CN211577447U

CN211577447U - Casing coupling detection device

Info

Publication number: CN211577447U
Application number: CN201922315072.6U
Authority: CN
Inventors: 柳杨; 郭永胜; 殷艳利; 李维; 路艳齐
Original assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Current assignee: China Institute of Radio Wave Propagation CETC 22 Research Institute
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2020-09-25
Anticipated expiration: 2029-12-21

Abstract

The utility model discloses a sleeve pipe coupling detection device, including the steel cylinder, block and lower end cap are installed respectively at the both ends of steel cylinder, set up zero position point on the steel cylinder, erection bracing frame in the steel cylinder places homopolar magnet steel in opposite directions at the both ends of support frame, installs two relative adjustable fasteners on the support frame, is the mounting disc between two adjustable fasteners, at the side of mounting disc along 4-8 giant magnetoresistance sensor of equidistant arrangement of circumference. The utility model discloses a detection device, which can solve the problem that the conventional magnetic positioning signal is influenced by speed measurement; the detection sensitivity is improved, and the unobvious coupling can be better identified.

Description

Casing coupling detection device

Technical Field

The utility model belongs to sleeve pipe coupling detection field, in particular to sleeve pipe coupling detection device in this field.

Background

The core of the existing magnetic positioning probe is composed of magnetic steel and coils, as shown in fig. 1, 1 is magnetic steel, 2 is a coil framework, 3 is a coil winding, and 4 is a magnetic steel magnet, which can magnetize surrounding steel substances, and the magnetized substances are externally represented as magnets with polarities, thereby affecting the magnetic field distribution of the original magnets. The petroleum casing pipe is made of steel materials and can also be magnetized, when a magnetic positioning instrument advances in the casing pipe, magnetic lines of force generated by the two magnetic steels are distributed the same before encountering a coupling, so that the variation of total magnetic flux generated in a coil is not changed, induced electromotive force is not generated, when encountering the coupling, the magnetic field distribution of the two magnetic steels is asymmetric, so that the total magnetic flux can be changed, the induced electromotive force is generated at the moment, and the position of the coupling of the casing pipe can be judged according to the detected voltage jump of a fixed shape.

The existing magnetic positioning is to detect the position of a sleeve coupling according to the electromagnetic induction principle and induce electromotive force

Therefore, the magnetic positioning signal is related to the variable of the magnetic flux and time, and the change of the magnetic flux is influenced by the magnetic field intensity of the permanent magnet, the number of turns of the coil, the change of the coupling to the original magnetic field distribution and other factors. As long as the magnetic flux change is not zero, the faster the speed measurement, the stronger the magnetic positioning signal, and vice versa, the smaller. The cable logging construction focuses more on the construction efficiency, the speed measurement is generally fast, the obtained magnetic positioning signal is very strong, and sometimes noise and useful signals are difficult to distinguish. The storage logging usually adopts a drilling tool conveying instrument, the speed of the storage logging is not well controlled compared with that of cable logging, the storage logging generally advances at a slow speed, the obtained magnetic positioning signal is small, sometimes even the shape of a coupling cannot be identified, and the magnetic positioning signal is weak due to the fact that the size of the coupling of a casing is not obvious. In addition, the casing may be damaged to different degrees in the circumferential direction due to the influence of external force and chemical corrosion, and the conventional magnetic positioning is difficult to identify.

Disclosure of Invention

The utility model aims to solve the technical problem that a sleeve pipe coupling detection device is provided.

The utility model adopts the following technical scheme:

the improvement of a casing collar detection device is that: the sensor comprises a steel cylinder, wherein an upper cover cap and a lower plug are respectively installed at two ends of the steel cylinder, a zero position point is arranged on the steel cylinder, a support frame is installed in the steel cylinder, homopolar magnetic steel is oppositely placed at two ends of the support frame, two opposite adjustable fasteners are installed on the support frame, an installation disc is arranged between the two adjustable fasteners, and 4-8 giant magneto-resistance sensors are arranged on the side surface of the installation disc at equal intervals along the circumferential direction.

Furthermore, the mounting plate is made of non-metal materials.

The improvement of a casing coupling detection method using the device is as follows: the giant magnetoresistance sensor is powered on, the output voltage of the giant magnetoresistance sensor is measured, the mounting disc is fixed by rotating the adjustable fastener again, the output of the sensor is at zero volt, the magnetic force line is zero in the magnetic field parallel to the giant magnetoresistance sensitive shaft at the moment, the mounting disc is positioned at a zero position point, an instrument runs when a casing does not meet a coupling, the magnetic field parallel to the sensitive shaft is small, the output voltage is low, the distribution of the magnetic force line changes after the coupling is met, the direction and the size of the magnetic field can be changed, the size and the direction of the output voltage can be correspondingly changed, and the casing coupling is detected and identified.

The utility model has the advantages that:

(1) the problem that the conventional magnetic positioning signal is influenced by speed measurement is solved;

(2) the detection sensitivity is improved, and the unobvious coupling can be better identified.

