Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations  

作　　者：Peng Tan Zhao-Wei Chen Liu-Ke Huang Qing Zhao Sha-Rui Shao 

机构地区：[1]CNPC Engineering Technology R&D Company Limited,Beijing,102206,China [2]National Engineering Research Center for Oil&Gas Drilling and Completion Technology,Beijing,102206,China [3]School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu,610500,Sichuan,China [4]Shale Gas Research Institute,Southwest Oil&Gas Field Company,Chengdu,610500,Sichuan,China

出　　处：《Petroleum Science》2024年第5期3222-3236,共15页石油科学（英文版）

基　　金：the funding provided by the National Natural Science Foundation of China (No. 52334001, No. 42372337);National Key Research and Development Program of China (No. SQ2023YFE0100562);CPET Industrialization Fund Project (No. CPETCY202417);Natural Science Starting Project of SWPU (No. 2022QHZ009)。

摘　　要：Fracture geometry is important when stimulating low-permeability reservoirs for natural gas or oil production. The geological layer(GL) properties and contrasts in in-situ stress are the two most important parameters for determination of the vertical fracture growth extent and containment in layered rocks. However, the method for assessing the cumulative impact on growth in height remains ambiguous. In this research, a 3D model based on the cohesive zone method is used to simulate the evolution of hydraulic fracture(HF) height in layered reservoirs. The model incorporates fluid flow and elastic deformation, considering the friction between the contacting fracture surfaces and the interaction between fracture components. First, an analytical solution that was readily available was used to validate the model. Afterwards, a quantitative analysis was performed on the combined impacts of the layer interface strength, coefficient of interlayer stress difference, and coefficient of vertical stress difference.The results indicate that the observed fracture height geometries can be categorized into three distinct regions within the parametric space: blunted fracture, crossed fracture, and T-shaped fracture.Furthermore, the results explained the formation mechanism of the low fracture height in the deep shale reservoir of the Sichuan Basin, China, as well as the distinction between fracture network patterns in mid-depth and deep shale reservoirs.

关 键 词：Deep shale Hydraulic fracturing HF propagation Fracture interaction Cohesive zone method 

分 类 号：TE311[石油与天然气工程—油气田开发工程]