Abstract: B304 is wildcat well,better oil and gas show existed in the drilling process.In order to ensure the smooth cementing construction and qualified quality,we improved the washing fluid performance,increased the space fluid system optimization, screened anti - channeling cement slurry system,consulted well cementing technical materials with flush and leakage, formed controlled pressure well cementation,which better solved the problem of small liquid column density adjusment widow size,difficult well face oil stain cleaning and low cement slurry displace efficiency caused in cementing construction and ensured the safe cementing construction and qualified cementation quality.