Riser Stub for Acoustic Resonance Decomposition of Hydrate in Deepwater Drilling

• US 20200080386A1
• Filed: 06/10/2019
• Published: 03/12/2020
• Est. Priority Date: 09/10/2018
• Status: Active Grant

• Current Assignee: China University of Petroleum-Beijing (China University of Petroleum)
• Original Assignee: China University of Petroleum
• Inventors: Yang, Jin, Yin, Qishuai, Shi, Shanshan, Gu, Chunwei, Chen, Haodong, Liu, Hexing
• Granted Patent: US 10,641,049 B2
• Time in Patent Office: Days
• CPC Class Codes: E21B 17/01 Risers
• CPC Class Codes: E21B 2200/09 Detecting, eliminating, preventing liquid slugs in production pipes
• CPC Class Codes: E21B 28/00 Vibration generating arrangements for boreholes or wells, e.g. for stimulating production for fishing for or freeing objects E21B31/005; for transmitting measuring-signals E21B47/14; for geophysical measurements G01V1/02
• CPC Class Codes: E21B 33/038 Connectors used on well heads, e.g. for connecting blow-out preventer and riser
• CPC Class Codes: E21B 37/00 Methods or apparatus for cleaning boreholes or wells E21B21/00 takes precedence

Abstract

A riser stub for acoustic resonance decomposition of hydrate in deepwater drilling, comprising a through tubular stub body, a plurality of acoustic transducers being fixedly disposed on an outer wall surface of the tubular stub body; an outer side of the tubular stub body being covered with a water insulation layer, the plurality of acoustic transducers being sealed between the tubular stub body and the water insulation layer, the water insulation layer being further provided with a power-on interface that can be connected to a power supply, the plurality of acoustic transducers being connected to the power-on interface. A riser stub for acoustic resonance decomposition of hydrate in deepwater drilling, through continuous power-on, sound waves close to a simple harmonic vibration frequency of the hydrate are generated inside the pipeline to cause the hydrate in the riser to resonate, thereby being able to effectively avoid formation of hydrate inside the pipeline; after the hydrate is formed inside the pipeline, the acoustic transducers of the riser stub are energized, by means of the acoustic waves, the hydrate blocking the pipeline is caused to resonate to break its equilibrium state and to be decomposed so as to realize de-blocking.

Claims

1. A riser stub for acoustic resonance decomposition of hydrate in deepwater drilling, characterized in comprising a through tubular stub body,

wherein the through tubular stub body includes a first and second connection ends connected to a riser at both ends thereof, respectively;

wherein a plurality of acoustic transducers are fixedly disposed on an outer wall surface of the through tubular stub body;

wherein an outer side of the through tubular stub body is covered with a water insulation layer, and the plurality of acoustic transducers are sealed between the through tubular stub body and the water insulation layer; and

wherein the water insulation layer is further provided with a power-on interface that can be connected to a power supply, and the plurality of acoustic transducers are connected to the power-on interface.

2. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 1, wherein the acoustic transducers are provided in a plurality of groups at intervals along a length direction of the through tubular stub body, and

in each group, the acoustic transducers are evenly distributed along a circumferential direction of the through tubular stub body.

3. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 1, wherein the power supply is an external cable being placed downward from a water surface drilling platform.

4. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 1, wherein the power supply is a power supply system disposed outside the through tubular stub body.

5. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 4, wherein the power supply system includes a by-pass pipeline, one end of which is communicated with a first end inner cavity of the through tubular stub body, and an other end of which is communicated with a second end inner cavity of the tubular stub body;

wherein the one end and the other end of the by-pass pipeline are respectively provided with a first unidirectional gate valve, and an opening direction of the first unidirectional gate valve is that fluid flows from the other end of the by-pass pipeline to the one end thereof, the first unidirectional gate valve is provided with a first opening pressure; and

a sealed housing is arranged in the middle of the by-pass pipeline, and an impeller of a water-wheel power generation device is arranged within the sealed housing;

the water-wheel power generation device is connected to a power transmission interface, which is sealably connected to the power-on interface.

6. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 5, wherein a first branch line is connected in parallel to the one end of the by-pass pipeline, the first branch line is communicated with the first end inner cavity of the through tubular stub body;

a second branch line is connected in parallel to the other end of the by-pass pipeline, the second branch line is communicated with the second end inner cavity of the through tubular stub body; and

the first branch line and the second branch line are provided with a second unidirectional gate valve, respectively, and an opening direction of the second unidirectional gate valve is that fluid flows from the first branch line to the second branch line, the second unidirectional gate valve is provided with a second opening pressure.

7. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 5, wherein a first pipeline and a second pipeline are respectively disposed on opposite sides of the sealed housing corresponding to a circumferential direction of the impeller;

a free end of the first pipeline is a water inlet and is provided with a first threaded sealing cap;

a free end of the second pipeline is a water outlet and is provided with a second threaded sealing cap; and

square column-shaped operating levers facilitating an underwater robot to rotatablely open and close the threaded sealing caps are fixedly disposed on outer end faces of the first threaded sealing cap and the second threaded sealing cap, respectively.

8. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 7, wherein the first pipeline and the second pipeline are tapered pipelines that gradually expand to the free ends, respectively.

9. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 6, wherein a first pipeline and a second pipeline are respectively disposed on opposite sides of the sealed housing corresponding to a circumferential direction of the impeller;

a free end of the first pipeline is a water inlet and is provided with a first threaded sealing cap;

a free end of the second pipeline is a water outlet and is provided with a second threaded sealing cap; and

square column-shaped operating levers facilitating an underwater robot to rotatablely open and close the threaded sealing caps are fixedly disposed on outer end faces of the first threaded sealing cap and the second threaded sealing cap, respectively.

10. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 9, wherein the first pipeline and the second pipeline are tapered pipelines that gradually expand to the free ends, respectively.

11. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 1, wherein the water insulation layer is a ceramic insulation layer.

12. The riser stub for acoustic resonance decomposition of hydrate in deepwater drilling according to claim 1, wherein the first connection end and the second connection end are threaded connection ends or clamping connection ends, respectively.