SELF-ELEVATING DRILLING RIG FOR SHALLOW WATER AREA OPERATION WITH SEASON ICE COVER Russian patent published in 2018 - IPC E02B17/02 E02B15/02 B63B35/44 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to mobile offshore drilling rigs and can be used to construct oil and gas wells in shallow water areas with seasonal ice cover. According to the invention, the portion of the ice deflector is made with some reinforcement in the center of the body, forming a slightly inclined surface to the periphery of the housing, three radial channels, evenly directed from the center of the hull with a circle of 3–5 m to the peripheral part of the hull, and is additionally provided with a number of metal pyramids, the bases of which are rigidly fixed on the slightly inclined surface of the ice deflector, and the sharp peaks of the pyramids are directed downward toward the ice surface. And in the center of the thickened section of the ice deflector is rigidly fixed by its base a metal pyramid, whose height is 1.5–3 times higher than the height of the rest of the pyramids. In this case, the radial channels do not contain a plurality of pyramids fixed rigidly by their lower base to a slightly inclined surface of the ice deflector portion. Width of the radial channels is from 1 to 3 m, and their depth varies from 0.2 to 0.5 m. Angle of inclination of the ice deflector from the center to the peripheral part of the body can vary from 5° up to 8°, which ensures the orderly extrusion of the destroyed ice from under the hull of the self-elevating drilling rig beyond its limits into the sea area. In addition, on the deck of the self-elevating drilling rig is additionally installed a steam generator equipped with thermally insulated pipelines terminating in the outlet nipples, installed at each vertical support of a self-elevating drilling rig in the underwater part of the sea at a depth of 0.4 to 1.0 m with the possibility of changing the depth of immersion of the fittings and their location along the height of vertical supports.

EFFECT: technical result is increased reliability and durability of the floating hull.

4 cl, 3 dwg