Modeling of near-wellbore fracturing for wellbore strengthening

Zhong, Ruizhi; Miska, Stefan; Yu, Mengjiao

doi:10.1016/j.jngse.2017.01.009

Cited by 36 publications

(3 citation statements)

References 24 publications

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“…Recently, we developed a numerical model to estimate the near-wellbore fracture geometry for wellbore strengthening (Zhong et al 2017b;Zhong et al 2018). The numerical model is based on the fracture mechanics (Warren 1982;Carbonell and Detournay 1995;Shahri et al 2014) and couples the fluid flow.…”

Section: Evaluation Of a Numerical Model Using Experimental Resultsmentioning

confidence: 99%

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

Zhong

Miska

et al. 2019

Journal of Petroleum Science and Engineering

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Section: Evaluation Of a Numerical Model Using Experimental Resultsmentioning

confidence: 99%

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

Zhong

Miska

et al. 2019

Journal of Petroleum Science and Engineering

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“…Therefore, a new method is needed to handle stress anisotropy for calculating the fracture width. Some research has been conducted considering the stress anisotropy (Guo et al 2011;Marita and Fuh 2012;Shahri et al 2015;Mehrabian and Jamison 2015;Zhong et al 2017). However, there is no commonly used analytical method to handle the stress anisotropy; therefore, a numerical method is required to model the fracture width.…”

Section: Semi-analytical Solution Accounting For Stress Anisotropymentioning

confidence: 99%

A three-dimensional solution of hydraulic fracture width for wellbore strengthening applications

Zhang

Yin

2019

Pet. Sci.

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Determining the width of an induced hydraulic fracture is the first step for applying wellbore strengthening and hydraulic fracturing techniques. However, current 2-D analytical solutions obtained from the plane strain assumption may have large uncertainties when the fracture height is small. To solve this problem, a 3-D finite element method (FEM) is used to model wellbore strengthening and calculate the fracture width. Comparisons show that the 2-D plane strain solution is the asymptote of the 3-D FEM solution. Therefore, the 2-D solution may overestimate the fracture width. This indicates that the 2-D solution may not be applicable in 3-D conditions. Based on the FEM modeling, a new 3-D semi-analytical solution for determining the fracture width is proposed, which accounts for the effects of 3-D fracture dimensions, stress anisotropy and borehole inclination. Compared to the 2-D solution, this new 3-D semi-analytical solution predicts a smaller fracture width. This implies that the 2-D-based old design for wellbore strengthening may overestimate the fracture width, which can be reduced using the proposed 3-D solution. It also allows an easy way to calculate the fracture width in complex geometrical and geological conditions. This solution has been verified against 3-D finite element calculations for field applications.

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“…However, these studies do not take into account the effects of time and fluid flow to cause pressure changes in the fracture during fracture propagation. Zhong et al (2017), (Zhong et al, 2018) considered the influence of drilling time on fracture propagation but believed that fluid pressure drop in fractures was too small to be ignored. Pressure exchange between fractures and formation also greatly affected fracture propagation.…”

Section: Introductionmentioning

confidence: 99%

Geomechanical analysis of lost circulation control in tight formations

Ma,

Wan,

Hou

et al. 2024

Front. Earth Sci.

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Unconventional oil and gas reservoirs, especially that in tight formations, contribute great parts to the global energy. During drilling in tight formations, lost circulation was one of the major problems, which can cause large amount of non operation time and millions of losses. In order to migrate the problem, lost circulation materials (LCMs) were used to prevent reopening of the fracture by isolating the fracture tip while the calculation of stress intensity factor (SIF) and fracture width is the key to LCMs design. In this paper, a dual porosity medium flow model suitable for tight formation is established to calculate the pressure distribution in fracture, and the fracture width and fracture reopening pressure (FROP) is then calculated by using the semi-analytical fracture mechanics model. Sensitivity analysis of critical parameters, for example, fracture length, wellbore radius, LCMs permeability, viscosity, wellbore pressure, and two rock-mechanics-related properties are implemented. The fracture width is larger in the formation with large horizontal principal stress anisotropy, low Young’s modulus and Poisson’s ratio. The increase in fracture length, wellbore radius and wellbore pressure also contributes to fracture opening. Meanwhile, we compared the situation before and after fracture plugging and the results emphasize that the fracture reopening is less likely to occur under the conditions of high viscosity and low permeability LCMs. The method proposed in this study can be used to calculate fracture width and FROP, which has potential significant application for lost circulation control in tight formation.

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Modeling of near-wellbore fracturing for wellbore strengthening

Cited by 36 publications

References 24 publications

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

A three-dimensional solution of hydraulic fracture width for wellbore strengthening applications

Geomechanical analysis of lost circulation control in tight formations

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