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Author

Jiao Peng

Bio: Jiao Peng is an academic researcher from Xi'an Shiyou University. The author has contributed to research in topics: Hydraulic fracturing & Displacement (fluid). The author has an hindex of 3, co-authored 3 publications receiving 88 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a comprehensive numerical model is developed to study the fracture propagation direction during volume fracturing of unconventional reservoirs, based on elastic and fracturing mechanics of a rock, as well as the maximum circumferential stress criterion and boundary element method.

64 citations

Patent
07 Jan 2015
TL;DR: In this article, a parallel panel crack simulation device under the leak-off condition of a fracturing fluid comprises a crack formed by two parallel organic glass panels, a fracture inlet and a fracture outlet, wherein compact sponge is adopted at the upper ends and the lower ends of the two parallel panels to serve as an interlayer, rubber pads are adopted on the left side and the right side to form as interlayers to form simulation crack sections.
Abstract: A parallel panel crack simulation device under the leak-off condition of a fracturing fluid comprises a crack formed by two parallel organic glass panels, a fracturing fluid inlet and a fracturing fluid outlet, wherein compact sponge is adopted at the upper ends and the lower ends of the two parallel organic glass panels to serve as an interlayer, rubber pads are adopted on the left side and the right side to serve as interlayers to form simulation crack sections, the compact sponge is adopted at the upper end and the lower end to serve as the interlayer, only a liquid phase is allowed to pass, and a solid phase isn't allowed to pass; the fracturing fluid inlet and the fracturing fluid outlet are designed at the left end and the right end of the simulation crack section, are located at the centers of the parallel panels and are rectangular; and devices for collecting filtrate are arranged at the upper end and the lower end of a leak-off liquid collecting part of the fracturing fluid, and valves are mounted at upper and lower outlets and can be used for adjusting the leak-off speed and the leak-off amount. The device can simulate various true conditions such as sand carrying condition, sand paving condition, migration rules, leak-off and the like of the fracturing fluid entering the crack, and a basis is provided for preference of fracturing displacement, speed and sand ratio and the formula during fracturing design.

7 citations

Journal ArticleDOI
TL;DR: In this paper , the authors analyzed material migration and deposition in EAST with tungsten (W) upper divertor, molybdenum inner wall and graphite lower divertor.
Abstract: Plasma-wall interaction is one of the key issues in tokamaks, as the material erosion and deposition will strongly influence the lifetime of plasma facing materials, fuel retention and plasma performance. Material migration and deposition have been firstly analyzed after the 2017 experimental campaign in EAST with tungsten (W) upper divertor, molybdenum inner wall and graphite lower divertor. It is found that the deposited elements on plasma-facing materials (PFMs) mainly consisted of Li, C, O, W and Mo etc, which was from the deposition of wall conditioning material and the sputtering of PFMs. More than 90 wt% of the deposits were lithium carbonate and lithium hydroxide due to the routine lithium wall conditioning in EAST. Quantitative characterization of element density on graphite tile from lower inner divertor showed that W and Mo deposition increased when closer to the lower divertor, which is consistent with the decreasing normalized poloidal magnetic flux. The element composition of PFMs along poloidal direction has been measured by handheld X-ray fluorescence (XRF). The concentration of deposited Mo and W is less than 0.2 wt% on most of the PFM surface. Double peaks of W concentration near the upper W divertor and at the midplane tile were observed on the TZM inner wall surface at the high-field side, which can be explained by higher redeposition at the location near the upper inner divertor or with a smaller normalized poloidal magnetic flux. Besides, more redeposited Mo and W was found at the inner and outer divertor near strike points compared with the dome region.

5 citations

Journal ArticleDOI
TL;DR: In this article , a thermal-mechanical coupled two-dimensional model is developed to study the initiation and propagation of fractures induced by thermal shock, where the heat convective boundary is applied in the surface between the fluid and the rock.
Abstract: As the burial depth of shale exploitation increases, it is challenge to form fracture networks through hydraulic fracturing technology. When cryogenic fluid contacts with hot rock, heat exchange process occurs and temperature gradient is generated at the rock surface, resulting in thermal stress. Once the thermal stress exceeds the tensile strength, the fractures are generated. To study the initiation and propagation of fractures induced by thermal shock, a thermal-mechanical (TM) coupled two-dimensional model is developed in the paper. To simulate the heat exchange process, the heat convective boundary is applied in the surface between the fluid and the rock. In addition, the initiation and propagation of fractures are described by the cohesive zone model. The accuracy and reliability of the numerical model is validated by an existing analytical solution. Under the thermal shock, the temperature at the contact surface drops quickly. The stress distribution is determined by the temperature variation. The variations of temperature and stress are greatly affected by the heat exchange coefficient. With the fractures embedded in the model, the initiation and propagation of fractures are analysed. The multi-fracture propagation induced by thermal shock exhibits competition effect. With the propagation of fractures, the stress distribution in the rock changes. The heat exchange coefficient has a significant effect on fracture initiation and propagation, presenting more fractures generation in the larger coefficient.

Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effects of material heterogeneity and geostress difference on the crack growth and distribution in three dimensions in heterogeneous rocks. And they found that material heterogeneity greatly influenced the 3D initiation, growth, and distribution of hydrofracturing cracks.

86 citations

Journal ArticleDOI
TL;DR: In this paper, a numerical model was used to represent the actual heterogeneous structure of a physical specimen, and the initiation position and process of propagation of cracks influenced by geostress differences and heterogeneity was discussed.

82 citations

Journal ArticleDOI
TL;DR: In this article, a geomechanical model for the Bangestan reservoir in an oil well in the south-west of Iran was presented, which demonstrated a scientific approach to prepare a geomagnetical model.

64 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive numerical model is developed to study the fracture propagation direction during volume fracturing of unconventional reservoirs, based on elastic and fracturing mechanics of a rock, as well as the maximum circumferential stress criterion and boundary element method.

64 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the impact of the lithologic interface on casing deformation and found that the effect of the interface on the casing stress plays a decisive role under the combined effect of internal and external pressures when the cement sheath is completed.

59 citations