Enhanced oil recovery as a stepping stone to carbon capture. Abstract arps type curves could only be used to analyze the data in the period of boundarydominated flow. The proposed discussion and workshop consists of 6 major subjects with attendant work problems. Production decline analysis is a traditional means of identifying well production problems and predicting well performance and life based on real production data. Depletion has a fundamental role in the extraction of finite resources and is one of the driving mechanisms for oil flows within a reservoir. Comparison of empirical decline curve analysis for shale wells a thesis. In recent years, production declinecurve analysis has become the most. Although this suspicion cannot be confirmed by a single comparison, it is instructive to compare woodcuts in the japanese hasshu gafu of the same period with its chinese source to discover a very similar. Decline curve analysis using fetkovichstyle type curves.
In recent years, production declinecurve analysis has become the most widely used tool in the industry for oil and gas reservoir production analysis. Before the availability of computers, decline curve analysis was performed by hand. As a result, the fetkovicharps 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. Pdf verification of decline curve analysis models for. It uses empirical decline models that have little fundamental justifications. Decline curve analysis three basic decline curve equations all of the equations give you the ability to predict cumulative production or production rate at some point in time. Ratetime decline curve analysis is a major technique which is mostly. Advanced production decline analysis and application. Advanced production decline analysis and application 1st edition. To interpret rate transient analysis for the determination of. If you have a fairly fast connection, you may wish to download the entire package. We would like to clarify that our study and the discussions in this article are limited to twophase fluid flow. Mathematics the arps decline curve analysis approach4 was proposed nearly sixty years ago. Fetkovich introduced the idea of applying loglog type curve.
The most popular decline curve is that which represent the decline in the oil or gas. Decline curve analysis for low permeability gas condensate. Decline curve analysis is an empirical procedure that predicts the decline in production rates of gas and oil wells. Analysis of production decline curves poston, steven w. In recent years, production declinecurve analysis has become the most widely used tool in the. Arps 1945 introduced the decline curve analysis method using mathematical equations. This analysis uses three methods for predicting the deline of a reservoir, exponential, harmonic and hyperbolic. Prediction of reservoir performance applying decline curve analysis. Decline curve analysis dca is a graphical procedure used for analyzing declining production rates and forecasting future performance of oil and gas wells. Effectivewell method for matching and predicting oil. Decline curve analysis is a long established tool for developing future outlooks for oil production from an individual well or an entire oilfield.
Decline curve analysis is a means of predicting future oil well or gas well production based on past production history. Decline curve analysis is not a curvefitting exercise, and it should not be limited to a single ratetime graph of each well in isolation, much less just any ratetime graph created by the sloppy defaults of most graphing programs. However, existing studies on the viability of coupling co2eor with ccs have generally placed more focus on either the. An ideal decline curve for shale wells would be able to forecast linear flow followed by boundarydominated flow. Decline curve analysis is an exercise in seeing, understanding and predicting the reservoir and operational dynamics. Fetkovich 2 developed type curve, marhaendrajana and blasingame 5 extended type curve method to a multiwell system, and li and horn 3 verified. Analysis of production decline curves digital edition.
Lee and wattenbarger 1996 pointed out that the fetkovich method can be extended to infiniteacting aquifers by requiring that the ratio of water influx rate to pressure drop is approximately constant throughout the productive life of the reservoir. Phdwin is a fullfeatured economic and decline curve analysis program. Oil and gas production rates decline as a function of time. Because his method was rapid and easily applied, it was used extensively by ramsay in his evaluation of some 200 wells to determine the distribution of the decline curve exponent b. Dca parameters are easily input to fit your data and forecast production on the fly. These work indicate that the double porosity model predicts an initial high flowrate followed by p sudden rate decline and a period of constant 1. Production decline curve analysis is a traditional means of identifying well production problems and predicting well performance and life based on measured oil well production. 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. Fetkovich decline curve analysis excel calculations. Case study of a lowpermeability volatile oil field using. View notes fetkovichcourseoutline from petroleum 2 at petronas technology university. Production declinecurve analyses are the most widely used tool in the industry for oil and gas reservoir production analyses.
Arps type curves could only be used to analyze the data in the period of boundarydominated flow. A practical systematic introduction to each method helps the reservoir. 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. This study investigates the applicability of the widely accepted fetkovich type curves to low permeability gascondensate. However, dca methods can neither match nor predict the fluctuating oil production during the early period when applied to entire reservoirs. Most modern dca type curve techniques, which make it possible to determine reservoir and well productivity parameters such as permeability and skin, were originally developed for the analysis of singlephase flow. Decline curve analysis for twophase flow in tight gas. Basic concepts in decline curve analysis by mike fetkovich table of. Fetkovich calculated the productivity index from darcys equation for bounded aquifers. Type curve interpretation aids t cqq q t t c qdt qq q t 0 1 actual rate decline actual time material balance time. Decline curve analysis the characteristic production curves were derived by decline curve analysis. The fetkovich curve in topaze however, serves as a. This web application will take advantage of over 11 years of java development experience.
Production decline data from different types of waterdrive reservoirs were analyzed as examples of using the new decline analysis model. Modified fetkovich type curve which includes transient linear b 2 and. The fetkovich plot displays the rate and cumulative volume data against the elapsed time on a loglog scale. Robert frosts poem the road not taken concludes with the lines. This excel spreadsheet plots fetkovich decline curves for gas wells. Decline curve analysis free decline curve analysis. Fetkovichs decline curve dimensionless variables are defined as below12. Traditional decline generates a forecast of future production rates based on the equations defined by arps. Spe spe 14237 case study of a lowpermeability volatile oil field using individualwell advanced decline curve analysis by m. Fetkovich dca decline curve analysis course youtube.
