致密砂岩气藏暂堵压裂裂缝起裂扩展实验模拟

doi:10.13809/j.cnki.cn32-1825/te.2024.03.009

Abstract

Abstract:

This study addresses the challenges presented by the reservoirs in He-8 member in SD block of Ordos Basin, characterized by low porosity, low permeability, strong heterogeneity, and conventional fracturing fracture shapes. Utilizing fracture mechanics, this research examines the interactions between temporarily blocked fractures and the initial fracture throughout their entire contact period. Key considerations include fluid pressure drop within the fracture and the rock mechanics parameters of the reservoirs in He-8 member. The study systematically analyzes the influence of various parameters such as fracture strike, well deviation angle, and azimuth angle on fracturing fracture parameters. Notable findings include: Fracturing pressure decreases with increasing well deviation angle and azimuth angle. The initiation angle diminishes as well inclination increases, reaching a nadir before decreasing further with azimuth angle adjustments. Using artificial cement samples and a large-scale experimental system with realistic triaxial physical models, the study simulates the initiation, turning, and propagation behaviors of new fractures in temporary plugging fracturing. The behaviors of initiation, steering and extension of newly formed fractures at different well inclination and azimuth angles were evaluated along with the parameters such as fracture initiation pressure and fracture stimulated area. The experimental results reveal: Both initial and secondary fracture pressures tend to decrease as well inclination increases, making fractures more prone to turning and significantly enlarging the modifiable area. With consistent trap inclination, fracture initiation pressure decreases and the fracture modification area expands as bore azimuth increases. Fractures resulting from azimuthal 90° spiral perforation exhibit greater complexity compared to those from azimuthal 0° spiral perforation. Additionally, fixed surface perforation techniques can regulate fracture pressure and the initial fracture positions in horizontal wells, recommending a perforation angle between 75° and 90°. These findings offer valuable insights for the design of temporary plugs and fracturing strategies in low-permeability tight sandstone oil and gas reservoirs.

Key words: true triaxial, temporary plugging fracturing, fracture initiation and morphology, breakdown pressure, fracturing angle, fracture stimulation surface area

CLC Number:

TE357

KONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang. Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing[J].Petroleum Reservoir Evaluation and Development, 2024, 14(3): 391-401.

Figures/Tables 17

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References 42

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井号	岩性	井深/m	密度/ （g/cm³）	围压/ MPa	抗压强度/ MPa	弹性模量/ GPa	泊松比	黏聚力/ MPa	内摩擦角/ （° ）
SD-A	灰色砂岩	3 078.35 ~ 3 078.50	2.51	0	29.021	12.405 3	0.215	6.66	40.70
SD-A	灰色砂岩	3 078.35 ~ 3 078.50	2.51	15	100.260	14.105 2	0.205	6.66	40.70
SD-B	灰色细砂岩	2 911.89~2 911.99	2.64	0	117.394	23.730 9	0.132	30.69	34.80
SD-B	灰色细砂岩	2 911.89~2 911.99	2.65	15	172.275	27.224 2	0.195	30.69	34.80
SD-C	灰色砂岩	3 000.50~3 000.80	2.48	0	39.564	12.281 0	0.176	7.51	40.44
SD-C	灰色砂岩	3 000.50~3 000.80	2.52	15	143.732	21.041 2	0.186	7.51	40.44
SD-D	灰色砂岩	3 120.39~3 120.49	2.54	0	30.040	11.931 5	0.218	6.59	42.65
SD-D	灰色砂岩	3 120.39~3 120.49	2.56	15	108.070	14.384 0	0.198	6.59	42.65
		平均值			92.545	17.137 9	0.191	12.86	39.65

序号	抗压强度/MPa	抗拉强度/MPa
试样1	93.60	8.12
试样2	89.80	7.23
试样3	96.52	9.35
试样4	87.81	5.63
试样5	88.58	5.24
试样6	92.12	9.21

组别	序号	井斜角/方位角	模拟地应力（σ_H/σ_h/σ_v）/MPa	泵注排量/（mL/min）	备注
一	试样1	0°/0°	55.80/47.75/66.84	5 mL/min上升到10 mL/min （泵注暂堵剂）	切换泵注排量前加注暂堵剂实施暂堵
	试样2	45°/0°	55.80/47.75/66.84
	试样3	90°/0°	55.80/47.75/66.84
二	试样4	0°/90°	55.80/47.75/66.84	5 mL/min上升到10 mL/min （泵注暂堵剂）	切换泵注排量前加注暂堵剂实施暂堵
	试样5	45°/90°	55.80/47.75/66.84
	试样6	90°/90°	55.80/47.75/66.84

序号	井斜角/ 方位角	初次压裂裂缝参数			二次起裂裂缝参数
序号	井斜角/ 方位角	泵注排量/ （mL/min）	泵压峰值/ MPa	裂缝改造面积/ cm²	泵注排量/ （mL/min）	泵压峰值/ MPa	裂缝改造面积/ cm²
试样1	0°/0°	5.0	56.0	1 053.83	10.0	62.0	972.23
试样2	45°/0°		54.2	1 238.81		59.0	1 167.58
试样3	90°/0°		52.3	1 609.61		57.0	1 442.43
试样4	0°/90°		50.9	1 102.37		57.0	1 093.45
试样5	45°/90°		45.7	1 365.13		55.1	1 294.31
试样6	90°/90°		41.3	1 782.93		49.9	1 532.22

Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing

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