Parameter Studies on Hydraulic Fracturing in Brittle Rocks Based on a Modified Hydromechanical Coupling Model

被引:2
|
作者
Zhang, Yulong [1 ]
Zhang, Yiping [1 ]
Han, Bei [2 ]
Zhang, Xin [3 ]
Jia, Yun [4 ]
机构
[1] Hohai Univ, Coll Civil & Transportat Engn, Nanjing 210098, Peoples R China
[2] Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
[3] Shandong Jianzhu Univ, Coll Civil Engn, Jinan 250101, Peoples R China
[4] Univ Lille, Lab Mech Lille, F-59650 Villeneuve Dascq, France
基金
中国博士后科学基金;
关键词
hydraulic fracturing; in situ stress; fluid injection rate; fluid viscosity; discrete element method; particle flow simulation; BONDED-PARTICLE MODEL; STRESS ESTIMATION; ANISOTROPIC ROCK; FLUID; PROPAGATION; INITIATION; ENERGY; DEFORMATION; SIMULATION; INJECTION;
D O I
10.3390/en15072687
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In this paper, we present a numerical study of hydraulic fracturing in brittle rock by using particle flow simulation. The emphasis is put on the influence of in situ stress, differential stress, fluid injection rate, fluid viscosity and borehole size on hydraulic fracturing behavior. To this end, an improved hydromechanical coupling model is first introduced to better describe fluid flow and local deformation of particle-based rocks. A series of parameter sensitivity studies are then conducted under the framework of particle flow simulation. Modelling results suggest that the breakdown pressure and time to fracture both linearly increase with confining stress, and hydraulic fracturing patterns present a distinct transition from brittle to ductile. Fluid injection rate and fluid viscosity have similar influences on hydraulic fracturing propagation, their value decrease leads to borehole pressure decrement and time to fracture prolongation. However, the former mainly controls the time to initial cracking, while the latter largely decides the duration of fracturing propagation. As for borehole radius, its increases can directly enhance the fluid diffusion zone, which further intensifies the nonlinear property of borehole pressure, leads to breakdown pressure decrease, prolongs time to fracture and forms more complex hydraulic fractures.
引用
收藏
页数:19
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