Profile meter

FIELD: geophysics.

SUBSTANCE: device has body, spring-loaded levers jointly connected to it, levers position indicator, made in form of constant magnet mounted at joint connection end of each measuring lever, and signal converter, mounted in body in protective chamber. Constant magnet is made in form of washer and is mounted in circular groove on rotation axis of each lever, and as signal converter magnetic-resistive sensor is used in form of resistive bridge circuit sensitive to direction of magnetic field and non-sensitive to its intensity, while magnetic axis of constant magnet is in plane of washer and is directed perpendicularly to sensitivity axis of magnetic-resistive sensor.

EFFECT: higher precision, simplified construction, lesser dimensions.

3 dwg

 

The present invention relates to the field of geophysical research wells, namely the means to assess the condition of the wells with cavernosometry and profilometry.

A device of the pig, in which the changing profile of the wellbore can be seen in the result of the contact spring elements (springs-ski) with the wall. The change of the radius of curvature of the spring skiing is transmitted to the movable sleeve with a permanent ring magnet, which is moving along the body of the device, the effect on the resistive elements, through movable contacts mounted in the housing of the device. Thereby, changes the resistance of the resistive element, the value of which is recorded by the measurement unit on surfaces (Ed. mon. No. 1574804, E 21 In 47/08, bull. No. 24, publ. 30.06.90,)

Thus, converts the mechanical movement of the lever into an electric signal.

In the known device uses a widely known classic dimmer with slider, where the drive slider is a magnet, and a rheostat is a resistive element, which is the same. The magnetic drive is not a position indicator disclosure of levers and a signal Converter and a mechanical actuating device having a low resolution, which has such drawbacks is to, as the hysteresis of the actuator, due to what appears systematic error in the measurements. In addition, the device with a resistive element within a technologically run length is less than the required as 100-200 mm is not possible, therefore, increases the length of the device. This arrangement of the device also prevents the device is of small diameter, which limits the number of ribs of the pig.

Know another device for converting mechanical movement into an electrical signal used flux-gate magnetometer with a permanent magnet mounted on the end hinge-connected to the casing of the measuring arm along its longitudinal axis. Flux-gate magnetometer installed in a sealed non-magnetic chamber in the body of the instrument, and terrasond installed perpendicular to the longitudinal axis of the pig.

By changing the position of the permanent magnet relative to the axis of the magnetically sensitive element of the magnetometer, what happens when you change the position of the measuring lever along a well bore, there is a linear dependence of the intensity of the magnetic field from a height of irregularities in the borehole wall (ABT. mon. No. 1288290, E 21 In 47/08, bull. No. 5, publ. 07.02.87 year).

Thus, in the known device, the permanent magnet is a position indicator is disclosed which I lever, and flux-gate magnetometer is a direct Converter of this provision into an electric signal.

In the known device the primary and the main drawback is the presence of terrasond 7 with a flux-gate magnetometer 6, as in the dynamics, while drawing the downhole tool will be picking up the magnetic field from the column, and terrasond will register a false disclosure levers through the non-camera 8, and simultaneously on all the levers. That is, terrasond 7 is simultaneously sensitive to the magnetic field and to the direction of the magnetic field (see the description of the invention). The characteristic of the transducer is nonlinear initially, because when you change the angle levers changing the distance between the magnet and verizoncom, and therefore creates a different field strength, since the magnet has a rectangular shape and is not installed on the axis of the clamp arm of the pig. Thus, the required accuracy of measurement cannot be achieved.

The proposed use of the pig will solve the problem of increasing the accuracy and resolution profile measurements well in a wide range of downhole temperature, and to achieve simplify the design and reduce the size of the device.

The problem is solved in that in the nofilemenu, comprising a housing, hinge-connected spring arms, the position indicator disclosure of leverage in the form of a permanent magnet located on the hinge-connected end of each of the measuring arm, and a signal Converter is mounted in the housing in a protective chamber, a permanent magnet made in the form of washers and installed on the axis of rotation of each lever, and as the signal Converter is used magnetoresistive sensor, which is resistive-bridge circuit that is sensitive to the magnetic field direction and is not sensitive to the tension, and the magnetic axis of the permanent magnet is in the plane of the washer and oriented relative to the signal Converter.

The permanent magnet may be made in the form of circular plates, and initially folded arms its magnetic axis oriented perpendicularly to the axis of sensitivity of the magnetoresistive sensor.

