High pressure rotary circulation head is used for drill pipe log as drilling direction hole. It is made up of connection joints withdouble-ball bearing. It has fine wear hardness because of adoptingspecial heat treatment on bearing track. With nylon rubber seal, it hasreliable sealing and can bear working pressure up to 30MPa.When using, remove swivel, fit drill-stem on its bottom and then fix high-pressure water pipe on its side to make mud circulation. Seal oil cylinder is installed on its top, measurement cable can pass through the center of seal oil cylinder to the bottom of well, thereby to bring about drill pipe log.
 
Property Parameter
 

Type	Directed drilling	Repairing hole
Connection thread	NC50（411）	NC38（311）
Union specifications(mm)	101.6（4"）	50.8(2"）
Cable specifications（mm）	8	8