H 0 is the difference between the pre test level and the highest level immediately after insertion of the slug, h is the difference between the pre test level and the level at some time t after the insertion of the slug. Since the type curve as facilitated the interpretation and uniqueness of match. Well test analysis is a critical tool to understand well and reservoir performance. Spe distinguished lecturer program primary funding is provided by. Deconvolution and interpretation of well test data masked. During a well test, a transient pressure response is created by. Use of the pressure derivative for diagnosing pressuretransient behavior c. The user enters the well test data and appropriate reservoir and production parameters. A well is flown at a constant rate and the pressure change decline is monitored derived parameters. Use of the pressure derivative for diagnosing pressure. Well test analysis and interpretation techniques are problematic since there is a variety of alternative methods. Deconvolution is a technique for well test interpretation. Pressure transient analysis flow, q, pressure, p, and time, t p time, t qt rate 0 p i. Production testing development well on production well, satisfy need for well treatment.
Wan renpu, in advanced well completion engineering third edition, 2011. This book on well test analysis, and the use of advanced interpretation models is volume 3 in the series handbook of pet. It is possible to add several pressure responses, and therefore to describe the well behavior after any rate change. Unlike any other surveillance activity, a pressure transient test provides information about the well and reservoir performance permeabilitythickness kh and skin s, hydraulic connectivity over large volume and average reservoir pressure. So this tool was designed for free download documents from the internet. Geologists, drilling engineers, production engineers and reservoir engineers with 15 years experience. The analysis of this type of data in reservoir characterization by well test analysis is well known as inverse problem. This book on well test analysis, and the use of advanced interpretation models is volume 3 in the series handbook of petroleum exploration and production. Well test analysis the use of advanced interpretation models details after a presentation of the various interpretation techniques proposed by all well test interpretation computer programs straight line methods, pressure curve analysis, pressure derivative method, the advantages and limitations of the different approaches are discussed. This course will enable participants to understand the fundamental concepts of well test analysis. Examples of flow regimes that one may discern with derivative analysis include infiniteacting radial flow, wellbore storage, linear flow, bilinear flow, interporosity flow and boundaries.
It allows the reconstruction of a constant rate drawdown response for all production and shutin periods combined gringarten, 2008. For a buildup after a single drawdown period at rate q during t p. A flowing well is shut in and the pressure change buildup is monitored constant rate assumption during a test is easily achieved zero production. This tec hnique is tailored to improve bo th the performance and accuracy of well te st.
Groundwater hydrologists use derivative analysis to identify important flow regimes encountered during a pumping test, detect aquifer boundaries and select. Derivative analysis is powerful diagnostic tool that enhances the interpretation of data from pumping tests. Principles of transient testing, analysis methods, wellbore con. To understand the fundamental principles of well testing 2. Derivative analysis is an invaluable tool for diagnosing of a number of distinct flow regimes.
Well testing and well hydraulics play a major role in applied hydrogeology. The data are captured during dedicated well test operations such as dsts or production tests or during routine operational shutins by permanent downhole gauges pdg. A numerical grid can be used for geometries beyond the scope of analytical models. Analysis of well tests in afyon omergecek geothermal field. Well test analysis ebook by dominique bourdet rakuten kobo. Introduction to pressure transient analysis fluid dynamics. Well test analysis is the main method of onsite fieldevaluation of well completion quality in oil and gas wells. H 0 is the difference between the pretest level and the highest level immediately after insertion of the slug, h is the difference between the pretest level and the level at some time t. A thesis in the requirements for the degree of master of.
Handbook of petroleum exploration and production, 3. To be able to interpret the results of well test analysis 4. The methodologies described in the course, which have become the standard of the industry, will present the systematic way of interpreting well tests. Most figures presented in this set of course notes are extracted from well test analysis. Features difficult to discern in drawdown data alone are often readily apparent through the application of the derivative procedure. Estimation of hydraulic conductivity using the slug test. The scope o f this work i s to present a new tech niquemethod for auto mating well test analysis.
