Multi-arm mechanical sidewall contact device and petroleum logging instrument

Abstract

The invention discloses a multi-arm mechanical sidewall contact device for a petroleum logging instrument. The multi-arm mechanical sidewall contact device comprises a plurality of approximate-parallelogram-shaped arm mechanisms, a power mechanism, a power conversion mechanism and a power transmission mechanism, wherein the power conversion mechanism is used for converting rotary motion from the power mechanism into reciprocal rectilinear motion; the power transmission mechanism is connected with the power conversion mechanism and the multiple approximate-parallelogram-shaped arm mechanisms to drive the multiple approximate-parallelogram-shaped arm mechanisms between an unfolding position and a folding position; and the power transmission mechanism comprises a thrust disc, long thrust rods and short thrust rods extending along the axis of the petroleum logging instrument are alternately arranged on the thrust disc in the circumferential direction of the thrust disc, the upper end portion of each of the long thrust rods and the short thrust rods is mounted on the thrust disc, the lower end portion of each of the long thrust rods and the short thrust rods is connected to the corresponding one of the multiple approximate-parallelogram-shaped arm mechanisms, and therefore long transmission chains and short transmission chains are formed correspondingly. The invention further discloses the petroleum logging instrument comprising the multi-arm mechanical sidewall contact device.

Description

Technical field [0001] The present invention generally relates to petroleum logging instruments, and more specifically to a multi-arm mechanical pusher for petroleum logging instruments, such as a six-arm mechanical pusher. Background technique [0002] A typical petroleum logging tool with a wall-mounted measuring electrode plate is a micro-resistivity scanning imaging instrument. The probe of this type of instrument needs to be pushed to a position close to the well wall by a multi-wall pusher. The sensor in the board transmits the formation parameter information in the form of a coupled electrical signal to the electronic circuit part for processing, and finally the computer interpolates the collected signal and reproduces it into an intuitive image, which serves as the basis for analysis by the stratum geological interpreter . [0003] There are many types of dobby thrusters used in the petroleum logging industry. The more popular classification method is to distinguish accord...

AI Technical Summary

Problems solved by technology

But this structure is only suitable for the case where the weight of the plate group is not large enough

When this structure is used to connect long, large and heavy measuring plates, the clutch soaked in hydraulic oil is easy to slip, the reverse self-locking function fails, and all measuring plates fall to the instrument in weightlessness The main matrix, causing safety accidents

[0006] The commonly used thrust rod sealing structure is that the sealing ring is installed on the thrust rod, so that the sealing ring will move with the reciprocating motion of the thrust rod, which is easy to wear and reduce reliability. At the same time, when replacing the sealing ring, the instrument shell needs to be disassembled, and then the thrust rod Replace the seal

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