SU1002551A1 - Gyroscopic inclination meter - Google Patents

Description

an order of magnitude more accurate than a single angular velocity sensor in the device being described, since it operates in compensation mode at the level of the signal of the criticalizing sensitivity, and the linearity of the sensor does not matter; design complexity; insufficient accuracy.

The aim of the invention is to improve the accuracy and reliability of measurements and simplify the design.

The goal is achieved by the fact that in a gyro inclinometer containing a body, a three-degree gyroscope, two angle sensors, mounted on a moving eccentric frame, an angular velocity measuring sensor, a torque motor, a conversion unit and two digital phase meters, an angular velocity sensor is mounted on the outer frame a three-degree gyroscope, with the axis of sensitivity of the angular velocity sensor located perpendicular to the kinetic moment vector of the three-degree gyroscope, the output of the sensor Glov speed coupled with torque motor, whose stator is arranged on the outer frame of the gyroscope and the inner rotor.

At the same time, digital phase meters are located in the ground part of the inclinometer, the outputs of which are connected to the recorder.

FIG. 1 is a schematic diagram of the device; in fig. 2 - fn n kcio and al.

A free three-degree gyroscope 2 is placed in the housing 1 (Fig. 1. A measuring angular velocity sensor 3, a torque motor 4, a BSKT rotation angle sensor 5, the stator of which is connected to the eccentric frame 6) are rigidly fixed to the outer frame of the three-power gyroscope. The eccentric frame consists of the housing of the load 7, displaced relative to the axis of rotation. The case of the second angle-of-rotation sensor BSKT 8 is rigidly connected with the case of the eccentric frame, on the shaft of the rotor of which there is an antenna 9. The BSKT is located in a plane perpendicular to tionary frame offset eccentric load. Signals from BSKT SBKT 5 and 8 enter the converter unit 10.

The functional diagram of the device shows the relationship of the measuring and conversion elements, which are included in the following sequence: the signal from the measuring angular velocity sensor 3 is fed to the amplifier 11 and from the amplifier to the torque motor 4. From the BSKT 5 signal goes to the phase-shifting circuit 12, which is connected through a converter 13 with a unit for measuring the azimuth of the ground panel. With BCCT 8, the signal enters the phase-shifting circuit 14, which is connected via a converter 15 and a connecting cable 16 to a unit for measuring the zenith angle of the ground panel. The ground panel azimuth angle measurement unit is a transducer 1.7 and a digital phase meter 18, and a zenith angle measurement unit is a transducer. 19 and the digital phase meter 20. From the digital phase meters, the signals enter the recorder 21 and are recorded in the form of a digit using a digital printer 22

Azimuth and zenith angle transducers, digital phase meters, a recorder and a digital printing device are enclosed in a ground panel 23.

When measuring the curvature of the well, the longitudinal axis of the instrument is set parallel to the axis of the well, which is characterized by the azimuthal angle ot and the zenith angle: U. the azimuth angle measurement uses a three-degree gyroscope 2, an angular velocity sensor 3, a torque motor 4, and a BSKT rotation angle sensor 5 (Fig. 1}. Since the BSKT rotor 5 is connected to the outer frame of the three-degree gyroscope, and the housing with the KOg iycoM eccentric frame 6, then it receives a signal proportional to the angle between the inclination plane (the eccentric frame is set to the inclination plane / and some direction, which is set by the three-degree gyroscope. The three-degree gyroscope undergoes precession by the disturbing moments The vertical axis of rotation of the outer frame and the angular velocity sensor does not respond to the angular velocity of the precession, since the angular velocity vector of precession is directed along the axis of rotation of the outer frame of the three-degree gyroscope and coincides with the direction of the angular velocity vector of the gyroscopic angular velocity sensor. There is a certain angle with the plane of the meridian and from it the amplifier receives a signal proportional to the angle of mismatch in between the projection of the angular velocity vector grow rotation. Earth vector of the kinetic moment of the three-degree gyroscope (Fig. L). From the amplifier, the signal enters the torque motor, which causes the three-stage gyroscope to precess until it is set in the plane of the meridian and the signal from the angular velocity sensor is zero. Kinetic moment vector. An H three-degree gyro is set in the direction of the server. The vector-kinetic moment H of the angular velocity sensor is directed along the axis of rotation of the outer frame from a three-degree gyroscope. During the correction, the device stops the wells, so that it is not affected by the signal from the angular velocity sensor, which occurs when the device moves along the curved section of the well, with BSKT 5, the signal enters the photoelectric circuit 12, which is connected through the converter 13 and the connecting cable 16 s the azimuth measurement unit of the ground panel, which consists of a converter 17 and a digital phase meter 18, the signal from which is fed to the recorder 21 and is digitally recorded by a digital printing device 22.

