DETERMINATION OF OPTIMAL NUMBER OF WELLS FOR RATE TRANSIENT ANALYSIS FROM ECONOMIC POINT OF VIEW

2020 ◽  
pp. 37-40
Author(s):  
V.A. Iktisanov ◽  
◽  
A.F. Yartiev ◽  
Keyword(s):  
Transient Analysis ◽  
Optimal Number ◽  
Point Of View ◽  
Economic Point ◽  
Rate Transient Analysis

Explicit Determination of Reserves for Variable-Bottomhole-Pressure Conditions in Gas Rate-Transient Analysis

SPE Journal ◽  
2019 ◽  
Vol 25 (01) ◽  
pp. 369-390 ◽  
Author(s):  
Yang Wang ◽  
Luis F. Ayala
Keyword(s):  
Transient Analysis ◽  
Gas Flow ◽  
Hyperbolic Equations ◽  
Analytical Models ◽  
Pvt Properties ◽  
Reservoir Properties ◽  
Rate Transient Analysis ◽  
Straight Line ◽  
Bottomhole Pressure

Summary Current rate-transient-analysis tools for gas wells producing under boundary-dominated-flow (BDF) conditions largely rely on the deployment of the Arps empirical decline models (Arps 1945), or liquid-based analytical models rewritten in terms of pseudofunctions. Recently, Stumpf and Ayala (2016) demonstrated that, contrary to common practice, decline exponents (b) used in Arps’ hyperbolic equations when applied to gas-well analysis can be rigorously estimated before any field-production data are collected. This determination is solely dependent on gas pressure/volume/temperature (PVT) properties and prevailing constant-bottomhole-pressure (BHP) specification for volumetric, single-phase gas-flow conditions. In the study, we extend that work to a more-realistic variable-BHP condition, which is the most common production-specification condition, in terms of the ratio of changing BHP to average reservoir pressure. The decline exponent (b) is thus rederived, and it is shown that under such conditions, variable BHP hyperbolic decline coefficients become solely dependent on fluid PVT properties and take their largest possible magnitude compared with constant-BHP production. Step-by-step analysis procedures are presented that enable explicit and straightforward estimation of original gas in place (OGIP) and other reservoir properties by universal-type-curve and straight-line analysis. Finally, several cases using simulated and field data are discussed in detail to validate the capabilities of the proposed approach.

scholarly journals The Influence of Port Tugs on Improving the Navigational Safety of the Port

2021 ◽  
Vol 9 (3) ◽  
pp. 342
Author(s):  
Vytautas Paulauskas ◽  
Martynas Simutis ◽  
Birute Plačiene ◽  
Raimondas Barzdžiukas ◽  
Martynas Jonkus ◽  
...  
Keyword(s):  
Evaluation Methods ◽  
High Accuracy ◽  
Optimal Number ◽  
Point Of View ◽  
Search And Rescue ◽  
Economic Point ◽  
Theoretical Methods ◽  
Safety Issues ◽  
Port Operations ◽  
Capacity Evaluation

Port tugs are an important element in port activity and navigational safety issues. Port tugs ensure the safety of big ships while they are entering, manoeuvring, mooring and unmooring, and are of huge importance during other port operations. At the same time, optimizing the number of port tugs and tug bollard pull is also important from a port navigational safety and economic point of view. Calculation and evaluation methods of the optimal request for tugs bollard pull, in particular, port operations, are very important in order to guarantee the navigational safety of the port and ships during the main ship operations in the port. This article provides the number of requested port tugs and bollard pull calculation and evaluation methods on the basis of forces and moments acting on ships. On the basis of real ship voyages and manoeuvring at ports data as well as high accuracy simulators, theoretical methods were used, which were followed by our conclusions and recommendations, which can be used by port harbour masters and tug companies. Modern tugs have become an important element and integral part of modern port navigational safety. Such modern port tugs are also used for navigational safety and other important port functions and activities, such as fire protection and search and rescue operations. The optimal number and capacity evaluation of port tugs depending on port capacity and conditions are studied in this article.

scholarly journals To Interpret Rate Transient Analysis for the Determination of Reservoir Properties

2019 ◽  
Vol 8 (4) ◽  
pp. 1508-1511
Keyword(s):  
Production Rate ◽  
Transient Analysis ◽  
Transient Flow ◽  
Curve Analysis ◽  
Late Time ◽  
Type Curve ◽  
Rate Transient Analysis ◽  
Decline Curve ◽  
Time Period

Rate-time decline curve analysis is a major technique which is mostly used in petroleum engineering. Many methods are used for the determination of the decrease in the production rate within a given period of time. The main disadvantage of Arp’s decline type curve analysis is that it is only used for boundary dominated flow period; it is not used for transient flow period. The analysis of the Fetkovich is to determine the log-log type curve for both the transient flow period (early time period or infinite) and boundary-dominated flow period (late time period). Arps developed the type curve which shows the production rate decline with time for the finite reservoir or late time period. The exponential or constant flow decline, hyperbolic decline, and harmonic decline according to the value of decline curve exponent (b) is given by Arps. After that Fetkovich improved on earlier work done by Arps in predicting decline production rate of wells over a given period of time. The main objective of this study was to plotting the rate transient analysis curve. I will plot the Fetkovich type curve (combined early and late times region). The graph will be plotted between the dimensionless decline flow rate (qDd) and the dimensionless decline time” (tDd). This will be the objective of the study.

