The cement quality, Casing to Cement bond and Cement to Formation bond of a well determine the integrity of the Hydraulic seal required to isolate a Gas Producing Zone. This is extremely important as inadequate cement quality or bonding can result in unwanted fluid migration, environmental hazards and poor quality or quantity of the production of CBM gas. Thus to prevent these hazards and to improve the performance & economics, it’s very essential to identify, evaluate and mitigate risks to well-integrity. Cased –Hole Cement Bond Logging is the best method in this scenario. MAPL has numbers of best Sonic Tool with CCL (Casing Collar Locator) and highly experienced professionals available in the industry for this purpose.