Discussion and study guide spe 4629 decline curve analysis using type curves m. Comparison of empirical decline curve analysis for shale wells a thesis. Study on the decline analysis of oil well stimulation rule. Unit conversion in petroleum office is based on unitconverter. Advanced production decline analysis and application 1st edition. Case study of a lowpermeability volatile oil field using. 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. Decline curve analysis has been called the most commonly used and misused technique for forecasting future production and remaining reserves. Decline analysis curve an overview sciencedirect topics. 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 1968 improved on earlier work by arps in predicting the declining production rate of oil and gas wells. 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.
Fetkovich used analytical flow equations to generate typecurves for transient flow, which he combined with the empirical decline curve equations. Decline curve analysis is a means of predicting future oil well or gas well production based on. Analysis of production decline curves steven w poston. Decline curve analysis is an empirical procedure that predicts the decline in production rates of gas and oil wells. This remains an important tool for the reservoir engineer, so that the practice of decline curve analysis has been. Conventional declinecurve analysis should be used only when mechanical conditions and reservoir drainage remain constant and the well is producing at capacity 2. 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. Decline curve analysis is a long established tool for developing future outlooks. Formation factor and remaining oil saturation are included in this model, which reveals nonlinear relationships between natural decline rates and the production time. Decline curve analysis using type curves evaluation of well performance behavior in a multiwell reservoir system.
Fetkovich introduced the idea of applying loglog type curve analysis to singlewell analysis for both. Decline curve analysis models are frequently used but still have many limitations. Under what conditions should the fetkovich type curve procedure work just as well for a group of wells e. In recent years, production declinecurve analysis has become the most widely used tool in the industry for oil and gas. Modified hyperbolic and power law exponential production decline curves.
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. Abstract arps type curves could only be used to analyze the data in the period of boundarydominated flow. The fetkovich typecurve analysis spe 004629, 1980 was the first analysis method to use analytical typecurve matching for production data. Analyzing the decline curve can be a more straightforward way to. This book will serve as an authoritative reference on modern production declinecurve analyses, including details of some recent advances in the technology. For shapes with ca decline to 40% of the initial boundarydominated. Advanced production decline analysis and application in. 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. 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. Fetkovich recognized that decline curve analysis was only applicable during the depletion period ie.
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. The most popular decline curve is that which represent the decline in the oil or gas. A curve fit of past production performance is done using certain standard curves. The type curves based on the arps equations are used for production decline analysis good for the pseudo steadystate phase. Fetkovich multipoint testing gas wells 20160331 part 2.
Methods of decline curve analysis for shale gas reservoirs. 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. Productivity indexes and flow equations for oil and gas, vertical and horizontal wells, steady state, pseudosteady state and transient flow conditions. 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. A decline curve analysis model based on fluid flow. Fekete harmony conventional software tour chapter 4. Prediction of reservoir performance applying decline curve. Types of decline analysis in production forecasting. Fetkovich decline curve analysis this excel spreadsheet plots fetkovich decline curves for gas wells. This study compares four recently developed decline curve methods and the traditional arps or fetkovich approach. Advanced production decline analysis and application, sun. Several early publications related to declinecurve analysis have appeared in the literature 257262. Advanced production decline analysis and application. Ihs markit reservoir engineering solutions 1,264 views.
However, formatting rules can vary widely between applications and fields of interest or study. 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. The fetkovich type curve is the most widely used and referenced tool in papers on this topic. Prediction of reservoir performance applying decline curve analysis. Decline curve analysis predicts the decline in production rates of gas and oil wells as they age. A new direction for decline curve analysis was given by slider2 with his development of an overlay method to analyze ratetime data. 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. Petroleum related trade journals and statistical yearbooks from various oil com. In recent years, production decline curve analysis has become the most widely used tool in the industry for oil and gas reservoir production analysis. 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.
Advanced production decline analysis and application 1st. Decline curves analysis using blasingamestyle type curves 4. 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. The effective decline factor d is a stepwise function that is in better agreement with data recording practices. When n is one, the decline rate is proportional to the rate which is the harmonic decline. Analyzing well production data using combinedtype curve and decline curve analysis concepts ram g. Fetkovich dca decline curve analysis course youtube. Prediction of reservoir performance in multiwell systems. To this end, a decline analysis model derived based on fluid flow mechanisms was proposed and used to analyze the oil production data from. Analyzing well production data using combinedtypecurve. Petroleum engineering calculations in microsoft excel. 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. An advanced approach for declinecurve analysis, which is applicable for changes in pressure or drainage, has been presented by fetkovich, 14.
A practical systematic introduction to each method helps the reservoir. In this paper, we present an advanced technique for the probabilistic quantification of reserve estimates using decline curve analysis. 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. Course rengdca decline curves analysis ifp training. For exponential decline it is a constant with time. 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. 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. Advanced production decline analysis and application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several. Approaches of decline curve analysis used for naturallyfractured reservoirs developed by water flooding have been few. Fetkovich used analytical flow equations to generate type curves for transient flow, which he combined with the empirical declinecurve equations. 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. Fekete harmony conventional software tour chapter 6 flowing material balance duration. Analysis of production decline curves spe book store. Quantification of uncertainty in reserve estimation from.
Fetkovich multipoint testing gas wells 20160331 part 2 whitson academy. With help from horizontal wells and hydraulic fracturing, shale gas has made a significant contribution to the energy supply. 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. Production forecasting decline curve analysis petrowiki.
Decline curve analyses are usually based on empirical arps equations. An advanced approach for declinecurve analysis, which is applicable for changes in pressure or. Fetkovich decline curve analysis excel calculations. The fundamental assumption in fetkovich transient analysis is a constant. The decline curve is a method for estimating reserves and predicting oil and. Decline curve analysis dca is a graphical procedure used for analyzing declining production rates and forecasting future performance of oil. Pdf decline curve analysis using type curves semantic. 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. Production declinecurve analyses are the most widely used tool in the industry for oil and gas reservoir production analyses. His work in decline curve analysis is another example of applying all available information to solve problems. Decline curve analysis is the most currently method used available and sufficient 1. 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. Upon completion of the course, participants will be able to. The empirical arps decline equationswere employed for a long time by different vl liquid production rate with water cut in xiaermenoilfield fig.