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Metal-to-metal sealing tieback connector

A metal seal and metal seal ring technology, applied in the field of offshore oil and gas drilling, can solve the problems of high operating costs and increased development costs of oil and gas wells, and achieve the effects of saving development costs, compact connection structure, and simplifying the opening process

Active Publication Date: 2010-07-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of offshore operations is high, and additional drill strings will increase the development cost of oil and gas wells

Method used

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  • Metal-to-metal sealing tieback connector
  • Metal-to-metal sealing tieback connector
  • Metal-to-metal sealing tieback connector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: with a 339mm (13 3 / 8 ") metal-to-metal sealing tie-back connection tool as an example, the present invention will be further described in detail.

[0023] refer to figure 1 . The metal-to-metal sealed tie-back connector of the present invention comprises a tie-back connector body 1, a gravity lock ring 3, a rubber seal ring 6, an upper metal seal ring 7, a lower metal seal ring 8, shear nails 10 and a seal ring base 11 .

[0024] The tie-back connector body 1 is cylindrical, and the upper end of the tie-back connector body 1 has an internal thread, and the internal thread can be connected with the external thread at the lower end of the tie-back pipe. Tieback connector body 1 has 339mm at the top (13 3 / 8 ″) Casing partial ladder thread, compatible with 339mm (13 3 / 8 ″) tie-back strings are connected at the lower end. Run the metal-to-metal sealed tie-back connector through the tie-back string to the casing hanger in the subsea wellhead head. ...

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Abstract

The invention relates to a metal-to-metal sealing tieback connector used for pipeline connection between a sea production platform and an underwater wellhead, which is applied to the operation of offshore oil gas well. In the invention, a twisting keyway is arranged on the inner wall of a tieback connector body, a gravity clamping ring is arranged in a ring groove of the tieback connector body, a sealing ring base which is fixed on a cylinder by a shear pin is arranged at the lower part of the outer wall of the tieback connector body, an upper metal sealing ring and a lower metal sealing ring which are a combined expansion sealing ring are arranged on top of the sealing ring base; oil gas production pipeline is established between a sea production platform christmas tree and the underwater wellhead by automatic locking connection of the gravity clamping ring and an underwater wellhead casing hanger; the metal-to-metal sealing connection is realized by pressing down the upper metal sealing ring and lower metal sealing ring to start sealing; the connection of the tieback connector and the casing hanger can be simplified, so the connector has compact structure and high safety and reliability; and metal-to-metal sealing can be started in the process of rotation, so the technology is simplified and the development cost is reduced.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas drilling, in particular to a sealed connection joint for connecting a pipeline connecting a sea surface oil production platform to an underwater wellhead when an offshore oil and gas well is completed. Background technique [0002] At present, when oil and gas are exploited in shallow seas, after a well is drilled on a floating drilling platform, a fixed offshore oil production platform is used for oil production. There is a long distance between the fixed offshore oil production platform and the subsea wellhead, and a tieback string is used to connect the subsea wellhead to the fixed production platform. The lower end of the tie-back string is connected with the subsea well head on the seabed through a tie-back connector. The tie-back pipe string generally ranges from tens of meters to thousands of meters according to the water depth. The seawater is isolated by the tie-back string...

Claims

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Application Information

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IPC IPC(8): E21B43/013F16J15/06
Inventor 曹川侯福祥尹洪伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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