Hydraulics of wells and well testing philippe renard university of neuchatel, neuch. M 1,2,3department of petroleum and gas engineering university of port harcourt, nigeria. Pdf understanding diagnostic plots for welltest interpretation. The use of advanced interpretation models volume 3 handbook of petroleum exploration and production volume 3. With todays powerful graphic and computing facilities, the characteristic features of the many different types of wells. In order to resolve these problems, from the early 1970s to the middle 1980s, a number of percolation mechanics and well test specialists, headed by ramey, agarwal, gringarten, and bourdet, successfully developed the modern well test analysis method whose core is the loglog type curve match method. While well hydraulics aims at modeling the groundwater behavior in response to a perturbation such as pumping in a well, well testing. The multirate test of af21 consists of a well test sequence 4 distinct step rate changes and one shutin period acquired over a 16hour test. Well test and pta for reservoir characterization of key. Well test pressure transients tim whittle bg group society of petroleum engineers distinguished lecturer program. Bourdet, handbook of petroleum exploration and production 3, elsevier science, 2002. Well testing and interpretation free in pdf format. The program compares the type curve to the smoothed well test data and derivate curve of the data. This is the superposition principle van everdingen and hurst, 1949.
Well test analysis can directly determine the degree of damage, using the value of skin factor s and various. Well test analysis by dominique bourdet overdrive rakuten. Unlike any other oil and gas surveillance activity, a pressure transient test provides information about well and reservoir performance permeabilitythickness kh and skin s, hydraulic connectivity over large volume and average reservoir pressure. Figure 2 presents the pressure and rate data for this well test sequence note that a single pressure buildup profile of about 4 hr is acquired at the end of the testing sequence. Principles of transient testing, analysis methods, wellbore conditions, effect of reservoir heterogeneities on well responses, effect of reservoir boundaries on well responses, multiple well testing, application. While standard welltest analysis used to be based on manual type curve matching or straightline analysis, the methodology is now mostly computerized for all the four above introduced steps. Read well test analysis the use of advanced interpretation models by dominique bourdet available from rakuten kobo. Deconvolution is a technique for welltest interpretation.
Handbook of petroleum exploration and production, 3 bourdet, dominique on. The analysis of this type of data in reservoir characterization by. Saphir offers a comprehensive builtin analytical catalog combining well, reservoir and boundary models, complemented by external models. The combined plot of log pressure change and log derivative of pressure change with respect to superposition time as a function of log elapsed time was first introduced by bourdet et al. The use of advanced interpretation models, elsevier. These works offer new solution methods to the longstanding deconvolution problem and make deconvolution a viable tool for well test and productiondata. The diffusivity equation used to generate the well test analysis solutions is linear. Introduction to pressure transient analysis free download as powerpoint presentation. Description of a well test dd i bu p p pt p pt p t. Understanding diagnostic plots for welltest interpretation article pdf available in hydrogeology journal 173. Well test analysisthe use of advanced interpr by siu. Hydraulics of wells and well testing philippe renard.
A thesis in the requirements for the degree of master of science. Well test analysis an overview sciencedirect topics. Bayesian deconvolution of oil well test data using. The well test data is then smoothed using numerical methods and the derivative curve subsequently calculated. A standard test refers to the simplest form of transient test which assumes the analysis is linear. An investigation of recent deconvolution methods for well. During a well test, a transient pressure response is created by a temporary change in production rate. Basic concepts in well testing for reservoir description. Understanding diagnostic plots for welltest interpretation. Estimate put and its derivative dpud ln t from the data 2. About us we believe everything in the internet must be free. Welltest analysis and interpretation techniques are problematic since there is a variety of alternative methods. Pressure transient data analysis of fractal reservoir with.
Bayesian deconvolution of oil well test data using gaussian. Well test analysis for wells produced at a constant pressure. The causes and degrees of formation damage can be evaluated. The use of advanced interpretation models volume 3 handbook of petroleum exploration and production volume 3 bourdet, dominique on. The multirate test of af21 consists of a welltest sequence 4 distinct step rate changes and one shutin period acquired over a 16hour test.
Well test analysis the use of advanced interpretation models. Well test objectives exploration well on initial well, confirm hc existence, predict a first production forecast dst. Figure 2 presents the pressure and rate data for this welltest sequence note that a single pressure buildup profile of about. Pressure transient analysis, or pta, is, in most cases, about analyzing high frequency, high resolution shutin data. Deconvolution and interpretation of well test data masked by wellbore storage in a build up test 1akintola a. When a well test contains a series of different flow rates, or a continuously varying flow rate, the. These works offer new solution methods to the longstanding deconvolution problem and make deconvolution a viable tool for welltest and productiondata. After a presentation of the various interpretation techniques proposed by all well test interpretation computer programs straight line methods, pressure curve analysis, pressure derivative method, the advantages and limitations of the different approaches are discussed.
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