Modeling of hydraulic fracturing in ultra-low permeability formations: The role of pore fluid cavitation

Kumar, Sandeep; Zielonka, Matias G.; Searles, K.; Dasari, G. R.

doi:10.1016/j.engfracmech.2017.08.020

Cited by 14 publications

(2 citation statements)

References 29 publications

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“…Although hydraulic fracturing simulation in rock and soil mass is a very difficult problem, there are many numerical methods for hydraulic fracturing simulation due to high attention. Simulation of the hydraulic fracturing process usually involves four processes: (i) mechanical deformation, induced by fluid pressure on fracture surfaces, (ii) fluid flow within the fracture, (iii) fracture propagation, and (iv) coupling of seepage and stress in the computational domain around the fracture [23]. At present, algorithms related to hydraulic fracturing or fracture propagation can be mainly divided into the following categories: the finite element method (FEM) [24], the extended finite element method (XFEM) [25], the discrete element method (DEM) [26], the displacement discontinuity method (DDM) [27], the boundary element method (BEM) [28], etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Slurry Fracturing during Shield Tunneling under a Reservoir

et al. 2022

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The Jinan Jiluo Road Crossing the Yellow River Tunnel North Extension Project will intersect the Queshan reservoir, which currently supplies 60% of the domestic water in Jinan City. During the excavation process of the large-diameter slurry type shield used in this project, it may lead to slurry fracturing of the stratum in front of the excavation face and slurry blow-out from the surface if the slurry support pressure is too high. The leakage of shield slurry will pollute the reservoir water, and the safety of domestic water in Jinan will be threatened. Shield slurry blow-out may also lead to water inrush accidents. It is difficult to prevent slurry blow-out during shallow shield tunnel construction due to an insufficient understanding of the shield slurry fracturing mechanism. The initiation and extension of shield slurry fracturing are very complex and difficult to observe in the stratum. Currently, there is no effective method to study the slurry fracturing mechanism of shield tunneling. This paper presents a numerical simulation method of shield tunneling slurry fracturing based on the extended finite element method (XFEM). The risk of slurry blow-out in shield tunnel crossing reservoir engineering is analyzed. The advantages of the XFEM for simulating crack propagation are fully exploited. Considering the coexistence of tensile and shear failures in soft soils, embedding the combined tensile and shear failure criterion is realized in the XFEM by the secondary development of the ABAQUS extended finite element. Compared with the slurry fracturing test of blind-hole clay samples, the rationality of the simulation method for slurry fracturing in cohesive soil is verified. Through the establishment of the slurry fracturing extension model, the slurry fracturing process of shield tunneling in cohesive soil layer is simulated. The variation law of slurry pressure in the process of fracture extension is studied, and the influence of shield slurry support pressure, overburden thickness, formation shear strength, and slurry viscosity on fracture extension pressure and extension path is analyzed. Based on this numerical simulation method, the risk of slurry blow-out is analyzed in the shield tunneling intersecting the Queshan Reservoir of the Jinan Jiluo Road Crossing the Yellow River Tunnel North Extension Project.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Slurry Fracturing during Shield Tunneling under a Reservoir

et al. 2022

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“…Since the successful application in the USA in 1947, hydraulic fracturing has already become the most effective means of increasing production and transformation in low-permeability oil and gas reservoirs (Haddad and Sepehrnoori 2016;Kumar et al 2017), which occupies an increasingly important position in oil and gas reservoir transformation (Wang et al 2017a, b;Luo et al 2019). According to statistics, currently 60% of global oil and gas wells need hydraulic fracturing (Luo et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Simulation of multiphase flow pattern, effective distance and filling ratio in hydraulic fracture

Pei

Zhang

Zhou

et al. 2019

J Petrol Explor Prod Technol

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Hydraulic fracturing is a key measure to increase production and transform oil and gas reservoirs, which plays an important role in oil and gas field development. Common hydraulic fracturing is of inevitable bottlenecks such as difficulty in sand adding, sand plugging, equipment wearing and fracturing fluid damage. To solve these problems, a new type of fracturing technology, i.e., the self-propping fracturing technology is currently under development. Technically, the principle is to inject a self-propping fracturing liquid system constituting a self-propping fracturing liquid and a channel fracturing liquid into the formation. Self-propping fracturing liquid changes from liquid to solid through phase transition under the formation temperature, replacing proppants such as ceramic particles and quartz sand to achieve the purpose of propping hydraulic fractures. The flow pattern, effective distance and filling ratio of the self-propping fracturing liquid system in the hydraulic fracture are greatly affected by the parameters such as the fluid leak-off rate, surface tension and injection velocity. In this paper, a set of mathematical models for the flow distribution of self-propping fracturing liquid system considering fluid leakoff was established to simulate the flow pattern, effective distance, as well as filling ratio under different leak-off rates, surface tensions and injection velocities. The mathematical model was verified by physical experiments, proving that the mathematical model established herein could simulate the flow of self-propping fracturing liquid systems in hydraulic fractures. In the meantime, these results have positive impacts on the research of interface distribution of liquid-liquid two-phase flow.

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Numerical and experimental investigation of hydraulic fracture using the synthesized PMMA

et al. 2020

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Modeling of hydraulic fracturing in ultra-low permeability formations: The role of pore fluid cavitation

Cited by 14 publications

References 29 publications

Numerical Investigation of Slurry Fracturing during Shield Tunneling under a Reservoir

Numerical Investigation of Slurry Fracturing during Shield Tunneling under a Reservoir

Simulation of multiphase flow pattern, effective distance and filling ratio in hydraulic fracture

Numerical and experimental investigation of hydraulic fracture using the synthesized PMMA

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