WELL LOGGING TECHNIQUESOil India
ACOUSTIC (SONIC) LOGGING •Based on propagation of sound waves in the • Conventional method wireline logging can not be used in case of highly deviated or horizontal wells or wells with severe downhole problems •Cement Bond Log To evaluate quality of
Chat OnlineAn acoustic-wave theory for casing bond evaluation using
May 24 2018 · Slip boundary condition is commonly utilized to model elastic wave propagation through layered earth media. The same approach is used here to characterize acoustic wave propagation along a cased borehole with various cement bond conditions. By modeling the cement layer between casing and formation as a viscoelastic slip interface with complex coupling rigidity parameters one can not
Chat OnlineUnderstanding acoustic methods for cement bond logginga
May 01 2016 · adshelp at cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
Chat OnlineEPA Hydraulic Fracturing Workshop March 10-11 2011
Cement Evaluation • Two classes of sonic logging tools (1) sonic (CBL/VDL) or SBT and (2) ultrasonic (USIT/CAST-V) • Acoustic cement bond logs do not measure hydraulic seal but instead measure loss of acoustic energy as it propagates through casing. This loss of energy is related to the fraction of casing perimeter covered by cement
Chat OnlineClassification of logsSlideShare
Mar 16 2018 · Acoustic logs a) Cement bond logs (CBL) Properly run and interpreted cement- bond logs (CBL) provide highly reliable estimates of well integrity and zone isolation. Just as filtrate invasion and formation alteration may produce changes in formation acoustic properties and thus variation in acoustic logs over time so also cement-bond logs
Chat OnlineMultipole borehole acoustic field in a transversely
Aug 22 2019 · " Acoustic logging guided waves in transversely isotropic formation " in Proceedings of the SPWLA Twenty-Ninth Annual Logging Symposium June
Chat OnlineUSB2Use of electromagnetic acoustic transducers
A bond log device comprising a sonde an acoustic transducer and an acoustic receiver. The acoustic transducer is comprised of a magnet combined with a coil where the coil is energizable by an
Chat OnlineIntegrity eXplorer cement evaluation service
The Integrity eXplorer™ cement evaluation service from Baker Hughes provides accurate information that helps operators gain an understanding of the cement bond—regardless of weight or contamination—to make critical downhole decisions with confidence. Using patented electromagnetic-acoustic transducer (EMAT) sensor
Chat Online(PDF) Issues With Cement Bond and Cement Evaluation Logs
The case histories in this paper illustrate the importance of understanding how the cement bond and evaluation logs are acquired and processed so that proper decisions can be made regarding the
Chat OnlineA Practical Approach to the Interpretation of Cement Bond Logs
For cement bond log purposes the wave front that moves directly to the casing is of primary interest. As it impinges on the casing some energy is reflected while the balance is transferred into the steel the cement sheath and the formation. See Fig. 1. All materials surrounding the
Chat OnlineUnderstanding acoustic methods for cement bond logging
Understanding acoustic methods for cement bond logging. Well cementation is important for oil/gas production underground gas storage and CO2 storage since it isolates the reservoir layers from aquifers to increase well integrity and reduce environmental footprint. This paper analyzes wave modes of different sonic/ultrasonic methods for
Chat OnlineResistivity Toolan overview ScienceDirect Topics
Cement bond/variable density log Sonic cement bond system Acoustic cement bond log Microseismogram Gamma ray neutron the detected pore pressure from the LWD logs is not the one at the bottom hole. Therefore the log-based methods should be combined to other methods (e.g. Dxc method in which the parameters are obtained from the bit
Chat OnlineMETHODS AND APPARATUS FOR ACOUSTIC TRAVEL TIME AND CEMENT
As previously discussed this configuration may be used for either acoustic travel time logging or for cement bond logging in a cased borehole. Switching means carried in the upper portion 55 of the sonde 57 are utilized to select four of the receiving transducers for use
Chat OnlineSCIN TechnologySteel Cement Interfacial Nanobond
Sonic cement evaluation logs have been used since the late 1950s to quantify the presence of cement behind casing. The bond between casing and cement placed in the annulus is a critical component of wellbore construction. Bond integrity is inferred after the cement has cured using acoustic methods well-known in the industry.
