bluuebunny/crossref_metadata_2025_split huggingface dataset:
Better Hole Cleaning In Highly Deviated Wellbores
Authors: Allawi Raed H. , Almahdawi Faleh H. M. 
Published: August 2019

Abstract
Many drilling problems (lost circulation, hurdle in running casing, poor cement jobs, high torque and drag and the necessity of re-drilling and, mechanical stuck caused by cutting accumulation in the wellbore) can be avoided by good hole cleaning during drilling operation especially in directional wells.
In this experimental work, the cutting transport ratio (CTR) in hole inclined (60 degree) from vertical was estimated by using three values of drilling mud viscosities, three annular velocities, two types of cuttings size and two rotation speed of inner pipe (RPM). Note that the rig consisted from PVC outer casing 4 1/2 inch as OD diameter and inner drill pipe 2 inch as OD diameter.
The experimental results showed that the Cuttings Transport Ratio (CTR) increased with increasing the annular velocity and better hole cleaning which obtained from the third velocity (3.247 ft/sec) for all cases. Moreover, increasing the mud yield point (YP) helped to improve the cuttings transport ratio; however increasing the mud yield point slightly affected with increased the annular velocity. Furthermore, it was noticed that the rotation of drill pipe (RPM) is one of the most important parameter for cuttings removal especially in laminar flow and transition flow. The cuttings sizes 1.7 mm are also easier to transport than 3.35 mm cuttings sizes for all cases except low yield point (YP).
The effect of some variables on the removal of synthetic bentonite suspension in water by electrocoagulation using turbidity measurements
Authors: Al-Rubaiey N A , Albrazanjy M G 
Published: August 2019

AbstractElectrocoagulation can be considered as a simple and an efficient method for treating both wastewater and water. In this work, a synthetic bentonite suspension water was treated using this technique to reduce turbidity caused by solid particles pollutants. This process was carried out in a batch glass reactor of 1000 ml operated with aluminium electrodes with and without agitation. The removal efficiency as a turbidity removal procedure has been examined using bentonite clay as a turbidity source. The effects of some parameters such as contact time, and electrolyte concentration on the removal efficiency were investigated and compared. The mixing effect over the range (0-800 rpm) on the removal efficiency was also evaluated. The process was found to achieve excellent turbidity removal with mild mixing (550 rpm). In addition, the effect of using Ultrasonic as a mixing source has also been studied. The lowest residual turbidity was found to be 1.0 NTU for the samples with initial turbidities of 500 NTU. Similar final turbidity of 1.0 NTU was obtained after 25 min with initial turbidity of 200 NTU. This was obtained at a current of 750 mA, a contact time of 60 min, and a calculated dissolved aluminium concentration of 10 mg/l.
The use of Mixed Bacterial Culture to improve the Biodegradation of Diesel Pollution
Authors: Jabbar N M , Mohammed A K , Jabber S M , Kadhim E H 
Published: August 2019

Abstract
This study was conducted to evaluate the hydrocarbon biodegradation abilities of Enterobacter cloacae, Staphylococcus aureus, Sphingomonas paucimobilis, and Pentoae species which were isolated from different diesel-contaminated soil samples. The isolates were identified by the Vitek 2 system. Fourier-transform spectroscopy (FT-IR) tested the potential of these isolates to biodegrade the diesel according to the peak areas, a significant decrease in the area of the peaks at 2856-2928 cm−1 corresponds to aliphatic hydrocarbons. The appearance of small peaks at 900-1032 cm−1 refers to substituted benzene derivative compounds. An appearance of some new peaks at 3010- 3030 cm−1 which indicate the presence of alcohol (-OH) and ketones (RC=O). A sharp peak appeared at 1712 cm−1 refers to the carbonyl group (C=O). The potential of biological surfactant production was tested using the Sigma 703D stand-alone tensiometer showed that these isolates were biological surfactant producers. The better results of the surface tension reduction test were obtained when using the mixed bacterial culture which reduced the surface tension of the medium from 66 mN/m to 35.15 mN/m. Single isolates and mixed bacterial culture have investigated their ability to degrade 3.0 % (v/v) of diesel as sole source of carbon and energy in Bushnell- Haas medium. The results demonstrated that the bacterial isolates could be effective in biodegradation of diesel spills individually and showed good biodegradation abilities when they are used together in the mixed bacterial culture.
Environmental pollution control emitted from diesel engines by Al2O3 nanoparticles
Authors: Sharif Hamadi Adel , Ghufran Khidhir Ali 
Published: August 2019

