Stufenzementierer

Stage Cementer With inner-closing design,the SJG-A stage cementer can realize permanent self-locking after closing.The pressure-relief design prevents fluid trapping and compression between the opening device and the closing plug during the closing phase of the tool’s operation.The I.D. of upper/lower sub is the same as that of casing,but smaller than that of closing sleeve,which can minimize chances of damages to closing sleeve.The inner seats are made of an easily drilled butyronitrile rubber/aluminum material.Both the opening and closing seats lock against rotation for easy drillout.It is used in the operation of continuous cementing with pumping-down opening plug.* Parameters Specifications mmΦ177.8O.D. Max. (mm)208Drill-out I.D.(mm)155Overall length (mm)1182Rated load,t170Sealing Capacity (Mpa)25Opening pressure (Mpa)7Opening Force (kN)136Closing pressure (Mpa)5Closing Force (kN)95Lower Sliding Sleeve I.D. (mm)115Upper Sliding Sleeve I.D. (mm)125