Journal of Al-Farabi for Engineering Sciences

A close look at the H-C phase Diagram and Hydrocarbon Reservoir Classification and Behavior

Shamil I. Albassam — Fri, 19 Jan 2024 00:00:00 +0100

H-C phase diagram of reservoir fluids is an important tool used in explaining reservoir fluids behavior during the life period of any reservoir. In this paper, detailed analysis of certain terms of the Pressure–Temperature Diagram (P-T diagram) are presented and discussed. Some of these terms are redefined since the already existing definitions does not fit all cases and conditions of reservoir pressure and temperature, and hence, new definitions are given to such terms so as to make them fit all possible conditions that might exist in the reservoir. Special attention was given to explain and analyze the phase behavior inside the phase envelope (two phase region) of the P-T diagram. Among such terms for example, new definitions and analysis are given to the quality lines to give them much more interest and importance in the P-T diagram as they should be given than just representing the percentages of both liquid and gas phases. The new given definition will open new interpretations and add more interesting and valuable importance to the quality lines. Another new definition is given herein to the Cricondenbar Pressure to make it fit all possible conditions on the P-T diagram since the existing definition does not fit all pressure and temperature conditions. This paper also include some explanations regarding the retrograde gas condensation process and region on the P-T diagram. Finally, the herein mentioned factors and definitions will add more important and wider interpretations and applications for the P-T Diagram for a better understanding of H-C reservoirs. Such interpretations might be applied, also to the fluid flow control inside the reservoir and in the choosing of the best EOR method to apply whenever and wherever it is necessary.

Investigation of Wear Rate of Passenger Airplanes Tyres During Landing

Ali Hasan Hadi, Nadhum Majbil Faleh — Fri, 19 Jan 2024 00:00:00 +0100

A real, functioning copy of one main landing gear wheel is used to show the landing impact of an aircraft. By minimizing abrasive sliding between aircraft tires and runway surfaces right after touchdown, this study seeks to identify possible tire-life improvements. An experimental investigation of size 22 X 5.5, type VII airplane tyres was conducted to evaluate the wear and related properties of temperature and friction caused while braking. One way to evaluate the tire's performance on surfaces with uniform slip ratios, including asphalt, concrete, and slurry seal, was to gear it up to the driving wheel of a ground vehicle. The range of slip ratios often attributed to an airplane's braking system was covered by the data gathered during dry runway operations. Our results show that cumulative tire wear is affected by runway surface features, increases with increasing slip ratio, and changes linearly with miles. The differing wear rates associated with the various surfaces may be used to rank runways based on tire wear.

The Additives Impact the Gel Strength of the Water Based Drilling Mud

Layla S. Al-Jaff, Mohammed Gassab Shamikh — Fri, 19 Jan 2024 00:00:00 +0100

One of the most important functions of drilling mud is its ability to suspend the rock cuttings during drilling cease, this ability is related mainly to gel strength. Gel strength is caused by the attractive forces between the active particles of bentonite (clay) during the static period. Sodium-based bentonite concentration has a direct effect on the gel strength. In addition, cement contaminants may encounter drilling mud as a result of casing string cementation which in turn also leads to a noticeable impact on gel strength. As consequence, it is vital to observe drilling mud gel strength continuously to identify efficient drilling mud functions. In this paper, an experimental study was performed via a shearometer, the aim of this study is to investigate the effect of the variety of the weights of sodium-based bentonite and cement slurries on the gel strength of water based mud. To analyze the influence of bentonite additives, four drilling mud samples were prepared with bentonite weights; 40, 60, 70, and 80 gm respectively, and gel strength was measured at each weight. While cement contamination had been examined by preparing three drilling mud samples contaminated with 2 gm, 3 gm, and 5 gm of class G cement. The results showed that an increase in bentonite quantities leads to rising in gel strength directly. The findings also showed that gel strength increased as the level of cement slurries raised. Furtherer increase appeared from 20.2 to 42 lb/100 ft² when cement weight increased from 2 to 5 gm respectively.

