Interference well testingvariable fluid flow rate journal. Producing well measure pressure in another shutin well away from the producer communication test gas well test back pressure, isochronal test, modified. 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. Pdf examples of pitfalls in well test analysis semantic. More than 50 examples are included to illustrate analysis techniques presented, as well as to emphasize practical problems that arise in well test analysis. Thus the mobility formation permeabilityviscosity ratio of the injected water should be very close to that of the reservoir water. Advances in well test analysis can be used for most well test analysis situations without requiring other material. Other readers will always be interested in your opinion of the books youve read. Advances in practical welltest analysis semantic scholar. Analysis of pressure buildup test, pressure drawdown test. Well test analysis free download as powerpoint presentation. Illustration of type curve matching for an interference test after earlougher4.
The methodologies described in the course, which have become the standard of the industry, will present the systematic way of interpreting well tests. Earlougher rc,1977 advances in well test analysis, spe dallas tx 6. Conventional analysis of pressure drawdownbuildup data c. 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. Aspects of geothermal well test analysis in fractured reservoirs.
Introduction the 1980s produced important advances in welltest analysis. 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. Semilog data plot for the pressure drawdown test after earlougher 1977. Analysis of shorttime transient test data by typecurve matching robert c. Conventional well test analysis has been developed pri. Analysis of testing data for oil, gas, and multiphase. Shutin the well decreasing the bottom hole pressure. Basic concepts in well testing for reservoir description patrick corbett hamidreza hamdi. Pressure transient testing syllabus and administrative procedures spring 2010. 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. Pta pressure transient test analysis for an unfractured oil well in an infiniteacting homogenous reservoir. Hydrodynamic well tests, also called formation tests, have a basic significance. Using these techniques, we can deconvolve pressure and rate data from drawdown and buildup tests dominated by wellbore storage.
The analytic model used by gringartento describe a vertical well in an infinite homogeneous reservoir is discussed by f. This course will enable participants to understand the fundamental concepts of well test analysis. The diffusivity equation used to generate the well test analysis solutions is linear. 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. An account of responses in wells producing fluids hydrocarbons, water, steam from subterranean porous formations. In 1977 he authored an spe monograph, advances in well test analysis, that has sold 40,000 copies and is. It is calculated using an analytic model and expressed in dimensionless variables. Figure 336 schematically shows rate and pressure behavior for an ideal pressure buildup test. Well test analysis, volume 3 1st edition the use of advanced interpretation models. The objective is to provide an easy to read introduction to classical well test theory. 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. Radius of investigation for reserve estimation from. Well test analysis for naturally fractured reservoirs. A minimum of 6 problems are planned, where the topical coverage will include.
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 large number of new and sometimes competitive methods, how ever, also produced confusion. Most well tests consist of changing the rate, and observing the change in pressure caused by this change in rate. Well test analysis is a critical tool to understand well and reservoir performance. Earlougher, 1977 and the reader who is not familiar with this subject is. 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.
Welltest interpretation the aim of welltest interpretation is t o obtain from. Pressure buildup testing requires shutting in a producing well. This fifth book in the schlumberger testing services set summarizes the state of the art in well test interpretation. 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 aim of welltest interpretation is to obtain from the analysis of pressure. Advances in well test analysis spe series earlougher. 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. 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. Analysis of shorttime transient test data by typecurve matching. Recently a number of automated welltest analysis systems have been developed. Jr advances in well test analysis, monograph series, vol 5, spe. They allow to determine the state of reservoirs and wells and help to optimize production and recovery. 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.
Several numerical experiments comparing the response of a fractured geothermal reservoir with that of a uniform reservoir are reported. The transient test analysis for an injection well with a nonunit mobility ratio is complex and the reservoir should be considered as a. 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. Well test analysis for naturally fracrmred reservoirs giwanni da prat intevep, s. Also, cold water injection into a twophase reservoir is considered. 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. Introduction the 1980s produced important advances in well test analysis.
The main ob jective of this paper is to consider the current. Well test analysis, prentice hall petroleum engineering series. To understand the fundamental principles of well testing 2. Explicit deconvolution of well test data dominated by. Earlougher, jr advances in well test analysis, spe monograph vol. Search for library items search for lists search for contacts search for a library. 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. 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.
The reader is expected to understand basic concepts of flow in porous media. Geologists, drilling engineers, production engineers and reservoir engineers with 15 years experience. Some of these methods have the advantage of deconvolving the pressure data without rate measurement. This paper addresses some methods for interpretation of oil and gas well test data distorted by wellbore storage effects. 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. More than 50 examples are included to illustrate analysis techniques presented, as well as to emphasize practical problems that arise in welltest analysis. Analysis of shorttime transient test data by typecurve. Test analysis method we recommend using this typecurve matching tech nique only if conventional transient test analysis can not be used.
Radius of investigation for reserve estimation from pressure. Advances in well test analysis can be used for most welltest analysis situations without requiring other material. Pta pressure transient test analysis for hydraulically fractured gas wells in an infiniteacting homogenous reservoir. It is possible to add several pressure responses, and therefore to describe the well behavior after any rate change. Well test interpretation the aim of well test interpretation is t o obtain from.
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. Slug tests shall be conducted on relatively another method is to introduce a solid undisturbed wells. 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. 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. Aspects of geothermal well test analysis in fractured. For a buildup after a single drawdown period at rate q during t p. Well test interpretation depends on mathematical models. Pressure drop in a production well inside a finite reservoir. Basic concepts in well testing for reservoir description. Introduction principles of transient test analysis pressure.
To perform a well test successfully one must be able to measure the time, the rate, the pressure, and control the rate. The well test which we will use in this program is the. Formation tests can be carried out in an uncased borehole this is a drillsteam test as well as in a completed well. 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. 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. 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. Introduction occasionally, insufficient transient test data are avail.
To be able to interpret the results of well test analysis 4. Well test analysis for wells produced at a constant. 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. Petroleum engineers face the daily challenges of designing and testing wells. Advances in well test analysis spe series earlougher robert c. Pressure transient testing syllabus and administrative. Advances in well test analysis spe series earlougher robert. It is rather easy to measure the length and diameter of a pipe and compute its. An example of this type of test is a singlepoint deliverability test in a gas well see production testing. In a pressure buildup test, one should stabilize the rate in the tested well for several days, that is, maintain the rate approximately constant. Pdf pressure and temperature drawdown well testing. The evolution of the state of the art in well test analysis alain c. Well test analysis for wells produced at a constant pressure. By substitution in the above equations, reservoir properties may be calculated.
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