Cbl vdl interpretation pdf
Example Log The first time you look at a log it may be a little overwhelming and figure out what all of the squiggly lines mean. 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. CBL-VDL LOG INTERPRETATION PDF - Quick basics of purposes of cement & scenarios bond logs run in Variable Density Log (VDL). is a very small (annular gap) between casing and cement sheath and can result in misinterpretation of CBL/VDL. Switching sensors Optical sensors Special sensors Stainless steel sensors Forked sensors Measuring sensors Optical distance sensors Sensors for positioning Connection cables Reflectors and reflective tapes.
Advanced cement mapping clearly distinguished micro-debonded cement as low AI solids or liquids which is a limitation in Ultrasonic measurements. CEMENT BOND-VARIABLE DENSITY (CBL/VDL) The casing is vibrated in longitudinal mode via an acoustic source generating compressive (P type) waves. The clearest indication of underperformance of the system is a high rate of Provider Aborts. In this analysis, the cement evaluation logs comparison between the two classes of sonic logging tools which are sonic CBL/VDL and SBT/VDL had been used to evaluate thermal cement bond before and post the CSS in FNE-X0 and FNE-X1 well candidates. Slotted Waveguide Antennas Unlike wideband antennas like the biquadslotted waveguides are resonant antennas, oomnidirecionais have a relatively narrow operating frequency range. For all the cbl vdl interpretation with doubt or when complex cement is used, I suggest the consideration of SPE and its application.
Most 3'-5' CBL's cannot identify a 1/2" channel in cement.
Without having basic knowledge on cement recipe it is not easy to evaluate cement integrity behind casing and whether isolation is performed. Notice the use of the expanded amplitude scale (0 to 20 mv) to accentuate the change. The display is usually monochrome (black and white) however in some presentations, the display is in color. The physics of conventional sonic amplitude log,CBL-VDL,CET(or PET) and the similar approach to the evaluation of cementation quality are reviewed.
The course is intended for engineers and geo-scientists and technical assistants needing to understand better, the principles of log interpretation and/or to update themselves on the range of log measurements and techniques now available to them, and to appreciate the complexities of interpretation in more complex reservoirs. Variable density log (VDL) with casing signal transit time may also be considered in the evaluation. Titan’s family of CBL tools come in a range of sizes to suite casings from 2-3/8 inch (60mm) to 14 inch (356mm). Cement-Bond-Log Interpretation Reliability Two kinds of cement-bond-log (CBL) tools are run as part of a standard cement-evaluation program. VARIABLE DENSITY LOG: The variable density display is a Z axis representation of the receiver waveform.
For each vertex we store a mask that denotes the strings which match at this state. In this paper , the improvement measure which we proposed aim at the relative method. These tools cbl vdl interpretation operate at higher frequencies than conventional openhole tools—between 20 and 30 kHz. Group 1: Classic Cement Bond Tool (CBL or SLT) These types of tools produce a single curve of 3ft Amplitude and 5ft VDL arrivals. log interpretation with strong experience with carbonate petrophysics after 15 years experience in the Middle East. Strong centralizers may abate tool eccentricity, but they also hinder tool movement, especially in horizontal wells. This article presents the key elements for Cement Bond Log Interpretation (free pipe, good bond, hard formation, micro annulus) Free Pipe. Two kinds of cement-bond-log (CBL) tools are run as part of a standard cement-evaluation program.
The unique design and variety of materials and coatings make the Inbal Deluge Valve ideally suitable for use in brackish or sea water, similar to those found in chemical and petrochemical facilities or in offshore platforms. A deeper investigating 5ft receiver confirms the interpretation and also shows formation bond by a full Variable Density Log (VDL) wave display. The I/O Kit is an open-source framework in the XNU kernel that helps developers code device References. Ultrasonic tools less affected than CBL/VDL and SBT (pads) in the presence of liquid in the gap with opposite effect in the presence of gas. First, you will see the proposed information such as USDW, zone and perforations; Next, you will see the CBL Interpretation Guide; Then, the open-hole log showing the zone; Finally, the CBL Free-Pipe Section and the CBL showing the TOZ and BOZ. While employing reflected sonic wave like CET or the similar approach in the evaluation of cementation quality, logs are to be tranformed to quantitative evaluation parameters.
