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Antenna outer cover structure of downhole instrument

A technology for downhole instruments and covers, which is applied in the field of antenna cover structure, can solve the problems of antenna protection failure and easy loosening of screws, etc., and achieve the effect of reliable protection and good strength

Pending Publication Date: 2021-09-24
GUOYI PETROLEUM TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature, high pressure and high corrosiveness of the underground working environment, accompanied by long-term strong vibration, the screws are easy to loosen, which will cause the entire antenna cover to fail to protect the antenna

Method used

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  • Antenna outer cover structure of downhole instrument
  • Antenna outer cover structure of downhole instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] An antenna cover structure of a downhole instrument, see Figure 1-Figure 2 , which includes a drill collar body 10 and an annular cover 20;

[0028] The drill collar body 10 is provided with an inner concave ring groove 11 corresponding to the antenna arrangement area, and the inner concave ring groove 11 is used to arrange the antenna;

[0029] The annular outer cover 20 is composed of splicing at least two circular arc pieces 21, and the axial length of each circular arc piece 21 is arranged corresponding to the axial length of the inner concave ring groove 11;

[0030] A plurality of circular arc pieces 21 are arranged around the corresponding outer circumference of the inner concave ring groove 11, and are connected by welding to form an integral annular outer cover 20;

[0031] The circumferential ends of the annular outer cover 20 are respectively welded to the corresponding end ring walls 12 of the inner concave ring groove 11;

[0032] A plurality of long cir...

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Abstract

The invention provides an antenna outer cover structure of a downhole instrument, which enables an outer cover and a drill collar body to be integrated into a whole and enables the outer cover to reliably protect an antenna. The antenna outer cover structure comprises the drill collar body, an inner concave ring groove is formed in the position, corresponding to an antenna arrangement area, of the drill collar body, and the inner concave ring groove is used for arranging the antenna; the antenna outer cover structure further comprises an annular outer cover which is formed by splicing at least two arc sheets, and the axial length of each arc sheet corresponds to the axial length of the inner concave ring groove; a plurality of arc sheets are annularly distributed on the corresponding outer circumference of the inner concave ring groove and are connected through welding to form an integral annular outer cover; the circumferences of the two axial ends of the annular outer cover are connected with the ring walls of the corresponding ends of the inner concave ring groove in a welded mode respectively; and a plurality of long circular grooves are formed in the outer circumference of the annular outer cover.

Description

technical field [0001] The invention relates to the technical field of downhole instrument structures, in particular to an antenna outer cover structure for downhole instruments. Background technique [0002] In the process of oil and gas development, directional wells and horizontal wells are increasing. In order to ensure that the wellbore advances in the oil and gas reservoir, logging while drilling tools have been paid attention to and developed rapidly. Due to the particularity of logging while drilling, downhole instruments generally use wireless methods for signal transmission. Among them, the antenna, as a key component of electromagnetic wave signal transmission and reception, needs to be protected in harsh underground conditions. [0003] At present, the outer side of the drill collar body used for setting the antenna is provided with a cover, and the cover is connected to the drill collar body through a screw connection. The number of screw joints is limited and...

Claims

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Application Information

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IPC IPC(8): H01Q1/42
CPCH01Q1/42
Inventor 丁渊刘森冯泽东贺羽
Owner GUOYI PETROLEUM TECH (WUXI) CO LTD
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