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• W4240750355 abstract "Microannulus Effect on Cementation Logs: Experiments and Case Histories J.J. Jutten; J.J. Jutten Dowell Schlumberger Search for other works by this author on: This Site Google Scholar A.J. Hayman A.J. Hayman Schlumberger Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Asia Pacific Oil and Gas Conference, Singapore, February 1993. Paper Number: SPE-25377-MS https://doi.org/10.2118/25377-MS Published: February 08 1993 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Jutten, J.J., and A.J. Hayman. Microannulus Effect on Cementation Logs: Experiments and Case Histories. Paper presented at the SPE Asia Pacific Oil and Gas Conference, Singapore, February 1993. doi: https://doi.org/10.2118/25377-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Asia Pacific Oil and Gas Conference and Exhibition Search Advanced Search SPE MembersAbstractExperiments were conducted to study how sonic and ultrasonic cementation logs are affected by microannuli. By creating both gas- and liquid-filled microannuli of known sizes at the casing-to-cement interface, measurements could be recorded and analyzed.Depending on the nature of the fluid and the size of the microannulus, results showed that all cementation logs were sensitive to microannuli. Gas at the casing-to-cement interface had a very strong effect on the ultrasonic measurement but had minimal effect on traditional sonic Cement Bond Log (CBL) measurement if the microannulus was in the range of one m. CBL measurement was very sensitive to water-filled microannuli. Ultrasonic measurements were capable of evaluating the quality of the cement behind a water-filled microannuli as large as 100 m. Liquid-filled microannuli could be identified through the large coupling attenuation measured with multi-spacing sonic tools.Analysis of these experiments brings new insights to cementation-log interpretation.IntroductionInterpretation of cementation logs is without any doubt subject to controversy. For over 30 years, CBL measurements have been used to evaluate cement jobs. More recently, special tools have been developed to overcome some of the limitations of the traditional sonic measurements. Use of ultrasonics, has made it possible to improve cement evaluation, mainly through a spatial resolution which allows a much clearer identification of incomplete mud removal. However, using higher frequency waves renders the signal more sensitive to the local events, such as poor pipe-surface condition.In many cases, field experience and theories have helped people to better understand the response of the tools to specific situations. When a small gap exists between the casing and the cement, the response of acoustic and ultrasonic tools is affected. There is a microannulus effect which renders cement job evaluation even more difficult. Several articles have been published to explain how a microannulus can be created or induced and how this affects cementation logs. Temperature or pressure changes are the most common causes of microannuli (see Appendix 1 for usual formulae).P. 505^ Keywords: ultrasonic cement log, isolation, cement and bond evaluation, attenuation rate, impedance, casing and cementing, amplitude, sonic measurement, indication, mrayl Subjects: Casing and Cementing, Cement and bond evaluation This content is only available via PDF. 1993. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4240750355 title "Microannulus Effect on Cementation Logs: Experiments and Case Histories " @default.
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