It is used to remove or lessen the internal stress of casing in heat expansion during thermal recovery and steam injection. The thermal stress compensator is used to remove or lessen the internal stress of casing in heat expansion during thermal recovery and steam injection. The...

Well cementation uses drilling free plugs which consists of staged cementer and external casing packer. Well cementation uses drilling free plugs which consists of staged cementer and external casing packer. First expand the packer, then cementing, and take out of the internal...

The external casing packer is used for staged packing of open holes for further operation. The external casing packer is used for staged packing of open holes for further operation. The pressure opens the packer’s rubber for setting. It mainly consists of central pipe,...

The well-flushing valve is used together with sealed inserts, for well completion, well flushing, acidizing, acid pickling.   The well-flushing valve is used together with sealed inserts, for well completion, well flushing, acidizing, acid pickling. The valve body runs...

.It is used in well cementing. During cementing, the circulating channel is opened with pressure for cementing. It is used in well cementing. During cementing, the circulating channel is opened with pressure for cementing. Afterwards, close with plugs or pressure. It mainly...