Figure 1 presents the block diagram of the pig.

Figure 2 is given resistive-bridge circuit of the sensor.

Figure 3 presents the layout of the power field of the permanent magnet relative to the line sensor sensitivity that is installed on the circuit Board.

The pig includes: a housing 1, articulated associated spring arms 2, which are connected with the spring means of the pins 3 and have the axis of rotation 4, this swivel all levers are in the same plane located perpendicular to the axis of the device. Each lever 2 has a circular groove 5, in which is located a permanent magnet 6 in the form of washers, rotating together with the lever 2 around the axis 4. Magnetic washer 6 has a flat shape, in the plane of its axis 7 passes power of the magnetic field (direction N-S).

In the housing 1 has a groove 8, which is oriented to the axis 7 of the power of the magnetic field of the magnet 6. In the groove 8 has a protective cylinder 9, which is placed inside the magnetoresistive sensor 10, the output of which is fed through the amplifier 12 on the surface panel 13 a downhole tool.

The magnetoresistive sensor 10 is a resistive-bridge circuit (figure 2), the characteristics of which feature to be sensitive to the direction of the magnetic field and is not sensitive to the tension.

In the folded condition levers magnetic axis 7 of the magnet 6 is oriented perpendicular to the direction of sensitivity of the sensor 10 (Fig 3).

The spring 11 serves to disclosure of the lever, this changes the angle α.

The device operates as follows.

In the folded state, the levers 2 are laid along the housing 1, the spring 11 is compressed. In this state, is fixed the magnetic North direction the OS is 7 and the azimuth angle 0 deg.

When passing in the well levers 2 copy the elevation of the borehole walls, opening to a certain angle αturning around the axis 4 with a magnet 6. Thus there is a change of the azimuth angle, which is equivalent to changing the angle between the axis of the instrument and the plane of the lever 2.

When you rotate the magnet 6 around the axis 4 is the change of direction of the magnetic field that is fixed resistive-bridge circuit of the sensor 10. The total magnetic field strength existing in the column wells, does not affect the operation of the sensor 10.

Figures 2 and 3 explain the operation of the device.

To the points a and b of the scheme there is power supply from the power supply Epic. With output points C and D removed a differential output signal U, which is fed to the input of the amplifier 12, which U served on the panel 13.

When the angle α there is a change in the direction of the impact force field of the permanent magnet 6 on the diagram of the magnetoresistive sensor 10, resulting in a variation of the output signal U.

This design of the pig (when the common axis of rotation and are the lever and the magnet) allows to achieve high resolution in the measurement.

The use of such a sensor allows the pig with a high sensitivity to change of the angle of the lever to achieve a more accurate measurement of the profile is Kvasiny.

Due to the technical characteristics of the used sensor (temperature range from -50 to +190° (C) increases the operating temperature range of the pig, which is especially important in high-temperature wells.

In addition, simplifies the design, significantly reduced the dimensions of the device, since the construction uses the compact signal Converter (magnetoresistive sensor value is not more than 3 mm).

The pig, including the housing, the hinge-connected spring arms, the position indicator disclosure levers, made in the form of a permanent magnet mounted on the hinge-connected end of each of the measuring arm, and a signal Converter that is installed in the housing in a protective chamber, characterized in that the permanent magnet is made in the form of washers and installed in a circular groove on the axis of rotation of each lever, and as the signal Converter is used magnetoresistive sensor, which is resistive-bridge circuit that is sensitive to the magnetic field direction and insensitive to its tension, and the magnetic axis of the permanent magnet is the plane of the washer and is initially oriented perpendicular to the axis of sensitivity of the magnetoresistive sensor.



 

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FIELD: geophysics.

SUBSTANCE: device has body, spring-loaded levers jointly connected to it, levers position indicator, made in form of constant magnet mounted at joint connection end of each measuring lever, and signal converter, mounted in body in protective chamber. Constant magnet is made in form of washer and is mounted in circular groove on rotation axis of each lever, and as signal converter magnetic-resistive sensor is used in form of resistive bridge circuit sensitive to direction of magnetic field and non-sensitive to its intensity, while magnetic axis of constant magnet is in plane of washer and is directed perpendicularly to sensitivity axis of magnetic-resistive sensor.

EFFECT: higher precision, simplified construction, lesser dimensions.

3 dwg

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