Shell of electromagnetic wave resistivity instrument

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 ...

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)

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