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Submarine shallow-layer non-diagenetic natural gas hydrate lifting method and system

A hydrate and non-diagenetic technology, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc., can solve the problems of lack of relatively perfect methods and devices, and achieve the effects of compact structure, stable operation, and downhole space saving

Active Publication Date: 2018-05-18
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the collection of mixed slurry, the separation of hydrate particles and sand particles, and the lifting of hydrate slurry after solid fluidization of shallow hydrate, there is currently no relatively complete method and device

Method used

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  • Submarine shallow-layer non-diagenetic natural gas hydrate lifting method and system
  • Submarine shallow-layer non-diagenetic natural gas hydrate lifting method and system
  • Submarine shallow-layer non-diagenetic natural gas hydrate lifting method and system

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0020] The subsea shallow non-diagenetic natural gas hydrate lifting method described in the examples of the present invention mainly includes the following steps (such as figure 1 shown):

[0021] Step 1: lower the water-resisting conduit 5, and use the drill bit 24 to drill the pilot hole. When the drill bit 24 reaches the working depth, the drill bit 24 stops drilling;

[0022] Step 2: Start the pressure pump 2 on the offshore platform 3 to deliver seawater to the annular space of the double-layer pipe 4, and the seawater in the annular space enters the screw motor 10 through the upper bridge channel 7 to change the flow path;

[0023] Step 3: seawater drives the rotor 9 of the screw motor 10 to rotate in the stator 8, squeezes the seawater into the lower bridge channel 18, and then changes the f...

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Abstract

The invention discloses a submarine shallow-layer non-diagenetic natural gas hydrate lifting method and a system, which are used for lifting submarine shallow-layer non-diagenetic natural gas hydrate.A pilot hole is drilled by a drill bit, a pressure pump is started after a predetermined position is reached, high-pressure seawater drives a screw motor to rotate, and torque and rotational speed are transmitted to a screw pump by a cardan shaft; jet breaking is started by nozzles, hydrate is collected, secondarily broken and separated by collecting inlets, a secondary breaking device and a separator, separated sand is backfilled, and hydrate slurry is lifted to a solid control system on an offshore platform by the screw pump to undergo post-treatment. The invention has the following advantages: the whole process is simple, and submarine shallow-layer non-diagenetic hydrate can be effectively broken, separated and lifted; the screw pump device has the characteristics of compact structure, small size, high self-sucking capability, stable operation and long service life; and an upper bridge type passage and a lower bridge type passage ingeniously realize the pumping and lifting of seawater and hydrate slurry and save underground space.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a method and device for lifting non-diagenetic natural gas hydrate in the shallow seabed. Background technique [0002] Natural gas hydrate, also known as "combustible ice", is a "cage compound" formed by methane-based hydrocarbon gas and water under certain temperature and pressure conditions, and has a white crystalline structure. Natural gas hydrate, especially marine hydrate, is a new energy source with the largest untapped reserves at present, and its reserves are equivalent to twice the world's known energy reserves of coal, oil and natural gas. However, to achieve effective and controllable hydrate Commercial mining is a difficult problem facing the world at present. [0003] The main existence forms of hydrates are sandstone type, sandstone fracture type, fine-grained fracture type and dispersed type, among which fine-grained fractured and disper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00
CPCE21B43/121
Inventor 王国荣王党飞周守为钟林刘清友魏刚邱顺佐付强李清平
Owner SOUTHWEST PETROLEUM UNIV
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