Upon completion of the course, participants will be able to. Petroleum engineering calculations in microsoft excel. Prediction of reservoir performance in multiwell systems. Fekete harmony conventional software tour chapter 4.
This excel spreadsheet plots fetkovich decline curves for gas wells. Course rengdca decline curves analysis ifp training. Decline curves analysis using blasingamestyle type curves 4. We examine the reliability of the uncertainty quantification of reserve estimates by analyzing actual oil and gas wells that have produced to nearabandonment conditions, and also show how uncertainty in. Analyzing well production data using combinedtype curve and decline curve analysis concepts ram g. With help from horizontal wells and hydraulic fracturing, shale gas has made a significant contribution to the energy supply. Analytical decline curve analysis model for water drive gas reservoirs mostafa s abdelkhalek 1, ahmed h elbanbi2 and mohamed h sayyouh3 1reservoir engineer, royal dutch shell, egypt 2cairo universityauc, egypt 3cairo university, egypt keywords. Then, a decline analysis model is derived based on reservoir characteristic parameters and used to analyze natural decline rates for the xiaermen oilfield developed by waterflooding. The effective decline factor d is a stepwise function that is in better agreement with data recording practices. Advanced production decline analysis and application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several decline methods, such as arps. Production decline curve an overview sciencedirect topics. The arps declinecurve analysis is only applicable when production is in boundarydominated flow, so the early production of a well, when production is in transient flow, is not analyzable. Study on the decline analysis of oil well stimulation rule. Fetkovich 1968 improved on earlier work by arps in predicting the declining production rate of oil and gas wells.
Analysis of production decline curves spe book store. Quantification of uncertainty in reserve estimation from. Petroleum related trade journals and statistical yearbooks from various oil com. The fetkovich type curve is the most widely used and referenced tool in papers on this topic. Pdf decline curve analysis using type curves semantic. Approaches of decline curve analysis used for naturallyfractured reservoirs developed by water flooding have been few. Original oil in place values calculated from ratetime analysis for individual wells are used with recoverable reserve projections from the decline analysis to obtain fractional recoveries for each well. Fetkovich recognized that decline curve analysis was only applicable during the depletion period ie. Prediction of reservoir performance applying decline curve analysis. Advanced production decline analysis and application in. Decline curve analysis dca is a graphical procedure used for analyzing declining production rates and forecasting future performance of oil. Fetkovich dca decline curve analysis course youtube.
To this end, a decline analysis model derived based on fluid flow mechanisms was proposed and used to analyze the oil production data from naturally fractured. Because his method was rapid and easily apflied, it was used extensivelyby ikunsayin his evaluation of some 200 wells to determine the distribution o the decline curve exponent term b. A decline curve analysis model based on fluid flow. For shapes with ca decline to 40% of the initial boundarydominated. Fetkovich used analytical flow equations to generate type curves for transient flow, which he combined with the empirical declinecurve equations. In this paper, we present an advanced technique for the probabilistic quantification of reserve estimates using decline curve analysis. Analysis methods traditional background for traditional analysis decline curve analysis is a graphical procedure used for analyzing declining production rates and forecasting future performance of oil and gas wells. Similar to the fetkovicharps normalized matching analysis procedure, the blasingame curve matching analysis procedure of oil well is listed below. When n is zero, the decline rate is constant which is the exponential decline.
Decline curve analysis is the most currently method used available and sufficient 1. Production declinecurve analyses are the most widely used tool in the industry for oil and gas reservoir production analyses. Prediction of reservoir performance applying decline curve. Types of decline analysis in production forecasting. Advanced production decline analysis and application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several decline methods, such as arps, fetkovich, blasingame, agarwalgardner, npi, transient, long linear flow, and fmb. Fetkovich multipoint testing gas wells 20160331 part 2 whitson academy. Decline curve analysis models are frequently used but still have many limitations. For exponential decline it is a constant with time.
His work in decline curve analysis is another example of applying all available information to solve problems. Basic concepts in decline curve analysis by mike fetkovich table of contents tape 1 click here to watch the entire fetkovich course from beginning to end of tape 1. Abstract arps type curves could only be used to analyze the data in the period of boundarydominated flow. Conventional declinecurve analysis should be used only when mechanical conditions and reservoir drainage remain constant and the well is producing at capacity 2. Discussion and study guide spe 4629 decline curve analysis using type curves m. In recent years, production decline curve analysis has become the most widely used tool in the industry for oil and gas reservoir production analysis. Decline curve analysis is a long established tool for developing future outlooks. Methods of decline curve analysis for shale gas reservoirs. Analyzing the decline curve can be a more straightforward way to. Fetkovich multipoint testing gas wells 20160331 part 2. Advanced production decline analysis and application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several.
