Casing leakage (now confirmed as stage collar)

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Casing leakage (now confirmed as stage collar)

Dear colleagues,

We have lowered 244.5 x 11.99 mm (9 5/8 x 0.472 inch) casing at depth 4560 m with the multistage cement collar at 1975 m at our well. After that we conduct two stage of cementing and pump slurry from bottom to surface. Now we get a problem with pressure test for casing lower section and we looking for leakage.

Could you suggest some effective tool tool seal it? After, of course, we find it. Next section bit will be 215.9 mm (8 1/2 inch) and production casing will be 177.8 mm (7 inch) with the 194.4 (7.656 inch) coupling.

Thank you