Combination of usi and cbl vdl gives more complete picture high resolution from usi and formation arrivals on vdl. The following examples illustrate the basic interpretation concepts of cement bond logs. Case studies in evaluation of cement with wireline. Also, you must know how each portion of the cbl vdl, travel time, amplitude, etc. The cement bond log cbl service provides a detailed evaluation of the casing collar locator ccl, and the vdl or signature waveform presentation. Properly run and interpreted, cementbond logs cbl provide highly reliable.
Introduction this course is intended for people who are interested in learning more about well 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. Cblvdl log interpretation pdf republic of fenerbahce. Cost effective alternative to cased hole bond logging. Be prepared to run the cement bond log under pressure to reduce the effects of micro. The term of cbl is particularly refer to amplitude measurement of acoustic wave. Conventional cbl assumes the cement is homogeneous same density, same strength, same annular gap throughout the well signal is transmitted and picked up on receivers spaced at 3 and 5 feet 3 foot receiver used for pipe cement bonding. Pdf cement bond logs cbl andor cement evaluation logs are usually. In this well, usitcblvdl logs, inside 9 58 inch casing, indicate lack.
Good cement bond to casing produces a rapid damping higher impedance of bcl vdl resonance. Cbl vdl with short length and low eccentralization weight, is combinable with the msc platform. Early tools utilized a single transmitter and two receivers spaced at 3ft. Issues with cement bond and cement evaluation logscase studies conference paper pdf available december 2015 with 7,559 reads how we measure reads.
Learn about cbl amplitude, vdl displays, crains rules for cblvdl. A standard cbl cement bond logging tool uses sound energy to determine how well bonded the cement is to the casing. This article presents the key elements for cement bond log interpretation free pipe, good bond, hard formation, micro annulus free pipe. Single cbl 3 amplitude can not identify channeling. At the end of the seminar the participant will be able to perform a full interpretation and will know the uses and applications of several advanced open hole and cased hole logs. Epa hydraulic fracturing workshop, march 1011, 2011. Cbl logging tool is run on electric wire line cable after cementing job is done.
The measurement is made by using acoustic sonic and ultrasonic tools. If you continue browsing the site, you agree to the use of cookies on this website. Log interpretation includes cbl vdl, sector bond logs, usit, urs, and cast. A cement bond log cbl documents an evaluation of the integrity of cement job performed on an oil well. This amplitude is maximum in free pipe and minimum in wellcemented casing. Cbl spe papers related to cement bond logs this is a collection of spe papers that help with cbl interpretation. Note that log presentations as clean and simple as this are no longer available, but these. The variabledensity log is commonly used as an adjunct to the cementbond log, and offers better insights into its interpretation. At a minimum, the cbl must show external cement isolation of both the top and the bottom of the proposed injection zone and may be run to the base of the surface casing if desired. Full waveform capture using open hole sonic tool with rig rental costs rising and attempts to minimize costs, the need for fast, efficient and accurate log.
These procedures are to be followed when running and interpreting cement. Pdf issues with cement bond and cement evaluation logs. Cement setting time important for cbl interpretation. Usitcbl vdl bond index usit impedance image gas liquid channels. This amplitude is maximum in unsupported pipe and minimum in wellcemented casing. The wave train can be displayed as a variable density log vdl where the positive and negative cycles of. The evaluation of cement quality with acoustic measurements dates back to the late 1950. Learn about cbl amplitude, vdl displays, crains rules for cbl vdl imterpretation.
Our well integrity interpretation services concern the following logging tools data. Spe back to basics bond log theory and interpretation. The cement bond logging tools have become the standard method of evaluating cement jobs. We specialise in the cement bond log interpretation based on cased hole wireline tools. 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. Cement bond log cbl vdl the cement bond log cbl gives a continous measurement of the amplitude of sound pulses from a transmitter to receiver. Pdf issues with cement bond and cement evaluation logscase. Good cement low amplitude on cbl, high acoustic impedance on usi. The cement bond log instrument acquires an omnidirectional, highresolution fullwave acoustic data in cased and open holes. Crains petrophysical handbook cement integrity logs. It is basically a variety of acoustic logging tools running. In addition to providing cement bond information, the cet can be used for determining corrosion by presenting calliper measurements and, in.
Cement integrity logs cbl vdl crains petrophysical handbook. This technique improves vdl interpretation, particularly in soft. 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. Cbl spe papers related to cement bond logs casing integrity.
Therefore, due diligence and care should be taken in interpreting cement. For all the cbl vdl interpretation with doubt or when complex cement is used, i suggest the consideration of spe and its application. Bond log theory and interpretation slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Anyone taking this course should be somewhat familiar with oil or gas well design and terminology. The wave train can be displayed as a variable density log vdl where the positive and negative cycles of the wave. A well log is a record of the well depth verses some physical parameter of the well. Cement bond log, or in short cbl, is a basic method to evaluate cement quality in the annulus. One ceramic monopole transmitter and two ceramic receivers are used to.
Case studies in evaluation of cement with wireline logs in. Archdrill is an independent consulting company providing thirdparty interpretation. It is basically a sonic tool which is run on wireline. Cementing, cement quality evaluationlogs and zonal.
Zone isolation is acceptable when the cbl confirms the minimum required interval see cbl interpretation guide. Epa hydraulic fracturing workshop, march 1011, 2011 arlington, va 22202 theme 1. Dont throw away your old lamp making the fiberglass mold for 3d wall panels duration. It accurately infers directly the cement quality from the degree of acoustic coupling of the cement to the casing and to the formation. These tools cbl vdl interpretation operate at higher frequencies than conventional openhole toolsbetween 20 and 30 khz. Cased hole log interpretation princlplesfappllcatlons. Cbl vdl interpretation would the one string be well centralized inside the second string. The cement bond log cbl gives a continous measurement of the amplitude of sound pulses from a transmitter to receiver. Finding cbl spe papers from the society of petroleum engineers can be a challenge so they have been collected here. The cet generally provides better cement bond evaluation than cbl vdl and is unaffected by microannuli. The examples in this section are taken from cement bond log interpretation of. Cbl vdl cbl cement bond log, vdl variable density log used to check the bond of cement between casing and formation. Cement evaluation a risky business glen benge benge consulting spe 170712.
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