Electromagnetic heating device and method for submarine combustible ice mining
An electromagnetic heating device and electromagnetic heater technology are applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., and can solve problems such as the influence of electric pump working performance.
Pending Publication Date: 2019-04-16
安徽物迅科技有限公司 +1
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Problems solved by technology
[0008] The invention aims to solve the problem that secondary hydrates are formed again due to the pressure rise after the seabed natural gas (combustible ice) hydrate enters the wellbore during the mining process of the seabed combustible ice layer (19) by the depressurization method
At the same time, it avoids the problem that the traditional bottom-hole electric heating technology is likely to cause the gasification of combustible ice and form free gas, which will affect the working performance of the electric pump (17).
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[0023] The electromagnetic heating device and method for seabed combustible ice mining of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] Such as Figure 1~2 As shown, the structural composition of the electromagnetic heating device for seabed combustible ice mining is fully described, including oil pipe coupling (1), heating base pipe (2), shield (4), floating support (3), shield (4), Heating wire reel (10), cable socket (5), electromagnetic heater head (6), eccentric oil pipe threaded joint (7), perfusion epoxy glue (8), bottom heat insulation asbestos (9), heating wire reel ( 10), top protection asbestos (11). During specific installation, the head of the electromagnetic heater (6) is connected to the heating base pipe (2) through the oil pipe thread, and then a layer of bottom heat insulating asbestos (9) is coated on the surface of the heating base pipe (2), and then the heat...
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The invention provides an electromagnetic heating device and method for submarine combustible ice mining and belongs to the technical field of submarine natural gas (combustible ice) mining. When a pressure reduction method is adopted and after combustible seabed ice becomes into liquid and enters a shaft, the combustible ice forms a secondary hydrate again and is suitable for mining by an electric pump as the pressure increases. For supplementing heat, a precise temperature control device needs to be installed at the inlet end of a submersible electric pump. By utilizing the current skin effect principle, an electromagnetic heating device having a certain length is installed at the inlet end of the pump, so that a base tube generates heat to directly heat the hydrate flowing through the base tube. Its function is to always keep the combustible ice in a liquid state and prevent the gasification of combustible ice or production of the secondary hydrate from affecting the working performance of the electric pump. Compared with the heating way of a traditional hollow rod and the heating way of a heat tracing cable, the heat conversion efficiency of electromagnetic heating can reach 95% or above, a heating section is controllable in length and installation position, and the good practical shaft bottom heating tool and method are provided for energy-saving mining of seabed combustible ice, improvement of gas production rate, increase of economic benefits and the like.
Description
technical field [0001] The invention belongs to the technical field of seabed natural gas (combustible ice) exploitation, and in particular relates to a device and method for exploiting seabed natural gas (combustible ice) by means of electromagnetic heating, which is applicable to the mining of seabed natural gas (combustible ice) hydrate to prevent secondary Secondary hydrate formation, tools and methods to facilitate the lifting of natural gas (combustible ice) hydrate to the wellhead through electric pumps. Background technique [0002] With the continuous exploitation of petroleum resources and coal resources, traditional mineral energy sources are constantly being depleted. my country's vast sea area and rich seabed natural gas (combustible ice) resources provide a broad development prospect for my country to solve the shortage of traditional energy. The energy of combustible ice is clean, and its emissions are only water and carbon dioxide. All developed countries in...
Claims
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IPC IPC(8): E21B43/01E21B43/24
CPCE21B43/01E21B43/2401E21B41/0099
Inventor 徐涛杨胡坤王海洪
Owner 安徽物迅科技有限公司