SU755999A1 - Device for determining bending angles and coordinates of bore - Google Patents

Description

The invention relates to the field of measuring the curvature and coordinates of boreholes.

A two-step gyrotheodolite is known - a device for measuring the azimuth on the earth's surface, whose sensitive system is designed as a two-step gyro-tachometer [1].

The disadvantage of the two-step gyro-idolite is its high sensitivity to minor fluctuations and inclinations of the body relative to the vertical of the site. This disadvantage eliminates its use for determining the azimuth of boreholes, because in the process of measuring azimuth, the gyrotoodolite must be lowered into the well; while its body will move relative to the Earth, and the axis of suspension of the gyrotachometer, parallel to the axis of the borehole, can significantly deviate from the vertical of the site, which together gives unacceptable errors.

It is also known a device for determining the angles of curvature and wellbore coordinates, comprising a housing, a sensing system, a registering node b.

ten

15

20

25

The disadvantages of this device are the significant dimensions and weight of the inclinometer due to the need to use three gnrotametrog, as well as the impossibility of approaching the diameter of the borehole to the diameter of the gyro-tachometer due to the inclination of the output axis of the third gyro-tachometer at an angle of 20-30 ° relative to the longitudinal axis of the well.

The purpose of the invention is the provision of the possibility of measuring angles of curvature and coordinates in wells of small diameter.

The goal is achieved by the fact that the sensitive system is made in the form of two coaxial-sequentially installed two-step vibro-tachometers, the output axes of which are parallel to the axis of the body, and the axes of the rotors' own rotation are orthogonal to it.

FIG. 1 shows a block diagram of the connection components of the device; in fig. 2 is a diagram of the arrangement of parametric vibration gyrotachometers in the unit.

Device for determining the angles

the curvature and coordinates of the borehole includes 30

3

755999

four

<iometer 1, the sensitive elements of which are two two-step parametric vibration gyro-tachometers, a transfer roller with a depth gauge 2, an installation for connecting the cable and calculator β, which is either an electronic computer, for example, Nairi, Saratov-2, or specifically manufactured electronic. computing machine. Depth gauge 2 and calculator 3 are installed on the surface of the Earth. The inclinometer 1 and depth gauge 2 are connected to the transmitter 3 remotely via a cable.

The output axes of the parametric vibration gyrotachometers 4 and 5 (FIG. 2) are oriented parallel to the longitudinal axis of the OUd borehole, the axis of the inclinometer 6 cylindrical body coinciding with the longitudinal axis of the borehole, and the axes of the own rotation of the rotors of the gyrotachometers 4 and 5 are orthogonal to it, and the gyrotometers are coaxial. The discrete angle sensor 7, the amplifier-correction device 8 and the torque sensor 9 implement the electrical circuit of the gyro-tachometer.

The device works as follows.

When the inclinometer is lowered on a cable, the signals about the parametric vibration gyrotachometers 4 and 5 are transmitted via a cable at discrete points in time (η = 0, 1, 2 ...) to the transmitter 3. The output signal of the parametric vibration gyrotachometer changes as follows

⁺ Ρ "ιΐ sozgch ^ s.,

(1 = 1.2),

where is the slowly varying component of the output signal of the 1-gyro-tachometer;

RF ^and RFCh amplitudes with sinus

and cosine terms of the variable component of the output signal of the ίth gyrotachometer, respectively;

4 ^ - the angular velocity of the proper rotation of the rotor ί-th

5 gyro-tachometers

Output Split ϊ-γο

^{: the} gyro-tachometer for the variable and constant components is carried out by known methods (for example, electrical or algorithmic).

This device carries excess

. information on the angular velocity due to the fact that each parametric vibration gyrochometer measures by

. ”Two components of the vector of absolute angular velocity and allows you to use it to improve the accuracy of measurements.

Claims (1)

Claim A device for determining curvature angles and wellbore coordinates, comprising a housing, a sensitive system, a recording unit, which, in order to make it possible to measure curvature angles and coordinates in small-diameter wells, is sensitive 30, the system is made in the form of two coaxially-installed two-degree vibration vibrotachometry. ditch, the output axis of which is parallel to the axis of the hull, and the axis of its own 35 rotor rotation is orthogonal to it.