Introduction to cement bond logs february fact sheet 2017 cement bond log tools cbls have evolved over the years as technology and telecommunications have advanced. Jun 29, 2012 basic evaluation of south louisiana well log. The cement bond log clearly indicates top of cement, free pipe, and gives an indication of well cemented pipe. The cement bond log cbl gives a continous measurement of the amplitude of sound pulses from a. Spe back to basics bond log theory and interpretation. Conventional interpretation of this data may mislead one into thinking the cement bond is inadequate, and cause one to order expensive and completely unnecessary remedial cementing. Pdf issues with cement bond and cement evaluation logs.
To estimate bond index, choose intervals on the log that correspond to 0% bond and 100% bond. Epa hydraulic fracturing workshop, march 1011, 2011. Cbl vdl interpretation pdf bond log theory and interpretation. Free and accessible to those needing answers and technical. The signal is received, processed, and displayed as a microseismogram.
The shortfalls of a cement bond log cbl, a variable density log vdl, and ultrasonic tools. Cement bond logging tools cement bond tools measure the bond between the casing and the cement placed in the annulus between the casing and the wellbore. Qualitative interpretation of the cementtoformation interface. It was a stretch to say that these early amplitude based cbl tools could prove there was or was not a channel, but at least techniques were developed to provide qualitative interpretation of channeling. Cblvdl cbl cement bond log, vdl variable density log used to check the bond of cement between casing and formation. Files of the type cbl or files with the file extension. Succeeding chapters 2 through 6 introduce the reader to specific log types.
Cblvdl log interpretation pdf republic of fenerbahce. Properly run and interpreted, cementbond logs cbl provide highly reliable estimates of well integrity and zone isolation. Cbl vdl cbl cement bond log, vdl variable density log used to check the bond of cement between casing and formation. Interpretation log porosity permeability earth sciences. One ceramic monopole transmitter and two ceramic receivers are used to. This new measurement combined with conventional cement bond log data and. Cement evaluation objectives is the material behind the pipe a solid or liquid. The cement bond log cbl gives a continous measurement of the amplitude of sound pulses. Wellog is currently sponsoring a web based seminar called a webinar on log interpretation fundamentals. Just as filtrate invasion and formation alteration may produce changes in formation acoustic properties.
Pdf cement bond logs cbl andor cement evaluation logs are. Knowing the condition of the well concerning cementation and casing are the primary services that archdrill offers. Miscalibration, inadequate information, and a severe lack of standardization are enough to push petroleum engineers into a morass of bewilderment. Jul 04, 2019 cbl vdl interpretation pdf bond log theory and interpretation. Unfortunately, the list of uncertainties inherent with. Aug 12, 2019 cbl vdl interpretation pdf bond log theory and interpretation. Additionally, custom log formats are available for a variety of applications to enhance data clarity. Scribd is the worlds largest social reading and publishing site. Pdf issues with cement bond and cement evaluation logscase. These features paired with quantitative interpretation by gyrodatas experienced. A well log is a record of the well depth verses some physical parameter of the well. Crains petrophysical handbook cement integrity logs.
Oct 08, 2018 cement bond log, or in short cbl, is a basic method to evaluate cement quality in the annulus. Using a statistical variation process, the advanced cement evaluation ace method provides fast, accurate interpretation of rcbl data, clearly revealing cement bond integrity. Oct 20, 2015 bond log theory and interpretation slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. This webpage version is the ed intellectual property of the author. Wellog will provide answers to your log interpretation questions free of charge. Case studies in evaluation of cement with wireline logs in a. Mar 22, 2019 the cement bond log cbl service provides a detailed evaluation of the casing collar locator ccl, and the vdl or signature waveform presentation. Issues with cement bond and cement evaluation logscase studies. Tool response depends on the acoustic impedance of the cement. Cement integrity logs cbl vdl crains petrophysical handbook.
Our main service offering is cased hole wireline data interpretation of ultrasonic, sonic cblvdl and multifinger tools. Case studies in evaluation of cement with wireline logs in a deep. Cbl spe papers related to cement bond logs this is a collection of spe papers that help with cbl interpretation. Issues with cement bond and cement evaluation logscase studies conference paper pdf available december 2015 with 7,773 reads how we measure reads. Part v log interpretation do not rely on the service company charts for amplitudes corresponding to a good bond. The acoustic signal travels through borehole fluid, casing, cement, and the formation itself. Do not copy or distribute in any form without explicit permission. The measurement is made by using acoustic sonic and ultrasonic tools. 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. Sep 08, 2019 cbl vdl interpretation pdf bond log theory and interpretation. Jul 24, 2016 using a cement bond log, a variable density log and ultrasonic tools provide an indispensable, but different, set of evaluative data. From the 1950s basic single transmitter and dual receiver design with analog communication and zero reprocessing capability, industry has moved to broadband transmitters. The term of cbl is particularly refer to amplitude measurement of acoustic wave. What you need to convert a cbl file to a pdf file or how you can create a pdf version from your cbl file.
