深层煤层水平井压裂动态应力场研究——以鄂尔多斯盆地大宁—吉县区块为例

doi:10.13809/j.cnki.cn32-1825/te.2025.02.016

Abstract

Abstract:

China’s deep coalbed methane demonstration base has been preliminarily established and is gradually entering an important stage of large-scale exploration and development. This breakthrough has brought new opportunities and challenges to the energy sector. With ongoing development, traditional 3D static models have proven inadequate for predicting the dynamic in-situ stress evolution of coupled seepage-stress interaction in strongly heterogeneous reservoirs under large-scale horizontal well fracturing conditions. In response, this study takes the deep coalbed methane reservoir in the Daning-Jixian block as an example to conduct in-depth investigation of the dynamic stress field during reservoir fracturing. This study adopts an integrated geological engineering fracture network model for coalbed methane reservoirs to simulate the horizontal well platform fracturing process, comprehensively considering both geological conditions and engineering factors, thereby more accurately reflecting the actual situation. A time-dependent simulation study of the dynamic stress field during large-scale fracturing for horizontal well platform S was carried out. The results indicate that after multiple rounds of fracturing-induced stress superposition, the present in-situ stress distribution has undergone significant alterations. In order to quantify this impact, a key indicator—the horizontal principal stress difference coefficient, defined as the ratio of the two horizontal principal stresses—was introduced. When this coefficient approaches 1, it indicates an optimal fracturing effect. The simulation results show that the range of the horizontal principal stress difference coefficient in the post-fracturing area gradually decreases from 1.15-1.25 to 1.05-1.15, with most areas around the well exhibiting a value of less than 1.10, demonstrating that the large-scale fracturing in horizontal wells is effective. This research achievement not only provides a more reasonable simulation method for the large-scale fracturing development of deep coalbed methane, but also offers a scientific basis for optimizing fracturing design and improving coalbed methane recovery. Through an integrated geological engineering method, it is possible to more accurately predict and assess the dynamic stress field changes during the fracturing process, thereby guiding the fracturing operations in actual production.

Key words: deep coalbed methane, large-scale fracturing, dynamic in-situ stress, horizontal well, stress field study

CLC Number:

TE348

ZHAO Haifeng,WANG Chengwang,XI Yue, et al. Study on dynamic stress field of fracturing in horizontal wells of deep coal seams: A case study of Daning-Jixian block in Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(2): 310-323.

Figures/Tables 20

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名称	埋深/m	厚度/m	含气量/（m³/t）	孔隙度/%	渗透率/10^-3 μm²	储层压力/MPa	储层温度/℃	镜质体反射率/%
中浅层8号煤	900~1 500	2.2~9.4	6.14~20.84	3.98	0.005~3.010	7.65	30.50~51.19	2.2
深层8号煤	2 000~2 400	4.0~12.0	18.00~27.00	3.13	0.053~0.054	20.00	61.30~73.40	2.7

井号	垂向应力/MPa	最大水平主应力/MPa	最小水平主应力/MPa	弹性模量/GPa	静态泊松比	地应力方位/（°）
D1	48.75	45.41	36.93	4.99	0.37	112.85
D2	50.40	47.38	40.13	5.73	0.38	99.25
D3	49.30	47.08	40.22	5.75	0.44	44.44
D4	50.69	46.11	41.11	5.98	0.40	91.12

S-4井段	裂缝总长/m	裂缝总长模拟值/m	裂缝高/m	裂缝高度模拟值/m	裂缝走向/（°）	裂缝走向模拟值/（°）
第2段	354	374	26	28	北东66	北东86
第3段	466	419	23	28	北东65	北东81
第4段	573	451	29	29	北东76	北东77
第5段	593	431	27	29	北东77	北东74
第6段	480	330	30	31	北东66	北东73
第7段	413	343	26	31	北东75	北东75
第8段	487	403	29	32	北东69	北东76
第9段	359	361	28	34	北东77	北东77
第10段	479	385	31	35	北东69	北东77
第11段	553	392	34	34	北东76	北东76

Study on dynamic stress field of fracturing in horizontal wells of deep coal seams: A case study of Daning-Jixian block in Ordos Basin

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