The discovery of large gas bubbles in the cellar of well TLJ-237 and its surroundings is a potential hazard that could inhibit repair work on the well. We need to know the source of the gas. From the identification results, the gas bubbles are likely coming from the other layers of the water breakthrough, but this is still undetermined, and a leakage in the casing of well TLJ-237.rnThe TLJ-237 well initially produced from the R8 layer by means of natural blowholes (SA/17) with a Gross/WC/Nett at 999 BFPD/5%/949 BOPD. But within 11 days, its water content increased to 91%.rnTo ensure these conditions, case hole ultrasonic logging was undertaken and this aims to detect the presence of fluid flow behind the production casing in well TLJ-237.rnThe steps included:rn1. PFC (Perforating Formation Correlation) logging as a dummy run with intervals of 0-1747 m (total depth)rn2. Flowpoint, Leak Point, Pressure/Temperature at intervals of 0-1753.2 m (total depth)rnBased on the analysis of the data obtained, it is probable that the main source of the rise of gas bubbles on the surface of a shallow gas reservoir is ME1, where gas flows from the point of the reservoir ME1 to the surface. Tentative conclusions can now be used as a reference to take the necessary steps forward.
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