Other miscellaneous logging techniques such as Caliper, Temperature, Perforation, Depth, rate etc. 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. Nitrogen-bonded and carbon-bonded o-complex formation in the reaction of pyrrolide anions with 1,3,5-trinitroben~ene'.~. Generally, pressure up casing to 1000 to 1500 psi to close the gap (if cement job was good). The described operational procedures and standard presentation have now been successfully implemented in hundreds of cases where the Oil Company witness has been helped in the interpretation of a CBL/VDL or a CET to determine the potential risk of a leaking barrier. The effectiveness of these tools and their evaluations often are challenged, and they are not regarded as a replacement for reservoir interzonal-communication tests performed between producing reservoirs. USIT not only evaluates Cement quality but also Corrosion if run in corrosion mode. Wellbore fluid & lightweight cement limitations Ultrasonic-CBL combination in class G cements is normally satisfactory Ultrasonic and Flexural Attenuation– Eliminates limitations imposed by traditional stand alone ultrasonics.
quantitative interpretation by Gyrodata's experienced logging services team, enables operators to make more confident decisions for complex reservoir situations. This amplitude is maximum in unsupported pipe and minimum in well-cemented casing. Well Logging Parameters (bulk Density , porosity, permeability, water saturation, reducible water saturation, resistivity index, Archie equation, bore-hole environment, logging environment etc) vi. The variable-density log is commonly used as an adjunct to the cement-bond log, and offers better insights into its interpretation; in most cases microannulus. Cement quality evaluation based on CBL-VDL(Cement Borehole Logging and Variable Density Logging) is affected by many factors,each effect of which on CBL-VDL data is quite different.
OD 2.5” 63.5 mm Length 16.4’ 5.03 m Weight 72.3 lb (90.4 lb with Telemetry) 33 kg (41 kg with Telemetry) Max. Also, you must know how each portion of the CBL (VDL, travel time, amplitude, etc.) influences another. The foam cement has lower compressive strength so the amplitude curve shifts to the right. hole logging tools to well log interpretation, casing integrity evaluation and reservoir production analysis and remedial operations. High CBL amplitude can be ambiguous • Liquid microannulus Channel • Contaminated cement Casing Coating Low amplitude doesn’t ensure 100% bond . The method includes processing ultrasonic data obtained from ultrasonic measurements on the interval of the wellbore to determine properties of the innermost annulus.
Commercially available CBL services offer a log containing the measurement of amplitude and VDL. The flange is designed so that a shroud substantially covers the working threads of the pipe for thread protection. EXAMPLE 12: CBL-VDL shows the transition from normal to foam cement just above 4650 feet.
Omni-directional (no azimuthal resolution) Ultrasonic – Tubular & solids evaluation. Cement Evaluation Tool (CET) In the cement evaluation tool (CET), transducers are placed circumferentially on the sonde to emit ultrasonic energy and then receive the reflected waveform back from the casing and beyond.
Cbl vdl interpretation would the one string be well centralized inside the second string. This interactive, applications-driven 5-day training course will highlight the techniques and principles of the main open and cased hole logging tools used in the oil industry for professionals who needs to deal with wireline logs in their daily job.
CBL VDL 17 5ft VDL • 5ft VDL gives deeper depth of investigation than 3ft CBL • 5ft VDL indicates cement to formation bond if casing to cement bond is good 18 Expected Free Pipe CBL Values Casing Weight Estimated transit Expected size (lb/ft) time (msec) free-pipe reading (ETT) 5 in. The course will discuss how cement behind double casing be identified and interpreted with careful interpretation. 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 Cement Bond Log (CBL) service provides a detailed evaluation of the casing collar locator (CCL), and the VDL or signature waveform presentation.
begin creating your own driver, you should make sure you understand the architecture of the I/O Kit by reading Architectural Overview in IOKit Fundamentals. The present disclosure provides methods and systems for analyzing cement integrity in a depth interval of a wellbore having a multiple string casing with an innermost annulus disposed inside at least one outer annulus. Casing inspection tools (principles, applications and limitations), Formations micro scanner (FMS), NMR logging principles. As support, a combination of two fiber optic measurements should offer additional information about the location of the leakage.