Method for predicting slow drifting movement of deep water semisubmersible drilling platform

A drilling platform and semi-submersible technology, which is applied in the field of predicting the slow drift movement of deep-water semi-submersible drilling platforms, and can solve the problem of time-consuming calculations

Active Publication Date: 2012-04-25
CHINA NAT OFFSHORE OIL CORP +1
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the calculation of average drift motion and low-frequency slow drift motion often relies on time-domain methods, and the calculation is time-consuming

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for predicting slow drifting movement of deep water semisubmersible drilling platform
  • Method for predicting slow drifting movement of deep water semisubmersible drilling platform
  • Method for predicting slow drifting movement of deep water semisubmersible drilling platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Embodiment 1. Predicting the extreme value and meaningful value of the slow drift movement of the deepwater semi-submersible drilling platform

[0101] The semi-submersible drilling platform (as figure 1 Shown) the slow drift motion analysis. Table 11 shows the calculation working conditions. The specific embodiment of the present invention is explained in detail through the slow drift motion analysis of each working condition. The calculation goal is to obtain the average drift, low frequency slow drift and low frequency slow drift of the mooring semi-submersible platform under the action of sea waves. Maximum, minimum, and meaningful values ​​for motion.

[0102] Table 1. Slow drift motion working conditions of deepwater semi-submersible drilling platform

[0103] Condition

Displacement (tons)

Significant wave height (m)

water depth(m)

Wave direction (°)

Mooring stiffness (N / m)

1

52000

11.0

1500

90

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for predicting slow drifting movement of a deep water semisubmersible drilling platform, which comprises the following steps of obtaining slow drifting movement analysis curves, calculating the mooring stiffness and calculating the slow drifting movement statistics parameter (average values and standard differences) and mooring parameter (mooring stiffness) influence rules and slow drifting movement limit values. The prediction parameters mainly comprise average drifting, maximum drifting, minimum drifting and slow drifting motion standard differences and are mainly used for the slow drifting evaluation of platform transverse oscillation and vertical oscillation modes. The considered influence factors mainly comprise mooring system parameters (mooring stiffness), ocean environment parameters (wave directions and effective wave height) and ocean platform parameters (drainage quantity). Compared with the time domain method adopted by the existing business software such as the computer software SESAM, Moses, Harp and the like, the method has the advantage that the calculation speed is high. Compared with the existing model test method, the method has the obvious advantages in aspects of time and cost.

Description

technical field [0001] The invention relates to a method for predicting the slow-drift motion of a deep-water semi-submersible drilling platform. Background technique [0002] With the development of deepwater offshore oil and gas exploration and development, the demand for large semi-submersible drilling platforms is increasing. The motion prediction technology of the deep-water semi-submersible platform is one of the key technologies for the platform to complete safe operations in operating conditions and to ensure the safety of the platform in survival conditions. [0003] Deep-water semi-submersible platforms serve in deep-water areas of the ocean, and the environmental loads acting on the platform are extremely harsh, mainly including waves, wind, and currents. The movement of a semi-submersible offshore platform under the action of wave force usually considers three components: ① wave frequency motion following the wave characteristic frequency; ② low-frequency slow d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B63B35/44
CPCB63B1/107B63B35/4413B63B2021/009B63B79/15B63B79/30
Inventor 谢彬王俊荣
Owner CHINA NAT OFFSHORE OIL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap