考虑压裂缝网连通的页岩气井组试井分析方法

doi:10.13809/j.cnki.cn32-1825/te.2025.01.010

摘要/Abstract

摘要： 针对页岩气藏邻井压裂、开发调整等引起的井间干扰等问题，现有基于单井或未考虑缝网连通的井组动态评价方法难以适用。基于变导流能力裂缝模型，构建了考虑压裂裂缝缝网连通的页岩气井组试井分析模型，对裂缝缝网进行离散化，将多级压裂井井组模型方程转化为线性方程组进行求解并获得了井组井底压力解。通过有限体积数值方法对井组井底压力解进行了对比验证，建立了有连通裂缝和无连通裂缝时的井组井底压力典型曲线特征图，并给出了涪陵页岩气田2个平台4口井的应用实例。结果表明：①生产井具有双线性流1/4特征段、线性流1/2特征段、非稳态窜流特征段、边界拟稳态流特征段，而非生产井很难出现双线性和线性流特征段；②有连通裂缝和无连通裂缝情况下，利用有限体积数值方法计算的井组井底压力解与研究方法计算结果完全一致；③涪陵页岩气田2个平台4口井的实测数据解释评价结果与现场情况吻合，验证了方法的可靠性和实用性。研究成果可为页岩气藏储层参数的计算，压裂改造参数的计算以及井间连通性评价提供技术支持。

关键词: 页岩气, 多级压裂, 裂缝连通, 井组, 试井分析

Abstract:

To address the issue of interwell interference caused by adjacent well fracturing and development adjustments in shale gas reservoirs, existing dynamic evaluation methods for well groups based on single wells or those ignoring fracture network connectivity are inadequate. A well test analysis model for shale gas well groups, incorporating the connectivity of fracturing network, was developed based on a variable conductivity fracture model. By discretizing the fracture network, the model equation of multi-stage fracturing well groups was transformed into linear equations and the bottom-hole pressure solution of well groups was obtained. The bottom-hole pressure solution of the well groups was compared and validated using the finite volume numerical method. Typical characteristic curve diagrams of bottom-hole pressure, both with and without connected fractures, were established. Application examples of four wells on two platforms in the Fuling shale gas field were provided. The results showed that: ① Production wells had bilinear flow (1/4 stage), linear flow (1/2 stage), unsteady crossflow, and boundary quasi-steady flow stages, while non-production wells rarely had bilinear or linear flow stages. ②Under both connected and unconnected fractures, the bottom-hole pressure solution of the well group calculated by the finite volume numerical method was entirely consistent with that calculated by the method proposed in this paper. ③ The interpretation and evaluation results of measured data from four wells on two platforms in the Fuling shale gas field were consistent with field observations, verifying the reliability and practicality of the proposed method. The findings provide technical support for calculating shale gas reservoir parameters and fracturing parameters, and evaluating interwell connectivity.

Key words: shale gas, multi-stage fracturing, fracture connectivity, well group, well test analysis

中图分类号:

TE35

胡小虎,刘华,何辉等. 考虑压裂缝网连通的页岩气井组试井分析方法[J]. 油气藏评价与开发, 2025, 15(1): 79-87.

HU Xiaohu,LIU Hua,HE Hui, et al. Well test analysis method of shale gas well groups considering fracture network connectivity[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(1): 79-87.

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平台	储层渗透率/10^-3 μm²	储容比	窜流系数	初始压力/MPa
X1	8.73×10^-3	0.05	3.05×10^-7	38.20
X2	0.82×10^-3	0.05	1.57×10^-5	27.80

平台	井名	平均裂缝无因次导流能力	平均裂缝长度/m
X1	X1-1	15.620	123.50
	X1-2	3.213	115.00
	X1-3	5.106	76.80
X2	X2-1	9.163	108.00