FIELD: gas production industry.
SUBSTANCE: invention relates to the development of deep-sea offshore fields of liquefied natural gas (LNG), in particular, during the development of the Arctic Shtokman gas condensate field, by means of bonded workshops with stationary cameras, with the possibility of withdrawal of an LNG plant, dissected into workshops, and installation of workshops on a trestle platform at the depth of 300 meters or more. Sealed assembly units with chambers are transported by means of an underwater tanker or barge, suspended on ropes, wound on drums of self-braking winches installed on the outside of the tanker hull. Plant (workshop) can be raised to the water surface if necessary, for example, for changing personnel and replacing chemical process equipment (CPE), using the tanker winches, and the tanker is brought to the location of the trestle platform by means of the dynamic positioning system, as well as the automated installation system of the LNG production workshop on the bottom platform, installed on the seabed near a natural gas production site of a modular design; including a system of hydroacoustic emitters, receivers, propulsion systems, control systems and precise fixation of the LNG plant (workshop) on the bottom platform. Created a creative assembly unit consisting of connected sealed workshop and chamber, with the difference in buoyancy and weight of this assembly placed in the water, it is very different when filled with gaseous nitrogen or seawater.
EFFECT: in the first case, when the chamber of the assembly unit is filled with nitrogen, the tension of the winch rope, weight of the rope, winch drive torque, displacement and cost of the transporting underwater tanker decrease, equipment and plant personnel are repaired, CPE repair of an LNG plant; in the second case, the assembly unit will press with greater force on the platform and no bolting is required to prevent the assembly unit from moving relatively to the pile platform of the trestle, formed on the sea ground, including 100 m depth on the horizon, with the flow of 1–4 cm/s.
15 cl, 7 dwg
