干热岩压裂储层布井方式优选数值模拟

张立刚; 胡志楠; 范森; 罗晓雷; 丁河嘉; 马媛媛; 李庆龙; 宋永扬

doi:10.19509/j.cnki.dzkq.tb20230661

干热岩压裂储层布井方式优选数值模拟

doi: 10.19509/j.cnki.dzkq.tb20230661

1.
东北石油大学石油工程学院, 黑龙江大庆 163318
2.
抚顺职业技术学院, 辽宁抚顺 113122

详细信息

作者简介:
张立刚, E-mail: zhangligang529@163.com

通讯作者:
胡志楠, E-mail: zina1999@126.com

中图分类号: P314.2
计量
- 文章访问数: 442
- PDF下载量: 141
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-28
- 录用日期: 2024-01-17
- 修回日期: 2024-01-11

Optimization of pattern of well in hot dry rock fractured reservoirs through numerical simulation

1.
School of Petroleum Engineering, Northeast Petroleum University, Daqing Heilongjiang 163318, China
2.
Fushun Vocational Technical Institute, Fushun Liaoning 113122, China

More Information

Author Bio:
ZHANG Ligang, E-mail: zhangligang529@163.com

Corresponding author: HU Zhinan, E-mail: zina1999@126.com

摘要

摘要:
增强型地热系统(EGS)是从干热岩储层中提取热能的重要手段, 而布井方式是影响其采热效果的关键因素, 目前开展的布井方式研究较少考虑压裂储层开采模型的影响。建立了干热岩压裂储层采热的数值模型, 通过不同位置的基质岩体温度下降幅度、热提取率、采出温度和采热功率对比分析了4种不同的布井方式对EGS采热性能的影响。结果表明: 相较于直井, 水平井的流体热交换的面积更大, 能充分开发裂缝间的热量。在生产30 a时, 考虑水力压裂裂缝连通的情况下, 水平井一注两采模型的采热效率最高, 其在垂直于井方向上温度波及范围约690 m, 基质岩体平均温度下降38.09 K, 热提取率为24.42%, 采热功率为3.5 MW。研究成果为提高地热系统产热量、实现干热岩高效可持续开发提供了理论参考。
- 干热岩 /
- 压裂储层采热 /
- 增强型地热系统(EGS) /
- 数值模拟 /
- 布井方式 /
- 水平井 /
- 敏感性分析
Abstract: Objective
An enhanced geothermal system (EGS) is a crucial means of extracting thermal energy from hot dry rock reservoirs, and the pattern of well plays a key role in influencing heat extraction efficiency. Currently, there is limited research on pattern of well considering fractured reservoir exploitation models.
Methods
This paper establishes a numerical model for heat extraction from hot dry rock fractured reservoirs and analyses the impact of four different patterns of wells on EGS heat extraction performance through a comparative analysis of the temperature decrease of the bedrock, heat extraction rate, production temperature, and heat extraction power.
Results
The results indicate that, compared to vertical wells, horizontal wells have a larger area for fluid heat exchange, allowing for more efficient heat development between fractures. After 30 years of production, considering the case of hydraulic fracturing fracture connectivity, the one injection and two production schemes of horizontal wells exhibit the highest heat extraction efficiency. In the vertical well direction, the temperature influence range is approximately 690 m, with an average temperature decrease of 38.09 K in the bedrock, a heat extraction rate of 24.42%, and a heat extraction power of 3.5 MW.
Conclusion
The research results provide a theoretical reference for enhancing the heat production of geothermal systems and achieving efficient and sustainable development of hot dry rock resources.
- hot dry rock /
- fractured reservoir heat extraction /
- enhanced geotherm system(EGS) /
- numerical simulation /
- pattern of well /
- horizontal well /
- sensitivity analysis
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 双重孔隙介质模型示意图

Figure 1. Schematic diagram of a dual-porosity dual-permeability model

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图 2 网格划分图

Figure 2. Grid partitioning diagram

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图 3 不同网格数量下生产30 a后的模拟结果

Figure 3. Simulation results for different grid numbers after 30 years of production

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图 4 布井方式示意图

Figure 4. Schematic diagram of the well layout

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图 5 不同模拟方案所建模型平面示意图

Figure 5. Schematic diagram of the model plane for different simulation schemes

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图 6 直井模型不同生产时间的温度场变化图

a~f.方案1(直井一注一采); g~l.方案2(直井一注两采)。AB.垂直于井直线代号；方案参数见表 2，下同

Figure 6. Temperature field variation diagram for the vertical well model after different years of production

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图 7 直井模型不同生产时间的直线AB温度分布曲线

a.方案1(直井一注一采); b.方案2(直井一注两采)

Figure 7. Temperature distribution curve along Line AB for the vertical well model after different years of production

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图 8 水平井模型不同生产时间的温度场变化图

a~f.方案3(水平井一注一采); g~l.方案4(水平井一注两采)

Figure 8. Temperature field variation diagram for the horizontal well model after different years of production

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图 9 水平井模型不同生产时间的直线AB温度分布曲线

a.方案3(水平井一注一采); b. 方案4(水平井一注两采)

Figure 9. Temperature distribution curve along Line AB for the horizontal well model after different years of production

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图 10 4种布井方式生产30 a时直线AB处温度分布曲线

Figure 10. Temperature distribution curve along Line AB for four patterns of well after 30 years of production

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图 11 不同方案下基质岩体平均温度(a)、热提取率(b)、采出温度(c)和采热功率(d)变化曲线

Figure 11. Variation curves of average temperature of bedrock(a), heat extraction rate(b), production temperature(c) and heat extraction power (d) under different schemes

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表 1 热储应用初始参数表

Table 1. Initial parameters for thermal storage applications

模型参数	数值	模型参数	数值
地层压力/MPa	20	天然裂缝间距/m	50
地层温度/K	433.15	岩石导热系数/(W·m^-1·K^-1)	2.74
孔隙度/%	1.86	上覆岩层导热系数/(W·m^-1·K^-1)	1.75
渗透率/10^-3 μm²	0.63	岩石体积热容/(10⁶ J·m^-3·K^-1)	2.18
注水温度/K	298.15	水相导热系数/(W·m^-1·K^-1)	0.59
水体积热容/(10⁶ J·m^-3·K^-1)	4.2	裂缝孔隙度/%	50
裂缝渗透率/10^-3 μm²	50 000	裂缝开度/10^-3 m	2
套管外径/m	0.177 8	套管厚度/m	0.01
套管体积热容/(10⁶ J·m^-3·K^-1)	3.63	套管导热系数/(W·m^-1·K^-1)	44.9
水泥环厚度/m	0.04	水泥环导热系数/(W·m^-1·K^-1)	2.1
水泥环体积热容/(10⁶ J·m^-3·K^-1)	1.67

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表 2 模拟方案参数

Table 2. Parameters of simulation scheme

方案	裂缝半长/m	裂缝数/条	注入流量/ (kg·s^-1)
方案1(直井一注一采)	75	1	1
方案2(直井一注两采)	150	1	9
方案3(水平井一注一采)	75	9	1
方案4(水平井一注两采)	150	9	9
注：注采井距150 m; 生产压差12 MPa

下载: 导出CSV

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