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A deepwater riser emergency suspension string system and method

A technology of deep water riser and riser, which is applied in the field of drilling, can solve the problems that the conventional riser cannot be suspended, so as to meet the demand of soft suspension and avoid the effect of deflection displacement

Active Publication Date: 2021-08-31
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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  • A deepwater riser emergency suspension string system and method
  • A deepwater riser emergency suspension string system and method

Examples

Experimental program
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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 includes the following steps: S1: dismantle the tool connected to the upper part of the conventional riser, and then drive the conventional riser to move upward to a first preset height, So that the distance between the lower part of the conventional riser and the seabed mud surface is greater than 50 meters; S2: Use a flexible joint to connect the conventional riser and the feeding riser; S3: Determine whether the position of the flexible joint is lower than the moon pool of the drilling platform If not, lower the conventional riser and feed the riser, if yes, execute S4; S4: Drive the Christmas tree block to the center of the drilling wellhead; S5: Adjust the feed riser to the Xmas tree At the center of the tackle; S6: Lift the feeding riser to the second predetermined height through the top drive. The invention replaces the traditional riser tensioner by the top drive to meet the requirement of soft suspension, and at the same time uses the Christmas tree block to straighten 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 Patents(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