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. Data gathered during the test period includes volumetric flow rate and pressure observed in the selected well. Dagans 1978 method is used in wells screened across the. Pdf well testing and analysis techniques for layered reservoirs. Basic concepts in well testing for reservoir description. An integrated approach to well test interpretation is emphasized throughout the course. Roland horne has designed this course to show you how to. A ldi training course modern well test analysis reservoir analysis in the computer age dr. Well test analysis for wells produced at a constant pressure.
Well test interpretation this well book summarizes the state of the art in well test interpretation. Not only are evergreen subjects, such as layered reservoirs, naturally fractured reservoirs, and wellbore effects, covered in depth, but newer developments, such as well testing for horizontal wells, are. Principles of transient testing, analysis methods, wellbore conditions, effect of reservoir. Note that an interpretation does not store characteristics of the material that is being tested. The selection of test method s depends primarily on the hydrogeology of the area being tested. Since the publication of spes last monograph on well testing, considerable advances in testing tools, computing technology, and theoretical development have continued to enhance the information that can be obtained from transient testing and change the methods of interpretation.
The methodologies described in the course, which have become the standard of the industry, will present the systematic way of interpreting well tests. Well test interpretation depends on mathematical models. Pdf well test interpretation tirso alejandro academia. You can follow the all important features of this book before downloading. Understanding diagnostic plots for well test interpretation article pdf available in hydrogeology journal 173. To overcome these difficulties, analysts developed other methods of analysis, and the era of type curves began. Gas well testing handbook deals exclusively with theory and practice of gas well testing, pressure transient analysis techniques, and analytical methods required to interpret well behavior in a given reservoir and evaluate reservoir quality, simulation efforts, and forecast producing capacity. Pumping test for groundwater aquifers analysis and evaluation ramallah. Springer and gelhar 1991 extended the method to include inertial effects.
Well workovers to resolve mechanical problems or changes in operating practices can enhance performance and increase recovery. This method employs a quasisteadystate model that ignores elastic storage in the aquifer. A well test is simply a period of time during which the production of the well is measured, either at the well head with portable well test equipment, or in a production facility. Some plant species and production systems may have much different requirements or tolerances.
The new interpretation methods, using the derivative of the pressure, magnify the characteristic features of the many different types of wells and reservoirs. There are various data interpretation methods one can use. This course stresses practical application of well test theory to design and interpret pressure transient tests. Well testing stages surging step drawdown test recovery test constant rate test recovery test q1 q2 q3 q4 q5 d r a w d o w n time. The scope is to define the quality of the formation fluid. Pdf well testing and interpretation for horizontal wells. The main objective of drilling a well is to test and evaluate the target formation. In this textbook, the most important methods of well tests and their evaluations are. Pressure drop in a production well inside a finite reservoir.
Useful as both a text and a reference, this volume will greatly help practicing engineers and technicians to interpret well testing. This fifth book in the schlumberger testing services set summarizes the state of the art in well test interpretation. Flow in porous media is a very complex phenomenon and. Oil well testing handbook is a valuable addition to any reservoir engineers library, containing the basics of well testing methods as well as all of the latest developments in the field. It emphasizes the need for a controlled downhole environment and highperformance gauges both of which have made well testing a powerful reservoir description tool. A highly practical edition, this book is written for graduate students, reservoirsimulation.
Testing for these drugs is done using the kirby bauer method at this time, since they are not yet available for testing using the broth microdilution method. Interpretation methods 45 introduction 47 chapter4 conventional interpretation methods 51 4. The well test which we will use in this program is the. This course will enable participants to understand the fundamental concepts of well test analysis. Chapter 1 numerical well testing interpretation theory and method. The interpretation of the test results is, in many cases, dependant on the intended use of the water.
Having a baseline method or methods for interpreting data will provide your analyst teams a structure and consistent foundation. The use of transient well testing for determining reservoir parameters and productivity of horizontal wells has become common because of the upsurge in horizontal drilling. The teaching textbook for the course of lectures discusses the well tests analysis. Since renneys 1 article in 1941, many articles dealing withreservoir engineering, pi, and well testing aspects of horizontal wells haveappeared in the literature. Well test analysis is a critical tool to understand well and reservoir performance. The usual method of investigating the reservoir is to conduct a well test and there are two methods which are available. Initially, horizontal well tests were analyzed with the conventional techniques designed for vertical wells. Information obtained from well testing well description for completion interval s, production potential pi, and skin reservoir description average permeability horizontal and vertical heterogeneities fractures, layering, change of prop. Focus is placed on computerized interpretation of complex systems. The interpretation of data is designed to help people make sense of numerical data that has been collected, analyzed and presented. Hopefully, this book will give the reader a useful introduction to a fascinating subject and stimulate further studies. Nowadays, many waterflood oil fields have entered the late development period, and current well test theory and interpretation methods can not satisfy the actual. The water analysis method requirement in the fsma produce safety rule don stoeckel, connie fisk, donna pahl, gretchen wall, kristin woods, and elizabeth bihn updated april 2019 the topic of water testing, including the sampling schedule and method used to enumerate e.
There are often no predefined measures or hypotheses. Introduction to testing services overview of the complete testing cycle well testing objectives well test interpretation permeability description of fluid flow in porous media pressure diffusion. Flowthrough bromide chamber probe discharge to waste data logger flowmeter tank for injection automatic. At present, well testing models and techniques in doublelayer reservoirs by water flooding become mature, and commercial software can be used for reservoir evaluation. The use of advanced interpretation models handbook of petroleum exploration and production dominique bourdet on.
These methods are, the nonequilibrium type curve method, the modified nonequilibrium straight line method, the stepdrawdown analysis developed by water survey staff members, and the analysis. Understanding diagnostic plots for welltest interpretation. Outcomes of a well test, for instance flow rate data and gas oil ratio data, may support the well allocation process for an ongoing production phase, while other data about the reservoir capabilities will support reservoir management. Gas condensaterelated topics well deliverability, well test interpretation. It cites the equations used to interpret results, while avoiding detailed mathematical discussions. Of particular importance is the concept of efficacy ratios. Thus, although it may be possible to establish well equipped central and even regional laboratories for water analysis, at the provincial and. Boundaries distance and shape pressure initial and average. The new multilayer testing techniques consists of a number of sequential flow tests with a production logging tool that simultaneously measures the wellbore. Technical guidance manual for ground water investigations. 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. The new interpretation methods, using the derivative of the pressure, magnify.
Secondarily, the method is selected based on the testing conditions specified by a particular method, such as the method of stressing or causing water level changes in the ground water zone being evaluated and. It places emphasis on the most suitable interpretation methods for each case dealt with. Well test interpretation, which is the process of obtaining information about a reservoir by analyzing the pressure transient response caused by a change in production rate, plays a very important part in making overall reservoirmanagement. An interpretation generally results in the generation of characteristics for the well, or well completion andor characteristics of the region within the radius of investigation of the well test. Well test interpretation introduction 1 from its modest beginnings as a rudimentary productivity test, well testing has progressed to become one of the most powerful tools for determining complex reservoir characteristics. In this document, we attempt to answer many of the frequently asked questions regarding antimicrobial susceptibility testing. The presence of pressure maintenance by an aquifer may make this method inappropriate to use. Interpret well test to determine reservoir properties analyze transient well data to diagnose well condition design well tests for maximum efficiency and success. Well testing and interpretation for horizontal wells. For each case examined, it describes the most suitable interpretation methods, such as traditional methods, type curves, computergenerated type curves, and interpretation using derivatives. An example of a well test interpretation procedure horner.
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