Abstract
One of the most important problems for diesel engines is the emissions of nitrogen oxides (NOx) and smoke, the use of emulsification technology is one of the most influential ways to control this emissions. In this present work Aluminum oxide (Al2O3) are blended by rotary-stator homogenizer at three different levels (50,100,150 ppm) with prepared Nano-emulsion at optimum composition and circumstances that are analyzed experimentally by Design Expert software. Alumina nanoparticle with its high thermal conductivity (30−1 Wm K−1 compare to diesel and high calorific value which helps to promote more internal combustion due to making higher thermal efficiency. Direct injection (DI), water cooled four cylinders, in-line, natural aspirated Fiat diesel engine was used and run at a constant speed (1500 rpm) and constant fuel injection pressure (400 bars) with varying the operation load. Multigas analyzer model 4880 was used to measure the concentration of the emission gases such as NOx, unburned total hydrocarbon HC, CO2 and CO. The engine exhaust smoke emissions were measured using the AVL-415 smoke meter. Based on these observations, the rate of CO and NOx would be reduced significantly up to 24 and 5.8 %, at 150ppm to net diesel respectively, noting that the net smoke of diesel would undergo the highest change (up to 26.5 %). The results also indicate a 6.97 % fuel consumption reduction accompanied with 6.2 % improvement in the thermal efficiency, utilizing Al2O3 nanoparticles in blended in Nano-emulsion. Enhancement in break thermal efficiency (BTE), reduction in (NOx) and smoke are noticed after mixing Al2O3 into prepared nano-emulsion.
Modify Chock Performance Equation for Tertiary Reservoir Wells in Khabaz Oil Field
Authors: Jumaah Haider A. 
Published: August 2019

Abstract
Gilbert correlation has been modified to determine the performance of multiphase fluid-flow through the wellhead and choke. The modification present two sets of new correlations based on statistical analysis of 33 production tests data from 12 wells produce from Tertiary Reservoir in Khabaz oil field, first correlation is modified of Gilbert equation to predict liquid flow rates as a function of wellhead flowing pressure, gas-liquid ratio and choke size, the second correlation takes the effect of water cut and sediment (BS & W) as an effective parameter to minimize error. A comparison between the results of each correlation with measured date has been made to select the best correlation to predict flow rate in newly drilled wells. The oil flow rates predicted by the new correlations show excellent agreement with the measured rates and the second modified Gilbert correlation are found to be closest to all ranges of flow rate variables with an average error of 10 % and R2=0.9493.
Dynamic model of Tertiary reservoir in Khabaz Oil field
Authors: Mousa Mohamad B. , Qader Nabaz 
Published: August 2019

Abstract
This study deals with building a reservoir model for Tertiary reservoir in Khabaz oil field and calculate oil and gas in place by volumetric method using Petrel RE software and by Dynamic method through material balance by using MBAL software, testing the reservoir dynamic model through history match over 26 years, and predicted (4) case of reservoir and well performance over 29 years start at the end of history match (1/1/2016 ) until (1/1/2045) by natural depletion for case-1 Do nothing (current producing wells), Case-2 Base case (work over non-producing wells) case-4 new wells ( drill 6 new wells) and add water injection for case-3 (drill 7new water injector wells).
A New Algorithm for Foot-By-Foot Permeability and Irreducible water Saturation Estimation in Iraqi Limestone Reservoirs
Authors: Haider Qays M , Ruya Ahmed G 
Published: August 2019

