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A Stress Joint Based on Top Tensioning Riser and Its Optimal Design Method

A stress joint and top tensioning technology, applied in casing, drill pipe, calculation, etc., can solve the problem that the stress joint is difficult to meet the functional and economical requirements, and achieve a simple and easy design process and reduce bending Stress, Effect of Low Elastic Modulus

Active Publication Date: 2011-12-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the design of stress joints is mostly based on the relevant experience of the designer, and the stress joints are designed according to the existing stress joints and the marine environment in service. Therefore, when the marine environment and production requirements of the service area change, the designed stress joints will be difficult. Meet the functional and economical requirements in this marine environment

Method used

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  • A Stress Joint Based on Top Tensioning Riser and Its Optimal Design Method
  • A Stress Joint Based on Top Tensioning Riser and Its Optimal Design Method
  • A Stress Joint Based on Top Tensioning Riser and Its Optimal Design Method

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] Such as figure 1As shown, the top tensioned riser system includes a surface Christmas tree 1 , a tensioner 2 , a tensioner joint 3 , a riser 4 and a riser joint 5 . The stress joint 6 of the present invention is arranged at the bottom of the entire top tension riser system, its top end is connected with the riser joint 5 , and its bottom end is connected with the underwater well head system through a tie-back joint 7 .

[0038] Such as figure 2 As shown, the stress joint 6 of the present invention is in the shape of a cone, its inner diameter is constant, its outer diameter gradually increases from the top to the bottom, and its wall thickness gradually increases.

[0039] The stress joint 6 of the present invention is made of titanium-aluminum alloy with high strength and low elastic modulus, and can withstand high stress, high bending mome...

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Abstract

The invention relates to a stress adapter based on a top tension-type vertical tube and an optimum design method thereof. The invention is characterized in that the stress adapter is tapered, the inside diameter of the stress adapter is constant, the outside diameter of the stress adapter is gradually increased from top to bottom, the wall thickness of the stress adapter is gradually increased, the top of the stress adapter is connected with the vertical tube, the bottom end of the stress adapter is connected with an underwater head system. The optimum design method comprises the following steps of: (1) acquiring basal data of the vertical tube and calculating a top outside diameter and a constant inside diameter of the stress adapter; (2) selecting a design parameter (alpha j); (3) determining a bottom outside diameter (Phi eL) according to the following formula: alpha j=RjL / Ri0= PhieL / Phie0; (4) determining a length (Lj) of the stress adapter according to the following formula: Lj=Rj0 Theta j(alphaj-1) / ln(alpha j); (5) determining a cross-sectional outside diameter (Phi ex) according to the following formula: Pie x=Phie0alphax; and (6) designing the stress adapter based on the results of the above steps, then checking performances of the stress adapter, and returning to the step (2) if the check results are not meet the performance requirements.

Description

technical field [0001] The invention relates to a stress joint and an optimal design method thereof, in particular to a stress joint based on a top-tensioned riser and an optimal design method thereof. Background technique [0002] With the great increase of deepwater development activities, the technical equipment of deepwater development is also constantly facing new challenges, and different requirements are put forward for the riser system connecting the submarine pipeline and the platform. Deepwater risers are flexible structures that are often directly connected to rigid structures. When both ends of the riser are fixedly connected to the rigid structure, especially the production riser is directly connected to the seabed or directly to floating structures, platforms, etc. When the connection is fixed, its flexibility will sharply decrease or even disappear. The bending strength of such a connection is very important in the local response. Therefore, when designing a d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02G06F17/00
Inventor 贾旭张崎矫滨田黄一邹星张日曦许亮斌刘刚沙勇徐阳
Owner CHINA NAT OFFSHORE OIL CORP
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