Characterization of Sand Production for Clayey-Silt …
ResultCharacterization of Sand Production for Clayey-Silt Sediments Conditioned to Hydraulic Slotting and Gravel Packing: Experimental Observations, Theoretical …
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Effect of clay type and content on the mechanical properties of clayey
ResultClayey silt hydrate sediment samples exhibit strain hardening behavior accompanied by shear shrinkage. ... sand production and wellbore plugging, and submarine landslide during hydrate mining (Zhao et al., 2022). For wellbore instability and collapse, it is related to the strength and deformation of hydrate reservoir. To …
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Mechanical properties and strength criterion of clayey sand …
ResultIn this study, artificial samples were prepared by proportionally mixing sand and clay minerals (montmorillonite, illite, kaolinite, and chlorite) based on the mineral composition and granulometric composition of drilling cores taken from SH7B, a gas hydrate bearing reservoir in Shenhu area of South China Sea [4, …
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Characterization of Sand Production for Clayey-Silt …
ResultAs one of the geotechnical risks, sanding has been one of the main constraints for safely and sustainably developing marine natural gas hydrate. In this study, a cylindrical vessel that is packed with the clayey-silt sediment collected from the Shenhu area of the northern South China Sea is used to microscopically …
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Protocol for sand control screen design of production wells …
ResultSand control during gas recovery from clayey silt hydrate reservoirs has been a challenge for the industry and academia for a long time. This study …
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A sand-production control system for gas production from clayey …
ResultTo deal with sand-production problems for clayey silt hydrate reservoirs, a systematic solution should be applied to maintain formation stability and prolong the gas production cycle. NSAM is introduced in this paper for SCS analysis. (ii) Formation sanding behaviors, down-hole sand-control optimization, …
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An experimental study on the influence of metakaolin on …
ResultThe aim of this research is to investigate the effect of the additive metakaolin on the strength parameters of clayey sand soil. For this purpose, in addition to identification tests, a set of experiments including Atterberg limits and modified Proctor, uniaxial compressive strength, direct shear, permeability, and pH …
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Characteristics of Nitisol profiles as affected by land use type …
Nitisols are among the most extensive agricultural soils in the Ethiopian highlands but soil degradation threatens their productive capacity. In this study, the effects of two land use systems, intensive cereal and agroforestry systems, and slope class on physical and chemical … See more
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Ethiopia's Silica Sand Market Report 2024
ResultSilica Sand Imports Imports into Ethiopia. Silica sand imports into Ethiopia reached X tons in 2022, stabilizing at 2021 figures. Overall, imports showed a relatively flat trend pattern. The pace of growth was the most pronounced in 2015 with an increase of 111%. As a result, imports attained the peak of X tons.
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Shear strength features of unsaturated clayey sand by lab …
ResultTo study the shear feature of the clayey sand subgrade, the equations of soil–water characteristic curve with different net mean stresses were established based on laboratory test and non-linear elastic theory. The laboratory result shows that the net mean stress has significantly affected on the soil–water characteristic …
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Characterization of Sand Production for Clayey-Silt …
ResultExperimentally, by generating slots near the gravel packing, sand failure dynamics, sand flow paths, and sand production for the clayey-silt …
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Construction Sands Price in Ethiopia
ResultConstruction Sands Price in Ethiopia (FOB) - 2022. The average construction sands export price stood at $97 per ton in 2022, rising by 19% against the previous year. Overall, the export price, however, faced a abrupt setback. The most prominent rate of growth was recorded in 2016 when the average export price increased by 78%.
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Soil Properties | SpringerLink
ResultSoil depth. Due to the existence of diversified topography, the soils of Ethiopia have different depths (Fig. 7.1).The presence of rugged toposequence in a very short distance makes the soils to be shallow in the upper positions and deeper in the lower areas (Sheleme 2017).The variation in soil depth is a result slope of …
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Experimental study on sand production and coupling
ResultThe results show that with the increase of clay content, the total mass of sand production first increases and then decreases, and it reaches maximum when the clayey content is 20%. The sand production is the lowest before hydrate dissociation and increases significantly during hydrate dissociation, which mainly …
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Characterization of Sand Production for Clayey-Silt …
ResultCharacterization of Sand Production for Clayey-Silt Sediments Conditioned to Hydraulic Slotting and Gravel Packing: Experimental …
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Soil acidity challenges and the significance of and …
ResultThe multiplication factor of Al 3+ can vary from 1 for sandy soils to 4 for clayey. Accordingly, since most of the Ethiopian acid soils of the arable lands …
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Fertility Status of Acid Soils under Different Land Use Types …
ResultHaile et al. [ 5] estimated that ∼43% of the Ethiopian crop land is affected by soil acidity). The soil acidity in Ethiopia is dominated by strong acid soils (pH 4.1–5.5) [ 6 ]. The decline in soil fertility is caused by land use type changes [ 7 ]. The loss of soil fertility in Ethiopia is related mainly to cultural practices such as low ...
