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ข้อมูลสัญลักษณ์จำแนกการออกแบบผลิตภัณฑ์ระหว่างประเทศ

รหัส / code คำอธิบาย / code name Version
E21B0036000000 Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (drilling by use of heat E21B0007140000; secondary recovery methods using heat E21B0043240000) 1
E21B0036020000 using burners 1
E21B0036040000 using electrical heaters 1
E21B0037000000 Methods or apparatus for cleaning boreholes or wells (E21B0021000000 takes precedence;cleaning pipes in general B08B0009020000) 1
E21B0037020000 Scrapers specially adapted therefor 1
E21B0037040000 operated by fluid pressure, e.g. free-piston scrapers (operating other tools by fluid pressure E21B0023080000) 1
E21B0037060000 using chemical means for preventing or limiting the deposition of paraffins or like substances (chemical compositions therefor C09K0008520000) 1
E21B0037080000 cleaning in situ of down-hole filters, screens, or gravel packs(E21B0037060000 takes precedence);; 1
E21B0037100000 Well swabs 1
E21B0040000000 Tubing catchers, automatically arresting the fall of oil-well tubing 1
E21B0041000000 Equipment or details not covered by groups ; E21B0015000000-E21B0040000000 1
E21B0041020000 in situ inhibition of corrosion in boreholes or wells(dump bailers E21B0027020000; chemical compositions therefor C09K0008540000; inhibiting corrosion in general C23F) 1
E21B0041040000 Manipulators for underwater operations, e.g. temporarily connected to well heads (manipulators in general B25J) 1
E21B0041060000 Work chambers for underwater operations, e.g. temporarily connected to well heads (in general B63C0011000000) 1
E21B0041080000 Underwater guide bases, e.g. drilling templates; Levelling thereof 1
จำนวนรหัสข้อมูล 15 จาก 73902