China's first self-developed dynamic positioning system passed the acceptance
On August 6th, the "Offshore Oil 299" cable-laying ship used the HDP3 system to carry out the dynamic positioning function offshore test. The sea trial demonstrated the main functions of the system to the expert group and verified the reliability and accuracy of its positioning. After the sea trial, experts from the Ministry of Industry and Information Technology, the Ministry of Transport, the State Oceanic Administration and China State Shipbuilding Corporation and other experts conducted discussions and put forward opinions on the extension of the project and the next industrialization.
It is understood that the development project of the dynamic positioning system HDP3 was initiated by the Ministry of Industry and Information Technology and jointly developed by the China Shipbuilding Industry Corporation No. 708 Research Institute and China National Offshore Oil Engineering Co., Ltd. and Harbin Engineering University. After four years of research and development, since July 6 this year, the HDP3 engineering prototype began to be commissioned and tested on the "Offshore Oil 299" cable-laying ship. In the meantime, the system carried out tests such as fixed-point positioning, fixed-point rotation, high-low-speed tracking, fixed-length, fixed-horizontal, and orientation functions, and the indicators met the requirements of actual engineering operations. On August 2, under the sea conditions with wind speed of 6~9 and current velocity greater than 1 knot, HDP3 system achieved the goal of average ship position deviation less than 1 m and average heading deviation less than 1 degree. The technical indicators specified in the development task book have passed the inspection of China Classification Society.
The ship dynamic positioning system refers to a system device that uses a motive power propulsion device to maintain a certain position and angle of the ship or move according to a predetermined trajectory without the use of a mooring system in the presence of wind, waves or current disturbances. It mainly includes position measurement system, control system, thrust system, etc. It is suitable for multi-purpose engineering vessels, offshore vessels, offshore oil platforms, etc. At present, only Norway, Finland, France, the United States and other countries have relevant research and development manufacturing technology, and Kangsbo, the United States and other companies monopolize the global ship dynamic positioning system market. The annual market size of China's ship dynamic positioning system is about 2 billion yuan, and the potential demand is 200 sets. It has long been monopolized by foreign companies. The successful development of the HDP3 dynamic positioning system will break the monopoly of foreign countries and add important tools for building a strong ocean in China.
Ultrasonic Drilling Rig For Geological Survey Investigation
Sonic drilling is a soil penetration technique that strongly reduces friction on the drill string and drill bit due to liquefaction, inertia effects and temporary reduction of porosity of the soil. The combination makes penetrating for a large range of soils easy for our Sonic rigs and tooling. The penetration rates in most bedrock are faster with this technology also.
At first glance, a SONIC drilling rig looks very much like a conventional air or mud rotary drill rig. The biggest difference is in the drill head, which is slightly larger than a standard rotary head. The head contains the mechanism necessary for rotary motion, as well as an oscillator, which causes a high frequency force to be superimposed on the drill string. The drill bit is physically vibrating up and down in addition to being pushed down and rotated. These three combined forces allow drilling -to proceed rapidly through most geological formations including most types of rock.
In overburden, the vibratory action causes the surrounding soil particles to fluidize, thereby allowing effortless penetration. In rock, the drill bit causes fractures at the rock face, creating rock dust and small rock particles, which facilitates advancement of the drill bit. In many instances the drilling and coring of rock and earth can be accomplished without the use of any drilling fluid whatsoever. This is an important requirement for environmental drilling projects. Compressed air, drill mud, or plain water can be utilized to remove the cuttings and speed up the operation further, depending on the application that the machine is used for.
The oscillator is driven by a hydraulic motor and uses out of balance weights to generate high sinusoidal forces that are transmitted to the drill bit. An air spring is also incorporated in order to confine the alternating forces to the drill string. The frequency can be varied to suit operation conditions and is generally between 50 and 160 hertz (cycles per second). As a comparison, ordinary household current in many countries alternates at 60 hertz. This frequency range falls within the lower range of sound vibrations that the human ear is capable of hearing.
While the principle behind the SONIC drill rig appears complicated, the machine is actually very simple to operate. The driller only adds vibratory energy to the normal rotary motion. He simply chooses a frequency that gives him the best drilling rate or best core recovery, as the case may be.
Ultrasonic Drilling Rig for Geological Survey Investigation,Geological Ultrasonic Drilling Rig
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