Applying geological and mathematical modeling to predict fluid influx in horizontal wells (the case of Kalamkas oil field)

One of the ways to increase well oil production is to reduce the filtration resistance of the bottom-hole zone. Along with well-known stimulation methods, such as modern methods of treating wells bottom-hole zone, side tracking (drilling of lateral horizontal boreholes) is of great interest. The following works have been implemented Kalamkas field: a complex of geological, geophysical and field exploration; correlation schemes to track the lithology of the formation; clarifying structural maps and engineering maps; justifying activities to select one or more wells for horizontal drilling; hydrodynamic calculations and estimating their flow rate.

Artificial Neural Network Model for the Evaluation of Added Resistance of Container Ships in Head Waves

The decrease in ship added resistance in waves fits into both the technical and operational measures proposed by the IMO to reduce the emissions of harmful gases from ships. Namely, the added resistance in waves causes an increase in fuel consumption and the emission of harmful gases in order for the ship to maintain the design speed, especially in more severe sea states. For this reason, it is very important to estimate the added resistance in waves with sufficient accuracy in the preliminary design phase. In this paper, the possibility of applying an ANN to evaluate added resistance in waves at the different sea states that the ship will encounter during navigation is investigated. A numerical model, based on the results of hydrodynamic calculations in head waves, and ANN is developed. The model can estimate the added resistance of container ships with sufficient accuracy, based on the ship characteristics, sailing speed, and the sea state using two wave energy spectra.

Optimization of the Propulsive Efficiency of a Fast Catamaran

The present study deals with the local optimization of the stern area and of the propulsive efficiency of a battery-driven, fast catamaran vessel. The adopted approach considers a parametric model for the catamaran’s innovative transom stern and a QCM (Quasi-Continuous Method) body-force model for the effect of the fitted propellers. Hydrodynamic calculations were performed by the CFD code FreSCO+, which also enabled a deep analysis of the incurring unique propulsive phenomena. Numerical results of achieved high propulsive efficiency were verified by model experiments at the Hamburgische Schiffbau Versuchsanstalt (HSVA), proving the feasibility of the concept.

Modelling the effect of Flood Retention Ponds in Arachthos River (Arta, Greece)

<p>Arachthos River is the largest river in Epirus and the 8<sup>th</sup> largest in Greece; it is 110 km long and its drainage area is 2209 km2. After emanating from Pindus mountains (near Metsovo), it enters into the Pournari Reservoir in Arta, passes through Arta and discharges into the Ambracian Gulf near Kommeno. Arachthos River prevents flooding of the city of Arta and supplies water to most of Epirus.</p><p>The design of flood protection works in Arachthos River is currently in progress; it is performed by a consortium of Greek Consulting Firms for the Ministry of Infrastructure and Transportation. In the present work, we examine the effect of Flood Retention Ponds on the inundation area and the subsequent flood risk for the city of Arta. The Flood Retention Ponds are constructed immediately downstream of the Pournari Reservoir and 5600 m upstream of the historic Bridge of Arta; their exact locations were identified after a preliminary study and field surveys. Firstly, we performed the design of the Flood Retention Ponds, based on international standards and specifications found in the international literature; then, we performed hydrodynamic calculations using the Hydrologic Engineering Center's-River Analysis System (HEC-RAS) 1D/2D with and without the Flood Retention Ponds. Thirdly, we compared the calculations and the corresponding inundation areas and derive conclusions on the effect of Flood Retention Ponds.</p><p> </p><p> </p>

TO THE CALCULATION OF THE HYDRODYNAMICS OF A DENSE LAYER WHEN DRYING NONSPHERICAL PET GRANULES

В работе представлена зависимость перепада давления от высоты слоя для нешарообразных гранул полиэтилентерефталата. Полученные зависимости сопоставлены с известной формулой Эргуна. Также в работе уделено внимание выбору рационального характерного размера несферических частиц для гидродинамических расчетов в зернистом плотном слое. The paper presents the dependence of the pressure drop on the layer height for non-spherical polyethylene terephthalate granules. The obtained dependences are compared with the well-known Ergun formula. The work also focuses on the choice of a rational characteristic size of non-spherical particles for hydrodynamic calculations in a granular dense layer.

