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Abstract

The development of an engineering tool (in the form of a computer model) for solving design and analysis problems related with oil and gas well production operations is discussed. The production operations is discussed. The development of the method is based on integrating the concepts of "Systems Analysis" with the techniques of "Computer Graphics". The concepts behind the method are very general in nature. This paper, however, illustrates the application of the paper, however, illustrates the application of the method in solving gas well completion design problems. The use of the method will save time and problems. The use of the method will save time and improve the efficiency of such design and analysis problems. The method can be extended to other problems. The method can be extended to other design and analysis aspects of oil and gas wells.

Introduction

A well is a conduit from the subsurface reservoir to the surface through which fluids are produced or injected. The effectiveness of produced or injected. The effectiveness of communication between the reservoir (formation) and the well controls the production rates and economics. The well completion is an operation which covers every activity between actual drilling and putting the well on production. The completion technique affects the well productivity, future workover needs and production techniques to be used. The ideal completion minimizes initial and operating costs and provides the most effective flow path for the fluid from reservoir to the surface.

After a well has been drilled and found to have substantial amounts of hydrocarbon reserves present to warrant extraction (or production), the petroleum engineer turns his attention to designing petroleum engineer turns his attention to designing the "optimal well completion system" to produce the reserves based on both economic and production limitations. "Systems Analysis" is one of the recent methods used for the design of optimal well completion systems. In "Systems Analysis," 2-D plots are used as a tool to assist the engineer plots are used as a tool to assist the engineer with the decisions he must make concerning the design for a well's completion.

As will be discussed in the next section, there are two types of problems which can be solved using the "Systems Analysis Approach "Diagnosis Problems and Design Problems. In this paper we are Problems and Design Problems. In this paper we are concerned with second type of problems only, and the purpose of this study is to present a Computer- Graphics-Aided-Systems Analysis method for well completion design. which incorporates the use of modern computers and graphic display systems with the method of "Systems Analysis" in-order to facilitate the completion design decisions. It is also important to note that by using computers the results will be available faster, thus decreasing the time lag between the completion of drilling and well testing and that of putting the well on line for production.

SYSTEMS ANALYSIS

" Systems Analysis" is by-product of space technology. Space scientists and engineers developed methods of problem-solving (design. analysis and planning) to deal with the very complex project of space exploration and they called it "Systems Analysis". It was recognized quickly that the concepts behind the method were so general that they could be applied to any system (mechanical, chemical, petroleum, etc), and this approach of "systems thinking" has been successfully applied to solve some difficult problems in the various branches of engineering problems in the various branches of engineering since.

In the "Systems Analysis" approach a system is considered as made up of components and factors that can be classified into a few basic categories: Objective. Environment, Constraint, Resource, Attribute, Component (Sub-system) and Feed back. By doing so the real nature of the problem/system (what can be changed, what cannot be changed etc) is revealed.

In well completion technology, one of the first applications of "System Analysis" was presented by Proano, Mach, and Brown. It is a method by Proano, Mach, and Brown. It is a method by which a well's producing system is broken down into individual segments. Each of these segments are then defined by different equations or correlations. The equations are used to model the effect of pressure changes and their resultant flow rates.

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