Propagation of Hydraulic Fractures and Fracability Evaluation of Sandy Conglomerate Reservoirs

doi:10.7657/XJPG20230206

Abstract

Abstract:

In order to understand the propagation and extension of hydraulic fractures in the sandy conglomerate reservoirs of Permian Wuerhe formation，Junggar basin，the influences of gravel characteristics，in-situ stress，and other factors on the fracture propagation were studied by using the Realistic Failure Process Analysis (RFPA) software. According to the results of numerical simulation，the fracture propagation process under different conditions was studied，the evolution and shape of the fractures were described，and a model for evaluating the fracabilty of the sandy conglomerate reservoirs was established. The results show that the gravel strength and matrix strength of Wuerhe formation are quite different. The gravel strength ranges from 216.62 MPa to 2 032.64 MPa，which is 2-4 times of matrix strength. The rock mechanical properties of conglomerates differ significantly. When gravel content is small，fracture propagation is mainly affected by principal stress. When the grain size of gravel is small，fractures mainly extend bypassing the gravel. With the increase of grain size or gravel content，the inhibition and shielding effects of gravel on fractures become obvious，which reduces the extension of fractures. The greater the difference between gravel strength and matrix strength，the stronger the fractures are blocked by the gravel，and the more easily the fractures extend in the way of bypassing the gravel rather than penetrating the gravel，which reduces the extension of fractures. Based on grey relational analysis (GRA) and analytic hierarchy process (AHP)，a model for calculating the fracabilty evaluation coefficient of the sandy conglomerate reservoirs was established，which considers the factors such as gravel characteristics and horizontal in-situ stress. The fracabilty evaluation coefficient is positively correlated with dimensionless fracture area and fluid production index per meter.

Key words: Junggar basin, Wuerhe formation, gravel characteristic, hydraulic fracture, fracture propagation, fracabilty evaluation

CLC Number:

TE357.1

LIU Xiangjun, WANG Xiaojun, ZHAO Baowei, XIONG Jian, LIANG Lixi. Propagation of Hydraulic Fractures and Fracability Evaluation of Sandy Conglomerate Reservoirs[J]. Xinjiang Petroleum Geology, 2023, 44(2): 169-177.

Figures/Tables 13

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