Fetkovich decline curve analysis excel calculations. An advanced approach for declinecurve analysis, which is applicable for changes in pressure or. In recent years, production declinecurve analysis has become the most widely used tool in the industry for oil and gas. Decline curve analysis predicts the decline in production rates of gas and oil wells as they age. Fetkovich used analytical flow equations to generate typecurves for transient flow, which he combined with the empirical decline curve equations. Formation factor and remaining oil saturation are included in this model, which reveals nonlinear relationships between natural decline rates and the production time. Comparison of empirical decline curve analysis for shale wells a thesis. The multiplicity of fetkovich arps decline curve analysis as a result, the fetkovich arps decline analysis method is fit for the condition when the well is producing with constant bhfp, and the type curve could not be used until it reaches the period of boundarydominated flow.
An advanced approach for declinecurve analysis, which is applicable for changes in pressure or drainage, has been presented by fetkovich, 14. Analyzing well production data using combinedtypecurve. Decline curve analysis has been called the most commonly used and misused technique for forecasting future production and remaining reserves. The applicable decline for the purpose of reservoir estimates is usually based on the historical trend that is seen on the well or reservoir performance. Decline curve analysis using type curves evaluation of well performance behavior in a multiwell reservoir system. Decline analysis curve an overview sciencedirect topics. Fetkovich used analytical flow equations to generate typecurves for transient flow, which he combined with the empirical decline curve equations originally documented by j. How to keep the coronavirus out of your houseim a surgeongiving you real tips docs are using duration. Decline curve analysis is an empirical procedure that predicts the decline in production rates of gas and oil wells. The type curves based on the arps equations are used for production decline analysis good for the pseudo steadystate phase. Advanced production decline analysis and application, sun.
The decline curve is a method for estimating reserves and predicting oil and. Fekete harmony conventional software tour chapter 6 flowing material balance duration. Fetkovich transient and arps decline curve analysis techniques, methods to amend a nonconverging production curve to force it to the economic limit, reinitializing decline curves, material balance time, and real time relationships will also be covered throughout the duration of this course. Fetkovich decline curve analysis this excel spreadsheet plots fetkovich decline curves for gas wells. Fetkovich introduced the idea of applying loglog type curve analysis to singlewell analysis for both. In solution gas drive reservoirs, decline curve of a low permeability volatile oil field located analysis of ratetime data for predicting future in campbell county. Analysis of production decline curves steven w poston.
A curve fit of past production performance is done using certain standard curves. Production forecasting decline curve analysis petrowiki. Under what conditions should the fetkovich type curve procedure work just as well for a group of wells e. This study compares four recently developed decline curve methods and the traditional arps or fetkovich approach. Nominal decline is a continuous function and it is the decline factor that is used in the various mathematical equations relating to decline curve analysis.
Decline curve analysis is a means of predicting future oil well or gas well production based on. Ihs markit reservoir engineering solutions 1,264 views. Advanced production decline analysis and application 1st edition. When n is one, the decline rate is proportional to the rate which is the harmonic decline. The empirical arps decline equationswere employed for a long time by different vl liquid production rate with water cut in xiaermenoilfield fig. Several early publications related to declinecurve analysis have appeared in the literature 257262. This remains an important tool for the reservoir engineer, so that the practice of decline curve analysis has been. Advanced production decline analysis and application. Modified hyperbolic and power law exponential production decline curves. A practical systematic introduction to each method helps the reservoir engineer understand the physical and mathematical models, solve the type curves and match up analysis, analyze the processes and examples, and reconstruct. Unit conversion in petroleum office is based on unitconverter. However, formatting rules can vary widely between applications and fields of interest or study. This book will serve as an authoritative reference on modern production declinecurve analyses, including details of some recent advances in the technology. It is a semianalytical approach in that type curves are generated from analytical solutions of transient infinite radial systems at constant flowing pressure, while the boundarydominated flow period is defined using hyperbolic decline typecurves, originally developed by arps.
The fetkovich typecurve analysis spe 004629, 1980 was the first analysis method to use analytical typecurve matching for production data. To this end, a decline analysis model derived based on fluid flow mechanisms was proposed and used to analyze the oil production data from. The most popular decline curve is that which represent the decline in the oil or gas. A new direction for decline curve analysis was given by slider2 with his development of an overlay method to analyze ratetime data. The fundamental assumption in fetkovich transient analysis is a constant. A practical systematic introduction to each method helps the reservoir. This course will give the learner a better understanding of how fundamental reservoir properties and drive mechanisms affect the shape of the production decline curve and how to avoid many of the mistakes. Advanced production decline analysis and application 1st. Productivity indexes and flow equations for oil and gas, vertical and horizontal wells, steady state, pseudosteady state and transient flow conditions. By the aid of this knowledge the value of a property may be judged, and proper depletion and depreciation charges may be made on the books of. Case study of a lowpermeability volatile oil field using. Decline curve analyses are usually based on empirical arps equations. However, most curve analysis is done by computer today, promoting a blackbox approach to engineering and leaving engineers with little background in the fundamentals of decline analysis.
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