Page 69 - Wire Rope News & Sling Technology - October2019
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INVENTOR’S CORNER
                                                              System for hoisting a load on a drilling rig
                                                              Pat. 10,378,290  U.S. class 1/1  Int. class E21B 15/02
                                                              Inventor: Yngvar Boroy, Sogne, NO., Anders Eriksson, Forne-
                                                              bu, NO., Thor Strand, Kristiansand, NO., Anibal B. Teixeira.
                                                              Assignee: National Oilwell Varco Norway AS., NO.
                                                               A system for hoisting a load on a drilling rig includes: a
                                                              hoisting means having an elongated hoisting member and
                                                              an elongated hoisting member drive means; a drill string ro-
                                                              tation means suspended from an end of the elongated hoist-
                                                              ing member; a support structure having a first side and a
                                                              second side and being adapted to support at least a portion
                                                              of the weight the drill string rotation means; a first elongat-
                                                              ed hoisting member guiding means connected to the support
                                                              structure; and a counterweight connected to the elongated
                                                              hoisting member at the second side of the support structure.
                                                              The elongated hoisting member is reeved over the first elon-
                                                              gated hoisting member guiding means from the first to the
                                                              second side of the support structure. The drill string rotation
                                                              means is suspended from the elongated hoisting member at
                                                              the first side of the support structure.
                                                               Figure 25 shows hoisting system 1 that includes an elon-
                                                              gated hoisting member 3, in the form of a wire rope, and an
                                                              elongated hoisting  member drive  means  5,  in  the  form  of
                                                              a single-layer winch, is connected to a drill string rotation
                                                              means 7, in the form of a top drive, at the end of the wire
                                                              rope 3. The wire rope 3 is suspended from a support struc-
                                                              ture 9 in the form of a derrick. At the top of the derrick 9 is
                                                              provided a first elongated hoisting member guiding means
                                                              11 in the form of a crown block. The crown block 11 is con-
                                                              nected to the derrick 9 via a heave compensator 13 providing
                                                              the necessary redundancy in case of a winch 5 failure.
                                                               A first portion 31 of wire rope 3 extends directly from the
                                                              top drive 7 at a first side 91 of the derrick, over the crown
                                                              block 11 and to a counterweight 15 in the form of a travel-
                                                              ling block at a second side 93 of the derrick 9, the crown
                                                              block 11 constituting a division between the first side 91 and
         Figure 23: Front view of the example connecting and anchoring
         device.                                              the second side  93 of the derrick  9 in the shown  embodi-
                                                              ment. A second portion 33 of the wire rope 3 extends from
         protection and rescue systems. In an example operation, the   the travelling block 15 and to the single-layer winch 5, both
         connecting and anchoring device 10 may be attached to a                               continued on next page
         lanyard or other piece of material (e.g., sewn into the lan-
         yard) during the production phase or by a rated connector to
         retro fit an existing lanyard. In another example operation,
         the connecting and anchoring device 10 may connect a shock
         absorbing  lanyard or  retractable  device from  a climber’s











         Figure 24: Top view of the example connecting and anchoring device.


         harness to an anchor point. Other operations are also con-
         templated, such as but not limited to rope access for rock
         climbing or structure climbing. Referring to figures 21 and
         23, the arms 12 and 14 define a connecting apertur “AP1” of
         the device 10; the device has a base element 35 and a fixed
         hook 33; the double action snap hook 32 has a hook portion
         32a and a latching portion 32b; the hook portion 32a of the
         snap hook 32, in combination with the fixed hook 33, defines
         a void aperture 36; and the loop 28 of the cable 22 defines an
         aperture 28a therethrough.
                                                              Figure 25: Schematic side view of a hoisting device.
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