“Kuwait Oil Company (KOC) is a major Oil producing company in the state of Kuwait. Chemical treatment is a primary measures for mitigating internal corrosion of process equipment at crude gathering centers as part of asset integrity management. As oxygen is highly oxidizing agent for corrosion Oxygen Scavenger is injected to the brackish water stream to minimize the dissolved oxygen in the system and hence to mitigate corrosion.The Oxygen Scavenger has a property of crystalizing at low temperatures below -100C (14oF). This crystallization can affect the injection at the quills’ end. In the present case study many oxygen scavenger injection quills found to be chocked at the tip of injection quill preventing the actual flow of chemicals to the brackish water stream. Therefore the case study shall cover the investigation to identify the main root cause for choking the quill and remedial measures to prevent the choking.Key words: Oxygen Scavenger injection quills crystallization choking.