Analysis of testing data for oil, gas, and multiphase. Most well tests consist of changing the rate, and observing the change in pressure caused by this change in rate. Apartado 76343 caracas venezuela 1070 abstract pressure transient solutions for constant rate production and transient rate analysis for con stant pressure production are presented for a naturally fractured reservoir. They allow to determine the state of reservoirs and wells and help to optimize production and recovery. Other readers will always be interested in your opinion of the books youve read. Well test analysis, prentice hall petroleum engineering series. Basic concepts in well testing for reservoir description patrick corbett hamidreza hamdi. Pressure transient testing syllabus and administrative. Radius of investigation for reserve estimation from pressure. Well test analysis for naturally fracrmred reservoirs giwanni da prat intevep, s. The well test analysis methods prevailing during the 1950s and 1960s are described in spe monograph 1 by matthews and russell 1967 and spe monograph 5 by earlougher 1977. Pressure drop in a production well inside a finite reservoir. Analysis of shorttime transient test data by typecurve matching.
An example of this type of test is a singlepoint deliverability test in a gas well see production testing. Conventional analysis of pressure drawdownbuildup data c. Well test analysis free download as powerpoint presentation. The aim of welltest interpretation is to obtain from the analysis of pressure. Also, cold water injection into a twophase reservoir is considered. Geologists, drilling engineers, production engineers and reservoir engineers with 15 years experience.
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. Semilog data plot for the pressure drawdown test after earlougher 1977. Advances in practical welltest analysis semantic scholar. Earlougher, 1977 and the reader who is not familiar with this subject is. Figure 336 schematically shows rate and pressure behavior for an ideal pressure buildup test. Pta pressure transient test analysis for an unfractured oil well in an infiniteacting homogenous reservoir. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. 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. More than 50 examples are included to illustrate analysis techniques presented, as well as to emphasize practical problems that arise in well test analysis. Explicit deconvolution of well test data dominated by. In 1977 he authored an spe monograph, advances in well test analysis, that has sold 40,000 copies and is still used as a textbook in several universities.
A new approach to conventional welltest analysis by earlougher and kersch14 was used to prepare type curves for the slug test which include the skin effect. Petroleum engineers face the daily challenges of designing and testing wells. Pdf pressure and temperature drawdown well testing. If a test is conducted on cylinder of known volume to displace and a well that has recently been pumped for raise the water level, allow the water level to water sampling purposes, the measured water. The transient test analysis for an injection well with a nonunit mobility ratio is complex and the reservoir should be considered as a. Aspects of geothermal well test analysis in fractured. 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 to gas reservoirs, application to multiphase reservoirs, special tests, practical aspects of well test. Test in wells 1967 robert earlougher, advances in well test analysis 1977 canadian energy resources conservation board, theory and practice of the testing of gas wells 1975 roland horn, modern well test analysis 1995 selected papers from spe journals and symposium proceedings. Woodbury, year1983 recent developments in the modeling and prediction of pressure transient tests for various reservoir and flow conditions have indicated the similarities in. The reference explains the theories forming the basis of procedures for estimating the properties of underground reservoirs, and the underlying assumptions of well test analysis. Several numerical experiments comparing the response of a fractured geothermal reservoir with that of a uniform reservoir are reported. It is calculated using an analytic model and expressed in dimensionless variables. 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.
Introduction the 1980s produced important advances in well test analysis. Bob was a recognized expert in well test analysis and authored many important papers on that subject and on reservoir simulation and enhanced oil recovery. More than 50 examples are included to illustrate analysis techniques presented, as well as to emphasize practical problems that arise in welltest analysis. Advances in well test analysis can be used for most well test analysis situations without requiring other material.
Well test interpretation depends on mathematical models. The well test which we will use in this program is the. Search for library items search for lists search for contacts search for a library. To understand the fundamental principles of well testing 2. The most common and the simplest analysis techniques require that the well produce at a constant rate, either from startup or long enough to establish a stabilized pressure distribution, before shutin. Pressure transient testing syllabus and administrative procedures spring 2010. This paper addresses some methods for interpretation of oil and gas well test data distorted by wellbore storage effects. Earlougher rc,1977 advances in well test analysis, spe dallas tx 6. Pressure buildup testing requires shutting in a producing well. This is the superposition principle van everdingen and hurst, 1949. An account of responses in wells producing fluids hydrocarbons, water, steam from subterranean porous formations. For a buildup after a single drawdown period at rate q during t p.
