SU40300A1 - Well curvature measuring instrument - Google Patents

Description

The main disadvantage of most existing instruments for determining the curvature of boreholes is, firstly, the need to remove the instrument from the well to produce each sample and, secondly, the accuracy of observation is low.

The proposed instrument is intended to examine and measure the directional distance of an inclined or vertical well along the entire length without repeatedly lowering and removing the instrument.

It is based on the principle of finding the azimuthal deviation in angles in two mutually perpendicular planes.

In the schematic drawing of FIG. 1 shows a side view of the device; FIG. 2 is a plan view of the device serving to prevent the instrument from rotating.

As can be seen from FIG. 1, the device consists of a massive shell 7, inside of which is a tandem 2 mounted on a swinging frame 3. Such a suspension (cardan suspension) ensures that the pilot maintains a constant vertical position for any deviation of the well, and hence the projectile.

A rotor with a winding mounted on each axis 4 is rotatable together.

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with the axis, without friction, in the interstitial space of the magnetic circuit-stator 5, excited by alternating current.

The second part of the device consists of the same magnetic stator and a rotor with a winding, the latter can be connected with a cable, in series or in parallel, to the corresponding rotor winding of the first part of the projectile. At the same time, the absence of current in the rotor circuit (meaning their location at the same angles to the stators corresponding to them) can be determined by any zero indicating AC device, such as: a thermocouple with a galvanometer, a detector galvanometer, a lamp voltmeter, etc.

The device needed to prevent spontaneous rotation in the borehole of the projectile may consist of shtangs that are pivotally attached to the projectile and have a second pivot, approximately at a distance of 0.5.-1.0 meter from the projectile.

Additional precautions may be applied in shtang consisting of three pipes welded along the length, forming a triangle in cross section, and in this case three rollers (Fig. 2) are installed at the mouth of the casing and serve as a measure to prevent them from rotating in rods the pipe. The subject matter of the invention. A device for measuring the curvature of wells with a tick on a gimbal suspension, characterized in that for the purpose of telemeasurement and zenith and azimuthal angles, two masters 2 are used, rotating on mutually perpendicular axes 4, equipped with a winding and playing the role of a rotor, inside the excited variable magnetic current 5.