Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Offshore oil well drilling used water insulation duct and method for testing its elastic stability

A technology of elastic stability and water-resistant conduit, which is applied in drilling pipes, drilling equipment, underwater drilling, etc., and can solve the problems of material waste and irrationality

Inactive Publication Date: 2007-02-07
CHINA NAT OFFSHORE OIL CORP +1
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through in-depth research on the critical pressure of the riser under concentrated load and uniform load and its impact on operation, it is found that this traditional design is not reasonable, and the resulting waste of materials is also huge Yes, but what kind of rigid material should be used at what position, whether its safety performance can be guaranteed, when installing the wellhead blowout preventer group, how much weight can be carried on the riser and should be carried, etc. In the existing literature and textbooks, there is no ready-made answer to seek, these are the problems that the present invention needs to solve, and it is also one of the key issues to effectively control the development cost in the development of marginal oil fields

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
  • Offshore oil well drilling used water insulation duct and method for testing its elastic stability
  • Offshore oil well drilling used water insulation duct and method for testing its elastic stability
  • Offshore oil well drilling used water insulation duct and method for testing its elastic stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The invention is used to detect the critical load and stability of a drilling water riser in Bohai Oilfield.

[0085] It is assumed that the opening of the water-resistor 1 is in the drilling moon pool of the drilling platform at this time, and the top is in a fixed state. It is known that the water depth of an oilfield in the Bohai Sea is 25m, and the jack-up drilling platform is used for drilling operations, and the air gap is 10m. The top of the conduit is constrained by the wellhead plate, and the top can be regarded as the hinged end 3, and the bottom of which is 50m into the mud, which can be regarded as the fixed end 2. At this time, the data of the wellbore conduit and surface casing above the drilling wellbore mud hanging are as follows (Table 1 shown):

[0086]

Casing - Steel Grade - #

Outer diameter" / mm

inner diameter" / mm

length

m

Uniform load

kg / m

Remark

30”-X52

30”...

Embodiment 2

[0101] The invention is used to detect the critical load and stability of another drilling water riser in the Bohai Oilfield.

[0102] The water depth of the drilling is 32m, and the remaining field drilling conditions and technical parameters detected and collected are the same as those in Embodiment 1. According to the technical parameters collected during testing, the critical load of the drilling riser of this embodiment is calculated according to formula (23) under the condition of constant stiffness of the conduit, and the results are shown in Table 4.

[0103] Diameter

" / mm

outer diameter

cm

the inside diameter of

cm

critical load

kg / m

l Length

m

critical load

P cr t

String

Self-weight t

tensile safety

Coefficient

30”

76.2

71.12

461.3

42

458.554

39.2

54.8

20”

50.8

47.57

198

42

89.625

16.8

57...

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 relates to a water-separated tube used in marine oil well, and the method for detecting its flexibility stability, wherein the invention is characterized in that: said water-separated tube is in tower rigidity-variable post, while the upper part has lower rigidity and the lower part has high rigidity; the lengths and diameters of upper and lower posts meet the critical load formula as aforementioned formula, to design the projective parameter and detect present project. The invention can save steel consumption and reduce cost.

Description

technical field [0001] The invention relates to a water riser and a detection method thereof, in particular to a water riser used for offshore oil drilling and a detection method of its elastic stability. Background technique [0002] With the massive development of offshore marginal oilfields, how to adopt the most economical and effective means to obtain the maximum profit of the oilfields while satisfying the demand for safe and effective production of the oilfields is the subject of the applicant's key research. When oil drilling operations are carried out offshore, it is usually necessary to arrange a water riser consisting of a string of 30”×28” (OD×ID, outer diameter×inner diameter) pipe strings in the outer circumferential direction of the drilling wellbore. Since the wellhead blowout preventer is installed at the wellhead, the riser needs to bear the concentrated load P. At the same time, due to the large diameter of the riser and its own weight, it is also necessar...

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
IPC IPC(8): E21B17/00E21B7/12
Inventor 姜伟
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
Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com