Although the rawlins and shellhardt equation is not theoretically rigorous, it is still widely used in deliverability analysis and has worked well over the years, especially when the test rates approach the aof potential of the well and the extrapolation from test rates to aof is minimal. Basic concepts in well testing for reservoir description. By substitution in the above equations, reservoir properties may be calculated. This fifth book in the schlumberger testing services set summarizes the state of the art in well test interpretation. Interference well testingvariable fluid flow rate journal. Introduction principles of transient test analysis pressure. Advances in well test analysis can be used for most welltest analysis situations without requiring other material. The reader is expected to understand basic concepts of flow in porous media. A minimum of 6 problems are planned, where the topical coverage will include. Formation tests can be carried out in an uncased borehole this is a drillsteam test as well as in a completed well. Hydrodynamic well tests, also called formation tests, have a basic significance. 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. Welltest interpretation the aim of welltest interpretation is t o obtain from. Using these techniques, we can deconvolve pressure and rate data from drawdown and buildup tests dominated by wellbore storage.
Analysis of shorttime transient test data by typecurve. In a pressure buildup test, one should stabilize the rate in the tested well for several days, that is, maintain the rate approximately constant. Well test analysis for naturally fractured reservoirs. Some of these methods have the advantage of deconvolving the pressure data without rate measurement. Test analysis method we recommend using this typecurve matching tech nique only if conventional transient test analysis can not be used.
Nov 16, 2018 the end of the straightline era of well test analysis. Jr advances in well test analysis, monograph series, vol 5, spe. In 1977 he authored an spe monograph, advances in well test analysis, that has sold 40,000 copies and is. The diffusivity equation used to generate the well test analysis solutions is linear.
Shutin the well decreasing the bottom hole pressure. Slug tests shall be conducted on relatively another method is to introduce a solid undisturbed wells. It is rather easy to measure the length and diameter of a pipe and compute its. Analysis of pressure buildup test, pressure drawdown test. Well test interpretation the aim of well test interpretation is t o obtain from. Analysis of shorttime transient test data by typecurve matching robert c. Well test analysis, volume 3 1st edition the use of advanced interpretation models.
A constant rate drawdown test followed by a buildup test is investigated for both an initially twophase reservoir and an initially liquid reservoir which flashes during the test. The transient test analysis for an injection well with a nonunit mobility ratio is complex and the reservoir should be considered as a composite system earlougher 1977. Pdf examples of pitfalls in well test analysis semantic. Producing well measure pressure in another shutin well away from the producer communication test gas well test back pressure, isochronal test, modified. This course will enable participants to understand the fundamental concepts of well test analysis. Radius of investigation for reserve estimation from. The large number of new and sometimes competitive methods, how ever, also produced confusion. Aspects of geothermal well test analysis in fractured reservoirs. Earlougher, jr advances in well test analysis, spe monograph vol. Introduction occasionally, insufficient transient test data are avail. The objective is to provide an easy to read introduction to classical well test theory. The evolution of the state of the art in well test analysis alain c.
Advances in well test analysis spe series earlougher. It is possible to add several pressure responses, and therefore to describe the well behavior after any rate change. Thus the mobility formation permeabilityviscosity ratio of the injected water should be very close to that of the reservoir water. Pta pressure transient test analysis for hydraulically fractured gas wells in an infiniteacting homogenous reservoir. The main ob jective of this paper is to consider the current. Conventional well test analysis has been developed pri.
Well test analysis for wells produced at a constant. To be able to interpret the results of well test analysis 4. Advances in well test analysis spe series earlougher robert c. A new approach to conventional well test analysis by earlougher and kersch14 was used to prepare type curves for the slug test which include the skin effect. Recently a number of automated welltest analysis systems have been developed. Introduction the 1980s produced important advances in welltest analysis. Introduction principles of transient test analysis pressure drawdown testing multiplerate testing pressure buildup testing estimating average reservoir pressure injection wall testing drillstem testing multiple well testing. 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 analysis is a critical tool to understand well and reservoir performance. Well test analysis for wells produced at a constant pressure. Well test analysis of twolayered oil reservoir in commingled flow system abdul majeed msc petroleum engineering heriotwatt univsirty uk assistant professor ned university engineering and technology karachi department of petroleum engineering abstract this paper presents multilayer testing and analysis techniques to obtain. Illustration of type curve matching for an interference test after earlougher4. Introduction the challenge in estimating reserves from pressure transient well test data very often arises in oil and gas explorations as well as in other oil industry applications. Introduction principles of transient test analysis pressure drawdown testing multiplerate testing pressure buildup testing estimating average reservoir pressure injection wall testing drillstem testing multiplewell testing.
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