A Method of Controlling the Accumulation of Fragmented Ice in the Wellhead Area of Jacket Platform Using Underwater Jet Airflow
A technology for controlling ducts and jet air flow, applied in the field of marine engineering, can solve the problems that have not yet occurred, and achieve the effect of reducing the scale of formation and inhibiting the accumulation process
Active Publication Date: 2018-08-24
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
However, in the existing control measures for the accumulation of crushed ice in the wellhead area of the jacket platform, there is no method that can achieve this key goal
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[0015] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0016] A method for controlling the accumulation of crushed ice in the wellhead area of a jacket platform by using an underwater jet airflow. The vertically upward coherent high-pressure airflow is used to separate the central part of the wellhead area and the separation area from the geometric center of the wellhead area at a preset elevation below sea level. The inside of the water jacket array is close to the four corners, the area where the ice breaking cone and the water jacket array intersect, and the key accumulation area of crushed ice is sprayed at points, and the coherent high-pressure airflow is made in the entire elevation of the corresponding injection area It produces gas explosion effect and gas-water two-phase turbulent flo...
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The invention discloses a method for controlling broken ice accumulation at a jacket platform wellhead area by adopting underwater jet stream. The method comprises the following steps of respectively carrying out point injection on a wellhead area middle part deviating from the geometric center of the wellhead area, positions, close to four angular points, of the inner side of a waterproof sleeve array, an area at which an ice breaking cone and the waterproof sleeve array are crossed and a broken ice key accumulation area by adopting vertically upward continuous high-pressure airflow at a preset elevation below the sea level; and enabling the continuous high-pressure airflow to generate a gas explosion effect and a gas-water two-phase turbulence effect within the whole elevation of the corresponding jetted area, wherein at a free water surface, blasting energy and influence range for pushing broken ice blocks to withdraw to a far end are provided. According to the method, basic conditions, on which a broken ice accumulating process at the wellhead area depends, can be directly broken, so that a water accumulating process for broken ice blocks loses a quick development source base. For a jacket platform at a shallow-water heavy ice area in China, prevention and control over floating ice accumulation in front of the wellhead area are carried out.
Description
technical field [0001] The invention belongs to the technical field of marine engineering and relates to a control method for preventing drift ice from accumulating in the wellhead area of a jacket platform. Background technique [0002] In the global ocean, sea ice covers an area of 37.7 million square kilometers, accounting for 11.8% of the global ocean surface. If the sea area where icebergs are distributed is added, the area of sea ice including drift ice is 72.6 million square kilometers, accounting for 22.9% of the global ocean surface. It can be seen that sea ice occupies an important position in the ocean. And it is in these sea areas covered by sea ice for a long or short period of time that there are abundant marine resources, which has led to the rapid growth of economic activities in cold sea areas in the past three decades. Among them, the development of offshore oil and gas resources, the utilization of marine renewable energy, and shipping activities a...
Claims
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IPC IPC(8): E02B17/00E02B1/00
CPCE02B1/003E02B17/0021
Inventor 万军黄焱郝宝齐张晓董坤杜夏英张伟倪先锋周晓艳桑军陈文峰赵希宝肖辉胡伟李翔云
Owner CHINA NAT OFFSHORE OIL CORP