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A monitoring method for riser offset and offset direction

A technology of offset direction and water riser, which is applied in related disciplines, can solve problems such as large errors, large power consumption, and complex algorithm implementation, and achieve the effects of improving efficiency, reducing power consumption, and broadening the scope of application

Inactive Publication Date: 2017-02-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the disadvantages of large errors, large power consumption, and complex algorithm implementation in the prior art, the present invention provides a strain-based deepwater riser offset and offset direction monitoring method, which only uses the strain of several riser outer walls to Parameters such as the maximum strain, inclination, offset and offset direction of the riser can be obtained, which can save costs, improve efficiency, and reduce the complexity of monitoring operations

Method used

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  • A monitoring method for riser offset and offset direction
  • A monitoring method for riser offset and offset direction
  • A monitoring method for riser offset and offset direction

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Effect test

Embodiment

[0105] Using the data given in the invention effect section: assume that the riser length is 3000m, the outer diameter is 53.3cm, it is in 3000m of water, and it bends under loads such as ocean currents and top tension. One measuring point every 200m, a total of 16 measuring points. All measurement points are at an angle of 25° to the reference direction, such as image 3 shown. The strain measured at each measuring point is shown in Table 1 and Table 2.

[0106] Table 5. Strain measured by three strain sensors at each measuring point

[0107]

[0108] Table 6. Strains measured by three strain sensors at each measuring point

[0109]

[0110] According to formula (12), combined with the strain data in Table 5 and Table 6, it can be obtained that the values ​​of the maximum bending strain at each measuring point are shown in Table 7 and Table 8. According to formula (14), the angle between the maximum strain and the first strain sensor is 45°; according to formula (15)...

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Abstract

The invention provides a method for monitoring offset and offset direction of a riser. The method comprises the following steps of selecting N monitoring points along the riser, uniformly distributing three strain sensors at the outer wall of the riser for each monitoring point along the axial direction of the riser, solving the maximum strain and the angle between the offset direction and the reference direction of each monitoring point, sequencing the maximum strains of the monitoring points, obtaining the maximum bending strain sequence, building the whole bending strain of the riser, and finally calculating the offset and inclining angle of the riser. The method has the advantages that the cost is saved, the efficiency is improved, and the complexity of monitoring operation is decreased.

Description

technical field [0001] The invention belongs to the field of offshore oil and gas exploration and development, and involves material mechanics, fluid-solid coupling vibration, calculus, sensor technology and other related subjects. Background technique [0002] As the link between the subsea wellhead and the offshore operating platform, the riser plays an important role in isolating seawater, guiding drilling tools, circulating drilling fluid, and compensating the heave movement of floating drilling units. No matter what kind of floating system scheme is adopted for deep-sea oil and gas exploitation, the riser is an indispensable equipment for offshore oil and gas exploitation, and it is also one of the weak and vulnerable components. The riser in the deep water environment, under the joint action of various loads such as ocean currents, waves, and sea surface platform oscillation, drift, and undulating motion, not only produces a large offset, but also generates alternating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32G01B21/22G01B21/02
CPCG01B21/02G01B21/22G01B21/32
Inventor 王海燕李保军刘叙含姚海洋申晓红杨伏洲张鹏飞赵晓博张之琛
Owner NORTHWESTERN POLYTECHNICAL UNIV