Hole diameter instrument

Abstract

The invention provides a hole diameter instrument which comprises a body, a measurement mechanism and a steering mechanism, wherein the measurement mechanism comprises a first measurement component, a second measurement component and an elastic device, the second measurement component and the first measurement component are arranged in an included angle mode, a first end of the first measurement component and a first end of the second measurement component are arranged in the extending direction of the body in a reciprocating movement mode, a second end of the first measurement component is hinged to a second end of the second measurement component, the elastic device is used for driving the first measurement component and the second measurement component to move relative to one another, the steering mechanism is arranged on the body and is in abutting connection with one end, far away from the first measurement component, on the second measurement component, and the steering mechanism is used for detecting change displacement of the second measurement component in the radial direction of the body. The hole diameter instrument is applied, and the purpose of bidirectional well logging by the hole diameter instrument can be achieved through the measurement components and the steering mechanism.

Description

technical field [0001] The invention relates to the field of measuring devices, in particular to a borehole caliper instrument. Background technique [0002] Four-arm independent caliper tools are widely used in the field of petroleum logging. With the advancement of drilling technology, there are more and more horizontal wells, and the requirements for caliper tools are also increasing. In some new logging methods such as memory logging, in order to reduce the energy consumption of the caliper tool, the measuring arm is required to be non-driven, that is, the measuring arm must be kept in a normally open state whether it is uphole or downhole. Most of the four-arm caliper instruments in the prior art move down after the measuring arm is folded, and then after reaching the measuring position, the measuring arm is opened under the drive of the motor for upward measurement. Although this kind of boom measuring instrument has a certain bi-directional movement function, its mai...

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the prior art: the instrument measuring instrument in the prior art needs shafts and other parts to be matched with the compression spring 2', and also needs to design the space for the travel of the shafts, which makes the overall structure of the caliper instrument more complicated

This method not only increases the length of the instrument, but also causes the technical problem of reduced measurement accuracy due to the small opening angle.

And the caliper tool in the prior art is in the direction of figure 1 The force shown on the right side is poor, and the device may still be stuck or even damaged.

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