裂缝性复合气藏高速非达西试井模型研究
Research on high-velocity non-darcy well testing models for fractured composite gas reservoirs
聂仁仕 1李佳琦 2赵云峰 2张一军 2马驰 3宁坤 3穆凌雨3
作者信息
- 1. 油气藏地质及开发工程全国重点实验室(西南石油大学)，成都 610500
- 2. 中国石油新疆油田分公司（采油工艺研究院），新疆克拉玛依 834000
- 3. 中国石油集团工程技术研究院有限公司，北京 102206
- 折叠
摘要
裂缝性气藏非均质性强，近井地带易出现高速非达西效应。基于高速非达西流指数式运动方程，考虑内外区孔渗物性差异、井筒储集效应和表皮效应，建立了"均质-均质"、"双重-均质"、"双重-双重"三种两区复合渗流模型。利用Laplace域变换联合数值反演技术获得半解析解，并据此生成井底压力随时间的动态响应曲线，同时对各参数的影响规律进行分析。结果表明：裂缝性"双重-双重"两区复合气藏高速非达西渗流存在10个渗流阶段；渗流指数反映非达西效应强弱，其数值越大表示非达西效应越不明显；高速非达西流动区域半径越小，高速非达西流动持续时间更短，此时达西流动行为提前出现；高速非达西流动区域裂缝储容比越高，地层稳压能力下降，压力下降速度加快；高速非达西流动区域窜流系数越大，高速非达西流动区域窜流越早发生；流度比越大，地层压力下降速度越快；储能系数越大，过渡流阶段压力下降速度越快；达西流动区域裂缝储容比越大，地层压力下降速度加快；达西流动区域窜流系数越大，达西区窜流越早发生。该模型可用于裂缝非均匀发育气藏的高速非达西渗流特征研究。
Abstract
Fractured gas reservoirs exhibit strong heterogeneity, and high-velocity non-Darcy effects readily occur in the near-wellbore region. Based on the exponential flow equation for high-velocity non-Darcy flow, considering the differences in porosity and permeability properties between inner and outer zones, wellbore storage effect, and skin effect, three types of two-zone composite flow models were established: "homogeneous-homogeneous," "dual-homogeneous," and "dual-dual." A semi-analytical solution is obtained by applying the Laplace-domain transform combined with numerical inversion techniques. Based on this solution, the transient bottomhole pressure response over time is generated, and the influences of various model parameters are subsequently analyzed. Results show that: high-velocity non-Darcy flow in fractured "dual-dual" two-zone composite gas reservoirs exhibits 10 flow regimes; the flow exponent reflects the strength of non-Darcy effects, where a larger value indicates a weaker deviation from Darcy behavior. A smaller radius of the high-velocity non-Darcy flow region shortens the duration of the non-Darcy regime, allowing Darcy flow to appear earlier. When the fracture storage capacity in the high-velocity non-Darcy zone increases, the reservoir pressure-buffering capability weakens, leading to a faster pressure decline. A larger interporosity flow coefficient in the non-Darcy region causes earlier matrix-to-fracture transfer. As the mobility ratio increases, the formation pressure drops more rapidly. A higher storativity ratio accelerates pressure depletion during the transitional flow period. In the Darcy region, a larger fracture storage capacity also results in a quicker pressure drop, and an increase in the interporosity flow coefficient triggers earlier crossflow. The degree of fracture development near the wellbore affects the mobility ratio, storativity ratio, and corresponding curve characteristics. Therefore, the proposed model can be applied to investigate high-velocity non-Darcy flow characteristics in gas reservoirs with heterogeneous fracture development. The proposed model can be applied to study high-velocity non-Darcy flow characteristics in gas reservoirs with non-uniform fracture development.关键词
高速非达西流/试井模型/复合储层/气藏/渗流指数Key words
High-velocity non-Darcy flow/Well testing model/Composite formation/Gas reservoir/Flow Exponent引用本文复制引用
聂仁仕,李佳琦,赵云峰,张一军,马驰,宁坤,穆凌雨.裂缝性复合气藏高速非达西试井模型研究[EB/OL].(2026-05-14)[2026-05-16].http://www.paper.edu.cn/releasepaper/content/202605-51.学科分类
油气田开发
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