Employing traditional heritage elements in shaping contemporary architecture

Baraa A. Ibraheem, Maitham H. Al-Saffar, Samra S.Ali, Omar.S.Yassin — Fri, 19 Jan 2024 00:00:00 +0100

The architecture of Baghdad suffers from a lot of problems, ranging from the application of materials and form to the expression in contemporary buildings that not only change the traditional architectural identity but also the performance of the buildings that meet the needs of the local population. This unfortunately increases the damage related to cultural values and environmental sustainability regardless of adaptable solutions that can improve the energy efficiency of building performance. The traditional elements of architecture in the city of Baghdad represent a source of inspiration for contemporary architecture and are exploited to enhance its identity and spatial affiliation. The process of exploiting these elements takes place on several levels, including those that achieve environmental, symbolic, or formal aspects. Hence, the research problem crystallizes in the lack of clarity on the levels of benefiting from the elements of traditional local architecture in enhancing the identity of contemporary architecture and its spatial affiliation. The research aims to shed light on how to analyze the components of the performance and value of traditional architecture in the city of Baghdad, which is rich in cultural heritage and which can be translated into contemporary architecture that creates continuity in traditional cultural identity. The study uses the theoretical descriptive approach through which data is collected on the vocabulary of local traditional architecture of the city of Baghdad and its roles at the environmental, formal, and aesthetic levels to arrive at a main vocabulary for the theoretical framework, which is represented in four basic vocabulary represented in the aspects of form formation, dependence on the environment, and the interface. , aesthetic aspect, and cultural value. These vocabulary were applied to two recently elected projects in the city of Baghdad, through which the four indicators and the role of each of them in enhancing the identity of contemporary architecture and its spatial affiliation were analyzed.

Dynamic Characteristics of Continuous Stirred Tank Reactor (CSTR) Part I: Adiabatic Reactor

Abdul-Fattah M. Ali, Khalid Alzamili, Walid M. S. Kassim — Fri, 19 Jan 2024 00:00:00 +0100

CSTR is a very common reactor type which is widely used in the chemical process industries. It is well-known that its dynamics are nonlinear with a multi-mode behavior. This aspect was and still is an active subject of research with the investigative approach being either mathematical or experimental involving specific reaction systems. In this work a different approach is adopted in which the variation of the damping coefficient value of the linearized reactor’s transfer function is investigated over chosen values/ranges of relevant parameters. Our results indicate that an adiabatic type of such a reactor in which a liquid-phase, 1st-order, irreversible, exothermic chemical reaction takes place can be unstable or stable. If stable, it is either critically damped or overdamped with the latter mode being overwhelming; however, it is never underdamped. Furthermore, even when stable its dynamic behavior can be peculiar depending on certain values of some parameters.

Pollution of Water’s direct effect in Iraq on the Public Health & Safety

Ali Abdul Samea Hameed — Fri, 19 Jan 2024 00:00:00 +0100

The devastating effects of pollution of Water are significant, affecting human life, animal life and vegetation at the same time. Recently, Iraq has experienced the effects of pollution of Water, destroying an abundance of plants and many animals. Pollution of Water is one of the mostly deadly and severe problems facing humankind currently. This study analysed the effects of heavy metals Pb, like Cr, Zn and Fe in water for drinking. The findings revealed an upsurge in the number of cholesterol, urea, and white blood cells among people in Basra, Baghdad, and other urban areas. It was also found that these individuals were more likely to have fever, diarrhea, kidneys, and respiratory problems. Recent studies have revealed that pollution of Water in Iraq is caused by a variety of factors, i.e., solid pollutants, chemicals, and microorganisms. Unfortunately, due to the current state of war, there is not much concentration on water treatment plants (WTPs) resulting in a decrease in the quality of the supplied water. Due to the lack of wastewater treatment facilities in most Iraqi cities, sewage is simply discharged into the river. In addition, supply of water and sanitation systems in some major cities have been damaged and the two networks are jointly linked.

A Review on Common Approaches Used for Graphene Characterization

Omar S. Dahham, Khalid Al-Zamili, Nik Noriman Zulkepli — Fri, 19 Jan 2024 00:00:00 +0100