Sand Production Management for Unconsolidated …

complete sand control and limited sand production. This book presents a comprehensive introduction of technologies applied in the development of poorly consolidated sandstone reservoirs. The contents include studies of sand production mechanisms, sand production prediction and productivity index appraisal, selection of well completion approaches,

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Numerical investigation of sand production mechanisms in weak …

Sand production is a coupled fluid–solid interaction process that primarily involves two mechanisms: mechanical instabilities that lead to localized plastic behavior and failure of …

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Sand Control: Sand Characterization, Failure Mechanisms, and …

Mechanisms for sand failure include: tensile, shear, cohesive, and pore collapse. Additionally, failure due to chemical effects can occur when the cementation materials are …

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Quantitative Analysis of Mechanisms for Water-Related Sand …

Based on the time frame of sand production record, four major possible chemical reactions between reservoir sand and formation water are identified and analyzed, including …

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Mechanisms of sand production, prediction–a review and the …

By understanding the mechanisms of sand production, engineers can design production parameters like flow rates and drawdowns to minimize formation stress and reduce …

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Photodynamic therapy

Photodynamic therapy - mechanisms, photosensitizers and combinations Biomed Pharmacother. 2018 Oct:106:1098-1107. doi: 10.1016/j.biopha.2018.07.049. ... Over the last decade, a significant acceleration in the development of nanotechnology has been observed. The combination of photosensitizers with nanomaterials can improve the photodynamic ...

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Cold stress tolerance mechanisms in plants. A review

The human population is increasing at an alarming rate, whereas at the same time agricultural productivity is decreasing due to the effect of various environmental problems. In particular, cold stress is a serious threat to the sustainability of crop yields. Indeed, cold stress can lead to major crop losses. Various phenotypic symptoms in response to cold stress include poor germination ...

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Bacterial resistance to antibacterial agents: Mechanisms, control

The use of antibiotics over 100 years has triggered the widespread and rapid transfer of antibiotic resistance genes (ARGs) among bacteria across the world (Andersson, 2003; Larsson and Flach, 2021).Clinical resistance of the spirochaete bacterium Treponema pallidum to the antibiotic arsphenamine (also known as Salvarsan) was first reported in 1924 (Silberstein, …

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A state-dependent multi-mechanism model for sands

A state-dependent multi-mechanism model for sands in three-dimensional space is proposed within the framework of critical-state soil mechanics. The mechanical deformation behaviour of sands is characterised with a macroscopic volumetric mechanism and a number of one-dimensional equivalent microscopic shear mechanisms (EMSMs) in various orientations. …

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Micromechanical investigation of the aging mechanism in sand

This paper studies the mechanism of sand aging using DEM simulations of a granular assembly subjected to triaxial shear, creep, and post-creep shear. The DEM model with irregularly shaped incompressible particles is constructed and calibrated to mimic a natural sand.

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Mechanisms of human embryo development: from cell fate to

Gene regulatory networks and tissue morphogenetic events drive the emergence of shape and function: the pillars of embryo development. Although model systems offer a window into the molecular biology of cell fate and tissue shape, mechanistic studies of our own development have so far been technical …

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Sintering mechanism of silica-rich filler sands for sliding …

2 Nippon Yakin Kogyo Co., Ltd., Kawasaki Plant, Technology Development Dept, 4-2 Kojima-cho, ... [1-2]. Accordingly, a study has been conducted to understand the sintering mechanism of sands.

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Mechanism and modeling of infiltration of saturated sand by …

The slurry pressure-balance shield tunneling method is commonly used to excavate water-bearing strata, particularly saturated sand layers, owing to its high safety and effective pressure control (Bezuijen et al., 2006, Liang et al., 2020, Liu et al., 2020).Slurry primarily consisting of bentonite (a nonmetallic, montmorillonite-rich mineral) is selected because of its …

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Study on liquefaction mechanism of saturated sand considering …

The soil in actual site is anisotropic consolidated with an initial consolidation ratio k c =σ 10 /σ 30 and a deviator stress (σ 10 −σ 30), where σ 10 and σ 30 denote the initial vertical effective stress and the initial confining pressure, respectively. The effect of consolidation ratio on the liquefaction resistance of sand has been studied using laboratory tests over the decades.

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Experimental study on the development mode and evolution mechanism …

Experimental study on the development mode and evolution mechanism of sodium silicate solidified sand under different temperatures and curing paths ... sodium hydroxide and water. River sand near Chengdu City, Sichuan Province, was used for this study. ... The theoretical maximum strength growth rate can be derived from the first-order ...

