Abstract

The need of oilfield operators to verify that wells are being produced at their optimum capacity and in a cost effective manner is always present. To reduce operating costs, increase oil production and increase net income requires an integrated analysis of the pumping system including the performance and interaction of all the elements: the prime mover, surface equipment, well bore equipment, down hole pump, down hole gas separator and the reservoir. This analysis is to be made based on data obtained at the surface without entering the well bore and must yield an accurate representation of the conditions that exist on the surface, within the well bore and within the reservoir. Examples of rod pumped wells, ESP pumped wells, PC pumped wells and other well analyses are presented.

Introduction

The need to increase oil production and reduce operating costs from wells requires an integrated analysis of the pumping system including the performance and interaction of all the elements: the surface equipment, the down hole equipment, the well bore and the reservoir. The analysis is to be based on data obtained at the surface without entering the well bore and must yield an accurate representation of conditions that exist at the surface, within the well bore, at the sand face and within the reservoir.

Such system analysis can now be undertaken efficiently using portable notebook computer data acquisition systems in conjunction with appropriate sensors and a suite of analysis software. The analysis can be undertaken on beam pumped, electrical submersible pumped, progressive cavity pumped, plunger lift, gas lift, flowing and other types of wells to determine the well's performance so the production rate can be maximized and the operating expenses minimized.

Field experience undertaking such analysis in numerous wells has resulted in the development of a procedure: Total Well Management (or TWM) that insures that good results are obtained with the minimum of effort. Operation of artificial lift wells using the concept of TWM results in a more complete understanding of the performance of a given well. Implementation of this concept can result in significant reductions in operating costs and increased oil production as shown by results of numerous operators in a variety of operating conditions. While this production optimization procedure is broad, the analysis and optimization concept is divided into different sections that include beam pumped wells, electrical submersible pumped wells, progressive cavity pumped wells, plunger lift wells, gas lift wells and other types of artificial lift. The different types of analyses are discussed separately.

Such procedure is greatly facilitated by the use of a fully integrated portable instrument that includes all the necessary sensors, precision analog to digital electronics, computer hardware and software components. This allows immediate analysis of the well performance at the well site. The alternative is to use separate conventional fluid level, dynamometer and power instruments for data acquisition and then combine the results of each test using various application programs. One of the cost-effective advantages of an integrated analysis system is that the well data is entered only once into a data file that all of the programs use to determine well performance.

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