号:2017ZX05064)。

摘　　要：致密气藏的产能预测对气藏开发方案设计和气田合理配产都具有十分重要的意义。物模实验表明,致密低渗透气藏存在压敏效应和阀压效应等渗流特征,达西定律不再适用。首先,利用物模实验推出压敏效应和阀压效应的经验公式。其次,在气体渗流理论基础上,建立了广义达西方程,并利用保角变换等数学方法,推导了考虑压敏效应和阀压效应的考虑裂缝干扰的致密气藏压裂水平井产能计算公式。最后,对压敏效应、阀压效应以及裂缝对气井产能的影响做了分析。该研究丰富了致密气藏压裂水平井产能评价方法,并且贴合现场实际,对优化压裂水平井参数、指导致密气藏水平井开发具有重要的意义。Tight gas well productivity prediction is of great significance for gas reservoir development design and reasonable allocation. Physical simulation experiments show that pressure sensitive effect, starting pressure gradient and other seepage characteristics are exist. So Darcy’s law is no longer applicable. First, physical simulation was used to derive empirical formula of pressure sensitive effect and starting pressure gradient. Secondly, on the basis of gas seepage theory, using the conformal mapping and other mathematical method, the productivity calculation formulas of the fractured horizontal well were derived, considering starting pressure gradient and pressure sensitive effect and fracture interference. Finally, the influencing factors of production capacity were analyzed, including pressure-sensitive effect, starting pressure gradient and fracture. This study has enriched the productivity evaluation method of fracturing horizontal wells in tight gas reservoirs, and is in line with the field practice, is of great significance for optimizing fracturing horizontal well parameters and guiding the development of horizontal wells in tight gas reservoirs.

关 键 词：致密气藏 物模实验 压敏效应 阀压效应 裂缝干扰 产能计算 

分 类 号：TE328[石油与天然气工程—油气田开发工程]