ETHNOPEDAGOGICAL PRINCIPLES AT THE BASIC STAGES OF FORMATION: A BRIEF HISTORICAL OVERVIEW

Рассматриваются процессы развития народной педагогики и формирования этнопедагогики. Изучены ключевые моменты истории становления этнопедагогических принципов обучения и воспитания, способствовавшие формированию этнопедагогики как самостоятельной науки. В настоящий момент в педагогике представлено достаточное количество сведений, свидетельствующих о поэтапном течении этих процессов. В силу анализа узкого аспекта развития народной педагогики и этнопедагогики, чаще применительно к контексту их формирования на территории России, теряется их общий план становления, что подчеркивает актуальность настоящего исследования. Описан процесс формирования этнопедагогики со времен развития дородового общества первобытнообщинного строя (400–35 тыс. лет до н. э.), когда началось становление корневых педагогических принципов. Определены умения, навыки, обучение которым было полезно не только для выживания, но и создания объектов культурного наследия до Нового (конец XVIII – 1917 г.) и Новейшего времен (1917 г. – настоящее время), в которые многие этнопедагогические принципы трансформировались, поскольку произошло понимание необходимости изучения подрастающими поколениями не только родной культуры, но и культур других народов, проживающих на одной территории, с тем что-бы их совместное сосуществование строилось на чувствах уважения и заботе друг о друге. Выделены принципы этнопедагогики (трудовой принцип, принцип семейственности, преемственности воспитания и обучения, традиционности, природосообразности, игровой принцип, принцип нравственности, культуросообразности и др.) и на основе анализа истории их становления сделан вывод о том, что они являются основой успешного функционирования и развития современной отечественной системы просвещения, особенной чертой которой служит ориентация образования на этнокультурное обучение и воспитание. The article presents an analysis of the consistent development of the foundations of folk pedagogy and ethnopedagogy in history. The purpose of the research is to analyze the ethnopedagogical principles of teaching and upbringing developing at key moments in history that led to the formation of ethnopedagogy as an independent science. At the present moment a sufficient amount of information is presented in pedagogy that testifies about the stage-by-stage course of these processes. However, due to the analysis of the narrow side of the development of folk pedagogy and ethnopedagogy, most often in relation to the context of their formation on the territory of Russia, their general plan of formation turns out to be lost. This emphasizes the relevance of the study. The process of the formation of ethnopedagogy is described from the moment of development of prenatal society during the primitive communal system (400–35 thousand BC), which laid the first ethnopedagogical foundations: not only survival skills, but also the skills of creating objects of cultural heritage, up to the New (late XVIII – 1917) and New time (1917 – present), when many ethnopedagogical principles were transformed due to the understanding of the need for the younger generation to study not only their native culture, but also the cultures of other peoples living in the same territory, so that they coexistence was based on respect and concern for each other. The principles of ethnopedagogy are highlighted (labor principle, the principle of family, continuity of upbringing and education, traditionality, conformity to nature, the game principle, the principle of morality, cultural conformity, etc.) and, the conclusion based on the historical analysis of their formation is made: these principles are the basis of modern domestic education system’s successful functioning and development having as a special feature its orientation towards ethnocultural education and upbringing.

Delivered Successfully an Open Hole Side-Track from Very Challenging Formation Through Very Narrow MD Window: A Case Study from Kuwait

This article presents a unique case study where operating company, Kuwait Oil Company (KOC), decided to make an attempt to perform open hole side-track through a very narrow side-track window along with other exiting conditions such as severe downhole losses and drill through very challenging formation. To deliver such project in first attempt requires very detailed planning, close coordination with various service partners such as directional drilling and cementing. Placing a good side-track cement plug in such formation was a challenge, and 2nd challenge to get kicked off from this narrow window in first attempt which was the key. In case of failure, whip stock option has to be planned as a contingency, which possess new challenging of opening a depleted zone leading to commingling low/high pressure formation which could cause a complicated problem such as borehole stability, leads to stuck pipe problem. Failure to side-track from open hole could end of planning to drill extra hole which required extra casing string to run which will put this project well over AFE and heavily impact on well objective. This open hole Side-track was planned because while drilling original hole (12 ¼" hole section) close to planned well TD, experienced complete losses. In attempt to cure the losses, LCM was pumped with no success. Performed thixotropic cement plug job for losses control. While performing thixotropic cement plug job, the cement flash set before finishing the displacement, leading to stuck string. After backing off string and fishing attempts, unable to recover the fish completely. Fish left in hole leading to only 68 ft of open hole window available to side-track where performing a cement job was impossible due to severe losses. Only way to secure the well is to try for open hole side-track. With existing sever loss situation for initiating open hole side-track was a serious challenge due to lack of side force and flow restriction to initiate the side-track. Extensive pre-job planning, peer review and risk assessment was done in coordination with various service partners to deliver such challenging side-track. A hazard analysis decision tree was established to pinpoint the risks and appropriate mitigation measures along with contingency plan put in place. A detailed side-track guidelines was shared and review with the field crew. The wellbore was successfully side-tracked through a challenging reactive shale formation in a first attempt using a customized kick-off BHA, which not only helped to avoid loss zone in side-tracked hole but also provide additional cost savings to the company. The good hole condition at the side-track point was important to enable smooth passing of the following directional BHA to achieve directional goals.

