Shell of electromagnetic wave resistivity instrument

A technology of resistivity and electromagnetic wave, which is applied in the shell field of electromagnetic wave resistivity instruments, can solve the problems of low precision, narrow application area, and difficulty in shell structure design, and achieve reliable shell sealing and high anti-vibration performance , The effect of receiving less interference

Active Publication Date: 2013-04-24
DAQING PETROLEUM ADMINISTRATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electromagnetic wave resistivity while drilling is the primary problem of LWD logging, and the measurement of electromagnetic wave resistivity near the drill bit is even more difficult due to the mechanical and physical space constraints of the motor.
Measuring-while-drilling systems at home and abroad usually use the electrode type to measure the resistivity near the drill bit. Compared with the electromagnetic wave method, its accuracy is low and its application range is narrow (it cannot be measured in oil-based mud)

Method used

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  • Shell of electromagnetic wave resistivity instrument
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  • Shell of electromagnetic wave resistivity instrument

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing, the present invention is further described: figure 1 As shown in , the shell of the electromagnetic wave resistivity instrument includes a short joint body 1, the outer wall of the short joint body 1 has a groove, and a buckle cover body 2 matching the shape around the groove is fixed in the groove, and the outer wall of the buckle cover body 2 is spaced Antenna slot 10 is arranged, and antenna rib 5 is installed on the upper opening of antenna slot 10, and bosses are left on the inner walls of both sides of antenna slot 10, and the bosses cooperate with concave antenna ribs 5 at both ends; the lower opening of antenna slot 10 Gasket 7 is installed, and transmitting and receiving antennas are installed in the antenna groove 10 below the antenna rib 5. After the antenna is installed, it is sealed with glue and supported by gasket 7 after sealing; there is a wiring hole 6 on the gasket 7, and the antenna The line is drawn fr...

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Abstract

The invention relates to a shell of an electromagnetic wave resistivity instrument. The shell of the electromagnetic wave resistivity instrument comprises a short segmental body (1) of which the outer wall is provided with a groove, the groove is internally fixed with a buckle cover body (2) coinciding with the groove in shape, the outer wall of the buckle cover body (2) is spaced with an antennagroove (10), an upper opening of the antenna groove (10) is provided with an antenna rib (5), a lower opening of the antenna groove (10) is provided with a gasket (7) which is provided with a routinghole (6), and an installation groove (11) is arranged on the inner wall of the buckle cover body between two adjacent antenna grooves (10). The invention overcomes the limits of motor machines and physical space, designs the shell structure of the electromagnetic wave resistivity instrument in the limited space, and realizes near-bit resistivity measurement in an electromagnetic wave mode with high precision and wide application range.

Description

Technical field: [0001] The invention belongs to the category of downhole testing instruments for petroleum drilling, in particular to a shell of an electromagnetic wave resistivity instrument. Background technique: [0002] At present, the measurement-while-drilling system LWD is usually equipped with an electromagnetic wave resistivity instrument, which can measure the resistivity geological parameters of the formation, and control the wellbore trajectory based on this. Electromagnetic wave resistivity while drilling is the primary problem of LWD logging, and the measurement of electromagnetic wave resistivity near the drill bit is even more difficult due to the limitation of motor machinery and physical space, and the structural design of its shell. Measuring-while-drilling systems at home and abroad usually use the electrode type to measure the resistivity near the drill bit. Compared with the electromagnetic wave method, its accuracy is low and its application range is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/0228E21B49/00
Inventor 杨志坚王广新杨智光李玉海谷玉堂范存郭福祥耿晓光任文进姚江涛
Owner DAQING PETROLEUM ADMINISTRATION
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