Study and application of polished rod seating on thermal recovery wellhead

On basis of investigation,the general problem of oil leaking from heavy oil wellhead in Karamay 6-9 block has been analyzed.Various wellhead seal assemblies have been designed and manufactured,and a new sealing material has been developed.Field experiment shows that,when different assemblies and materials are used for suitable situations,good seallng can be achieved,so as economic benefit.The input-output ratio is 1:6.73.