During a well test, a transient pressure response is created by a temporary change. Often referred to as dst, these tests are usually conducted with a downhole shutin tool that allows the well to be opened and closed at the bottom of the hole with a surfaceactuated valve. Successful mdtrft testing, to a large degree, depends on the quality of the reservoir and the condition of the wellbore. Geophysical well logging is a mature technology comprising many separate systems. Succeeding chapters 2 through 6 introduce the reader to specific log types. Pdf well testing and interpretation for horizontal wells. During a well test, a transient pressure response is created by. Geologybased well test design and interpretation services. Class exercises involving hand calculations and simple spreadsheet applications will reinforce the concepts illustrated by both synthetic data sets and real field examples. Shale cores from 1 to 3inches long are fitted into a modified hassler cell that has sensitive.
Pdf well testing and analysis techniques for layered reservoirs. A flowing well is shut in and the pressure change buildup is monitored constant rate assumption during a test is easily achieved zero production. Schlumberger tests 202021 practice tests free aptitude tests. Well test analysis is a critical tool to understand well and reservoir performance. Refine previous interpretation, pvt sampling, longer. Bayesian deconvolution of oil well test data using.
An integrated approach to well test interpretation is emphasized throughout the course. Pdf basic concepts in well testing for reservoir description. Well test design reservoir characterization schlumberger. 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. Pdf influence of petrophysics uncertainty on well test. Classification of individual mdtrft tests into a, b, c, and d four quality codes, identifies tests affected by supercharging and packer leakage, the main sources of erroneous pressure data. Shorttime well test data interpretation in the presence of skin effect and. This is followed by a flow period of 4 to 24 hours to establish stable flow to the surface, if possible, and followed by the final shutin or buildup test. Well test analysis in practice oil and gas reserves and evaluation i.
Schlumberger oilfield glossary credits schlumberger. System analysis part 1, well test interpretation for monophasic oil by analysis of pressure behavior by flopetrol johnston schlumberger modern well test analysis a computer aided approach by ronald n. Deconvolution is a technique for welltest interpretation. Over the past two decades, modern tools, such as mdt, rci, rdt, and frt, have emerged to become as one of the critical formation evaluation means in drilling projects with high costrisk and high reward environments. Petrel quantitative interpretation enables true integration of multidisciplinary seismic with well and geological data. Well test in most well tests, a limited amount of fluid is allowed to flow from the formation being tested. This helps them understand the consistency between geological details and production response. Prior knowledge of basic well testing operations and well testing interpretation is preferable. Schlumberger tests 202021 practice tests free aptitude. Well testing and interpretation for horizontal wells article pdf available in journal of petroleum technology 471. The pie welltest analysis program is a complete package for the manipulation and interpretation of pressure transient tests for oil and gas wells. The schlumberger diagrammatic and logical reasoning tests comprise of questions relating to sequences of shapes and patterns.
Mar 29, 2015 well test interpretation fundamentals of transient well test behavior 15 type curves the infiniteacting radial flow equation derived in the sidebar on page 12 can be written in terms of the wellbore storage coefficient c and skin factor s as follows after gringarten et al. Principle of well testing azmi mohdarshad department of petroleum engineering well test interpretation skm4323. Influence of petrophysics uncertainty on well test interpretation in west al qurna oil field, south iraq thesis pdf available may 2017 with 490 reads how we measure reads. The aim of this book is to study the technical reference for engineers and technicians in welltesting phase. Everything you always wanted to know about well test analysis but. Schlumberger cased hole log interpretation principlesapplications.
The types include postfracture tests, variable rate analysis, horizontal well testing, and multi well testing. Information from a four arm caliper and cmr log, allows the selection of testing points that are most likely to give valid. These are designed to test your logical reasoning as well analytical and problemsolving skills. Injection well transient testing and analysis are simple as long as the mobility ratio between the injected and insitu fluids is about unity and the radius of investigation is not beyond the water injected fluid bank. The text discusses how different log types measure various. It emphasizes the need for both a controlled downhole environment and highperformance gauges, which have made well testing a powerful reservoir description tool.
With no need to lose production, reservoir size can be determined. Deconvolution is a technique for well test interpretation. Ehligeconomides, peter hegeman schlumberger oilfield services houston sven vik. Society of professional well log analysts, houston chapter. It emphasizes the need for a controlled downhole environment and highperformance gauges both of which have. To understand this important discipline, well testing experts have developed definitions ranging from average reservoir pressure to dst and well interference testing. Euro 4,950 fundamentals of well testing operations location. It is well beyond scope of a short article like this to detail the science and the results of the many facets of. This ensures complete description of reservoir properties and extends conventional qualitative interpretation to a quantitative interpretation workflow in the same canvas. Rft essentials of pressure test interpretation schlumberger on. The most common test sequence consists of a short flow period, perhaps five or ten minutes, followed by a buildup period of about an hour that is used to determine initial reservoir pressure. P e is unitless, but since it is proportional to the photoelectric cross section per electron, it is sometimes quoted in barnselectron. A well is flown at a constant rate and the pressure change decline is monitored derived parameters. The ppt device monitors the increase in pore pressure in a shale when exposed to a drilling fluid over a period of time.
