正交节理与应力比值系数对水力裂缝扩展影响规律研究

doi:10.13809/j.cnki.cn32-1825/te.2020.05.008

Abstract

Abstract:

The joints in the stratum have a greater impact on the formation of complex fracture networks with hydraulic fractures. In order to study the propagation behavior of hydraulic fractures when they encounter orthogonal joints, the hydraulic fracturing of 3D orthogonal fractures is simulated based on the discrete element method, and the influence of the stress ratio coefficient k on the pressure and width of fractures is analyzed. The research results show that when the hydraulic fracture expands to the intersection of orthogonal joints, it will be hindered, so that the intersecting joint plane will slip and the fracture tip will be passivated, which will hinder the fracture expansion. Shear stress is the main factor that causes the obstruction. When the hydraulic fracture extends along the width direction, the shear stress changes and the hindrance decreases, so the crack can break through the hindrance and continues to extend. The extension direction is greatly affected by the value of k. When k is 0.8 and 1.0, vertical cracks extend through the horizontal joints and expand in the original direction. When k is 1.2, the vertical cracks will turn and expand along the horizontal joints. The maximum width of the hydraulic fracture and the pressure in the fracture are also greatly affected by the value of k. When k is 1.0, the maximum width of the fracture is stable, and the pressure in the fracture is unchanged. When k is 1.2, the hydraulic fracture expands along the horizontal joint after turning, the maximum width decreases, and the pressure in the fracture drops suddenly, and then gradually stabilizes. Whether the hydraulic fracture penetrates will affect the fracturing effect, a suitable stress ratio to control the direction of hydraulic fracture propagation can be chosen. Therefore, it can be a good guide for the determination of the shale hydraulic fracture propagation form and the formulation of the construction plan.

Key words: hydraulic crack, orthogonal jointing, stress ratio coefficient, obstruction, crack propagation, discrete element method

CLC Number:

TE357.1

Bohu ZHANG,Changman ZHOU,Yongxiang ZHENG, et al. Influence of orthogonal joint and stress ratio coefficients on hydraulic fracture propagation[J]. Reservoir Evaluation and Development, 2020, 10(5): 55-62.

Figures/Tables 10

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参数	取值	参数	取值
弹性模量/GPa	20	注入流体黏度/（Pa·s）	0.001 5
泊松比	0.25	注入流体密度/（kg·m^-3）	1 000
岩体密度/（kg·m^-3）	2 600	注入点埋深/m	3 000
节理面内摩擦角/（° ）	20	重力加速度/（m·s^-2）	9.81
节理面黏聚力/MPa	0	注入点竖向地应力/MPa	76.52

方案	p	σ_x=σ_y	σ_z	长边S_z	短边S_z
缝内压力p变化	70	75	75	-158.347	-104.652
	75	75	75	-74.999	-75
	80	75	75	8.347	-45.348
	85	75	75	91.694	-15.696
	90	75	75	175.042	13.956
竖向应力σ_z变化	82	75	60	307.216	77.231
	82	75	65	218.706	40.325
	82	75	70	130.196	3.419
	82	75	75	41.143	-35.547
	82	75	80	-46.824	-70.393
	82	75	85	-136.006	-106.315
	82	75	90	-223.844	-144.205

Influence of orthogonal joint and stress ratio coefficients on hydraulic fracture propagation

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