油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (3): 382-390.doi: 10.13809/j.cnki.cn32-1825/te.2024.03.008
陈学忠1(),赵慧言1,陈满1,徐华卿2,杨建英1,杨晓敏1,唐慧莹3()
收稿日期:
2023-08-29
出版日期:
2024-06-26
发布日期:
2024-07-10
通讯作者:
唐慧莹(1990—),女,博士,副教授,主要从事非常规储层压裂及一体化数值模拟研究。地址:四川省成都市新都区新都大道8号西南石油大学,邮政编码:610500。E-mail: 作者简介:
陈学忠(1968—),男,硕士,高级工程师,主要从事油气田开发管理工作。地址:四川省成都市成华区猛追湾横街99号,邮政编码:610051。E-mail: 基金资助:
CHEN Xuezhong1(),ZHAO Huiyan1,CHEN Man1,XU Huaqing2,YANG Jianying1,YANG Xiaomin1,TANG Huiying3()
Received:
2023-08-29
Online:
2024-06-26
Published:
2024-07-10
摘要:
由于沉积环境的不同,海陆过渡相页岩与海相页岩存在较大差异。基于鄂尔多斯盆地东缘海陆过渡相页岩储层的特点,建立了纵向多岩性叠置储层水平井产能数值模型,分析了不同岩性组合模式下的气井单段生产动态特征,研究了煤层渗透率、储层叠置关系等关键参数以及生产制度对生产特征的影响。研究结果表明:①富煤型页岩储层合层开采初期气水同产,采出气主要来自砂岩和页岩储层的游离气,采出水主要来自压裂液及煤层水。煤层的渗透率越高,合层开采的累计产气量越大,累计产水量也随之提升。②含煤叠置组合类型进行合层开采最理想的空间叠置顺序为页—砂—煤,在该叠置顺序下,煤层产水对合层开采干扰最小。③煤层产气量受应力敏感的影响最大。
中图分类号:
陈学忠, 赵慧言, 陈满, 徐华卿, 杨建英, 杨晓敏, 唐慧莹. 海陆过渡相页岩储层合层开采数值模拟研究[J]. 油气藏评价与开发, 2024, 14(3): 382-390.
CHEN Xuezhong, ZHAO Huiyan, CHEN Man, XU Huaqing, YANG Jianying, YANG Xiaomin, TANG Huiying. Numerical simulation of multi-layer co-production in marine-continental transitional shale reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 382-390.
表1
数值模拟模型基础参数"
数值模型参数 | 煤层 | 页岩层 | 致密砂岩层 |
---|---|---|---|
网格尺寸/m | 5×1×1 | 5×1×1 | 5×1×1 |
模型尺寸/m | 600×180×3 | 600×180×9 | 600×180×3 |
储层厚度/m | 3 | 9 | 3 |
基质孔隙度/% | 6 | 3 | 4 |
天然裂缝孔隙度/% | 1 | 1 | |
基质渗透率/10-3 μm2 | 0.1 | 0.001 | 0.01 |
天然裂缝渗透率/10-3 μm2 | 1 | 0.01 | |
兰氏体积/(m3/t) | 13.98 | 2.35 | |
兰氏压力/MPa | 2.3 | 3.6 | |
基质初始含水饱和度/% | 0 | 0 | 40 |
天然裂缝初始含水饱和度/% | 100 | 30 | |
水力裂缝开度/m | 0.01 | 0.01 | 0.01 |
水力裂缝渗透率/μm2 | 1 | 1 | 1 |
等效水力裂缝开度/m | 1 | 1 | 1 |
等效水力裂缝渗透率/μm2 | 0.01 | 0.01 | 0.01 |
等效水力裂缝孔隙度 | 0.01 | 0.01 | 0.01 |
表3
不同日产气量时的生产数据"
日产 气量/ m3 | 无应力敏感下 储层累计 产气量/104 m3 | 应力敏感下 储层累计 产气量/104 m3 | 累计产气量 下降值/ 104 m3 | 累计产气量 下降率/ % |
---|---|---|---|---|
3 000 | 119.14 | 107.31 | 11.84 | 9.94 |
4 000 | 123.40 | 109.93 | 13.47 | 10.92 |
5 000 | 125.19 | 111.07 | 14.12 | 11.28 |
6 000 | 126.15 | 111.68 | 14.47 | 11.47 |
7 000 | 126.66 | 112.04 | 14.62 | 11.54 |
8 000 | 126.97 | 112.26 | 14.71 | 11.59 |
9 000 | 127.24 | 112.44 | 14.80 | 11.63 |
表5
不同日产气量下储层应力敏感对页岩层累计产气量影响"
日产 气量/ m3 | 无应力敏感下 储层累计产气量/104 m3 | 应力敏感下储层累计产气量/104 m3 | 累计产气量 下降值/ 104 m3 | 累计产气量 下降率/ % |
---|---|---|---|---|
3 000 | 14.98 | 14.65 | 0.32 | 2.16 |
4 000 | 15.22 | 14.80 | 0.43 | 2.82 |
5 000 | 15.35 | 14.87 | 0.48 | 3.15 |
6 000 | 15.42 | 14.91 | 0.51 | 3.33 |
7 000 | 15.46 | 14.93 | 0.53 | 3.44 |
8 000 | 15.49 | 14.95 | 0.54 | 3.51 |
9 000 | 15.51 | 14.96 | 0.55 | 3.56 |
表6
不同日产气量下储层应力敏感对致密砂岩层累计产气量影响"
日产 气量/ m3 | 无应力敏感下 储层累计产气量/104 m3 | 应力敏感下储层累计产气量/104 m3 | 累计产气量 下降值/ 104 m3 | 累计产气量 下降率/ % |
---|---|---|---|---|
3 000 | 95.64 | 86.68 | 8.96 | 9.37 |
4 000 | 98.67 | 88.71 | 9.97 | 10.10 |
5 000 | 99.91 | 89.57 | 10.34 | 10.35 |
6 000 | 100.56 | 90.02 | 10.54 | 10.48 |
7 000 | 100.90 | 90.29 | 10.61 | 10.51 |
8 000 | 101.11 | 90.46 | 10.65 | 10.54 |
9 000 | 101.30 | 90.59 | 10.71 | 10.57 |
表7
不同日产气量下储层应力敏感对储层累计产水量影响"
日产 气量/ m3 | 无应力敏感下 储层累计产水量/m3 | 应力敏感下储层累计产水量/ m3 | 累计产水量 下降值/ m3 | 累计产水量 下降率/ % |
---|---|---|---|---|
3 000 | 277.65 | 209.67 | 67.97 | 24.48 |
4 000 | 283.30 | 207.28 | 76.03 | 26.84 |
5 000 | 285.71 | 205.06 | 80.66 | 28.23 |
6 000 | 286.99 | 203.32 | 83.67 | 29.15 |
7 000 | 287.63 | 201.83 | 85.80 | 29.83 |
8 000 | 287.97 | 200.62 | 87.34 | 30.33 |
9 000 | 288.33 | 199.60 | 88.73 | 30.77 |
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