Abstract
This paper discusses the methodology developed for petrophysical modeling and its application to the main limestone formations in the Mid-region of Iraq. The systematic approach presented in this study evaluates not only combination of porosity, permeability and irreducible water saturation at each depth, but also free-water level and capillary pressure curve, such that water-cut of flow tests is closely reproduced in numerical simulation. It is one of the major achievements in this study. The algorithm matched to several sets of core samples: 2,903 porosity, 2,767 permeability, and 95 Irreducible water saturation samples that give the algorithm the robustness for future properties prediction. To develop the prediction Algorithm, it was employed multiple regression analysis (MRA) which mathematically requires independence between explanatory variables. Since possible explanatory variables (porosity, permeability and facies) indicate interdependency, it was investigated when necessary to transform the variables into independent axes. It was found that logarithm of permeability has correlations positive to porosity and FZI and negative to irreducible water saturation. Therefore, foot-by-foot evaluation shall meet the following conditions, (Sw) along wells shall be explained by single free-water level (FWL) for each pressure compartment and Water-cut observed on production test shall also be closely simulated with the FWL, For modeling purposes, Sw is split into irreducible water saturation (Swir) and transitional (mobile) water saturation (Swm) as water-cut is a function of only the latter.
Evaluation of Formation Capacity and Skin Phenomena of Mishrif Reservoir -Garraf Oil Field
Authors: Baker H A , Al-Rikaby A , Salih I S 
Published: August 2019

Abstract
Mishrif Formation is the main reservoir in Garraf Oil Field. It is divided into three productive units (M1, L1.1, and L1.2), the unit L2 contains a very small percentage of oil with high majority of water so it is considered to be of a non-economic feasibility. Developing of such reservoir requires a study of its capacity and how the effective communication properties changes laterally. Build up pressure testing was conducted for five wells (A16P, Ga-1, A4P, B5P and C43P) in Garraf oil field. The data have been analysed by Ecrin Kappa Saphir program and well behaviour was detected by pressure and pressure derivative responses (or signature) with time. The results show a difference in capacity with good flowing capabilities. All the wells exhibit a negative skin factor due to stimulation
The effect of coarse aggregate inclusion on the performance of reactive powder concrete exposed to oil products
Authors: al-Attar T S , Ali A S , Al-Numan B S 
Published: August 2019

Abstract
Reactive powder concrete, RPC, is an ultra-high strength and high ductility cementitious composite with advanced mechanical and physical properties. RPC is composed of very fine powders (cement, sand, quartz powder and silica fume), steel fibers (optional) and superplasticizer. A basic principle, which was presented by the first developers of RPC, is to eliminate the coarse aggregate in mixture to enhance homogeneity. The main purpose of the present investigation is to modify RPC by including natural graded coarse aggregate in the mixture in different approaches. The investigation was devoted to monitor the strength development, total absorption and permeability of RPC after exposure to two types of oil products, kerosene and gas oil, up to 180 days. The current results showed that eliminating coarse aggregate as a principle could be gone-beyond. The better way for including coarse aggregate in RPC was to replace the fine sand and the most useful FA/A ratio is expected to be within the range of 0 - 25 % by weight. This range was found to create an optimum situation between strength and absorption for kerosene and gas oil exposures. It is not recommended to include the coarse aggregate in RPC mixtures as a replacement to the binder specially when dealing with oil products storage.
Optimization of the output device of a disk pump for high viscous fluid
Authors: Cheremushkin V , Polyakov A 
Published: August 2019

Abstract
In this paper the problem of designing an output device for dynamic pumps operating at a high fluid viscosity on the example of a disk pump was considered. The main objective of the study was to increase the pump efficiency by optimizing the geometry of the wet part of its volute. The dependences of the efficiency on the geometrical parameters of the output device estimated section were obtained. The results of the study are represented in a form of graphs and scalar field distributions.
Finding the minimum number of optimization points for an axial aircraft pump
Authors: Protopopov A , Mukhlaeva A , Vdovin D 
Published: August 2019

