METHOD TO DEVELOP FLOATING SEMISUBMERSIBLE DRILLING SHIP AND ITS DESIGN Russian patent published in 2014 - IPC E21B7/128 

FIELD: electricity.

SUBSTANCE: device for shelf drilling comprises a ship, a support platform, a system to lower and raise a drilling tool, a power plant in the form of a diesel power generator. All drilling equipment is located on a trimaran, in the main body of which there is a stern hydraulically insulated compartment with the main complex of drilling equipment and is a drill tower with a system of lowing-raising mechanisms to make a connection to a drill string and casing pipes. Additional and auxiliary equipment is installed on floats-outriggers. A power plant in the form of a diesel power generator with accumulators, a living complex, a control panel, some properties are installed in a hydraulically insulated deckhouse rigidly fixed on telescopic axles, their external ends are rigidly fixed and fastened on each outrigger of the trimaran, and each axle stretches via a hinged joint with each board of the main body, and around the upper part of the drilling compartment there are removable brackets with guides and fixing rollers, to which from outriggers from both sides two composite parts are fed and moved onto brackets, to form circular decks, after their fixation to each other and with the help of double-drum hoists evenly installed on the deck with paired ropes, steel ropes or chains connected to anchors, the ship is fixed on the sea bottom above the wellhead. To reduce impact of sea waves and currents at the drilling plant, there are azimuthal screw thrusters in closing niches with electric motors, which rotate the main body inside the fixed anchored deck frame, orienting the keel against the current.

EFFECT: performance of work under varying climatic conditions.

4 cl, 4 dwg