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(PDF) Engineering Geological Soil and Rock Characterization …
ResultFour soil types were identified in the field: clay, silt, sandy clay/silt and clayey/silty sand soils. Laboratory result revealed that moisture content of the soils ranges from 15.8 to 40.9% for ...
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Characterization of Sand Production for Clayey-Silt …
ResultAbstract In our previous work (Jin et al. 2021), an experimental effort has been made to microscopically observe the sand failure, migration within a matrix, invasion to gravel packing, and production for openhole gravel packing, while three sanding patterns (i.e., fractures, wormholes, and fluidized channels) have been identified. …
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Characterization of Sand Production for Clayey-Silt …
ResultSummary. As one of the geotechnical risks, sanding has been one of the main constraints for safely and sustainably developing marine natural gas hydrate. In this study, a cylindrical vessel that is packed with the clayey-silt sediment collected from the Shenhu area of the northern South China Sea is used to …
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(PDF) Engineering geological characterization of soils and …
ResultThese problems are most evident in Arba Minch town, Southern Ethiopia, due to potentially expansive soils and rocks. ... 1.7-58.3, 16.9-69.1, and 19.1-69.5%, respectively, and can be classified as ...
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Ethiopia: Construction Sands Market 2024
ResultProdcom 08121190 - Construction sands such as clayey sands, kaolinic sands, f eldspathic sands (excluding silica sands, metal bearing sands) Country coverage: Ethiopia; Data coverage: Market volume and value; Per Capita consumption; Forecast of the market dynamics in the medium term; Trade …
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Characterization of Sand Production for Clayey-Silt …
ResultIn our previous work (Jin et al. 2021), an experimental effort has been made to microscopically observe sand failure, migration within a matrix, invasion toward gravel-packing zones, and production conditioned to the openhole gravel packing, while three sanding patterns (i.e., fractures, wormholes, and fluidized …
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Protocol for sand control screen design of production wells for clayey
ResultMultistage sand control optimization recommended for clayey silt hydrate production well. Schematics of the holding coarse expelling fine particles (HCEFP) method Flowchart of the HCEFP method for ...
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Experimental study on sand production and coupling
ResultAbstract. To further understand the characteristics of clay and sand production (hereafter collectively referred to as sand production) and to provide …
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Strength Characteristics of Clayey Sand Stabilized Using
ResultMona Bayoumy, Mostafa El Sawwaf, Ahmed Nasr & Ahmed Elsawwaf. 205 Accesses. Explore all metrics. Abstract. The present study …
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(PDF) Insight on Effect of Scoria Gradation on Load
ResultThe uniformly graded sand-sized scoria was found to be the gradation type with the highest performance in modifying the California bearing ratio and maximum dry density of the clayey subgrade.
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Frontiers | Evaluation of engineering properties of clayey sand …
ResultThe reaction between soil and bio-enzymes primarily involves an interaction between the clay content of the soil sample and the bio-enzyme. Clayey soils have a net negative charge and attract positively charged ions, known as replaceable cations. These cations can be replaced or exchanged by cations of …
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Low black carbon concentration in agricultural soils of …
ResultThe clayey soils of Sire, central Ethiopia, contained more total C (mean 2.4%, median 2.2%) than the drier and more coarse-textured soils of Kobo in northern Ethiopia (mean 1.0%, median 1.1%). The terraced fields and their traditionally cultivated control plots in particular were lower in C (mean 0.74%) …
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A laboratory investigation of the geomechanical properties …
ResultThis study aimed to determine the effect of graphite additive on the strength parameters of clayey sand. Compaction, unconfined compression strength, shear strength, and permeability tests on clayey sand samples were conducted under non-stabilized and stabilized conditions containing varying amounts of …
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