Annotation
This article discusses issues related to the calculation of aircraft axial pumps. These pumps are subject to ever-increasing demands due to high competition in the aviation industry. The highest requirements for parameters are the dimensions of the impeller and power consumption. This article discusses the method of constructing the diameter of the impeller - the expended power of an axial pump.
Optimization of a radial guide device with a no-vane transfer channel
Authors: Isaev N , Valiev T , Morozova E , Bondareva D 
Published: August 2019

Abstract
Various studies show that the centrifugal multistage pump guide vanegreatly determines the hydraulic efficiency of the pump and, as a result, the optimal mode of its operation. In order to increase the pump efficiency, the radial guide vane with a no-blade transfer channelwas optimized. Three geometrical parameters and the number of channels of the guide vanewere chosen as optimization parameters; the hydraulic efficiency was the optimization criterion. 128 computational models were made, and the efficiency values at the operating point were obtained by the method of hydrodynamic modeling. As a result, significant increase in the pump efficiency was achieved.
On the centrifugal pump optimization question
Authors: Tkachyk V , Atamas V , Shablovskiy A 
Published: August 2019

Abstract
There is a wide range of rotor rotational frequencies and cavitation cavitatin margins used in the industrial centrifugal pumps. The effect of these parameters on the dimensions criteria and cavitation characteristics of a pump is studied in this paper, the Sobol method is proposed for it and the task is to find the minimum number of point sat which the best ratio of the parameters will be achieved.
Optimization of centrifugal pump radial guide vanes
Authors: Morozova E , Bondareva D , Shablovsky A 
Published: August 2019

Abstract
Centrifugal multi-stage pump hydraulic efficiency and, as a result, its optimal mode of operation depend primarily on guide vanes. Radial crossover guide vanes were optimized in order to increase pump hydraulic efficiency. Three geometric parameters and the number of guide vane channels were chosen as optimization parameters, and pump hydraulic efficiency was chosen as the criterion. Automatic parameterized design method produced 128 design models; hydraulic efficiency in work mode was calculated with the help of hydrodynamic simulation. Optimization brought about significant increase of pump hydraulic efficiency.
Comparison of various simulation methods of a two-phase flow in a multiphase pump
Authors: Boyarshinova A , Lomakin V , Petrov A 
Published: August 2019

Annotation
The article presents a mathematical model of a two-phase flow in a multiphase helico-axial pump. In this paper, the model of a multiphase incompressible fluid flow (ρ = const) were used. Numerical simulation is based on solving discrete anagoges of the basic hydrodynamic equations. The hydrodynamic simulation of the described mathematical model was performed in two ways: in a simplified form, using a multiphase volumeoffluid model (VOF), and the segregated flow method. The results of the calculation of two-phase flows for various values of the gas contaent are given. The influence of gas content on the pump performance and its pressure is considered. A comparison of calculation results of two methods of hydrodynamic simulation of two-phase flow is shown.
Mathematical modeling and analysis of the electrohydraulic actuator with the throttle control
Authors: Sosnovsky N , Ganieva D 
Published: August 2019

Annotation
High demands to modern electrohydraulic actuators are placed. This applies to the static and dynamic characteristics of the drives, which is achieved by using different correcting devices (controllers). In the article analysis of the most effective regulator for an electro-hydraulic actuator is conducted during the comparison of its dynamic characteristics at introduction of various types of correcting devices: the introduction of state controller, the introduction of additional pressure feedback and a proportional controller. Block diagrams of the electrohydraulic actuator are constructed according to the corresponding mathematical models. The optimization of the control parameters was carried out to improve the static characteristics of the actuator.
Quad bike frame dynamic load evaluation using full vehicle simulation model
Authors: Vdovin D , Chichekin I , Ryakhovsky O 
Published: August 2019

Abstract
The paper describes a quad bike multi-body model intended to extract maximum dynamic forces acting on the vehicle frame. This complex full-vehicle model includes all essential systems such assuspension, steering, frame, power train, brakes, payload, as well as tire-road interaction model. A number of the quad bike operation events has been simulated. Time histories of the forces acting on the vehicle frame and tire contact patch have been analyzed and load cases with maximum forces have been extracted for subsequent finite-element analysis of the frame. In case the sufficient number of the events is simulated, the load cases can be used in the design optimization process, such as topology optimization, at early stages of the frame development.
Light frame design for quad bike using topology optimization
Authors: Vdovin D , Levenkov Y , Chichekin V 
Published: August 2019

