Solid fluidization tubular separator for marine natural gas hydrate

Patent metadata

Field	Value
Publication number	US-11746640-B2
Application number	US-202217676250-A
Country	US
Kind code	B2
Filing date	Feb 21, 2022
Priority date	Apr 28, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

The disclosure discloses a solid fluidization tubular separator for marine natural gas hydrate, which includes a first separator and a second separator, wherein the first separator includes the first separation sleeve, the power liquid pipe, the swirl baffle, the recovery mechanism and the sand discharge mechanism. After the hydrate is sucked into the first separation sleeve to generate a circumferential velocity, so that the mud and sand with high density are separated to the pipe wall of the first separation sleeve, and the mud and sand separated to the pipe wall are settled down from the gap between the swirl baffle and the pipe wall along the pipe wall. The hydrate swirl flows into the recovery mechanism, and then leaves the first separation sleeve and enters the second separator, so as to realize the separation of mud and sand and natural gas hydrate.

First claim

What is claimed is:

1. A solid fluidization tubular separator for marine natural gas hydrate, comprising
a first separator, wherein the first separator comprises a first separation sleeve, a power liquid pipe, a swirl baffle, a recovery mechanism and a sand discharge mechanism;
the first separation sleeve is provided with a first suction inlet, the first suction inlet is arranged at a middle and upper part of the first separation sleeve, and the first suction inlet is a helical shape;
the power liquid pipe is arranged in the first separation sleeve, and an axis of the power liquid pipe coincides with an axis of the first separation sleeve;
the swirl baffle is arranged on an outer circumference of the power liquid pipe, and there is a gap between the swirl baffle and an inner wall of the first separation sleeve;
the recovery mechanism is arranged above the swirl baffle, the recovery mechanism comprises a recovery sleeve, the recovery sleeve is arranged on the power liquid pipe; a inner diameter of the recovery sleeve is greater than an outer diameter of the power liquid pipe, and an upper part of the recovery sleeve is connected with the first separation sleeve;
the gap between the recovery sleeve and the power liquid pipe forms a hydrate recovery channel;
the sand discharge mechanism is connected to a lower end of the first separation sleeve:
a second separator is further provided, wherein the second separator is connected to an upper end of the first separation sleeve, and the hydrate enters the second separator through the recovery mechanism.

2. The solid fluidization tubular separator for marine natural gas hydrate according to claim 1 , wherein the power liquid pipe comprises a first power liquid pipe, a second power liquid pipe and a third power liquid pipe, the first power liquid pipe and the third power liquid pipe are fixedly arranged, and the second power liquid pipe is rotationally connected with the first power liquid pipe and the third power liquid pipe respectively; the recovery sleeve is integrally arranged with the second power liquid pipe, the recovery sleeve is rotationally connected to the first separation sleeve, an interior of the second power liquid pipe is fixedly provided with a first helical blade, an outer pipe wall of the recovery sleeve is provided with a crushing reamer, and the first helical blade is driven by dynamic liquid to drive the second power liquid pipe to rotate, so as to drive the recovery sleeve to rotate.

3. The solid fluidization tubular separator for marine natural gas hydrate according to claim 2 , wherein an outer wall of the second power liquid pipe is provided with a second helical blade, and a rotation direction of the second helical blade is opposite to the first helical blade.

4. The solid fluidization tubular separator for marine natural gas hydrate according to claim 1 , wherein a lower end of the recovery sleeve is located between the first suction inlet and the swirl baffle.

5. The solid fluidization tubular separator for marine natural gas hydrate according to claim 1 , wherein the sand discharge mechanism comprises a sliding sleeve and a spring, the sliding sleeve is sleeved on the power liquid pipe, the spring is fixedly connected to the lower end of the sliding sleeve; the sand discharge mechanism is provided with a first sand discharge hole, and the sliding sleeve is moved downward by compressing the spring to communicate the first sand discharge hole with the first separation sleeve.

6. The solid fluidization tubular separator for marine natural gas hydrate according to claim 5 , wherein the first separator further comprises a flow stabilization baffle, and the flow stabilization baffle is arranged between the swirl baffle and the sand discharge mechanism.

7. The solid fluidization tubular separator for marine natural gas hydrate according to claim 6 , wherein the first separator further comprises a balance device, the balance device comprises a balance valve, and the balance valve is arranged between the flow stabilization baffle and the sand discharge mechanism.

8. The solid fluidization tubular separator for marine natural gas hydrate according to claim 1 , wherein the second separator comprises a first sleeve, a second sleeve and a second separation sleeve, the first sleeve is sleeved on the power liquid pipe, and the second sleeve is arranged between the power liquid pipe and the first sleeve; an upper end of the second sleeve is fixedly connected to the second separation sleeve, an lower end of the second separation sleeve is butted with the upper end of the first separation sleeve, an upper part of the first sleeve is provided with a second suction inlet, the second separator is provided with a second sand discharge hole, and the second sand discharge hole is arranged on the first sleeve.

9. The solid fluidization tubular separator for marine natural gas hydrate according to claim 8 , wherein the upper end of the first sleeve is a helical sleeve, and the second suction inlet is arranged on the helical sleeve.

10. The solid fluidization tubular separator for marine natural gas hydrate according to claim 8 , wherein a lower part of the first sleeve is conical.

Assignees

• Southern Marine Science And Eng Guangdong Laboratory Zhanjiang
• Univ Southwest Petroleum
• Southern Marine Science And Eng Guangdong

Inventors

• Tang Yang
• Li Zeliang
• Li Xushen
• Lu Jiang
• Fang Xiaoyu
• Wang Guorong
• Yang Pu
• Zhao Jinhai
• Ma Xiaolong
• Xia Dongqing
• Zhong Lin
• He Yufa
• Li Qingping
• Li Yanjun
• Liu Hexing
• Zhao Peng

Classifications

• E21B43/36 Primary

  Underwater separating arrangements (E21B43/38 takes precedence) · CPC title

• E21B43/01

  specially adapted for obtaining from underwater installations · CPC title

• E21B43/35

  specially adapted for separating solids (down-hole drilling fluid separation systems E21B21/002; separating solids from drilling fluids E21B21/065) · CPC title

• E21C50/00 Primary

  Obtaining minerals from underwater, not otherwise provided for (suction dredgers or component parts thereof E02F3/88; equipment for conveying or separating excavated material E02F7/00; dippers G01N1/12) · CPC title

• E21B41/0099

  specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates · CPC title