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Logging coupling detection system

A detection system and logging technology, applied in surveying, wellbore/well components, earthwork drilling, etc., can solve problems such as unreasonable structure, difficult maintenance, poor anti-interference ability, etc., and achieve stable output voltage and anti-interference ability. Strong, stable signal amplitude

Active Publication Date: 2014-12-10
武汉海阔科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used measurement coupling systems are mostly composed of non-pushing methods, which will generate a lot of interference voltage output during the logging process, poor anti-interference ability, unreasonable structure, and difficult maintenance

Method used

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 , 2 As shown, this embodiment provides a logging collar detection system, including a magnet, an induction coil, a pusher, and an electrical control unit. The pusher has three pusher plates, and the three pusher plates are mutually formed The angle of 120 degrees acts as a centralizer, and a magnet and an induction coil are installed on the pusher pole plate, and the pusher can make the pole plate firmly adhere to the casing.

[0021] The magnet is composed of a group of magnets with N-S poles, which are installed close to the outer inner wall of the pole plate, and the function is to generate a magnetic field in the surrounding environment of the magnet.

[0022] The induction coil is made of high-temperature enameled wire wound on a rectangular parallelepiped magnetic rod. The two taps of the induction coil are directly output t...

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PUM

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Abstract

The invention relates to a downhole coupling detection technique, and provides a logging coupling detection system, which is applied to detection of the joint of a downhole casing and a casing. The logging coupling detection system comprises a group of magnets, induction coils, a geolock and an electrical control unit, the geolock is provided with three backup pole plates, a 120-degree angle is formed by each two backup pole plates, the magnets with N-S poles are arranged on the inner walls of the outer sides of the backup pole plates in a clinging manner and are used for generating a magnetic field in a surrounding environment, the induction coils cling to the magnets, two taps of each induction coil are directly outputted to the electrical control unit, and a program control amplifying circuit, an active filter circuit, an AD (analog-to-digital) conversion circuit, an MCU (micro-control unit) processing circuit and a three-bus interface module are sequentially connected to form the electrical control unit. The logging coupling detection system is high in integration, simple and convenient in maintenance and high in interference resistance.

Description

technical field [0001] The invention relates to a downhole collar detection technology, in particular to a well logging collar detection system, which is applied to the detection of joints between downhole casings and casings. Background technique [0002] With the rapid development of modern electronic and computer technology, logging instruments are constantly updated, forming a numerically controlled logging tool centered on electrical logging. The logging collar detection system is an important part of the oil well logging cable depth calibration instrument. Its principle is that the irregularity of the casing wall at the casing collar during the logging process affects the magnetic force lines, and the induction coil senses the magnetic force lines. The change of the voltage produces a voltage signal, which is sent to the subsequent circuit for processing and then sent to the ground for graphic output. The ground operator can judge the depth of the well by combining the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/04E21B47/13
Inventor 王永建赵瑞峰覃军李金亮
Owner 武汉海阔科技有限公司