This study compares four recently developed decline curve methods and the traditional arps or fetkovich approach. If not, the matching point of r ed will be multiple. An advantage is that less detailed data are required. Raghavan and ohaeri 19, and sageev zo also examined the rate dedine behavior of naturally fractured reservoirs. Get free shipping on advanced production decline analysis and application by hedong sun, from. Fetkovich introduced the idea of loglog type curve analysis to. This popular course explores reservoir engineering in relation to decline curves and the types of decline curves used and how they are applied throughout the industry. Read advanced production decline analysis and application online.
He extended the original work of arps holditch and madani 2010 highlighted that worldwide gas resources from conventional reservoirs are diminishing with unconventional reservoirs playing more important roles in sustaining production to. Production forecasting decline curve analysis petrowiki. A decline curve analysis model based on fluid flow. Phdwin offers evaluators a tool that combines an intuitive interface with. This book will serve as an authoritative reference on modern production declinecurve analyses, including details of some recent advances in the technology. The decline curve analysis template for tibco spotfire allows you to quickly plot oil forecast curves on top of your actual production, using the arps hyperbolic equation. With inputs for multiple scenarios, running sensitivities on the dca inputs is fast and easy.
Summary decline curve analysis has been proposed as an efficient approach for estimating reservoir and well parameters especially in unconventional gas reservoirs where the use of conventional pressuretransient analysis is often technically and economically challenging. 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 commonly found in. Pdf a new decline curve analysis method applied to the. A method for estimating reserves and predicting production in oil reservoirs and oil fields.
Decline curve analysis dca is a method to fit observed production rates of individual wells, group of wells, or reservoirs by a mathematical function in order to predict the performance of the future production by extrapolating the fitted decline function. Advanced production decline analysis and application by. Fetkovichcourseoutline basic concepts in decline curve. Fetkovich 1980 proposed a widely accepted decline curve analysis method using a set of type curves. He suggested that e xperimental production rate data could be overlaid on a graph and matched to a series of type curves. A decline curve analysis dialog was included to allow the user to predict the economic limit for a specific lease, field, operator and county. Production decline curves of tight oil wells in eagle ford. Production decline curve analysis the road not taken. 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.
This methodology has been extensively used on conventional oil and gas wells for over a century to describe and predict production decline rate and eur. Fetkovich recognized that decline curve analysis was only applicable during the depletion period ie. In recent years, production decline curve analysis has become the most widely used tool in the industry for oil and gas reservoir production analysis. The multiplicity of fetkovicharps decline curve analysis. If your connection is slower, you will want to download the files separately. Summary traditionally, decline curve analysis dca has been used by reservoir engineers to estimate hydrocarboninplace and expected ultimate recovery.
Depletion rate also can be connected to decline curves. The production decline analysis techniques of arps and fetkovich are limited in that they do not account for variations in bottomhole flowing pressure in the transient regime, and only account for such variations empirically during boundarydominated flow by means of the empirical depletion stems. Depletion and decline curve analysis in crude oil production. Decline curve analysis has been called the most commonly used and misused technique for forecasting future production and remaining reserves. The missing link identification of reservoir compartmentalization through downhole fluid analysis. Buy advanced production decline analysis and application. Decline curve analysis is the most currently method used available and sufficient 1. Fetkovich introduced the idea of applying loglog type curve analysis to singlewell analysis for both transient flow period and boundarydominated flow period. The fetkovich decline curve analysis method was extended for application to vapordominated geothermal reservoirs to estimate the permeabilitythickness product. Read unlimited books and audiobooks on the web, ipad, iphone and android.
Fetkovich 1968 improved on earlier work by arps in predicting the declining production rate of oil and gas wells. The production rate is then extrapolated into the future with the assistance of the curves. A new direction for decline curve analysis was given by slider 2 with his development of an overlay method to analyze ratetime data. Decline curve analysis predicts the decline in production rates of gas and oil wells as they age. Using vogels method, draw the ipr curve, and estimate the wells potential. However, most curve analysis is done by computer today. Decline curve analysis dca is a traditional method for production prediction, which is still being used because it works in many cases and it is relatively simple to apply. 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. The original fetkovich type curves were developed for constant or only slightly changing downhole pressures and were used to estimate the drainage area and the decline parameter. Decline curve analysis for estimating eurs and ooips. Reservoir evaluation decline curve analysis esanda.
Thus, a major advantage of this decline trend analysis is inclusion of all production and operating conditions that would influence the performance of the well. Scribd is the worlds largest social reading and publishing site. A curve fit of past production performance is done using certain standard curves. 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. Types of decline analysis in production forecasting petrowiki. Brons 1963 and fetkovitch 1983 applied constant pressure solution to diffusivity equation and demonstrated that. Advanced production decline analysis and application starts from the basic concept of advanced production decline analysis, and thoroughly discusses several. Fetkovich dca decline curve analysis course whitson academy. Computerassisted approach, elsevier science and technology books, 2007, pages. Apr 17, 2018 environmental concerns about carbon emissions coupled with the oil industrys need to secure additional co2 for enhanced oil recovery co2eor projects have sparked interest in the potential that co2eor may have in jumpstarting carbon capture and sequestration ccs. This study investigates the applicability of the widely accepted fetkovich type curves to low. Conversely, predictions from the decline history assumes that no significant changes in these factors will take place. Prediction of reservoir performance applying decline curve.
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