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Development by self-digestion: molecular mechanisms and …

Development by self-digestion: molecular mechanisms and biological functions of autophagy Dev Cell. 2004 Apr;6(4):463-77. doi: 10.1016/s1534-5807(04)00099-1. ... cellular and tissue remodeling, and cell death. However, until recently, the functions of autophagy in normal development were largely unknown. The identification of a set of ...

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Mechanisms of NAFLD development and therapeutic strategies

Mechanisms of NAFLD development and therapeutic strategies Nat Med. 2018 Jul;24(7):908-922. doi: 10.1038/s41591-018-0104-9. Epub 2018 Jul 2. Authors Scott L Friedman 1, Brent A Neuschwander-Tetri 2, Mary Rinella 3, Arun J al 4 Affiliations 1 …

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Mechanism of Compaction Grouting in Sand and Efficiency …

In this paper, using the Nor-sand model, an finite difference method (FDM) simulation was carried out to study the grout efficiency and grout pressure of compaction …

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Molecular and cellular mechanisms of tooth development

The tooth provides an excellent system for deciphering the molecular mechanisms of organogenesis, and has thus been of longstanding interest to developmental and stem cell biologists studying embryonic morphogenesis and adult tissue renewal. ... Molecular and cellular mechanisms of tooth development, homeostasis and repair Development. 2020 Jan ...

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Hydro-mechanical Kinematic Framework for Sand Production

In this work, we present a novel semi-analytical framework for modelling sand production in cylindrical geometries under axisymmetric conditions and isotropic stress field.

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Particle gradation effects on creep characteristics and the …

With the rapid development of marine engineering, calcareous sand as a primary material for island construction in the world, has become the foundation for large-scale projects and infrastructure [1], [2], [3]prehending the creep behavior of calcareous sand is crucial for guaranteeing the long-term stability of engineering facilities in land reclamation and island …

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(PDF) Soil Liquefaction: Mechanism and Assessment …

The basic mechanisms of earthquake-induced soil liquefaction are introduced by considering the shaking of a block on a thin granular layer, which mechanical behaviour is modelled with a ...

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Frontiers | Mechanisms of ROS Regulation of Plant Development …

Roles of ROS in Plant Growth and Development. The appearance of aerobic conditions gave organisms the opportunity to use oxygen as an electron acceptor, while enabling them to harness its reactive properties for metabolism and signaling (Schippers et al., 2012; Foyer and Noctor, 2016).It was therefore, inevitable that evolution in an oxygenic environment would …

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Conceptual evolution and practice of sand management

This paper studies sand management (SMan) and its conceptual development from a geomechanical approach. This effort highlights how risk paradigms within the oil and gas industry closely influence the practice and conceptualization of SMan (Ben Mahmud, Leong and Lestariono, 2020; Mahmoudi et al., 2018).In this paper, "concept" implies a principle of action …

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Constructed wetland substrates: A review on development, …

Substrates are used to construct the body of CWs, which play a central role in treatment process (Mlih et al., 2020).The effects of substrates (physical filtration and interception, adsorption and ion exchanges), plants and microorganisms on pollution treatment are simultaneously present in CWs (Drayer and Richter, 2016; Fu et al., 2018).The categories and …

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Recrystallization mechanisms and microstructure development in …

Recrystallization nucleation mechanisms were subject of contention for several years. It is now appreciated that the recrystallization nucleation mechanism differs from that characteristic of conventional phase transformations where classical nucleation theories are applicable [13].The nuclei which give rise to new recrystallized grains are believed to be …

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Mechanisms of NAFLD development and therapeutic strategies

a, A schema for diagnosing NAFLD and NASH.Credit: Marina Corral Spence/Springer Nature. b, The panel of images from liver biopsies demonstrate the typical appearances of macrovesicular steatosis (fat), hepatocellular ballooning, lobular inflammation and pericellular fibrosis (arrows).As the disease progresses into cirrhosis (not shown), these features may also regress.

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A Review of Sand Aging: Mechanisms and Impacts

Sand aging, defined by time-dependent increases in stiffness and strength over periods ranging from days to months, poses significant challenges in geotechnical engineering …

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(PDF) Mechanisms of sand production, prediction–a review and …

Empirical correlations, numerical simulations, and analytical models are among the sand production prediction techniques critically assessed in this study. The benefits, …

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Micromechanical investigation of the aging mechanism in sand

Initially, the aging of sand was speculated to be caused by the precipitation of carbonate or silica gel that leads to cementation at particle contacts (Mitchell and Solymar, 1984).Baxter and Mitchell (2004) examined this mechanism for two sands aged under 100 kPa vertical pressure in rigid wall cells at different relative densities and temperatures.

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