Well test knowledge international wtki, provides professional consulting services in well testing including analysis, completions and related areas of petroleum engineering. The book covers transient well test behavior, descriptive and reservoir well testing, gas well testing, and the application of simultaneously. This well book summarizes the state of the art in well test interpretation. It emphasizes the need for a controlled downhole environment and highperformance gauges both of which have made well testing a powerful. 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. A drawdown test is one in which the rate is held approximately constant while the well pressure is measured. The art of ancient log analysis, houston, texas, usa. Concert well testing live performance brings digital automation and communication to well testing by giving youin your office or wherever you designatethe same realtime information and interactive capabilities as the operations personnel and experts in the remote operations center. Figure 141 shows types of tests, limitations, and their uses.
This reference book, produced by schlumberger for oilfield technical professionals, illustrates stateoftheart technologies with field examples from well testing applications to test design, operations, and interpretation. It gives information on the types and properties of fluids in the formation, indicates the presence of hydrocarbons, and provides information on the pressures of the fluids within the formation. Peculiarities of the deconvolution problem in well test interpretation are in the following. A standard windows user interface for data manipulation and display of analysis plots. This course will enable participants to understand the fundamental concepts of well test analysis. 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. This powerful combination enables companies to undertake geophysical mapbased approaches, covering seismic interpretation, well correlation, seismic well tie, seismic attribute computation, and structural framework construction. Analog results wellhead pressure and temperature plots. Schlumberger log interpretation chart book pdf the schlumberger log interpretation chartbook was initially developed to correct raw wireline and lwd. Welltest analysis and interpretation techniques are problematic since there is a variety of alternative methods. Ehligeconomides, peter hegeman schlumberger oilfield services houston sven vik saga petroleum a. Well test interpretation resources and reserves evaluation assuring flow from pore to process waterflood management advanced well test analysis. Well tests conducted with the drillstring still in the hole. The basic drillstem test operation is divided for discussion into three phases.
Schlumberger aptitude tests preparation jobtestprep. 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. One or more pressure gauges are customarily mounted into the dst tool and are read and. Schlumberger announced today at the 2016 spe annual technical conference and exhibition the release of geotesting geologybased well test design and interpretation services.
To understand this important discipline, welltesting experts have developed definitions ranging from average reservoir pressure to dst and well interference testing. The schlumberger log interpretation chartbook was initially developed to correct raw wireline and lwd. 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. With petrel reservoir engineering 2020, reservoir engineers can generate a simulated production logging tool plt, which can be compared against a real plt taken in a well. This case study demonstrates that, in this particular setting, the use of the presented. The pie well test analysis program is a complete package for the manipulation and interpretation of pressure transient tests for oil and gas wells. Sep 27, 2016 geotesting services advance reservoir understanding for increased certainty. Rosalind archer, iskander diyashev, john spivey this course stresses practical application of well test theory to design and interpret pressure transient tests. Pdf the use of transient well testing for determining reservoir parameters and productivity of. Concert well testing live performance schlumberger. A laboratory test used to determine if a drilling fluid blocks movement of filtrate through pore spaces of a shale sample. Using only the a and b quality tests from the same tool run.
Participants will also learn about the interpretation of well test data. About the course formation testing and sampling tools fts with wireline and whiledrilling are widely used in explorationappraisal and reservoir development projects. Well test interpretation this well book summarizes the state of the art in well test interpretation. In each question there will be a missing step and you will be provided with a number of answers to choose from. All schlumberger case studies, product and technical data sheets, articles, interviews, animations, and more. Deconvolution should be the driving tool in well test interpretation. Deconvolution helps to refine initial pressure, provide a better understanding of the test and investigate further away in the reservoir. Basic concepts in well testing for reservoir description. Well integrity evaluation with wireline logs plug and abandonment workshop 14th june, stavanger, norway alberto. It allows the reconstruction of a constant rate drawdown response for all production and shutin periods combined gringarten, 2008. The log measures the photoelectric absorption factor, p e, which is defined as z10 3. Well test analysis and interpretation techniques are problematic since there is a variety of alternative methods.
Schlumberger log interpretation principles applications manual, both of which are widely available within most petroleum engineering offices. This day will focus on teaching participants about the interpretation methodology of various types of well testing. Schlumberger are looking for people whose personality fits the culture of the firm, who are handson and work well as part of a team. Well test objectives exploration well on initial well, confirm hc existence, predict a first production forecast dst. While at sahslb he conducted reservoir simulation, gas storage, and tight gas application studies and taught industry short courses in well testing and production data analysis. The schlumberger sentree 3 provided the subsea quick. Bayesian deconvolution of oil well test data using gaussian. They want to know how you behave under pressure, how you solve problems, or how you go about getting your work done even in the face of adversity.
This fifth book in the schlumberger testing services set summarizes the state of the art in well test interpretation. It emphasizes the need for a controlled downhole environment and highperformance gauges both of which have made well testing a powerful reservoir description tool. Introduction to well testing by ned spe student chapter issuu. 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 well test support and elearning. Andy, schlumberger of canada, 8016th avenue sw, calgary, alberta, t2p 3w2 abstract. New regularization algorithms for solving the deconvolution. Pdf this paper presents new testing and analysis techniques to obtain. Basic concepts in well testing for reservoir description aberdeen. Schlumberger introduces well test design and interpretation. 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. Since fluids have very low atomic numbers, they have very little.
266 1206 326 460 930 255 102 41 180 712 710 1191 1287 834 1572 1304 1498 213 637 1089 856 940 819 625 1507 399 672 1465 971 723 470 1098 760 695