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ABSTRACT Weatherford Co,. Ltd. is providers of products and services that span the drilling, evaluation, completion, production and intervention cycles of oil and natural gas wells. From into practice in the cooperative education project and which has been assigned to training in the department Artificial Lift system. And in the practice of cooperative education assigned to study and prepare report on the topic. “Solving the leakage of pump W300H by changing the packing” That is solution about leakage of pump W300H, it use to inject the power fluid into the well productions. The solution has many methods to solving such as changing the Ball valve in Cylinder Fluid Head, changing Stuffing Box, changing Extension rod and changing packing of plunger. The changing of plunger and changing the Ball valve in Cylinder Fluid Head, they are very necessary to operate because the packing has an expiration of work. But in the problem packing has a period working less than usual, that has problem from the debris in the power fluid, the tilt extension rod, the stuffing box it wear and that resulted in the packing gets scratched. That is why we need to focus and looking for a way to solve the problem about the age of the implementation of packing to have a more.