scholarly journals Determination of adhesion stages of the Fe-Ni ore at the Ferronikeli plant in Drenas

2020 ◽  
pp. 37-42
Author(s):  
Zarife Bajraktari-Gashi ◽  
Muharrem Zabeli ◽  
Erard Morina
Keyword(s):  
Point Of View ◽  
High Moisture Content ◽  
High Moisture ◽  
Economic Point ◽  
X Ray ◽  
Nickel Ores ◽  
Iron Nickel ◽  
Rotary Kilns ◽  
The University

Abstract: Purpose. The process of calcine production in rotary kilns at the Ferronikeli plant in Drenas is realized with great difficulties as a result of the formation of large adhesions in the areas of rotary kilns. So far, the removal of load adhesions during the work process inside the rotary kilns is achieved only by their physical removal. The purpose of the paper is to determine the factors in reducing adhesions in the process of calcine production in the areas of rotary kilns, in the Ferronikeli plant in Drenas. Methodology. Chemical analysis of iron-nickel ore. The determination of the composition of the adhesives was performed with the X-RAY device, in the laboratory of the Ferronikeli plant. Method with the software Calphad 2020, at the University of Ljubljana. Findings. From the composition of iron-nickel ore, the composition of adhesives in rotary kilns, we manage to determine the thermodynamic phases and exothermic and endothermic processes that take place in the process of rotary kilns. From the determinations of the composition of the adhesives in the software alphad 2020, we manage to determine one of the factors that affect the formation of adhesives based on the stages during the process, which do not have a stability, as a result of high moisture content of iron-nickel ores. Originality. Based on the study at the Ferronikeli plant, shovels were placed on the walls of the rotary kilns in the three areas, the removal of fireclay bricks, the placement of anchored concrete and the project for the placement of two kilns for kiln ore were started. Practical value.The placement of the shovels has increased the temperature inside the rotary kilns. While the placement of dryers will have an impact on reducing the adhesions inside the rotary kilns and from the economic point of view, we will have a reduction of fuels in the load of the rotary kilns.

scholarly journals Characterizing the level of economic development of countries

2019 ◽  
Vol 1 (1) ◽  
pp. 343-354
Author(s):  
Alexandra Nastu ◽  
Stelian Stancu ◽  
Andreea Dumitrache
Keyword(s):  
Economic Development ◽  
Composite Index ◽  
Principal Component ◽  
Developed Countries ◽  
Optimal Number ◽  
Point Of View ◽  
Economic Point ◽  
Development Level ◽  
Level Of Economic Development ◽  
Different Levels

Abstract The main purpose of this paper is to provide an objective analysis of the economic development level of countries. This is done by measuring it through a new index and by classifying the countries in an optimal number of clusters, each group characterizing different levels of economic development. The proposed methodology is based on three steps: creating a composite index (by applying the principal component analysis), establishing the optimal number of development groups (based on the number of principal components and on the hierarchical clustering) and clustering countries into them (with the help of k-means analysis). Therefore, this approach solves the difficulty of classifying the countries, complication that is mentioned in the specialized literature. Also, the paper creates a better understanding on the economic development level of countries, as, usually, the papers examine the economic growth level of countries. The analysis is conducted at the level of 60 countries for year 2015, using 12 indicators from categories that influence economic development (income, inequality, health, education and living conditions). The empirical results revealed that the countries can be grouped in two groups: economical developed countries (approximatively 2/3) and economic developing countries (approximatively 1/3). The countries that are most developed from an economic point of view are: Singapore, Luxemburg and Finland.

Rate transient analysis of fractured horizontal wells

2020 ◽  
pp. 62-67
Author(s):  
R.R. Urazov ◽  
◽  
A.Ya. Davletbaev ◽  
A.I. Sinitskiy ◽  
A.Kh. Nuriev ◽  
...  
Keyword(s):  
Transient Analysis ◽  
Horizontal Wells ◽  
Rate Transient Analysis ◽  
Fractured Horizontal Wells

Sophie Laws, with Caroline Harper and Rachel Marcus. Research for Development: A Practical Guide. New Delhi: Vistaar Publications. 2003. xiii+475 pages. Paperback. Indian Rupees 450.00.

2003 ◽  
Vol 42 (2) ◽  
pp. 170-172
Author(s):  
Mir Annice Mahmood
Keyword(s):  
Policy Research ◽  
Point Of View ◽  
Basic Question ◽  
New Delhi ◽  
Economic Point ◽  
Scarce Resources ◽  
Is Research ◽  
The Subject ◽  
Development Workers

To implement any successful policy, research about the subject-matter is essential. Lack of knowledge would result in failure and, from an economic point of view, it would lead to a waste of scarce resources. The book under review is essentially a manual which highlights the use of research for development. The book is divided into two parts. Part One informs the reader about concepts and some theory, and Part Two deals with the issue of undertaking research for development. Both parts have 11 chapters each. Chapter 1 asks the basic question: Is research important in development work? The answer is that it is. Research has many dimensions: from the basic asking of questions to the more sophisticated broad-based analysis of policy issues. The chapter, in short, stresses the usefulness of research which development workers ignore at their own peril.

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