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Deep water riser emergency suspension string system and method

A deepwater riser and riser technology, which is applied in the field of drilling, can solve the problem that the conventional riser cannot be suspended, and achieves the effect of meeting the needs of soft suspension and avoiding deflection.

Active Publication Date: 2020-09-22
GUANGZHOU MARINE GEOLOGICAL SURVEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a deepwater riser emergency suspension string system, which can solve the problem that the conventional riser cannot be suspended quickly and reliably when the drilling platform encounters bad weather
[0005] The second object of the present invention is to provide a deep water riser emergency suspension pipe string method, which can solve the problem that the conventional riser cannot be suspended quickly and reliably when the drilling platform encounters bad weather

Method used

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  • Deep water riser emergency suspension string system and method
  • Deep water riser emergency suspension string system and method

Examples

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Effect test

Embodiment 1

[0042] Such as Figure 1-2 As shown, a deepwater riser emergency suspension string system includes a conventional riser 1, a feed-in riser 2, a flexible joint 3, a Christmas tree block 4, a top drive 5 and a controller. The upper part of the inlet riser 2 is connected, the lower part of the inlet riser 2 is connected with the conventional riser 1 through a flexible joint 3, and the Christmas tree block 4 is embedded in the periphery of the inlet riser 2, and the flexible The joint 3 is arranged under the christmas tree block 4, preferably, it also includes a chuck 6 arranged above the christmas tree block 4, the chuck 6 is detachably connected to the riser 2, and the christmas tree block 4 and The top drive 5 is connected with the controller; the top drive 5 is used for pulling the conventional riser 1 and sending the riser 2;

[0043] Specifically, the bearing capacity of the flexible joint 3 is greater than twice the tensile force of the lower part of the flexible joint 3, ...

Embodiment 2

[0047] Such as Figure 1-2 As shown, a deep water riser emergency suspension string method, which is applied to the deep water riser emergency suspension string system, includes the following steps:

[0048] S1: Disassemble the tool connected to the upper part of the conventional riser 1, and then drive the conventional riser 1 to move upward to a first preset height, so that the distance between the lower part of the conventional riser 1 and the seabed mud surface is greater than 50 meters;

[0049] Specifically, before the emergency suspension of the conventional riser 1, it is necessary to remove various drilling tools on the upper part of the conventional riser 1, so as to avoid damage to the tools when hanging, and at the same time, pull the conventional riser 1 upwards to prevent the conventional riser 1 from being suspended. The water pipe 1 collides with the seabed mud surface in bad weather or under special circumstances. In this embodiment, the S1 is specifically imp...

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Abstract

The invention discloses a deep water riser emergency suspension string system and method. The method comprises the following steps that S1, a tool connected to the upper part of a conventional riser is removed, then the conventional riser is driven to move upward to the first preset height, so that the distance between the lower part of the conventional riser and the bottom mud surface is more than 50 meters; S2, the conventional riser and a feed riser are connected through a flexible joint; S3, whether the position of the flexible joint is lower than that of an oil recovery tree pulley in a moon pool of a drilling platform or not is determined, if not, the conventional riser and the feed riser are lowered, and if so, S4 is carried out; S4, the oil recovery tree pulley is driven to the drilling wellhead center; S5, the feed riser is adjusted to the center of the oil recovery tree pulley; and S6, the feed riser is lifted to the second predetermined height through ejection drive. According to the deep water riser emergency suspension string system and method, a traditional riser tensioner is replaced by the ejection drive to meet the demand of soft suspension, and at the same time, the oil recovery tree pulley is used for straightening the riser to avoid collision.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a deepwater riser emergency suspension pipe string system and method. Background technique [0002] In the ocean, weather has a great impact on drilling ships or drilling platforms, especially in severe weather, such as typhoons. The conventional emergency method requires dismantling all risers and blowout preventers (BOP) and storing them appropriate. However, my country's South China Sea is affected by its special geographical location, which leads to abnormal climate changes. It is worth noting that the formation time of earth typhoon is short and the frequency of occurrence is high, and the prediction is very difficult. As a result, when earth typhoon comes, the drilling platform lacks enough time to A conventional emergency method is implemented, so an emergency method that can be quickly implemented is required for emergency response. [0003] At present, some people in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/00E21B41/10
CPCE21B19/002E21B41/10
Inventor 唐军黄芳飞许本冲孙明远于亮冯起赠刘双莹丁永丹鹿擎良谢雪恋
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY