Pdf the use of transient well testing for determining reservoir parameters and productivity of horizontal wells has become common because. Basic relationships of well log interpretation introduction this chapter provides a general introduction to well logging principles and methods that will be used throughout the book. This well book summarizes the state of the art in well test interpretation. 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. They are also often present in decaying organic matter, topsoil and in surface waters. Successful mdtrft testing, to a large degree, depends on the. Everything you always wanted to know about well test analysis but.
The longer the flow period, the more information you can extract from a. Well test manager user manual for roc800series 2 introduction revised aug16. What is well test analysis wta it is the extraction of information from pressure and rate data measured in a producing well. Well water testing and understanding the results april 2011 college of agriculture and life sciences az1486f as a private well owner, you are responsible for making sure your well water is safe to drink. The teaching textbook for the course of lectures discusses the well tests analysis. Applying pressure buildup test interpretation techniques to borehole heat exchanger testing, greater accuracy could be achieved since ground.
The results of interpretation of well testing in horizontal well show that the developed models and algorithms of adaptive identification and interpretation allow. The formation is isolated behind cemented casing and perforated at the formation depth or, in openhole, the formation is straddled by a pair of packers that isolate the formation. Regular water testing is essential to keep your drinking water clean and your well operating at peak performance. A short video to present well test analysis, also known as pressure transient analysis, and why we test oil and gas wells from exploration to production. Understanding diagnostic plots for welltest interpretation. Succeeding chapters 2 through 6 introduce the reader to specific log types. Numerical well testing interpretation model and applications. Bayesian deconvolution of oil well test data using. A ldi training course modern well test analysis reservoir analysis in the computer age dr. The interpretation software packages have been used for the preparation of the color figures. The dataplot will first help you with a qualitative interpretation, giving some indication on skin. Match model parameters to data by regression steps 24 are well understood. With no need to lose production, reservoir size can be determined.
Well test interpretation depends on mathematical models. Used in the exploration and discovery phase of a field, they are performed to determine the quality of a well or to permit estimation of producing rates at different producing pressures. There is a lot of information present in a pressure transient test, and it is the reservoir engineers job to correctly interpret that information in order to make the proper decisions regarding the production of the well being tested. Well test and pta for reservoir characterization of key properties. Well test analysis and interpretation techniques are problematic since there is a variety of alternative methods. Although the epa cannot force private well owners to comply with the epa guidelines, the agencys maximum contaminant levels can serve as a. A well testing model is established based on rheology experiments and by considering shear, diffusion, convection, inaccessible pore volume ipv, permeability. Well test analysis for wells produced at a constant pressure.
The owner of a private well is responsible for testing the water, interpreting the results and making necessary changes to the system. The well test which we will use in this program is the. No part of this book may be reproduced, stored in a retrieval system, or transcribed in any form. An integrated approach to well test interpretation is emphasized throughout the course. Well test in most well tests, a limited amount of fluid is allowed to flow from the formation being tested. Classical well test interpretation depends on simplified analytical. Deconvolution is a technique for welltest interpretation.
Well test analysis, volume 3 1st edition the use of advanced interpretation models. The dst or drill stem test used in both oil and gas wells, in cased or uncased wells. Pdf on jan 1, 2014, chikwendu ubani and others published automated well test analysis i find, read and cite all the research you need. This course will enable participants to understand the fundamental concepts of well test analysis. Static level static level is the level of water in a well when no water is being taken from the well by pumps it is usually expressed as the distance in feet or.
Wells are aligned to the test separator through a series of valves which can be operated manually or through automation. Spe member price usd 110 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 decisions. The dataplot will first help you with a qualitative interpretation, giving some indication on skin, permeabilitythickness and pressure support over time. All these examples show that diagnostic plots have some limitations but they are extremely helpful because they provide a unified approach for well test interpretation and are applicable in a wide. Uncertainty involved in estimating reservoir parameters from a well test interpretation originates from the fact that different reservoir models may appear to match the pressure data equally well. It allows the reconstruction of a constant rate drawdown response for all production and shutin periods combined gringarten, 2008. Well test interpretation this course is intended for engineers and specialist who want to learn the reasons for well testing, and the. In welltest analysis, a diagnostic plot is a scatter plot of both drawdown and its logarithmic derivative versus time. Well test manager program user manual for roc800series. Well test analysis well test support and elearning. A successful well test analysis requires the selection of the most appropriate model to represent the reservoir behavior. Welltest analysis and interpretation techniques are problematic since there is a variety of alternative methods.
