Numerical investigation of fluid injection into poorly consolidated geomaterial considering shear dilation and compaction

Wu, Rong-Tsun; Deng, Jingen; Wei, Liu; Shaowen, Mao; Sun, Jie; Yan, Min; Li, Ming; Li, Yao

doi:10.1016/j.petrol.2018.05.006

Cited by 12 publications

(6 citation statements)

References 46 publications

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“…However, fluid and pore pressure migration were greatly influenced by permeability . It was inferred that the fracture dominated the process of fluid infusion due to the slow change rate in the stress field . Compared with the well‐understood natural fluid injection triggering earthquakes along a fault zone, the instability of intact rocks caused by injecting fluid needs further analysis.…”

Section: Discussionmentioning

confidence: 99%

“…58 It was inferred that the fracture dominated the process of fluid infusion due to the slow change rate in the stress field. 59,60 Compared with the well-understood natural fluid injection triggering earthquakes along a fault zone, 36 the instability of intact rocks caused by injecting fluid needs further analysis. Laboratory experiments conducted in this study indicated that the short-term failure triggered by hydraulic fracturing strongly depended on the stress state ( Figure 2).…”

Section: Discussionmentioning

confidence: 99%

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Short‐term failure mechanism triggered by hydraulic fracturing

Wang

Liu

2019

Energy Science & Engineering

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Hydraulic fracturing may induce or trigger an earthquake while injecting fluid into strata to initiate a new fracture so as to promote oil and gas production. Previous studies have confirmed that the injection of fluids into the formation, especially hydraulic fracturing, is closely related to seismic activity. However, the mechanism through which fluid injection changes the stress field of rock mass and interacts with the in situ stress state is still poorly understood. This study focused on the short‐term mechanism coupling shear stress and hydraulic fracturing in an experimental simulation. Preexisting tension fractures were initiated and propagated by loading shear force. The fracture propagation path of hydraulic fracturing was closely related to the preexisting fractures formed by the preshear stress. Short‐term hydraulic fracturing promoted fracture propagation and acoustic emission events (or microearthquake signals), but it was less likely to cause rock mass instability or a large earthquake. The long‐term fluid injection could saturate preexisting fractures and infiltrate rock mass to increase the pore pressure and change the in situ stress field in a large area to induce an earthquake.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Short‐term failure mechanism triggered by hydraulic fracturing

Wang

Liu

2019

Energy Science & Engineering

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“…The ABAQUS coupled pressure/deformation Cohesive Zone Model (CZM) is used to model the fracture propagation and the fracturing fluid flow. In this paper, the damage is assumed to initiate when the following quadratic stress criterion is fulfilled (Wu et al 2018): are respectively the partial derivative with respect to the time and the spatial coordinate; 𝑣 𝑡 and 𝑣 𝑏 respectively represent the normal velocities of the fluid flow through the top and the bottom faces of the fracture; 𝑞 𝑓 is the longitudinal flow rate per unit of width; 𝑤 is the fracture aperture.…”

Section: Theorymentioning

confidence: 99%

Numerical Investigation of the Effect of Swab and Surge Pressure on the Time-Dependent Wellbore’s Development of Natural Fractures

Lenwoue

et al. 2023

Preprint

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During drilling operations, the wellbore pressure is subjected to fluctuations caused by some factors such as swab and surge pressure which can result in wellbore instability. In this research, a numerical model is built using the ABAQUS software to demonstrate the effect of swab and surge pressure on the wellbore’s growth of natural fracture and the time dependent pore pressure. A MATLAB program is then developed to determine the safe mud window by computation of the time dependent wellbore collapse pressure and fracture pressure. The results demonstrated that the fracture width as a function of time profiles increased with the swab and surge pressure. The biggest percentage increase of the fracture width after incorporation of swab and surge pressure was 70%. Interestingly, an increase of 69% of the fracture width was observed in the near wellbore region after application of swab and surge pressure. However, the fracture length, the loss circulation rate and the pore fluid pressure remained relatively unchanged after integration of swab and surge. The analysis of the time-dependent wellbore stability revealed that the mud window, which was initially constant, narrowed with the time after integration of swab and surge pressure. The collapse pressure without swab and surge pressure increased by 14% while the fracture pressure decreased by 14%. The numerical model was verified by evaluating the gap between ABAQUS numerical results and analytical solutions and good consensus was observed after comparisons. The model developed in this research can be useful for wellbore strengthening studies to determine the optimal Particle Size Dimension necessary to plug the natural fractures and mitigate the lost circulation.

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“…The damage is assumed to be initiated when the stresses and/ or strains fulfill certain criteria. In this paper, the damage is assumed to be initiated when the following quadratic stress criterion is satisfied [21]:…”

Section: Traction Separation Lawmentioning

confidence: 99%

Numerical Investigation of the Influence of the Drill String Vibration Cyclic Loads on the Development of the Wellbore Natural Fracture

et al. 2021

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Wellbore instability is one of the most serious issues faced in the drilling process. During drilling operations, the cyclic loads applied on the fractured formation progressively modify the initial parameters (i.e., length and width) of the fractured formation, thus resulting into undesirable wellbore instability. In this paper, using a nonlinear finite element software (ABAQUS) as the numerical simulator, a poro-elasto-plastic model has been established which aimed at analyzing the influence of drill string vibration cyclic loads on the development of the wellbore natural fracture. The numerical results showed that the fracture width as a function of time profiles followed a sinusoidal behavior similar to the drill string vibration cyclic load profiles. For different cyclic load magnitudes with constant number of cyclic loads, the highest percentage increase of the fracture width after integration of cyclic loads was 64.77%. Interestingly, the fracture width increased with the fracture length in the near wellbore region while it globally decreased in the region far away from the wellbore. But for constant cyclic load magnitude with different number of cyclic loads, the biggest percentage increase of the fracture width after integration of cyclic loads was slightly lower representing 63.12% while the oscillating period of the fracture width increased with the number of cyclic loads. The parametric study revealed that the drill string vibration cyclic loads were relatively independent of the fracture length and the bottom hole pressure. However, the fracture width and the loss circulation rates were considerably impacted by the drill string vibration and the highest percentage increase of the loss circulation rate after integration of cyclic loads was 14.3%. This study provides an insight into the coupling of the fracture rock development and the continuous cyclic loads generated by drill string vibrations which is an aspect that has been rarely discussed in the literature.

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Numerical investigation of fluid injection into poorly consolidated geomaterial considering shear dilation and compaction

Cited by 12 publications

References 46 publications

Short‐term failure mechanism triggered by hydraulic fracturing

Short‐term failure mechanism triggered by hydraulic fracturing

Numerical Investigation of the Effect of Swab and Surge Pressure on the Time-Dependent Wellbore’s Development of Natural Fractures

Numerical Investigation of the Influence of the Drill String Vibration Cyclic Loads on the Development of the Wellbore Natural Fracture

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