A RETRIEVABLE PACKER USED IN DRILL STEM TESTING. IT IS RATED TO 10,000 PSI AT 350 DEGREE F. THE PACKER HAS HARDENED METAL SLIPS WHICH DIG INTO THE CASING AND ANCHOR THE DST STRING IN A FIXED LOCATION. IT ALSO HAS A RUBBER ELEMENT TO SEAL OFF TUBING TO THE ANNULUS. THE RUBBER ELEMENTS ARE PUT UNDER MECHANICAL COMPRESSION AT A GIVEN DEPTH BY MOVEMENT OF THE TOOL BY A SPECIFIC PROCEDURE, USING A MECHANICAL MECHANISM. THIS EXPANDS THE RUBBER ELEMENTS IN THE PACKER TO THE WELL CASING, PROVIDING A SEAL. PRESSURE IS CONTAINED BELOW THE PACKER. A HYDRAULIC BYPASS ALLOWS EQUALISATION OF THE PRESSURE ACROSS THE ELEMENTS BEFORE PULLING IT LOOSE AFTER A JOB.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 8484 FOR GASKETS AND SIMILAR JOINTS OF METAL SHEETING COMBINED WITH OTHER MATERIAL OR OF TWO OR MORE LAYERS OF METAL; SETS OR ASSORTMENTS OF GASKETS AND SIMILAR JOINTS, DISSIMILAR IN COMPOSITION, PUT UP IN POUCHES, ENVELOPES OR SIMILAR PACKINGS; MECHANICAL SEALS GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 8484 20 FOR MECHANICAL SEALS ALSO CLASSIFIED IN ACCORDANCE WITH: HARMONISED SYSTEM EXPLANATORY NOTE (C) TO HEADING 8484