Cement Bond Log

Cement bond log

1. NURUL ANISAH BINTI HAJI IBRAHIM DIPE06/16/0618 ‹#› CEMENT BOND LOG (CBL) PE4301 PETROPHYSICS & WELL LOGGING:

2. OUTLINE INTRODUCTION APPLICATION PRINCIPLE INTERPRETATION OF CBL IMPORTANCES ‹#›

3. CEMENT INTEGRITY LOGS ‹#› CEMENT BOND LOG (CBL) CEMENT MAPPING LOG (CMT) ULTRASONIC CEMENT MAPPING TOOLS (CET) ULTRASONIC IMAGING LOGS (USI, BRT)

4. CEMENT BOND LOG ‹#›

5. INTRODUCTION ‹#› Measures the integrity of cement bond between tubing/casing and well bore. The log is typically obtained from a sonic tool which detects the bond of the cement to the casing and formation via a principle based on resonance . Documents an evaluation of the integrity of cement work of a well. It is done after the cement are set properly in the well.

6. ‹#› Cement bond logs are used to detect the presence or absence of external cement behind casing. Proper cement placement between the well casing and the formation is essential: To ensure mechanical support of the casing. Protection from fluid corrosion. Isolation of permeable zones at different pressure regimes to prevent hydraulic communication. Prevent fluid from leaking to the surface. APPLICATION

7. ‹#› A sonic tool is typically run on wireline. Transmitter sends acoustic wave to casing/cement. Receivers receive acoustic signal that transfer through casing to cement and reflects to receivers. Acoustic wave at receivers is converted to amplitude (mV). PRINCIPLE

8. ‹#› A typical cement-log presentation includes: A correlation curve (gamma ray), travel time (μsec) Amplitude (mV) Attenuation curves A full-waveform display. INTERPRETATION OF CBL

9. ‹#› INTERPRETATION OF CBL GOOD CEMENT · “Amplitude” low. · “VDL” formation signals are strong. · Good cement. No need for squeeze Casing that is not bound has a higher resonant vibration than that which is bound, causing the imparted energy from the sonic signal to be transferred to the formation. In this sense, the amplitude of the waveform received is the basic measurement that is evaluated.

10. ‹#› IMPORTANCE D etermine the quality of the cement bond to the casing. Evaluate cement fill-up between the casing and the reservoir rock. Measure the compressive strength of the cement, the bond index, and in some cases, the quality of the casing string itself. Relatively inexpensive and almost every wireline company has a version of the tool.

11. THE NAME IS BOND, CEMENT BOND. THANK YOU!

12. ‹#› REFERENCES https://www.spec2000.net/07-cementlog1.htm http://petrowiki.org/Cement_bond_logs https://en.wikipedia.org/wiki/Cement_bond_log http://www.drillingformulas.com/what-is-cement-bond-lo/ http://www.slb.com/~/media/Files/production/product_sheets/well_integrity/cement_bond_logging_tools.pdf http://www.slb.com/services/drilling/cementing/cement_evaluation.aspx http://www.bridge7.com/grand/log/gen/casedhole/cbl.htm https://www.linkedin.com/pulse/bond-cement-bonda-quick-guide-reading-cbl-william-fogerty http://www.kdheks.gov/geo/download/seminar_2015/5%20Workshop%20-%20Leeth%20-%20cement-bond%20logs.pdf https://higherlogicdownload.s3.amazonaws.com/SPE/5fc0079d-67a5-4dd9-a56f-190534ef5d3d/UploadedImages/April16_BtoB.pdf