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