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Underwater wellhead device special for deepwater gas field

An underwater wellhead and gas field technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problems of high price, unfavorable deepwater development status, etc., achieve low price, improve load transfer and Stress distribution, economical effect

Inactive Publication Date: 2019-04-12
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the subsea wellhead system, subsea tree system and subsea manifold system with a pressure rating of 15,000 psi are used, although the reliability is higher, the price is expensive, which is extremely unfavorable to the status quo of deepwater development under low oil prices

Method used

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  • Underwater wellhead device special for deepwater gas field
  • Underwater wellhead device special for deepwater gas field
  • Underwater wellhead device special for deepwater gas field

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Embodiment Construction

[0021] The present invention will be further described in detail through the accompanying drawings and specific embodiments below.

[0022] Such as Figure 1-Figure 6 As shown, a special underwater wellhead device for a deep-water gas field of the present invention includes a high-pressure wellhead 1, a low-pressure wellhead 2, an extension casing 3 connected to the low-pressure wellhead 2, and an anti-gas channeling mud pad 4.

[0023] A first load-bearing ring 11 is provided on the outer wall of the high-pressure wellhead 1 , and the high-pressure wellhead 1 overlaps the first support portion 21 of the inner wall of the low-pressure wellhead 2 through the first load-bearing ring 11 .

[0024] A mandatory locking ring 5 is arranged above the first bearing ring 11, a groove 51 is opened on the radial outer wall of the mandatory locking ring 5, and a radial inner wall of the mandatory locking ring 5 is in contact with There is a gap 100 between the outer walls of the high-pres...

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Abstract

The invention discloses an underwater wellhead device special for a deepwater gas field. The underwater wellhead device special for the deepwater gas field comprises a high-pressure wellhead, a low-pressure wellhead and an extension sleeve connected to the low-pressure wellhead. A first bearing ring is arranged on the outer side wall of the high-pressure wellhead, and the high-pressure wellhead islapped on a first supporting part of the inner side wall of the low-pressure wellhead through the first bearing ring. A forced locking ring is arranged above the first bearing ring, a groove is formed in the radial outer side wall of the forced locking ring, a gap exists between the radial inner side wall of the forced locking ring and the outer side wall of the high-pressure wellhead, and an annular locking mechanism is wedged downward into the gap. By adopting the technical scheme, the high-pressure wellhead and the low-pressure wellhead can be locked together forcibly so as to strengthen the connection between the high-pressure wellhead and the low-pressure wellhead, the load transmission and stress distribution are improved, and the service life of the high-pressure wellhead and the service life of the low-pressure wellhead are prolonged.

Description

technical field [0001] The invention relates to a special underwater wellhead device for a deep-water gas field, belonging to the technical field of oil and gas exploration and development. Background technique [0002] The subsea wellhead system is closely related to subsequent drilling and completion operations. Any accident in the low-pressure wellhead or any other part of the subsea wellhead system will have an irreversible impact on the development of the entire well. At present, the underwater wellhead system is completely dependent on foreign imports, and the production and on-site services of underwater wellheads are concentrated in the hands of wellhead companies in Europe and the United States, mainly including FMC, GE-VetcoGray, Cameron, Drill-Quip and AkerSolutions in Norway Companies, etc. Foreign underwater wellhead suppliers have problems such as long supply cycles (at least 1 year) and limited supply, which restrict China's exploration and development in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/035
CPCE21B33/035
Inventor 黄小龙同武军田瑞瑞关清涛熊爱江闫伟陈杰
Owner CHINA NAT OFFSHORE OIL CORP
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