SU100053A1 - Device for measuring natural potentials in a well - Google Patents

Description

The well-known and widely used method of measuring the natural potentials in a well in the presence of stray currents using a so-called stable probe is reduced to measuring the potential difference along the wellbore between the point electrode and the long linear M electrode located above it.

The use of a stable probe necessitates a separate descent, while with other methods, the natural potential curve is recorded simultaneously with the resistance curve. The need for additional descent of the probe lengthens the process of well-karting and reduces the productivity of the carotene batch.

In addition to this, with increased density of stray currents or a large reservoir, the measurements of natural potentials are significantly distorted due to the fact that the potential of the linear electrode, which is the average value of the potential of the well site opposite to this electrode along the well.

The object of the invention is to eliminate the drawbacks of measuring the natural potentials with a stable probe and to obtain an undistorted curve of natural potentials.

According to the invention, it is proposed to place an additional point electrode above the linear electrode and to insert a second recording instrument between it and the linear electrode.

The undistorted portions of the curves recorded by the Instruments connected between the linear and two point electrodes are used to construct an undistorted natural potential curve.

To eliminate mutual interference between the two measuring circuits, the recording devices can be connected to the linear electrode through a pulsator, which periodically connects them to different half-periods.

The drawing shows two variants of the proposed device.

As shown in the drawing, in addition to the point electrode Mn of the linear electrode N, the device uses an additional point electrode M located above the electrode .V. Between the linear electrode L and the two dotted electrodes L1 and M, the recording-ie measuring instruments PS and // C are switched on,

With help of those who are at the same time behind. two curves are written.

The uncorrupted natural potential curve is composed of parts of these two curves that are not distorted by the influence of the finite electrode length.

In areas where the potential probe is not used, recording natural potential curves can be made using a pulsator, as shown in the drawing. In this way, each of the curves is recorded in different half-periods, and therefore the mutual interference between the two measuring circuits is eliminated. And the ipskazheina curve is obtained in it and in X and X by the curve and LO in.

Subject invention

1. A device for measuring the testable potential of a well in the presence of interference from stray

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currents, using a stable probe, which is a linear electrode with a point electrode below it, between which a recording device is connected, characterized by the fact that an additional point electrode with a recording device connected between them is connected to a linear electrode the undistorted curve of natural heat waves by means of splicing to draw the undistorted portions of the curves recorded by both instruments.

2. The form of the device according to claim 1, so that in order to avoid mutual interference between the two measuring circuits, the devices are connected to the linear electrode through a pulsator, which periodically connects them to different half periods.

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