The zenith angle is measured with the BSKT 8, on the shaft of the rotor of which the tandem 9 is fixed. When measuring the zenith angle, the BSKT rotor under the action of the tilt rotates by the magnitude of this angle. The signal from the BSKT, proportional to the sine and cosine of the zenith angle, enters the phase-shifting circuit 14 and through the converter 15 and the connecting cable 16 into the ground panel 23. In the ground panel, the signal through the converter 19 and digital phase meter 20 enters the recorder 21 and is digitally fixed by digitizing device 22.

The azimuth and zenith angles are measured by the inclinometer continuously without stopping the downhole tool, and the dp correction of the three-degree gyroscope downhole tool is stopped for the correction time, then the measurement continues.

In the USSR, gyroscopic inclinometers are not commercially produced, therefore a feasibility study can be carried out in comparison with commercially available inclinometers, which use the Earth's magnetic field (whale, infrared-2) to determine the azimuth. Compared with the base sample, a gyroscopic inclinometer is characterized by reliable determination of azimuthal and zenith angles in wells where direct observation of sensitive elements is impossible, since due to the influence of magnetic masses, inclinometers that use the Earth’s magnetic field give an incorrect result; direct measurement of the curvature of the well inside the column of steel and light-alloy drill pipes without lifting them to the surface, which drastically reduces the amount of round trip operations when the well is wired with measurement continuity with azimuth correction during a stop.

As a result, it drastically reduces the inclinometric measurements and unproductive tripping operations of the drilling tool. This makes it possible to increase the productivity of drilling operations, especially in directional drilling. Thus, more than 90% of all wells are carried out in an obliquely directional way in Western Siberia, and inclinometric measurements during the drilling of these wells account for 30% of the total volume of all geophysical work. On the basis of this, the economic efficiency from the introduction of one gyro inclinometer is 48 thousand rubles. in year.

Claims (3)

1. A gyroscopic inclinometer comprising a housing, a three-degree gyroscope, two rotation angle sensors mounted on a moving eccentric frame, an angular measuring speed sensor, a torque motor, a conversion unit and two digital phase meters, characterized in that, in order to improve the accuracy and reliability of measurements and simplify the design, the angular velocity sensor is mounted on the outer frame of the three-degree gyroscope, and the axis is sensitive. The angular velocity sensor is located perpendicular to the kinetic moment vector of a three-degree gyroscope, the angular velocity sensor output is connected to a torque motor, the stator of which is placed on the outer frame of the gyroscope, and the rotor on the inner. 2. Inclinometer according to claim 1, which is based on the fact that the digital phase meters are located in the ground part of the inclinometer, the outputs of which are connected to the recorder. Sources of information taken into account in the examination 1. USSR author's certificate for application 282223/03, cl. E 21 B 47/022, 1970. 2. USSR author's certificate number 450883, cl. E 21 B 47/022, 1974. 3. USSR Author's Certificate for Application No. 2938961/03, cl. E. 21 B 47/022, 1980. FIG. 1 n f L //