Jan 14, 2014 a short video to present well test analysis, also known as pressure transient analysis, and why we test oil and gas wells from exploration to production. Very, very common test so learn about them used to determine formation permeability boundary conditions. Hopefully, this book will give the reader a useful introduction. Most well tests consist of changing the rate, and observing the change in pressure caused by this change in rate. Andy, schlumberger of canada, 8016th avenue sw, calgary, alberta, t2p 3w2 abstract. Hopefully, this book will give the reader a useful introduction to a fascinating subject and stimulate further studies. 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 decisions. Reservoir interpretation, supercharging evaluation, and data processing burnie, stephen w. Bayesian deconvolution of oil well test data using gaussian. Basic concepts in well testing for reservoir description patrick corbett hamidreza hamdi. Well test analysis for wells produced at a constant. Deconvolution should be the driving tool in well test interpretation. This course stresses practical application of well test theory to design and interpret pressure transient tests. A drawdown test is one in which the rate is held approximately constant while the well pressure is measured.
Horner analysis, an example of well test interpretation. Well test interpretation wti is much more than pressure transient analysis pta. The conventional and modern well test interpretation methods are an important tool in the petroleum engineers toolkit. Deconvolution helps to refine initial pressure, provide a better understanding of the test and investigate further away in the reservoir. Various types of surface pressure tests usually for gas wells. Once fully familiar with the tools, well test analysis can be performed to recover the well and reservoir information from the data.
Conventional well test analysis has been developed pri marily for constant flow. One of the most useful plots that one can make from a pressure transient test is the pressure derivative plot. It is rather easy to measure the length and diameter of a pipe and compute its. Ehligeconomides, peter hegeman schlumberger oilfield services houston sven vik. Reservoir boundary, well test interpretation, drill stem tests, stimulation. This data is also used to calculate bottomhole pressures 3. The new interpretation methods, using the derivative of the pressure, magnify. From the authors of pressure transient testing and well testing, spivey and lee introduce the readers of applied well test interpretation to the fundamentals of this critical piece of decisionmaking by focusing on the most basic well testing scenario.
The text discusses how different log types measure various. The objective is to provide an easy to read introduction to classical well test theory. The well test manager program is used to determine liquid and gas quantities from a series of wells using a test separator. If the well is producing from a closed drainage area or where the flank is subject t o water drive, this will be reflected in a pseudosteadystate behavior or a constant pressure in a plot of pressure versus time as recorded by the gauge. He is a recognized expert in well test analysis and received the society of petroleum engineers spe formation evaluation award for 2001 and the 2003 spe john franklin carll award. Ehligeconomides, peter hegeman schlumberger oilfield services houston sven vik saga petroleum a. It emphasizes the need for a controlled downhole environment and highperformance gauges both of which have made well testing a powerful reservoir description tool. Pdf well testing and interpretation for horizontal wells. This work presents numerical well testing interpretation model and analysis techniques to evaluate formation by using pressure transient data acquired with logging tools in crossflow doublelayer reservoirs by polymer flooding. Streamline numerical well test interpretation 1st edition.
An introduction to well drawdown several key terms associated with well drawdown are listed below. Well test objectives exploration well on initial well, confirm hc existence, predict a first production forecast dst. Well test design reservoir characterization schlumberger. Interpret well test to determine reservoir properties analyze transient well data to diagnose well condition design well tests for maximum efficiency and success. It is better to measure something than to calculate it. From the authors of pressure transient testing and well testing. Well test interpretation schlumberger 2002 all rights reserved. The methodologies described in the course, which have become the standard of the industry, will present the systematic way of interpreting well tests. Understanding diagnostic plots for well test interpretation article pdf available in hydrogeology journal 173. Private drinking water wells are not required to be tested on a routine basis like public water supplies. Roland horne has designed this course to show you how to. Well test interpretation the aim of well test interpretation is t o obtain from. To understand the fundamental principles of well testing 2.
Pdf understanding diagnostic plots for welltest interpretation. To be able to interpret the results of well test analysis 4. Decisions, whether to start possible engineering projects or not, are based on economic analysis. To perform a well test successfully one must be able to measure the time, the rate, the pressure, and control the rate. In well test analysis, a diagnostic plot is a scatter plot of both drawdown and its logarithmic derivative versus time. Pdf well test interpretation tirso alejandro academia. Geologists, drilling engineers, production engineers and reservoir engineers with 15 years experience. The reader is expected to understand basic concepts of flow in porous media. Deconvolution is a technique for well test interpretation.
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