基于地质工程一体化的致密油井间干扰分析及井间距优化

任佳伟; 白晓虎; 唐思睿; 陈军斌; 董奇; 余金柱

doi:10.19509/j.cnki.dzkq.tb20230631

基于地质工程一体化的致密油井间干扰分析及井间距优化

doi: 10.19509/j.cnki.dzkq.tb20230631

任佳伟^{1, 2a,},
白晓虎^{2a, 3},
唐思睿^2b,
陈军斌^1, ,,
董奇^{2a, 3},
余金柱^{2a, 3}

1.
西安石油大学石油工程学院, 西安 710065
2a.
中国石油长庆油田分公司油气工艺研究院, 西安 710018
2b.
中国石油长庆油田分公司油田开发事业部, 西安 710018
3.
低渗透油气田勘探开发国家工程实验室, 西安 710018

基金项目:

国家自然科学基金项目"陆相页岩油储层密切割体积压裂缝网演化机理及有效性评价研究" 52274040

中国石油天然气股份有限公司重大科技专项"特低渗/致密油转变开发方式关键技术研究" 2023ZZ17YJ03

中国石油天然气股份有限公司重大科技专项"水平井井筒重构重复压裂技术与试验" 2023ZZ28YJ07

详细信息

作者简介:
任佳伟, E-mail: rjw_cq@petrochina.com.cn

通讯作者:
CHEN Junbin, E-mail: chenjbxu@126.com

中图分类号: P618.13;P631.8
计量
- 文章访问数: 49
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-08
- 录用日期: 2024-07-17
- 修回日期: 2024-01-09

Interwell interference analysis and well spacing optimization of tight oil wells based on geological engineering integration

REN Jiawei^{1, 2a
,},
BAI Xiaohu^{2a, 3},
TANG Sirui^2b,
CHEN Junbin^{1
, ,},
DONG Qi^{2a, 3},
YU Jinzhu^{2a, 3}

1.
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China
2a.
Oil & Gas Technology Research InstitutePetroChina Changqing Oilfield Company, Xi'an 710018, China
2b.
Oilfield Development Division, PetroChina Changqing Oilfield Company, Xi'an 710018, China
3.
National Engineering Laboratory of Low Permeability Oil and Gas Field Exploration and Development, Xi'an 710018, China

More Information

Author Bio:
REN Jiawei, E-mail: rjw_cq@petrochina.com.cn

摘要

摘要:
随着新井加密以及老井重复压裂的实施, 井间距缩小、单井改造规模扩大, 井间干扰程度高, 严重影响压裂效果及产量。为解决井间干扰程度评价及预防控制等问题, 应用地质工程一体化模拟技术, 综合利用三维位移不连续裂缝扩展方法及嵌入式离散裂缝技术, 建立水平井组地质工程一体化模拟模型, 评价单井及井组压裂改造后动用范围, 开展井间干扰程度影响因素分析。结果表明: (1)基质渗透率高于0.3×10^-3 μm²、裂缝半长大于100 m、裂缝间距小于40 m, 压裂改造范围明显变大, 井间干扰程度越明显; (2)随着井间距增加, 井间干扰程度不断变弱, 当井间距增加到400 m时, 井间干扰对单井最终可采储量(EUR)的影响可以忽略; (3)当井间距大于400m时, 井组累计产油量降低幅度变大, 需要优化合理井间距来平衡区块采收率和单井累计产油量的关系。研究结果可为井距优化及重复压裂技术应用提供有效指导。
- 致密油藏 /
- 水平井 /
- 地质工程一体化 /
- 井间干扰 /
- 井间距优化
Abstract: <p>With the implementation of infilling new wells and refracturing existing ones, the spacing between wells has decreased, the scale of stimulation for individual wells has expanded, and the level of interference among wells has heightened, significantly impacting fracturing effectiveness and production.</p></sec><sec><title>Objective
Addresses issues related to evaluating and preventing interference between wells,
Methods
based on an integrated geological engineering workflow, 3D DDM and EDFM technologies have been comprehensively used to establish an integrated geological engineering simulation model for horizontal well groups. Then, the operating range of single wells and well groups following fracturing stimulation was evaluated, and factors affecting the degree of interference between wells were analysed.
Results
The findings indicate that (1) when the matrix permeability exceeds 0.3×10^-3 μm², the half-length of fractures is greater than 100 m, and the spacing between fractures is less than 40 m, a largerrange of fracturing transformation correlates with an increased degree of interwell interference. (2) As the well spacing increases, the degree of interwell interference diminishes. At a spacing of 400 m, the impact of interwell interference on a single well's EUR can be ignored. (3) It is essential to balance the relationship between the block recovery rate and cumulative production of a single well by optimizing and determining appropriate well spacing.
Conclusion
The above research results can provide valuable insights for optimizing well spacing and enhancing the effectiveness of repeated fracturing technology.
- tight oil reservoir /
- horizontal well /
- geological engineering integration /
- interwell interference /
- well spacing optimization
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 地质工程一体化工作流程

