Case Study Dual Solution to Seal Tie-Down Bolts and Prevent Gas Leakage Project: Minor gas leakage was detected on a well in the North Sea originating from tie-down bolts on a casing hanger.The gas in the annulus stemmed from gas lift valves downhole. The original tie-down bolts had already been changed out with a like-for-like replacement only to find they started leaking again after a short period of time. Unity was approached to provide a more robust solution to prevent further gas leakage. Solution 1: • Unity developed a dual solution to address this issue. The first was a Sealing Cap to mount on top of the tie-down bolts to prevent any gas escaping. • The retrofitable, quick and easy to install design sealed over the top of the existing bolts, negating the

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