Perforation cbl vdl log interpretion models fluid flow behind casing monitor well and reservoir performance perforation systems and pipe recovery. Anyone taking this course should be somewhat familiar with oil or gas well design and terminology. In general terms, a high signal amplitude indicates poor cement bond. The challenge of variable density and cement bond log interpretation. No cement bond is represented by 100 percent amplitude. Cbl spe papers related to cement bond logs casing integrity. Perforation cblvdl log interpretion models fluid flow behind casing monitor well and reservoir performance perforation systems and pipe recovery. Do not depend on a conventional cbl to evaluate isolation over short intervals advanced sonic tools give more data with less averaging. Cement bond log, or in short cbl, is a basic method to evaluate cement quality in the annulus. Office of conservation injection and mining division po box 94275 capitol station. If the fluid changes between two points, the travel times may drift, causing difficulty in interpretation and quality control. Acoustic logs do not measure cement quality directly, rather, this value is inferred from the degree of acoustic coupling of the cement to the casing and to the formation. Finding cbl spe papers from the society of petroleum engineers can be a challenge so they have been collected here.
This amplitude is maximum in unsupported pipe and minimum in wellcemented casing. Conventional cementbond logs cbls comprise a pulsed transmitter and several receivers of acoustic energy positioned as a vertical array of transducers. Examples of good cement bond and free pipe and what things to look for. Problems setting t2 are often experienced with short logging lines, typically less than 10,000 feet. The cement bond log cbl gives a continous measurement of the amplitude of sound pulses from a transmitter to receiver.
The cement bond log instrument acquires an omnidirectional, highresolution fullwave acoustic data in cased and open holes. The wave train can be displayed as a variable density log vdl where the positive and negative cycles of the wave train are shaded black and. Cement bond logs cbl andor cement evaluation logs are usually conducted to evaluate the quality of the cement bond behind a cemented casing or liner before a. Ace service is a new method of interpreting the cbl and ultrasonic data youre already capturing. Epa hf workshop march 1011, 2011 arlington, va tsa, inc. The wave train can be displayed as a variable density log vdl where. It accurately infers directly the cement quality from the degree of acoustic coupling of the cement to the casing and to the formation. Introduction this course is intended for people who are interested in learning more about well logs. The variabledensity log is commonly used as an adjunct to the cementbond log, and offers better insights into its interpretation. Case studies in evaluation of cement with wireline logs in. Cement setting time important for cbl interpretation. Amplitude is normally presented on a scale of 0 to 100 percent amplitude.
Wellog will provide training on logging and log interpretation. Cbl in well bonded cement low amplitude means good bond. Issues with cement bond a nd cement evaluation logs case studies. Halliburtons radial cement bond log tool records waveform data digitally, allowing real time data transmission during logging, and advanced data processing at surface. Crains petrophysical handbook cement integrity logs cbl. The cbl must be correlated back to the open hole log of the subject well or to the open hole log of the offset well from which the proposed injection zone was selected if there is no open hole log of the subject well. If you continue browsing the site, you agree to the use of cookies on this website.
Dec 30, 2019 the cement bond log cbl service provides a detailed evaluation of the casing collar locator ccl, and the vdl or signature waveform presentation. It is basically a variety of acoustic logging tools running. The objective of cement evaluation logs is to provide information to understand if we have achieved zonal isolation. If run too early before cement is set, may indicate poor bonding and an unnecessary squeeze operation. Our main service offering is cased hole wireline data interpretation of ultrasonic, sonic cbl vdl and multifinger tools. Single cbl 3 amplitude can not identify channeling. As with most of the wellog website, improvements and additions occur every day.
Cbl logging tool is run on electric wire line cable after cementing job is done. Cement bond log interpretation confidence interval casing. The text discusses how different log types measure various. Interpretation log free download as powerpoint presentation. Our support for your well are in the areas of casing integrity. A presentation of the acoustic waveform at a receiver of a sonic or ultrasonic measurement, in which the amplitude is presented in color or the shades of a gray scale. Cement bond log interpretation free download as pdf file. The cement bond log cbl service provides a detailed evaluation of the casing collar locator ccl, and the vdl or signature waveform presentation.
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