Chat OnlineAcoustic logging toolsPetroWiki
Jun 24 2015 · The most commonly used acoustic-wave property acquired in borehole logging is the compressional-wave velocity. Modern velocity-logging tools measure the time Δ t required for a compressional or shear wave to travel through a fixed distance of formation it
Chat OnlineHow to evaluate cement behind casing (CBL) and corrosion
The one thing that differs ultrasonic evaluation tool from the traditional or radial cement bond log is the ability to measure flexural wave attenuation. The flexural wave attenuation can be cross-plotted together with the acoustic impedance to see the type of materials we see behind casing. It s extremely useful if we use light cement.
Chat OnlineGeophysical Methods for Characterization and Monitoring
logging methods provide the best resolution but sample the smallest volume of an aquifer whereas surface methods lithology cement bond evaluation fracture evaluation lithology mechanical properties fracture permeability C Single Point Acoustic reflectivity and borehole diameter Fracture locations and orientations lithology
Chat OnlineCrain s Petrophysical Handbook Casing And Tubing
Casing inspection log over suspect area shows good casing. Ignore the cement quality indicator on the right edgeit is just plain WRONGsee below. Cement integrity log over suspect interval shows a bad cement job. White on cement map is a channel and black is good cement. giving a Bond
Chat OnlineCEMENT BOND LOG INTERPRETATIONBridge7
The Cement Bond Log (CBL) gives a continous measurement of the amplitude of sound pulses from a transmitter to receiver. This amplitude is maximum in unsupported pipe and minimum in well-cemented casing. The wave train can be displayed as a Variable Density Log (VDL) where the positive and negative
Chat OnlineCEMENT BOND LOG INTERPRETATION
Acoustic logging is also used for determination of cement bondin cased wells. This type of log is most often referred to as a Cement Bond Log (CBL).
Chat OnlineUSB2Use of electromagnetic acoustic transducers
A bond log device comprising a sonde an acoustic transducer and an acoustic receiver. The acoustic transducer is comprised of a magnet combined with a coil where the coil is energizable by an
Chat OnlineUnderstanding acoustic methods for cement bond logging
This paper analyzes wave modes of different sonic/ultrasonic methods for cement bonding evaluation. A Two dimensional finite difference method is then used to simulate the wavefield for the
Chat OnlineBorehole Acoustic LoggingTheory and Methods Hua Wang
Borehole Acoustic LoggingTheory and Methods. Details advances and trends in acoustic logging-while-drilling and cased-hole logging over the last decade. Presents potential solutions for the current challenges in data acquisition in different formations and fortool eccentricity on the wavefield. Provides a full analysis of the included 3D
Chat OnlineWELLOG log interpretation
Acoustic logging is also used for determination of cement bond in cased wells. This type of log is most often referred to as a Cement Bond Log (CBL). Acoustic signals propagated in steel casing are observed to have large amplitude in free casing because much of the energy is retained in the casing.
Chat OnlineCEMENT EVALUATION ITS NOT JUST ABOUT A BOND LOG
There must be an understanding of the importance and Temperature Surveys Acoustic Logging . TEMPERATURE LOGS Generally used for determining top of cement or lost circulation zone 3 foot receiver used for pipe / cement "bonding" 5 foot receiver used to get a qualitative indication of formation bonding .
Chat Online3D numerical simulations of the acoustic radiations
The cement bond quality at the casing-cement and the cement-formation interfaces is an important factor for oil-well production (He et al.2014 Wang et al.2016). In this paper we numerically establish a cased wellbore model and further study remote detection using an arcuate acoustic source.
Chat Online3D numerical simulations of the acoustic radiations
The cement bond quality at the casing-cement and the cement-formation interfaces is an important factor for oil-well production (He et al.2014 Wang et al.2016). In this paper we numerically establish a cased wellbore model and further study remote detection using an arcuate acoustic source.
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