Deep sea natural gas hydrate marine-riser-free exploration system and method
An exploration system and natural gas technology, applied in the field of deep-sea natural gas hydrate drilling and exploration, can solve the problems of slow production of natural gas hydrate, stop of production, etc., to eliminate the risk of refreezing, simplify well and casing procedures, technical and economic effects significant effect
Pending Publication Date: 2020-05-26
派格水下技术(广州)有限公司
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Problems solved by technology
The electric submersible pump needs a minimum flow rate to maintain the decompression process. When the production of gas hydrate is slow due to a series of reasons, the decompression will no longer be maintained and the production will stop.
[0004] Currently, there is no commercially proven method for extracting natural gas from seafloor hydrates, and in order to explore and extract natural gas from gas hydrate deposits, new methods must be introduced to provide a safe and reliable system
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[0113] The present disclosure provides a deep-sea gas hydrate riserless exploration system operated from a floating drilling platform or a drillship that enables permanent reduction of pressure deep inside gas hydrate deposits. The system includes a riserless gas hydrate blowout preventer, a deep-sea gas hydrate separator and a pump unit. The system does not use a marine riser, and the drillpipe is drilled directly through the open water body. The system reduces the pressure of natural gas hydrate by lowering the liquid level of the gas production pipeline, so that the pressure in the gas production pipeline is lower than the surrounding seawater pressure. Gas and water, and begin to flow to the production system.
[0114] Since the decompression of the traditional electric submersible pump requires a minimum flow rate for the hydrate, that is, there needs to be enough liquid in the hydrate deposit, and when the liquid is insufficient, the decompression cannot be sustained. ...
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The invention provides a deep sea natural gas hydrate marine-riser-free exploration system. The deep sea natural gas hydrate marine-riser-free exploration system comprises a drilling platform (11), amarine-riser-free natural gas hydrate blowout preventer (5) connected to a natural gas hydrate well, a submersible pump module (3) installed and connected to a natural gas hydrate drilling template (17), a natural gas hydrate separator (4) connected to the marine-riser-free natural gas hydrate blowout preventer (5) and the submersible pump module (3), wherein a drill rod (15) directly penetrates through open water to conduct drilling. By using the system, it is ensured that natural gas hydrate is at constant low pressure, the production stability has nothing to do with the low pressure and theyield, and shallow underground burial hydrate can be safely, reliably, economically and continuously produced.
Description
technical field [0001] The present disclosure relates to the field of deep sea gas hydrate drilling and exploration, in particular to exploration drilling, testing and production of deep sea gas hydrate deposits. Background technique [0002] Gas hydrates are deposited under the shallow surface of the seabed, and the formation pressure gradient where the deposits are located is similar or the same as that of seawater. Due to the short distance between the top of gas hydrate deposits and the seabed, conventional drilling and production techniques are not compatible with existing safety and integrity measures. [0003] On the other hand, the gas hydrate decompression process is usually performed by inserting an electric submersible pump into the gas hydrate wellbore to reduce the pressure of the gas hydrate deposits. The electric submersible pump needs a minimum flow rate to maintain the decompression process. When the production of gas hydrate is slow due to a series of reas...
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IPC IPC(8): E21B43/01E21B21/08E21B21/10
CPCE21B21/001E21B21/08E21B21/106E21B43/01
Inventor 斯迈·格莱迪奇沈越
Owner 派格水下技术(广州)有限公司