Abstract
The paper describes a quad bike frame design procedure with the use of topology optimization technique. The design space specific properties, quad bike specific load cases and problem formulation for topology optimization are presented. Topology optimization results – beneficial load paths of the frame structure – have been interpreted into a new frame design providing sufficient space for placement of all systems of the vehicle. The new frame strength has been proved using finite element method. Comparing with the previous steel frame design, the new frame of the quad bike has become 2 times as stiff and 17% lighter while having low stress levels due to the substitution of aluminum material for steel and a new optimized topology of the frame load-bearing structure.
Mathematical model of interaction of a rolling elastic wheel with elastic-visco-plastic support base taking into account the history of loading
Authors: Zhileykin M , Zakharov A , Panshin M 
Published: August 2019

Abstract
One of the main methods to predict permeability is a simulation of the motion of wheeled vehicles in different operating conditions, which are based on mathematical models of interaction between elastic tires with deformable irregularities of the support base. Currently in the theoretical study of the interaction of propellers with the ground formed two main directions: analytical method involving a mathematical description of the process under study and the finite element method based on computer simulation. The aim of this study is to develop a mathematical model of rolling elastic wheels on deformable rough reference base, taking into account the deformation of the contact patch at each end of the elementary playground. A mathematical model of the curvilinear rolling of the elastic wheel on an uneven elastic-visco-plastic support base is developed, taking into account the deformation of the contact spot in each finite elementary site; the influence of ground hooks on the parameters of the wheel movement; coupling properties of the support base in the horizontal direction under the action of a vertical load; change in the direction of radial and tangential reactions; elastic- visco-plastic properties of the support base;“history” of loading of each elementary platform of the support base; condition of the support base on its physical and mechanical characteristics.
Comparison of various simulation methods of a two-phase flow in a multiphase pump
Authors: Boyarshinova A , Lomakin V , Petrov A 
Published: August 2019

Annotation
The article presents a mathematical model of a two-phase flow in a multiphase helico-axial pump. In this paper, the model of a multiphase incompressible fluid flow (ρ = const) were used. Numerical simulation is based on solving discrete analogues of the basic hydrodynamic equations. The hydrodynamic simulation of the described mathematical model was performed in two ways: in a simplified form, using a multiphase volume of fluid model (VOF), and the segregated flow method. The results of the calculation of two-phase flows for various values of the gas content are given. The influence of gas content on the pump performance and its pressure is considered. A comparison of calculation results of two methods of hydrodynamic simulation of two-phase flow is shown.
Study of the corrosion rate of the paths walls of aluminum heat exchangers in the ethylene glycol antifreezes environment under developed aeration of power fluid
Authors: Petrov A , Saatashvili G , Averianov A , Bilenko I 
Published: August 2019

Annotation
An experimental and theoretical research work on the corrosion processes of heat exchanger channels made from different aluminum alloys in an ethylene glycol antifreeze environment conducted by the authors is described in the article. The hydrodynamic simulation of the flow in the paths was performed. Significant effects of the aeration of the power fluid, the possibility of electrochemical corrosion are proved. The comparative of anti-corrosion property of different aluminum alloys is shown when operating in a wide range of power fluid velocities and temperatures.
Investigation of the performance of the oil gas separator depending on the gas content of the pumped liquid. Development of methods for optimizing the geometry of flow-through parts of centrifugal gas separators
Authors: Ershov M , Lomakin V 
Published: August 2019

Annotation
This article formulates the problems of using oil separators in the current conditions of well operation, as well as research and pilot implementation of innovative oil production technologies. A variant of the improved flow part of the separator was proposed, a mathematical model was written for its further calculation, and the hydrodynamic calculation itself was carried out, the results of which will later be used to study methods for optimizing the geometry of flow parts of centrifugal gas separators.