(3) The detection is more precise, and the circumferential corrosion and damage conditions of the sleeve can be distinguished.

Drawings

FIG. 1 is a schematic diagram of a prior art magnetic positioning probe;

fig. 2 is a schematic structural diagram of the detection device of the present invention;

FIG. 3 is a schematic structural diagram of a detecting part in the detecting device of the present invention;

fig. 4 is a magnetic force distribution diagram when two homopolar magnetic steels are placed opposite to each other.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Cased hole cementing quality evaluation measurements typically include acoustic amplitude, variable density, natural gamma, and magnetic localization, where magnetic localization is used for collar detection, and in combination with natural gamma, is primarily used for logging depth correction to determine the perforation location. The conventional magnetic positioning instrument detects the position of a casing collar according to the electromagnetic induction principle, but a detection signal is influenced by speed measurement and the shape of the casing, the embodiment discloses a magnetic collar detection device, detects the position of the casing collar according to the magneto-resistance effect principle, overcomes the defects of conventional magnetic positioning, can better adapt to different speed measurement construction requirements, improves the detection sensitivity of the collar, and finally obtains qualified magnetic positioning logging data.

Example 1 this example discloses a casing collar sonde for use in perforating site depth correction, as shown in figure 2. The device comprises an upper cover cap 21, a steel cylinder 22, a zero position point 23, a lower joint 24, an electronic circuit and necessary connecting leads. The core part of the probe is shown in figure 3 and mainly comprises

magnetic steels

31 and 35, a support frame 32 and a giant magnetoresistance sensor 37, the two magnetic steels are oppositely placed in the same pole to provide a static magnetic field for the giant magnetoresistance sensor, a mounting disc is made of a non-metal material, a plurality of (generally 4-8) giant magnetoresistance sensors are fixed on the side face at equal angles, and fine detection can be carried out on the circumferential direction of a sleeve.

Different from a conventional magnetic positioning instrument, the position of a casing coupling is identified through the magneto-resistance effect in the embodiment, the magneto-resistance effect of the used giant magneto-resistance sensor is larger by more than one order of magnitude than that of the conventional magneto-resistance sensor, so that the giant magneto-resistance sensor has high sensitivity, and in order to make the form of a coupling signal consistent with that of the conventional instrument, the linear output giant magneto-resistance sensor is selected, namely when the size and the direction of a magnetic field are changed, the size and the direction of the output voltage of the sensor are changed accordingly. As shown in fig. 3, the mounting plate 36 is fixed on the supporting frame 32 by the

adjustable fasteners

33 and 34, the

magnetic steels

31 and 35 with the same magnetic poles are placed at two ends of the supporting frame in opposite directions, the generated magnetic field distribution is as shown in fig. 4, and is affected by the magnetic difference of the magnetic steels and other factors, the symmetric center of the magnetic force line and the center of the supporting frame may have a point deviation, the giant magnetoresistance sensor is powered on to measure the output voltage thereof, the adjustable fastener is rotated to fix the mounting plate again, so that the output of the sensor is about zero volt, at this time, the resultant magnetic field of the magnetic force line in the direction parallel to the giant magnetoresistance sensitive axis is about zero, and the position of the mounting plate 36 corresponds to the. When the casing of the instrument runs and does not meet a coupling, the resultant magnetic field in the direction parallel to the sensitive shaft is very small, the output voltage is very low, and the distribution of magnetic lines of force changes after meeting the coupling, so that the direction and the size of the resultant magnetic field can be changed, the size and the direction of the output voltage can be correspondingly changed, the resistance characteristic of the giant magnetoresistance sensor is only related to the magnetic field, and the distribution of the magnetic field is unrelated to the speed, namely the output signal and the speed of the detection method are unrelated. The giant magnetoresistance sensor has high sensitivity, can cause the change of magnetoresistance due to the change of a weak magnetic field in a magnetic sensitive axial direction, and can identify the sleeve collar which is not obvious. External force, chemical corrosion and other factors can be damaged in a certain circumferential direction of the sleeve, the average effect is measured by a conventional magnetic positioning instrument, and the circumferential multi-sensor distribution can be used for carrying out more precise detection on the sleeve.

The core of the embodiment is to detect the casing coupling by the magnetic sensitivity characteristic principle of the giant magnetoresistance sensor, and try to change the installation and fixing method of the sensor, the number of the sensors, the form of the signal conditioning circuit and other auxiliary measures to be considered as alternatives of the embodiment.

Claims

1. A casing collar detection device is characterized in that: the sensor comprises a steel cylinder, wherein an upper cover cap and a lower plug are respectively installed at two ends of the steel cylinder, a zero position point is arranged on the steel cylinder, a support frame is installed in the steel cylinder, homopolar magnetic steel is oppositely placed at two ends of the support frame, two opposite adjustable fasteners are installed on the support frame, an installation disc is arranged between the two adjustable fasteners, and 4-8 giant magneto-resistance sensors are arranged on the side surface of the installation disc at equal intervals along the circumferential direction.

2. A casing collar detection device as claimed in claim 1 wherein: the mounting plate is made of non-metal materials.