The propagation mechanism of elastoplastic hydraulic fracture in deep reservoir
Jinbo Li1
Siwei Meng2
Suling Wang1
He Liu2
Kangxing Dong1
Qiuyu Lu3
1.School of Mechanics Science & Engineering,Northeast Petroleum University,Daqing,Heilongjiang,China2.PetroChina Research Institute of Petroleum Exploration &Development,Beijing,China;State Key Laboratory of Continental Shale Oil,Daqing,China3.Oil Production Engineering Research Institute in Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang,China
摘要：The oil and gas industry is increasingly focusing on exploring and developing resources in deep earth layers.At high tempera-tures,confining pressures,and geostress differences,rock has the mechanical characteristics of plastic enhancement,which leads to the unclear mechanism of hydraulic fracture expansion.The current fracturing model and construction design lack pertinence,and the fracturing reform is difficult to achieve the expected effect.This paper established a model of elastoplastic hydraulic fracture propagation in deep reservoirs.It considered the enhancement of plasticity by examining the elastoplastic deformation and nonlinear fracturing characteristics of the rock.The results confirmed that the hydraulic fractures in deep reservoirs propagated due to plastic energy dissipation after fracture tip passivation,while the stress concentration declined,which increased propagation resistance.The relationship between geology,engineering factors,degree of plasticity,and fracture propagation is discussed,while the conditions that promote fracture propagation are analyzed to provide theoretical support for deep reservoir fracturing design.
机标关键词：mechanismdeepelastoplasticfracturehydraulicpropagationreservoir
论文发表日期：2025-04-30
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：19( 68-86 )
英文信息