Compensating neutron well logging instrument

Abstract

The invention relates to a neutron logger for measuring stratigraphic porosity in borehole, and its technical solution mainly comprises top joint, casing, power supply framework, thermos flask, neutron detector (He 3 tube), signal processing circuit framework, screening body, neutron source house, and bottom joint, as well as pulse signal processing circuit, communication control and data transmission circuit, and power supply circuit, and it is characterized in that: the neutron detector is composed of two neutron detectors on the same side of the neutron source, where the two neutron detectors are respectively called short spacing (SS) and long spacing (LS), according to their spacing from the neutron source. And the SS and LS neutron detectors, screening body, fixing devices and pulse signal processing circuit are arranged in a heat insulating device and the two neutron detectors are both coated with thermal conductivity protective layers. The invention has high detecting efficiency, higher error compensation and data processing accuracy, high integrity of signal processing circuit and power supply circuit, and strong stability, convenient to use and maintain.

Description

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AI Technical Summary

Benefits of technology

The present invention relates to an improved method for detecting radiation emitted from deep underground oil wells that uses two different types of nuclear reactor technology: double-neutrons (DN) or gamma rays (γ). This allows better accuracy than previous methods due to less impact on drilling environments during measurements. Additionally, this new approach has higher integrated circuits with stronger stabilization capabilities making it easier to operate and maintain over time without losing its effectiveness.

Problems solved by technology

This patented technology describes two types of tools used for measuring fluid properties such as permeability within formations during drilling operations. One type uses an accelerator device called a scintillometer, while another one uses thermocouple devices. However, both techniques have limitations when applied together because each technique requires its own electronics and does not work well over varying hole conditionings and errors associated therewith.

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