3D-DDM.三维位移不连续裂缝扩展方法; EDFM.嵌入式离散裂缝模型; ZFRAC.复杂缝网压裂模拟一体化软件; ZFRAC-AI.ZFRAC软件智能拟合模块

Figure 1. Whole workflow of geological engineering intergration

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图 2 目标区块三维地质力学模型

Figure 2. Three-dimensional geomechanical model of the target region

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图 3 油藏地质模型示意图

Figure 3. Reservoir geological model map

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图 4 压裂液注入及返排过程中地层压力(a~c)及饱和度场(d~f)变化情况

Figure 4. Changes in formation pressure(a~c) and saturation fields(d~f) during the injection and flowback process of fracturing fluid

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图 5 水平井产能数值模拟结果与实际生产数据历史拟合曲线

Figure 5. History fitting curve between the simulation result and the actual production data of horizontal well

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图 6 初次压裂后不同生产时间地层压力云图

Figure 6. Formation pressure programs at different production times after initial fracturing

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图 7 井网压力传递规律时态分析

Figure 7. Temporal analysis of pressure transmission law in well network

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图 8 不同基质渗透率(k)下储层压力变化图

Figure 8. Reservoir pressure variation diagram under different matrix permeability

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图 9 天然裂缝建模流程及量化表征

L_fD为线性裂缝密度，条/m; L_B为垂直于流动方向的直线长度，m; n_f为与L_B直线相交的裂缝数目，条

Figure 9. Natural fracture modeling process and quantitative characterization

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图 10 不同天然裂缝渗透率下储层压力变化图

Figure 10. Reservoir pressure variation diagram under different natural fracture permeability

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图 11 不同裂缝半长下储层压力变化图

Figure 11. Reservoir pressure variation diagram under different fracture half-length

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图 12 不同裂缝导流能力下储层压力变化图

Figure 12. Reservoir pressure variation diagram under different fracture concluctivity

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图 13 不同裂缝间距下储层压力变化图

Figure 13. Reservoir pressure variation diagram under different fracture spacing

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图 14 不同井间距下储层压力变化图

Figure 14. Reservoir pressure variation diagram under different well spacing

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图 15 不同井间距条件下单井产能模拟对比(a)和单井及井组产能对比(b)

Figure 15. Comparison of single well productivity simulation under different well spacing conditions

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表 1 地质模型基本参数

Table 1. Geological model parameters

属性	数值	属性	数值
有效厚度/m	18	含油饱和度/%	54.2
油藏埋深/m	1 520	原油黏度/(mPa·s)	7.3
平均孔隙度	0.09	原始地层压力/MPa	15.8
平均渗透率/(10^-3μm²)	0.82	原油饱和压力/MPa	5.6

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