Signal wireless electromagnetism transmission system while drilling

A radio and magnetic transmission technology, applied in the field of transmission while drilling, can solve the problems of destroying the drill pipe structure, redesigning the drill pipe, and greatly affecting the transmission performance, so as to increase the transmission distance, improve the directivity and gain, and transmit fast effect

Inactive Publication Date: 2013-05-08
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

This method can significantly increase the transmission speed, but this method also has great disadvantages: it needs to destroy the structure of

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  • Signal wireless electromagnetism transmission system while drilling
  • Signal wireless electromagnetism transmission system while drilling
  • Signal wireless electromagnetism transmission system while drilling

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Embodiment Construction

[0020] The wireless electromagnetic transmission system of the signal while drilling according to the present invention, such as figure 1 As shown, the transmission system is arranged on the drilling well, and the drilling includes a drill pipe 11, a drilling tool 12, and a drill collar 13. The two sections of drill pipe 11 can be directly connected, and can be connected by a metal drill pipe short 15. The drill pipe 11 and the drilling tool 12 are connected by drill collar 13. The transmission system includes a drill pipe 11 , a drill collar 13 , a drill tool 12 , an electromagnetic signal transmitting module 21 , a relay shorting module 23 , and an electromagnetic signal receiving module 22 .

[0021] The receiving module 22 comprises an annular metal pipe 14 . The annular metal pipe 14 is sheathed on the drill pipe 11 exposed to the ground, and the inner diameter of the annular metal pipe 14 is larger than the outer diameter of the drill pipe 11 . The transmitting module ...

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Abstract

The invention provides a signal wireless electromagnetism transmission system while drilling. The signal wireless electromagnetism transmission system while drilling comprises a drill pipe, a drill collar, a drill tool, an electromagnetic signal emission module, a relay pup joint module and an electromagnetic receiving module. The electromagnetic signal receiving module comprises a loop metal tube, a loop antenna and a receiving circuit, the loop antenna and the receiving circuit are arranged in a loop groove at the bottom of the outer side of the loop metal tube, and the loop metal tube is sleeved on the ground drill pipe. The electromagnetic signal emission module is arranged in a loop groove of the outer side of the drill collar, and the drill collar is connected between the drill tool and the drill pipe. The relay pup joint module comprises a metal drill pipe pup joint, two groups of loop antennas, a relay amplifying circuit and battery, and the metal drill pipe pup joint is connected between the upper section of the drill pipe and the lower section of the drill pipe. The two groups of loop antennas, the relay amplifying circuit and the battery are arranged in a loop groove of the outer side of the metal drill pipe pup joint. By the way of relay, relaying transmission is carried out, transmission distance is not limited, and the data transmission rate is higher.

Description

technical field [0001] The invention relates to the transmission technology while drilling. Background technique [0002] Mud pulse transmission is still commonly used for wireless transmission of signals while drilling. However, the speed of mud pulse transmission is slow, usually only a few bits to a dozen bits, and the real-time performance is poor, and it cannot be used for gas drilling. Therefore, the mud pulse transmission method can no longer meet the needs of modern logging while drilling. In addition, a wireless electromagnetic transmission method currently used is to use the drill pipe as an asymmetric dipole antenna to transmit the signal to the ground. This method is also called the EM-MWD system. Since the drill pipe is used as the dipole antenna, Therefore, the system needs to use insulation short-circuit, so that the drill pipe becomes the upper and lower arms of the dipole antenna. Due to the use of complete insulation, it will affect the strength of the dr...

Claims

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Application Information

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IPC IPC(8): E21B47/13
Inventor 孙向阳聂在平
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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