Small-diameter electromagnetic flow comprehensive logging instrument

Abstract

The invention discloses a small-diameter electromagnetic flow comprehensive logging instrument which comprises an underground electromagnetic flow logging instrument and a ground logging control system. The underground electromagnetic flow logging instrument comprises a lower centering device, an electromagnetic flow meter, a hole diameter measuring instrument, a pressure and temperature measuring device, a data processing device and a cable connector. The ground logging control system comprises a cable winch, an underground instrument signal processing circuit, a ground processor module connected with the underground instrument signal processing circuit and an industrial control computer connected with the ground processor module, wherein an optical-electricity encoder is installed on the cable winch and is connected with the ground processor module. The small-diameter electromagnetic flow comprehensive logging instrument is compact in structure, reasonable in design, simple and convenient to operate, good in reliability, high in logging accuracy, good in using effect and convenient to popularize and use.

Description

technical field [0001] The invention relates to a logging tool, in particular to a small-caliber electromagnetic flow comprehensive logging tool. Background technique [0002] In the prior art, turbine flowmeters are often used for flow logging. The sensor of the turbine flowmeter is composed of blades mounted on a pivot. The pivot is equipped with a magnetic key or an opaque key. The bearing is generally made of very wear-resistant industrial sapphire. . Because the blades of the turbine have a certain inclination angle, when the fluid flows through the blades, a rotational moment will be generated to make the turbine rotate. Due to the special mechanical structure, the turbine flowmeter must have a certain starting flow rate to make the blades rotate, and cannot measure smaller flow rate; moreover, the turbine flowmeter is easily affected by debris in the well and rock particles produced during the drilling process, resulting in increased measurement errors. In addition,...

AI Technical Summary

Problems solved by technology

Because the blades of the turbine have a certain inclination angle, when the fluid flows through the blades, a rotational moment will be generated to make the turbine rotate. Due to the special mechanical structure, the turbine flowmeter must have a certain starting flow rate to make the blades rotate, and cannot measure smaller Moreover, the turbine flowmeter is easily affected by debris in the well and rock particles produced during the drilling process, resulting in increased measurement errors

In addition, when the logging tool cannot be strictly centered, the error of the interpretation result of the logging data will be extremely large; the interpretation of the flow logging must refer to the comprehensive interpretation of the well diameter and other hydrological logging curves to obtain the correct result; Without knowing the flow temperature gradient, the relative water content of each well section and the whole well section cannot be well understood; and in the prior art, these problems have not been well resolved

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