EM-MWD relay transmission system

A transmission system and short-circuit technology, which is used in surveying, wellbore/well components, earth-moving drilling, etc., can solve the problems of limited transmission distance, insufficient transmission distance, and difficulty in determining the transmission distance of asymmetrically excited drill pipe antennas. Achieve the effect of increasing the transmission speed and extending the transmission distance

Inactive Publication Date: 2013-08-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its transmission distance is usually limited
In addition, since the transmission distance of EM-MWD is related to the formation parameters, and the formation parameters are usually unknown, it is difficult to determine how far the transmis

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
  • EM-MWD relay transmission system
  • EM-MWD relay transmission system
  • EM-MWD relay transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The present invention improves on the existing EM-MWD system, including the drilling rod 13, the drilling tool 11, the insulation module 14, the electromagnetic signal transmitting module 12, and the electromagnetic signal receiving module 15 of the existing EM-MWD system; The signal transmitting module is set between the drill pipe and the drilling tool, the insulation module is set on the electromagnetic signal transmitting module, and the electromagnetic signal receiving module is set on the ground. The electromagnetic signal receiving module is connected to the ground through an antenna and a An antenna connected to the ground at a certain distance receives electromagnetic signals. The electromagnetic signal transmitting module and the electromagnetic signal receiving module here are all existing modules of the EM-MWD system, and the specific structures are not repeated here. In order to realize the relay transmission of electromagnetic signals, a relay short-circui...

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 provides an EM-MWD relay transmission system. The EM-MWD relay transmission system comprises drill rods, a drill tool, an insulation module, an electromagnetic signal transmitting module, an electromagnetic signal receiving module and one or more relay short-circuit modules, wherein the relay short-circuit modules are arranged among the drill rods, and spacing distances of more than one relay short-circuit modules can be set on the premise that signal strength of the electromagnetic signal receiving module during signal receiving is larger than or equal to a threshold value. The EM-MWD relay transmission system prolongs an EM-MWD transmission distance through relays. If the transmission distance is not enough in the EM-MWD process while drilling, relay short circuits can be increased to continue to perform transmission. In addition, the transmission speed can be improved by improving frequency, even though improved frequency likely enables an original EM-MWD transmission distance to be shortened, the whole transmission distance is not limited by adopting the relays.

Description

technical field [0001] The invention belongs to the technical field of transmission while drilling, in particular to the wireless electromagnetic transmission technology of signals while drilling. Background technique [0002] In oil exploration and other geological drilling projects, the electromagnetic measurement-while-drilling (EM-MWD) technology, which uses metal drill pipe as an asymmetrically excited dipole antenna to realize logging-while-drilling signal transmission, is one of the research focuses in recent years. This method overcomes the shortcoming that mud pulse cannot be applied in air drilling, and has no requirement on mud quality. [0003] EM-MWD uses the drill pipe as an antenna. By setting the insulation module near the drill bit of the drill pipe, the upper and lower ends of the insulation module are powered and excited. Therefore, the entire drill pipe and drilling tools form a very asymmetrical dipole antenna. , The transmission of signals is realized ...

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): E21B47/12
Inventor 孙向阳聂在平
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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