Geomechanical key parameters of the process of hydraulic fracturing propagation in fractured medium

Basirat, Rouhollah; Goshtasbi, Kamran; Ahmadi, Morteza

doi:10.2516/ogst/2019026

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…Several numerical methods has been developed to simulate dry fracture in solids. The most extended models include the Displacement Discontinuity Method (DDM), 12–14 the Discrete Element Method (DEM) 15–17 and the Finite Element Method (FEM). The general formulation of the FEM allows to incorporate fractures using different approaches and methodologies.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic fracture propagation barriers induced by weak interfaces in anisotropic rocks

Celleri¹,

Sánchez²

2021

Num Anal Meth Geomechanics

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In the Oil&Gas industry, hydraulic fracturing is a technique that makes unconventional reservoirs economically viable. Despite the high impact of the stimulation processes on the productivity of the wells, hydraulic fractures are modeled assuming vertical and planar propagation in most cases. In Argentina, Vaca Muerta formation is the most important unconventional reservoir. It is predominately in a strike‐slip stress regime with areas in thrust regime, and has also strong elastic anisotropy with widely spread sub‐horizontal mechanical discontinuities such as calcitic veins or ash beds, that could act as preferential propagation paths. The effect of these heterogeneities on the fracture propagation, typically underestimated, is a key issue to model the hydraulic fracture geometry, to estimate the stimulated volume, and to optimize production under these complex mechanical conditions. In this work, we use a coupled fluid ‐ rock mechanics model that accounts for elastic anisotropy and weak discontinuities to study the fracture height growth. Fracture initiation and propagation are modeled using a Discontinuous Galerkin (DG) finite elements formulation with a softening Cohesive Zone Model (CZM). We analyze Vaca Muerta formation representative mechanical properties and provide some fundamentals on typical field problems like vertical containment induced by lamination and layering or horizontal fracture propagation with their consequent loss of productivity. We find, for typical Vaca Muerta formation conditions, that not only the weak bedding strength controls the height propagation of the hydraulic fracture but also the degree of anisotropy plays an important role under harsh stress regimes and high heterogeneity of the formation.

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Section: Introductionmentioning

confidence: 99%

Hydraulic fracture propagation barriers induced by weak interfaces in anisotropic rocks

Celleri¹,

Sánchez²

2021

Num Anal Meth Geomechanics

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“…Today, the oil and gas industry are actively developing and improving the classical [64][65][66] and developing and testing new technologies to increase the productivity of wells [2,67,68]. Each of these technologies has its advantages and disadvantages, as well as economically feasible applications [1,66].…”

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confidence: 99%

A Technology of Hydrocarbon Fluid Production Intensification by Productive Stratum Drainage Zone Reaming

et al. 2021

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The paper proposes a new technology for fluid production intensification, in particular hydrocarbons, which is implemented via significant increasing of the local wellbore diameter in the interval, where the productive stratum is present. The proposed technology improves the well productivity by increasing the filtration surface area and opening new channels for filtering fluids into the well. The innovative, technical idea is to drill large diameter circular recesses in planes perpendicular to the well axis. After that, the rock mass located between the circular recesses are destroyed by applying static or dynamic axial loads. The required value of the axial force is provided by the weight of the standard drilling tool. As a result of the study, the analytical relations to specify the admissible radius of circular recesses and admissible thickness of rock mass between two adjacent circular recesses from the condition of safe operation are obtained. The numerical analysis carried out for typical reservoir rocks substantiated the possibility of well diameter local reaming twenty times. A special tool for circular recess drilling is developed and the principle of its operation is described. The advantage of the proposed approaches is the low energy consumption for well diameter reaming. Our technology will have special economic expediency for the intensification of production from hydrodynamically imperfect wells and under the condition of fluid filtration according to the expressed nonlinear law.

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Estimation of In-Situ Stress Ratio Based on the Monitoring Results of Convergence Meter

Basirat

Hassani

2023

Geotech Geol Eng

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Geomechanical key parameters of the process of hydraulic fracturing propagation in fractured medium

Cited by 7 publications

References 55 publications

Hydraulic fracture propagation barriers induced by weak interfaces in anisotropic rocks

Hydraulic fracture propagation barriers induced by weak interfaces in anisotropic rocks

A Technology of Hydrocarbon Fluid Production Intensification by Productive Stratum Drainage Zone Reaming

Estimation of In-Situ Stress Ratio Based on the Monitoring Results of Convergence Meter

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