First Implementation of an Innovative Mud-Removal Solution to Improve Well Integrity in Egypt

Downhole well integrity starts by removing the drilling fluids from the well and cleaning the annulus using a spacer to prepare for the cement to be placed. The Kamose field in the Egyptian Mediterranean Sea is drilled with a diesel oil-based drilling fluid system that is very difficult to remove with conventional spacer technologies. To improve the mud removal, an innovative spacer based on fiber scrubbing technology was used successfully. The Kamose wells are drilled with high deviation that varies from 60˚to75˚ resulting in poor mud removal due to insufficient casing standoff. The narrow windows between pore pressure and fracture gradients limits the pump rate and thus results in the unsuccessful use of conventional spacers. This results in a mud layer that is always left in the narrow side of the well, which impacts the log response and the downhole well integrity. To address the issue, an innovative mud removal solution was developed. The spacer design includes an engineered scrubbing material which, through mechanical action, cleans the surfaces of the casing and the formation. This allows for better contact of the cement with the casing, formation surfaces, and bonding. Extensive laboratory qualification tests with the current drilling fluids were performed not only to check the cleaning efficiency of the new spacer but also on the compatibility with all the other fluids. The results show a very high cleaning efficiency of 90% compared to 68% when using a conventional spacer. The solution was combined with the local cementing best practices which produced an excellent log response using sonic and ultrasonic tools therefore ensuing the downhole well integrity. The case history of the spacer fiber-based technology solution provides an alternative to improve the cement bond evaluation and ensuring downhole well integrity.

Successful Off Bottom Cementation of a Highly Deviated 4 ½ in Production Liner in UAE

Cementing a highly deviated production liner is associated with cement placement challenge that can compromise zonal isolation. A major operator in UAE, was facing a challenge to cement 4 ½ in slim production liner set at + 5000 ft off-bottom. The corresponding 6 in. section was drilled with a relatively high mud weight in the range of 12 to 13 PPG. One of the main challenge was the risk of solids settling on the low side of the wellbore, making mud displacement difficult to achieve while cementing. Additionally, cementing off-bottom without an ECP in a highly deviated wellbore with multiple exposed production zones, further increased cement placement complexity. A holistic engineering approach was integrated to ensure successful zonal isolation. Wellbore parameters and fluid properties were critically evaluated. To overcome off-bottom cementing and prevent slurry fallback risks, a weighted high viscosity pill with high yield point was placed as a temporary basement to support the cement column and isolate the reservoir during 4 ½ in liner job. After placement of the pill, the wellbore was observed for flow checks to ensure stable downhole conditions prior to displacing the drilling fluid across the liner interval to brine within the same density. A centralization program was implemented to achieve more than 70% stand-off which required a minimum centralization pattern of two rigid centralizers per joint which helped minimize the presence of mud channels on the narrow side. Effective mud removal was ensured through implementation of a spacer train in front of the cement. The first spacer was pumped with same mud density to reduce ECD followed by another advanced low invasion loss circulation spacer to mitigate losses as well as provide a sustained downhole rheology. A resilient, expandable and gas tight cement slurry, was selected to target long-term zonal isolation. Multiple hydraulic simulations were performed to optimize ECDs and ensure safe margins during placement A CFD (computational fluid dynamics) model was utilized to simulate hydraulics, expected mud removal and fluids inter-mixing especially during liner rotation. In addition, the model simulated high-calculated torques based on flow restrictions through liner hanger assembly. Lack of mechanical liner movement was compensated by additional pre-job circulation to fully condition the wellbore. The job was executed with no losses during cementing, and spacer and cement returns were received on the surface during reverse out. Utilizing the best engineering approach, practices, and techniques from this job is implemented in the future wells as the production of the well is directly affected by the cement quality. Post job cement integrity evaluation via a cement bond log confirmed excellent bonding of cement to the liner and reservoirs across the entire open-hole interval.