Geological model and optimal well placement substantiation at the western part Tyumen suite layers of Khanty-Mansiysk Autonomous Okrug — Ugra

The middle Jurassic Tyumen sediments have been involved in the development of oil facilities in the territory of the Khanty-Mansiysk Autonomous Okrug — Ugra for the last decade. The Jk2-5 formation is represented by complex interlayering of poorly permeable sandy-aleurite lenses and clay barriers with low reservoir properties. Recoverable oil reserves of the Jk2-5 formation on the Krasnoleninsky arch amounts to several hundred million tons. According to the collector permeability, the reserves of the object are classified as hard-to-recover. There are no effective technologies to involve such reserves in the development now. Standard methods of drilling and operation of inclined wells doesn't allow achieving acceptable oil production rates under these reservoir conditions. Based on the analysis of seismic survey data, correlation of well sections, field information, a geological model of a productive reservoir on the Krasnoleninsky arch was created. The multi-step hydrodynamic calculations made it possible to clarify the parameters of the profile of horizontal wells, the number and configuration of operations for multi-stage hydraulic fracturing. Based on the results of the research, recommendations were developed to well placement, drilling and well operation for specific field areas in order to increase the oil resource development efficiency.

Analysis of the Possible Consequences of Large-Scale Production of Sand and Gravel Mixture in the Downstream of Large Hydroelectric Facilities Based on Hydrodynamic Modeling (the Votkinsk HPP as an Example)

The authors have presented estimation of possible hydraulic consequences of the large-scale mining of sand/gravel mixtures in the upper part of the Lower Kama Reservoir 9the Votkinsk Reservoir downstream) based on the multi-version computation experiments with the developed hydro/dynamic model of the water body under consideration. This estimation is necessary for development of measures aimed at minimization of negative aftermath and provision of the interest balance between water users. Methods. The work is based on the conjugation of a set of field observations with computational experiments based on hydrodynamic models in 1D and 2D formulations, which make it possible to carry out hydrodynamic calculations for the waves of releases from HPPs. Results. The dynamics of water levels was investigated for various calculation scenarios, graphs were drawn for comparing water levels based on the results of calculations in one- and two-dimensional models for morphometry in 2019 in natural conditions and taking into account the development of deposits of sand and gravel mixtures. The experiments have demonstrated that development of only eight deposits (Volkovsk, Olkhovsk, Sivinsk, Golyanovo, Makarovsk, Upper-Dulesovsk, Simonikhinsk, and Simonikhinsk-2) will cause the necessity (in order to maintain the 3.3 m navigation depth) to increase the discharge to the Votkinsk HPP downstream up to 1800 m3/s or maintaining of continuous 1500 m3/s discharge for at least 24 hours. In the process of the water level graphs comparative analysis, both in one-dimension and two-dimension modeling, one can distinguish three sites with great level subsidence (15-41 cm) due to the large-scale mining of sand/gravel mixture.

Effects of the QCD phase transition on hadronic observables in relativistic hydrodynamic simulations of heavy-ion reactions in the FAIR/NICA energy regime

We investigate hadronic particle spectra and flow characteristics of heavy-ion reactions in the FAIR/NICA energy range of 1 AGeV ≤ Elab ≤ 10 AGeV within a relativistic ideal hydrodynamic one-fluid approach. The particlization is realized by sampling the Cooper-Frye distribution for a grand canonical hadron gas on a hypersurface of constant energy density. Results of the hydrodynamic calculations for different underlying equations of state are presented and compared with experimental data and microscopic transport simulations. The sensitivity of the approach to physical model inputs concerning the initial state and the particlization is studied.