Yesterday, the Haiyang Shiyou 229 ship carrying Asia's first deepwater jacket "Haiji 2" sailed to the launching position. The five tugboats that assisted in the launching work completed various tasks such as towing cable connections. All construction workers have boarded the ship and are carrying out operations such as cutting the jacket and barge connection structure overnight. The ship's load adjustment work is also being carried out simultaneously. This morning, "Haiji No. 2" was launched for construction.
Reporter visit:
A closer look at the "Haiji-2" jacket
The "Haiji No. 2" jacket departed from Zhuhai, Guangdong, and just arrived in the construction sea area yesterday after more than 40 hours of long-distance towing. CCTV reporter Gu Junling rushed to the operation site as soon as possible and boarded Asia's largest marine engineering barge 229 to transport the "Haiji No. 2". Before the official construction, he could reveal the secrets of this "big country's important weapon" at sea at close range.
CCTV reporter Gu Junling: Boarding this Haiyang Oil 229 transport ship gave me the feeling that it is indeed the largest in Asia. We can see that this deck is very spacious and extremely long. Looking further into the middle, we can see the densely packed criss-crossing jackets. We feel like we are in a steel forest that blocks the sky and the sun. Its total weight reaches more than 37,000 tons.
I noticed that these pipes were not painted and even had a thin layer of rust on the surface. So in a high-salt, high-humidity environment like seawater, aren't you afraid of it being rusted? This is thanks to these white metallic zinc pieces on the catheter. Its oxidation activity is higher than iron, so in seawater, it must be oxidized first. It sacrifices itself to protect the iron metal jacket from being oxidized and rusted by seawater in the next 30 years of use.
In fact, when the entire jacket was first placed in the water, it was floating sideways on the water. So how do you straighten it, straighten it, and then place it on the bottom of the sea? Let's take a look at the entire jacket, especially the particularly thick iron pipes near the bottom of the jacket. It is actually hollow inside. In addition to playing a strong supporting role, it can also fill with water. Once it is filled with water, it will become heavier, and slowly it will sink. There will also be a crane on the top of the jacket to pull it. Slowly, it will become upright, straighten, and finally sit firmly on the seabed. .
What we see now is the bottom of the jacket. At its four corners, there are four sleeves with a diameter of nearly 3 meters. Does it look like the propeller at the bottom of a giant rocket? When the entire jacket is straightened vertically and dropped to the seabed, we have to drive piles down through these 16 sleeves to a depth of 170 meters under the seabed to ensure the stability of the entire drilling platform.
The height of the entire Big Mac jacket is 338 meters, and the sea depth here is 324 meters. In other words, when it is completely upright and falls on the sea bed, part of its top will be exposed to the sea. Next, we will build the entire offshore drilling platform based on this part of the jacket exposed to the sea.
Welding one body is not afraid of wind and waves
The solder joints are separated and can enter the sea smoothly
Before towing, "Haiji No. 2" is closely connected with the barge through a special design to form a whole. This design can ensure that "Haiji No. 2" remains stable even if it encounters strong winds and waves during towing.
"Haiji No. 2" is firmly welded with the Offshore Oil 229 barge through 34 strong steel pipes and 12 welded plates. Before the jacket is launched into the water, these 36 welding points will be cut and separated in sequence. Once these constraints disappear, "Haiji-2" will freely slide into the sea along the laid track under its own gravity.
CCTV reporter Gu Junling: We can see that these are the two sliding tracks that run through the bow and stern of the entire transport ship, and the entire jacket is located on these two tracks. This track is coated with Teflon coating, the kind used in non-stick pans at home, which can reduce friction and can withstand high temperatures. This allows the entire 300-meter-long jacket to slide safely and smoothly into the water in just a minute or so.
Wang Dongmian, deputy captain of the Haiyang Petroleum 229 transport ship: There is another world below our deck, including the engine room, centralized control room, auxiliary engine room, and management and accompanying cabins. Through the joint management and control of these cabins and coordinated operations, our ship can not only carry the giant cauldron, but also Thread needle embroidery. Our ship drains the water from the bow water tank to raise the bow, and the water pressure in the stern water tank presses the stern down, forming an angle of 4 degrees, so that the jacket follows this slope smoothly. Slide into the water. (CCTV News Client)