TECHNOLOGICAL TRANSFORMATION AND APPLICATION OF BACK PRESSURE VALVE IN DEEP WELL

Casing back pressure valve plays a important role in well cementing operation as a casing accessories.In view of technical requirement working in well cement in high temperature and deep well,A new steel cylinder hemisphere back pressure valve was developed,introduced its composition,operating principle,performance parameters,ground testing and effectiveness of field application.Compared its applications with older steel back pressure valve, it shows that the new vale can satisfy the working demands of well cementing and its performance more reliable.It can improve cement quality in high temperature and deep well.