SU1206433A1 - Apparatus for measuring hole length - Google Patents

Description

The invention relates to field geophysics and can be used to determine depths during well drilling, as well as to coordinate depth geophysical data.

The purpose of the invention is to increase the reliability of the device.

Figure 1 shows a diagram of the proposed device; Fig. 2 is a cross-section of the device, perpendicular to its axis, and passing through electromagnets; Fig. 3 is a schematic diagram explaining the operation of the device during magnetization of a pipe string; 4 is an electrical diagram of a power supply unit for electromagnets.

The device consists of a housing 1, with rigidly fixed brackets 2, to which a block 3 is mounted on the axis (FIG. 3). A cable is threaded through the unit 4. One end of the cable 4 is rigidly connected to the measuring base 5, the other to the electromagnet 6. The measuring base 5 is a rigid structure made of a nonmagnetic material, such as brass or bronze, but with sufficient mechanical strength . At the lower end of the measuring base, the second electromagnet 7 is rigidly fixed. The electromagnet housings 6 and 7 are made of magnetically hardened steel of the St.A3CO alloy type. In order to increase the contact surface of the electromagnets with the colon, their outer radius coincides with the inner radius of the pipe (Fig. 2) i.e. R RTP This is achieved by reducing the magnetic resistance of the section of the body of the electromagnet - the column and reducing the energy consumption for the magnetization of the column. A guide 8 is rigidly fixed on the body, along which the displacement of the dimensional base 5 takes place. The displacement of the guide 8 and the cable 4 takes place in the corresponding grooves a and b of the dimensional base. The control unit for the operation of the electrons of the yarn includes two reed switches 9 and 10, installed in the upper and lower parts of the measuring base and connected magnetically with the corresponding magnets 11 and 12 located in the body of the electromagnet 6. through a geophysical cable 13, on which the descent and ascent are also carried out

ten

15

20

25

thirty

35

40

45

50

55

devices in the well. The movement of the device occurs along the column14. The marking of the pipe column magnetic. marks and depth measurements are carried out as follows (Fig. 3).

The device is lowered onto the geophysical cable into the well, the length of which must be measured. The marking of the column and the measurement of the depth are carried out when the device is raised. Suppose, in the initial state, the device has the form shown in Fig. 3a. By pressing the toggle switch T on the surface of the earth, the control unit is started up, power is supplied to the input of the switches G1 and G2 (Fig. 4). Being in the position For, the reed switch 10 is triggered, its contacts are closed and the relay K1 is triggered (Fig.4), while its power contacts in the power supply circuit of the electromagnet are closed

7. At the expense of the created magnetic field, it is attracted to the column. From this moment on, the lifting of the device from the Column begins. Therefore, the electromagnet 6 rises up, moving past the dimensional base 5, while the contacts of the reed switch return to their original position and a current flows through the electromagnet winding by the contact of the relay K1.

At the moment when the magnet 11 of the electromagnet 6 is in the position indicated in Fig. 3b, the contacts of the reed switch 12 are closed, the power supply circuit of the electromagnet 7 is de-energized and, due to the K2 relay, the power supply of the electromagnet 6 is energized. column, and electromagnet 6 is attracted to it. Moreover, these operations occur when the device is constantly moved upwards. In this position, the movement of the measuring base 5 relative to the stationary electromagnet 6 begins until the device takes the form shown in FIG. As seen,

This position is identical to that shown in Fig. 3a, therefore, the operation is repeated in this position, i.e. at the same time, the electromagnet 7 is attracted to the column, and the electromagnet 6 is freed from it. Thus, the marking of the pipe string by magnetic marks occurs at a certain known distance, equal to A, and defined as the size between the midpoints of the electromagnets at their fixed position. Plots of residual magnetization of a pipe string resulting from the magnetic interaction of the material of the column with the field of an electromagnet represent a magnetic label relative to which geophysical data can be reconciled during depth surveys. When marking the column, the displacement cycles are calculated, i.e. Counting distances A.

The depth measurement accuracy of the well is determined mainly by two

064334

factors. The first is the speed of the control circuit, the second is the accuracy of the response of the reed switch from the magnetic field. The speed of the circuit is determined by the speed of the relay and is 1-0.5 ms. With an average lifting speed of V 720 m / h, the error in the installation of the electromagnet will be 0.2-0.5 mm. The accuracy of the operation of the reed switch depends on its dynamic properties and ranges from 0.5 to 1 point. The absolute markup error is defined as the rms value of the solutions indicated by Γ and does not exceed +1.5 mm.

.-G

.2

f o

Claims (2)

1. DEVICE FOR MEASURING THE DEPTH OF THE WELL, containing a pipe string, a housing on a geophysical cable, a measuring base with two electromagnets, one of which is installed at one end of it, a power supply of electromagnets and a pulse counter, characterized in that, in order to increase reliability in operation, it is equipped with a bracket mounted on the case with a block through which the cable is thrown and two reed switches, while the measuring base at the ends is made with two movement stops on which the reed switches are installed, the first electromagnet is fixed on the lower movement limiter , and the second is mounted for movement along the measuring base, with one end of the cable attached to the upper limit, the reader, and the other to the second electromagnet and the reed switches are connected to the power supply circuit Omagnets. 2. The device according to π.1, which is based on the fact that the outer radius of the electromagnets is equal to int. The radius of the pipe. „511„ 1206433 > 1 1206433 2