A Novel Approach to Investigating Transport of Lost Circulation Materials in Rough Fracture

Feng, Yi; Li, Gao; Meng, Yingfeng; Guo, Boyun

doi:10.3390/en11102572

Cited by 31 publications

(9 citation statements)

References 42 publications

(51 reference statements)

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“…1000 particles were fallen freely from a high plane to a square container with dimensions of 10dp × 10dp × 20dp, where the container's height is 20dp. When the maximal speed of As for random packing, it was generated with discrete element method (DEM) as reported in literatures [15][16][17]. 1000 particles were fallen freely from a high plane to a square container with Energies 2019, 12, 1666 4 of 14 dimensions of 10d p × 10d p × 20d p , where the container's height is 20d p .…”

Section: Physical Modelmentioning

confidence: 99%

Investigation of Effective Thermal Conductivity for Ordered and Randomly Packed Bed with Thermal Resistance Network Method

Yang

Wang

2019

Energies

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In the present paper, the effective thermal conductivities of Li4SiO4-packed beds with both ordered and random packing structures were investigated using thermal resistance network methods based on both an Ohm’s law model and a Kirchhoff’s law model. The calculation results were also validated and compared with the numerical and experimental results. Firstly, it is proved that the thermal resistance network method based on the Kirchhoff’s law model proposed in the present study is reliable and accurate for prediction of effective thermal conductivities in a Li4SiO4-packed bed, while the results calculated with the Ohm’s law model underestimate both ordered and random packings. Therefore, when establishing a thermal resistance network, the thermal resistances should be connected along the main heat transfer direction and other heat transfer directions as well in the packing unit. Otherwise, both the total heat flux and effective thermal conductivity in the packing unit will be underestimated. Secondly, it is found that the effect of the packing factor is remarkable. The effective thermal conductivity of a packed bed would increase as the packing factor increases. Compared with random packing at similar packing factor, the effective thermal conductivity of packed bed would be further improved with an ordered packing method.

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Section: Physical Modelmentioning

confidence: 99%

Investigation of Effective Thermal Conductivity for Ordered and Randomly Packed Bed with Thermal Resistance Network Method

Yang

Wang

2019

Energies

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“…Environmental consideration and cost concerns have further stimulate new interest in the use of WBDFs in deep wells instead of oil‐based ones. Furthermore, they serve many functions, cooling and lubricating drilling bits, carrying rock cuttings to the surface, maintaining wellbore pressure, and preventing a fluid from seeping into a formation . Thus, the performance stability of a drilling fluid decides the success or failure of a drilling task, drilling speed, and costs of drilling operation.…”

Section: Introductionmentioning

confidence: 99%

Synthetic copolymer (AM/AMPS/DMDAAC/SSS) as rheology modifier and fluid loss additive at HTHP for water‐based drilling fluids

Huang

Zhang

Zheng

2019

J of Applied Polymer Sci

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In the petroleum industry, high temperature and high pressure (HTHP) would dramatically worsen rheological properties and increase fluid loss volumes of drilling fluids. Synthetic polymer as an indispensable additive has attracted more and more attention recently. In this article, a new copolymer (named AADS) of 2‐acrylamide‐2‐methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, and sodium styrene sulfonate was synthesized through aqueous solution polymerization. The chemical structure of the copolymer was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Moreover, its thermal stability was simultaneously analyzed using a differential scanning calorimetry. The results showed that the synthetic polymer contained all the designed functional groups, and its structure was consistent to the desired one. Under contamination of sodium chloride, AADS solution maintained relatively high viscosity in high concentration brine, showing a good antisalt capacity. Furthermore, the effect of AADS content and temperature on rheological behavior and fluid loss volume of the water‐based drilling fluid (WBDF) containing the synthesized product were investigated according to the American Petroleum Institute standard. Results showed that the rheological and filtration properties of the prepared WBDF were improved with the increase in the AADS concentration before and after the thermal aging test. In addition, in the temperature range of 80–240 °C, a reversible rheological behavior was observed during the heating–cooling process, and the HTHP fluid loss was controlled within 22.5 mL, suggesting that the copolymer AADS was suitable for making WBDF s with high temperature resistance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47813.

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“…In recent years, the phenomenon of particle migration in a real fracture has been studied by combining the optical scanning technology, CT scanning technology, and numerical simulation. The LCM plugging process in the actual fracture obtained by optical scanning was analyzed by CFD‐DEM . Koyama et al used optical scanning technology to obtain the fracture surface, and they used a particle tracking method to analyze the particle penetration in a sheared fracture.…”

Section: Introductionmentioning

confidence: 99%

“…The LCM plugging process in the actual fracture obtained by optical scanning was analyzed by CFD-DEM. 24 Koyama et al 12 used optical scanning technology to obtain the fracture surface, and they used a particle tracking method to analyze the particle penetration in a sheared fracture. However, the particle-particle and particle-wall interaction was not extensively considered.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of particulate suspension transport and permeability impairment in an actual rough fracture under normal stresses

Bin

Tang

Zhao

et al. 2019

Energy Science & Engineering

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The transportation and capture of particulate suspension in a rough fracture are widely encountered in hydrocarbon exploitation. According to a full review of the literature, traditional studies mainly focus on the placement and settlement of coarse particles such as proppants and lost circulation materials. Furthermore, a fracture is often considered to be equivalent to smooth parallel plates, whereas actual fractures are roughly walled with microconvex and are affected by normal stresses. The particulate suspension transport mechanism in a fracture under different normal stresses is still unclear. This paper proposes an approach to evaluate the permeability impairment caused by size‐exclusion of solid particles in a fracture under different normal stresses. The morphology of fracture flow space under different normal stresses is obtained by using optical scanning and FEM. Furthermore, the unresolved CFD‐DEM method is used to study the mechanism of the capture and migration of the particulate suspension in a fracture. The simulation results are in agreement with the experimental results. Furthermore, the effects of the particle size, particle concentration, injected particle volume, fracture occurrence, and applied pressure on particle invasion are discussed.

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A Novel Approach to Investigating Transport of Lost Circulation Materials in Rough Fracture

Cited by 31 publications

References 42 publications

Investigation of Effective Thermal Conductivity for Ordered and Randomly Packed Bed with Thermal Resistance Network Method

Investigation of Effective Thermal Conductivity for Ordered and Randomly Packed Bed with Thermal Resistance Network Method

Synthetic copolymer (AM/AMPS/DMDAAC/SSS) as rheology modifier and fluid loss additive at HTHP for water‐based drilling fluids

Numerical simulation of particulate suspension transport and permeability impairment in an actual rough fracture under normal stresses

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