层理对侏罗系油藏水力裂缝扩展形态影响研究

doi:10.13809/j.cnki.cn32-1825/te.2024.06.012

Abstract

Abstract:

The Jurassic formations of the Ordos Basin, with burial depths ranging from 300 to 2,200 m, exhibit numerous horizontal bedding planes within the reservoirs, leading to complex variations in fracture morphology and propagation direction during hydraulic fracturing. Laboratory Brazilian splitting tests were conducted to evaluate the tensile strength of core samples from Jurassic formations, considering the impact of bedding. The tensile strength differences between specimens perpendicular to and parallel to bedding planes were compared. Based on the experimental data, a three-dimensional finite element model using the cohesive element method was developed to characterize hydraulic fracturing in multilayered Jurassic reservoirs, focusing on the effects of bedding strength and in-situ stress differences on fracture morphology and propagation paths. The results indicated that bedding strength and stress differences were the primary factors influencing fracture deflection. High bedding strength and large stress differences reduced the restraining effect of bedding on fractures, enhancing their vertical penetration across layers. Conversely, low bedding strength and small stress differences led to the opening of bedding planes, causing fractures to deviate and propagate along bedding surfaces. These findings provide guidance for optimizing hydraulic fracturing operations in Jurassic reservoirs.

Key words: Jurassic reservoirs, bedding structure, hydraulic fracturing, fracture morphology, finite element simulation

CLC Number:

TE319

YUAN Lina,WANG Guangtao,WANG Chengwang, et al. Study on influence of bedding on hydraulic fracture propagation morphologies in Jurassic reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 908-917.

Figures/Tables 13

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井号	垂直层理面抗拉强度/MPa	平行层理面抗拉强度/MPa
Q162	2.728	0.927
Y70	1.675	0.557
F136	4.557	2.715
F139	2.699	1.479
A237	3.771	1.064

类型	参数/单位	数值
岩石基质参数	弹性模量/GPa	25
	泊松比	0.25
	渗透率/10^-3μm²	10.2
	抗拉强度/MPa	1
	孔隙比	0.1
	饱和度	1
层理面参数	抗拉强度/MPa	1
	抗剪强度/MPa	6
	法向断裂能/（Pa·m）	1 000
	切向断裂能/（Pa·m）	6 000
	滤失系数/（m/s）	1×10^-11
应力场参数	垂向应力/MPa	25
	最大水平应力/MPa	20
	最小水平应力/MPa	15
注入参数	压裂液黏度/（mPa∙s）	1
	注入排量/（m³/min）	6
	注入时间/min	20

Study on influence of bedding on hydraulic fracture propagation morphologies in Jurassic reservoirs

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