Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Double-layer combined casing with girth weld and assembling method thereof

A combined casing and assembly method technology, which is applied in the direction of casing, drill pipe, earthwork drilling and production, etc., can solve the problems that there is no double-layer combined casing assembly method, the oil production project cannot be carried out, and the inner layer casing is damaged, etc., to achieve Improve the integrity and connection strength and rigidity, improve the quality of fixing, and save production costs

Pending Publication Date: 2019-10-25
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Double-layer composite casing is an important means of early casing protection. At present, most double-layer composite casings use the method of injecting cement between the inner and outer casings. In a large area, the extrusion force of the formation is directly transmitted to the inner casing through the outer casing and the cement sheath, causing damage to the inner casing, making it impossible to carry out the oil production project, and the construction is complicated and difficult to operate
At the same time, there is no specific assembly method for the double-layer composite casing in the existing documents and patents.

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
  • Double-layer combined casing with girth weld and assembling method thereof
  • Double-layer combined casing with girth weld and assembling method thereof
  • Double-layer combined casing with girth weld and assembling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing:

[0027] Such as figure 1 As shown, a double-layer combined casing with a girth weld includes an internally threaded collar joint 1, an externally threaded collar joint 2, an outer layer casing 3, an inner layer casing 4 and a connecting ring, wherein the outer layer The casing 3 has three sections, including an internal thread collar joint section 31, an external thread collar joint section 32 and a connecting ring 33 between the two sections; the internal thread collar joint section 31 and the external thread joint section of the outer casing 3 The collar joint section 32 is threadedly connected with the inner thread collar joint 1 and the outer thread collar joint 2 respectively, and the two ends of the inner casing 4 are respectively connected with the inner thread collar joint 1 and the outer thread collar joint 2, and the inner thread collar joint 1 and the outer thread...

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 double-layer combined casing with a girth weld and an assembling method thereof. The double-layer combined casing comprises an internal thread coupling joint, an external thread coupling joint, an outer casing layer and an inner casing layer; the outer casing layer is divided into an internal thread coupling joint section and an external thread coupling joint section, a connecting ring is arranged at the connecting position of the internal thread coupling joint section and the external thread coupling joint section, and the internal thread coupling joint section and the external thread coupling joint section are connected with the connecting ring in an overlap welding manner; and the outer casing layer is connected with the internal thread coupling joint and the external thread coupling joint, and the inner casing layer is connected with the internal thread coupling joint and the external thread coupling joint. The connecting and sealing performance of the double-layer combined casing is effectively improved, meanwhile, the anti-outward extrusion performance of the double-layer combined casing is effectively improved, a sealed cavity is formed in an annular space of the inner casing layer and the outer casing layer, effective buoyancy of the casing in drilling fluid is increased, centering of the double-layer casing in a horizontal section is facilitated, and the fixing mass is improved.

Description

technical field [0001] The invention belongs to the technical field of casings used in the exploration and development of oil and gas fields, and in particular relates to a double-layer composite casing with a girth weld and an assembly method thereof. Background technique [0002] With the deepening of the production and development of various oilfields at home and abroad, casing damages of varying degrees have occurred in most oilfields, which has caused a great impact on oil production and development. Double-layer composite casing is an important means of early casing protection. At present, most double-layer composite casings use the method of injecting cement between the inner and outer casings, which can improve the collapse resistance of the casing. In a large area, the extrusion force of the formation is directly transmitted to the inner casing through the outer casing and the cement sheath, causing damage to the inner casing, making the oil recovery project impossi...

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): E21B17/00E21B17/08
CPCE21B17/00E21B17/08
Inventor 刘永刚杨尚谕韩礼红王蕊路彩虹冯耀荣
Owner BC P INC CHINA NAT PETROLEUM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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