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