0086-21-58386256
CEMENT DESIGN IMPACTS ON LOG RESPONSE The closer the cement density is to that of the drilling fluid used, the more difficult it is to distinguish between a solid & a liquid The lower the compressive strength of the cement, the more difficult it is to "find" on a log, and requires use of specialty tools and evaluation software
Ahmed, A.E., 1977, A neutron logging method for locating the top of cement behind borehole casing: Journal of Petroleum Technology, v. 29, no. 9, p. 1089-1090.
The Dark Art of Cement Bond Log M.Yakimov 28-Sep-2012 Mikhail Yakimov, SEIC-TDD. Overview • Purposes of Cement Bond Logging • Typical Cementing Problems • Petrophysical Methods for Cement Bond Evaluation • Acoustic Methods in Detail • Log Quality Control
The Cement Bond Log (CBL) was introduced in the early 1960's as a method to determine the quality of primary cement.' Since its introduction, it has undergone a number of improvements in both the hardware used to make the measurements and the interpretation of the data.
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. The measure-ment is made by using acoustic sonic and ultrasonic tools. In the case of sonic tools, the measurement is usually displayed on a cement bond log (CBL)
migration. Radial bond logging allows for the identification of channels not readily identified on basic cement bond logs. Channel Channel may not be identified on 3' amplitude (average of 3' section). Mapping of 2' radials identify channel. Channel may appear as a spiral due to the tool spinning out of the hole. Light Weights Amplitude may not reach 0 mV but
The Cement Bond Logs (CBL) gives a continuous measurement of the amplitude of the first casing arrival at a receiver spaced 3 ft from an acoustic transmitter. The amplitude is a maximum in unsupported pipe, and a minimum for well cemented casing. The absolute reading is a function of casing size and thickness, cement bond quality, wellbore ...
It also provides a 5-ft-spaced variable-density log measurement, which you can use to qualitatively understand the bonding between cement and the formation. The SBT™ Beyond service extends the SBT service to the maximum casing size of 24 in., thus providing one of the widest casing size ranges in the cement evaluation segment.
View Notes - CBL-VDL.ppt from PETROLEUM 101 at Pandit Deendayal Petroleum University. CBL - VDL Cement Bond Log Variable Density Log Sonic Path in Cased Hole CBL measures casing to cement bond …
Cement bond log analysis is vital to ensure well integrity isn't compromised. Dr. Arash Dahi Taleghani, associate professor of petroleum engineering at Penn State University, will discuss this important measurement tool during TOPCORP's webinar, "Cement Bond Log and Its Interpretation", on Tuesday, May 21st from 1 to 2 PM ET.
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) ...
29-03-2021· Cement bond logs (CBL) and variable density log (VDL) are one of the vital logging techniques used to evaluate cement-casing-formation bonds before the well testing or execution of the production operation in the well. These logs are also crucial during the workover operation to maintain the integrity of the well. The logging techniques provide a clear view of the quality of cement bonds …
The RADii® Segmented Cement Bond Tool uses a single ceramic transmitter, an eight or sixteen segment receiver at 3 ft. and a single receiver at 5 ft. spacing. The segmented receiver generates a cement map which enables identification of cement channelling, while the single receiver generates the traditional cement bond log (CBL) and a variable-density log (VDL).
Cement bond logs were run as early as 1958 with early sonic logs and the temperature log was used to find cement top beginning in 1933. Cement integrity logs are run to determine the quality of the cement bond to the production casing, and to evaluate cement fill-up between the casing and the reservoir rock.
24-07-2016· Using a cement bond log, a variable density log and ultrasonic tools provide an indispensable, (but different), set of evaluative data. The objective of cement evaluation logs is to provide information to understand if we have achieved zonal isolation. If not, they can help to asses if a cement squeeze is possible to restore it.
03-07-2017· The Cement Bond Logging tools have become the standard method of evaluating cement jobs. They indicate how good the cement bond is. A cement bond log (CBL) documents an evaluation of the integrity of cement job performed on an oil well. It is basically a sonic tool which is run on wireline. Similar to a ringing bell, when no cement is bonded to ...
05-05-2016· The cement bonding evaluation method is one of research hot topics in acoustic well logging. According to the tool source frequency, cement bonding evaluation methods can be divided into sonic (around 20 kHz) and ultrasonic methods (several hundred thousand Hz). The sonic method, first proposed by Pardue et al. 17. Pardue, G. H., Morris, R. L., Gollwitzer, L. H., and Moran, J. H. (1963).
cement bond log. 1. n. [Drilling] A representation of the integrity of the cement job, especially whether the cement is adhering solidly to the outside of the casing. The log is typically obtained from one of a variety of sonic -type tools. The newer versions, called cement evaluation logs, along with their processing software, can give ...
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. The measure-ment is made by using acoustic sonic and ultrasonic tools. In the case of sonic tools, the measurement is usually displayed on a cement bond log (CBL)
17-02-2016· CEMENT BOND LOG (CBL) 2. A cement bond log (CBL) is a type of log that measures the loss of acoustic energy as it passes through casing. A cement bond log documents an evaluation of the integrity of cement work performed on an oil well. …
Title: Cement Bond Log.
cement bond log reliability and accuracy. An industry work group of cementing evaluation experts is developing a technical report describing the most recent advancements in the tools, methods and analytical processing tools. Industry is encouraged to participate in this activity.
This presentation by Dr. Arash Dahi Taleghani was delivered as part of an online TOPCORP symposium, "Hot Topics", for oil and gas inspectors broadcast throug...
11-04-2019· Cement Bond Logging (CBL) A standard CBL (Cement Bond Logging) tool uses sound energy to determine how well bonded the cement is to the casing. It is affected by the compressive strength of the cement with higher compressive strengths giving higher attenuation and larger percentage of bonded pipe giving higher attenuation.
10-10-2013· Cement bond logs are required to evaluate the isolation and protection of usable mineral resources, ground water aquifers. This protection an isolation is generally required in federally approved wells to a depth of 2,000' in non geothermal wells. Geothermal wells are cemented behined each casing string. Data Access and Acquisition.
06-04-2017· To do this, we run different kinds of well integrity logs like cement bond log (CBL), corrosions logs and leak detection logs. We examine our cement quality using CBL, VDL and Ultrasonic logs. Good cement means good zonal isolations and adequate support for our casings. We run corrosion logs like multi-fingered caliper logs and electromagnetic ...
View 2-cbl_dslt.ppt from OPSMGT 357 at Auckland. Cement Bond Logging with DSLT 1 KLC Schlumberger Private CBL-VDL CBL-VDL 2 KLC Schlumberger Private Basic Concepts &
cement bond log Feature. Peer reviewed (12)