页岩油藏压裂水平井压–闷–采参数优化研究

陈志明; 赵鹏飞; 曹耐; 廖新维; 王佳楠; 刘辉

doi:10.11911/syztjs.2022005

页岩油藏压裂水平井压–闷–采参数优化研究

doi: 10.11911/syztjs.2022005

1.
油气资源与探测国家重点实验室（中国石油大学（北京））, 北京 102249
2.
中国石化石油工程技术研究院，北京 102206

基金项目: 国家自然科学基金项目“基于试井理论和数据驱动的页岩油藏三维裂缝网络参数智能反演”（编号：52074322）；北京市自然科学基金项目“页岩储层变导流能力裂缝网络井试井反演理论研究”（编号：3204052）部分研究内容

详细信息

作者简介:
陈志明（1989—），男，湖北黄冈人，2013年毕业于长江大学石油工程专业，2018年获中国石油大学（北京）油气田开发工程专业博士学位，教授，博士生导师，主要从事非常规油气藏试井动态反演及压裂评价方面的教学和科研工作。E-mail：zhimingchn@cup.edu.cn

中图分类号: TE319
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出版历程
- 收稿日期: 2021-07-29
- 修回日期: 2022-01-04
- 网络出版日期: 2022-02-11
- 刊出日期: 2022-04-06

Fracturing Parameters Optimization of Horizontal Wells in Shale Reservoirsduring "Well Fracturing-Soaking-Producing"

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
2.
Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China

摘要

摘要: 目前在页岩油藏的多段压裂水平井压–闷–采过程中，缺乏系统完善的水平井压裂参数优化方法，为此，基于动态反演理论，建立了压裂参数优化方法。首先，根据页岩油藏压裂后形成的复杂缝网，采用数值理论和离散裂缝方法，建立了考虑页岩油储层特征和复杂天然裂缝的多段压裂水平井数值模型（EDFM-NM），得到了含离散天然裂缝的油藏压力解及多段压裂水平井的井底压力数值解；然后，应用动态分析方法，建立了包括段间距、闷井时间和井距的优化方法。应用建立的优化方法对长庆页岩油XC井进行实例分析，结果表明，实例井合理段间距为100～125 m，合理闷井时间为25～35 d，合理井距为590～610 m。研究结果为长庆油田页岩油藏压–闷–采参数优化提供了理论基础。
- 页岩油 /
- 水平井 /
- 动态反演 /
- 参数优化 /
- 段间距 /
- 闷井时间 /
- 井距 /
- 长庆油田
Abstract: Regarding the absence of a systemic and complete method for optimizing the multi-stage fracturing parameters of horizontal wells in shale reservoirs during well fracturing-soaking-producing, a fracturing parameter optimization method was developed based on the dynamic inversion theory. First, a numerical model (EDFM-NM) for horizontal wells was established depending on the complex induced fracture networks formed in hydraulic fracturing of shale oil reservoirs, which takes into consideration the characteristics of the reservoirs as well as complex natural fractures. With the model, solution for the pressure of reservoirs with discrete natural fractures and numerical solution of bottom hole pressure of horizontal wells after multi-stage fracturing were obtained. Second, approaches for optimization of stage spacing, soaking time, and well spacing were proposed utilizing the dynamic analysis. Finally, the optimization method was applied to shale oil Well XC in Changqing Oilfield. Reasonable stage spacing, soaking time, and well spacing were found to be 100−125 m, 25−35 d, and 590−610 m, respectively. The research results can provide a theoretical basis for the optimization of fracturing parameters during “well fracturing–soaking–producing” of shale reservoirs in Changqing Oilfield.
- shale oil /
- horizontal well /
- dynamic inversion /
- parameter optimization /
- stage spacing /
- soaking time /
- well spacing /
- Changqing Oilfield

HTML全文

图 1 页岩油藏多段压裂水平井物理模型

Figure 1. Physical model of horizontal wells undergoing multi-stage fracturing in shale reservoirs

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图 2 全局坐标和裂缝局部坐标

Figure 2. Global coordinates and local coordinates of fractures

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图 3 单元连接方式示意图^[25]

Figure 3. Connection types of elements^[25]

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图 4 数学模型的数值结果

Figure 4. Numerical results of mathematical model

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图 5 页岩油多段压裂水平井模型可靠性验证

Figure 5. Reliability verification of model for horizontal wells undergoing multi-stage fracturing in shale reservoirs

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图 6 页岩油多段压裂水平井压–闷–采全周期参数优化方法

Figure 6. Multi-stage fracturing parameter optimization for horizontal wells in shale reservoirs during “well fracturing-soaking- producing”

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图 7 XC井多井模型示意图

Figure 7. Multi-well model of Well XC

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图 8 不同段间距下裂缝间的压力分布

Figure 8. Pressure distribution in induced fractures with different hydraulic fracture spacing

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图 9 不同段间距下的累计产油量

Figure 9. Cumulative oil production with different hydraulic fracture spacing

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图 10 合理闷井时间与缝网区渗透率的关系

Figure 10. Relationship between proper soaking time and permeability in fracture network area

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图 11 井距550 m时不同开采时间下的压力分布

Figure 11. Pressure distribution at different stage of production with well spacing of 550 m

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图 12 不同井距下的多井数值模型压力分布

Figure 12. Pressure distribution of multi-well numerical model with different well spacing

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图 13 不同井距下的年产油量

Figure 13. Annual oil production with different well spacing

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表 1 长庆油田长7页岩油XC井基础参数

Table 1. Basic model parameters of the Chang 7 shale oil well XC in Changqing Oilfield

区域	参数	数值
缝网区	裂缝半长/m	60
	裂缝导流能力/（mD·m）	30
	渗透率/mD	2.0
	导压系数/（cm²·s^–1）	0.056 1
	缝网体积比	0.05
	基质窜流系数	1.0×10^–6
受效区	半径/m	260
	渗透率/mD	0.1
	导压系数/（cm²·s^–1）	0.013 7
未改造区	渗透率/mD	0.01
未改造区	导压系数/（cm²·s^–1）	0.000 6
井筒	水平段长/m	1 500
	储集系数/（m³·MPa^–1）	0.23
	井筒半径/m	0.108
储层	有效厚度/m	14
	储层中深/m	2 100
	体积系数/（m³·m^–3）	1.192
	流体黏度/（mPa·s）	1.27
	综合压缩系数/MPa^–1	1.042×10^–3

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