In the video, the narrator discusses two concepts that we have not gone over yet, a Riser and a Moon Pool. I selected this video clip because it ties together a lot of the concepts that we have discussed in this and past lessons it shows the interior of the rig and it discusses many of the rig specifications considered in the design (remember, you as a drilling engineer will need to coordinate with the drilling company for the proper rig specifications when contracting a rig). This is a promotional video, so you may need to overlook its commercial nature. The drilling rig shown in this animation is the Maersk Developer rig, a very modern rig (Note: rigs like this one do exist – this is not a “rig-of-the-future” video.). I have included a video below, Maersk Drilling - Ultra deepwater semi-submersible rig - Maersk Developer (17:48), showing an animation of a semi-submersible drilling rig. Semi-submersible drilling rigs are capable of drilling wells to a TD (total depth) of 30,000 – 35,000 ft. Due to their stability, semi-submersible rigs are also preferred in harsh offshore environments. The current world record water depth for a semi-submersible rig using dynamic positioning is 9,472 ft. Semi-submersible rigs are used to drill wells in water depths up to 9,500 ft. Semi-submersible drilling rigs are considered to be the most stable of the deeper water MODUs. The thrusters are the yellow devices under the pontoons in Figure 8.12. In addition, a system of Thrusters (high energy propellers) is used to control the pitch, roll, and yaw of the vessel and to provide Dynamic Positioning to keep the rig at the same surface location during drilling operations. The columns provide additional stability to the vessel during drilling operations due to their small cross-sectional area as little wind, wave, or tidal energies are imparted to the columns and the vessel (this is called Wave Transparency). This is done to create greater stability during drilling operations by adding mass to the vessel and providing it with a deeper draft. Once on location, water is used as ballast to partially flood the pontoons and columns to allow them to sink to a position below the water level. The self-propelled vessel, one of the largest of its kind, can accommodate 725 persons on board and can assist with hook-up and commissioning as well as initial platform life support activities.Source: LinkedIn Slideshare - Semi submersibleĭuring transport (either self-propelled or towed), the pontoons allow the vessel to float in the water until it is on location. The Saipem 7000 semi-submersible crane vessel has the capacity to handle the entire workscope of offshore construction developments, encompassing pipelaying in water depths greater than 6,500 feet and heavy lift operations up to 14,000 tons. The vessel left the offshore wind farm site on Wednesday for scheduled maintenance with a plan to return later this month. The vessel was being used for the transport and installation of jacket foundations at the 1,075 MW Seagreen offshore wind farm in Scotland, owned by SSE Renewables and TotalEnergies. The Saipem 7000 tilted only a day after it left the Seagreen offshore wind farm. They also noted that a lot of public resources were put on standby.Įyewitnesses also told VG that it appears as if the Saipem 7000 is sinking as some parts are getting closer to the water. This probably means that there is some wreckage floating in the fjord.Īccording to the Southern Norway rescue center, barges next to crane vessels inflicted major damage and are capsized. Rescue leader in the Joint Rescue Coordination Centre for Southern Norway Owe Frøland said that he was in contact with the Saipem 7000 crane vessel crew and that they informed him that some of the lifting equipment on the crane ship failed, which led to them being tilted. 275 ppl on board #Stavanger #Åmøyfjorden #Norway #Saipem7000 #MaritimeSecurity /dM8LePv8Dd One of the biggest Crane vessels in the world, tilting after a sudden explosion 20 min's ago. Local police said that no one was injured or missing in the incident and that an investigation is underway to see if there has been pollution in the sea as a result of the accident. VG further claimed that there were 275 people on board but that they were all accounted for. The accident occurred during a lift in the morning hours. Saipem 7000, Saipem's giant semi-submersible crane vessel, has tilted in a fjord in Norway with 275 people aboard.Īccording to the Norwegian news outlet VG citing eyewitness statements, ‘loud bangs’ were heard before the vessel started to tilt in Åmøyfjorden outside Stavanger, a hub of Norway's offshore oil industry.
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