Tracking the thickness of the A68 Iceberg using CryoSat-2 and ICESat-2

<p>The A68 iceberg calved from the Larsen C ice shelf on the Antarctic Peninsula in July 2017 and has since been drifting northwards towards South Georgia. Originally covering an area of 5664 sq km, A68A's extent has been reduced to 2606 sq km (as of 23 December 2020) following the detachment of multiple smaller bergs. Using Satellite Altimetry data from CryoSat-2 and ICESat-2, we measure the thickness of the A68 iceberg. We use CryoSat-2 data acquired in the year before A68's calving from the Larsen C Ice Shelf in 2017 to create an initial thickness map. Following its calving, both CryoSat-2 and ICESat-2 tracks are geocoded onto the iceberg using imagery from MODIS and Sentinel-1. Comparing these measurements to the initial thickness allows us to track changes in A68's thickness. The thickness map reveals the presence of multiple 30m deep channels oriented along its narrow side, forming lines of weakness along which the iceberg shattered into multiple large fragments in December 2020. At the time of calving, its average thickness was 232m with a maximum thickness of 285m. Repeated measurements from satellite altimetry show the iceberg has thinned by an average of 32m, a thinning rate of 2.5cm per day. Combined with changes in area, we estimate that the iceberg has lost 64% of its original volume, or 941 cubic kilometres, representing a significant input of freshwater to the surrounding ocean. </p>

3D Dissection of Structural Membrane-Wall Contacts in Filamentous Moss Protonemata

In conventional light microscopy, the adjacent cell walls of filamentous moss protonemata are seen from its narrow side thereby obscuring the major area of cell–cell connection. Optical sectioning, segmentation and 3D reconstructions allow the tilting and rotation of intracellular structures thereby greatly improving our understanding of interaction between organelles, membranes and the cell wall. Often, the findings also allow for conclusions on the respective functions. The moss Physcomitrium (Physcomitrella) patens is a model organism for growth, development and morphogenesis. Its filamentous protonemata are ideal objects for microscopy. Here, we investigated the cell wall between two neighboring cells and the connection of membranes towards this wall after plasmolysis in 0.8 M mannitol. An m-green fluorescent protein (GFP)-HDEL cell line was used to visualize the endoplasmatic reticulum (ER), the plasma membrane (PM) was stained with FM4-64. Our studies clearly show the importance of cell–cell contacts in P. patens protonemata. In 86% of the investigated cell pairs, at least one of the protoplasts remained fully attached to the adjacent cell wall. By tilting of z-stacks, volume renderings and 3D reconstructions, we visualized the amount of attached/detached PM and ER components after plasmolysis and membrane piercings through the wall of cell neighbors.

Effect of Buoyancy and Inertia on Viscoplastic Fluid–Fluid Displacements in a Regular and an Irregular Eccentric Annulus

Casing strings and liners are important subsurface structural components in petroleum and in geothermal wells. After the casing string has been run in hole, it is cemented to the formation by pumping a sequence of spacer fluids and cement slurry into the annulus outside the string. Spacer fluids are usually pumped ahead of the cement slurry to displace the drilling fluid from the annulus that is to be cemented and thereby avoid contamination of the cement slurry. Fluid displacements are governed by inertia, buoyancy, and viscosity effects, in addition to being strongly influenced by the annular geometry. Poor centralization of the casing or irregularities such as washouts can influence the displacement flows both locally and over long axial distances. We present three-dimensional numerical simulations of the displacement flow involving two viscoplastic fluids in the vicinity of a symmetric local hole enlargement. We focus on laminar flow regimes in the regular part of the annulus and investigate how the volumetric flowrate and the mass density difference between the fluids affect the displacement efficiency in the regular and the irregular parts of the annulus. This study considers viscoplastic displacement flows in a near-vertical, irregular annulus and is an extension of a previous publication that focused on a near-horizontal annulus. We contextualize our simulations by comparison to industry guidelines for effective and steady laminar displacements in the regular, near-vertical annulus. Here, eccentricity favors flow in the wider sector of the annulus, while a positive density difference between the fluids generates secondary, azimuthal flow toward the narrow side of the annulus. In the enlarged and irregular section, both the axial bulk velocity and casing eccentricity decrease sharply and buoyancy becomes more pronounced compared to in the regular annulus. We quantify and discuss the effects of local hole enlargements on displacement efficiencies. Simulations of cementing flows can aid in optimizing fluid properties and pump rates, including when the wellbore has suspected or confirmed zones of irregular geometries.