SU132731A1 - Position indicator of the electromagnetic switch of the downhole tool - Google Patents

Description

The proposed device is intended for remote control of a tenloysky geophysical borehole device used to conduct electrical logging of single-core armored cable in deep wells with heavy and viscous drilling mud at a temperature of -40, + 200 °.

It is known to use a single com: device in the well; equipment operating on a single-core cable for connecting various measurement systems and attenuating their signals. This equipment does not provide the induction of the position of the switch and control of its operation. A known circuit for indicating the position of a commutator is by measuring the magnitude of the key switch into one of the contact fields of the last resistance. Such schemes require a dual switch.

The proposed device does not have AUC:;: 111kkih deficiencies and can be used in commercially available ground-based geophysical equipment (for example, the laboratory OKS-56).

The proposed device (see drawing) includes the following elements: CA - meter; and amplifying detector circuit, Tpi autotransformer. reading probing signal probes, Tpz - transformer) changing the detection range, Tp - power transformer for 5 supply amplifier amplification circuit, Other - choke, blocking the output of the amplifying detector circuit on the iremein current, Cj - a capacitor transitional, blocking the supply electrodes of measuring installations (probes) with direct current, P - a relay of a solenoid type with a rotary wheel, D - a planar diode (for example, a silicon diode D-201), blocking the relay circuit R Io constant Khodnev current, € 2 - electrolytic capacitor (e.g., tantalum) shuitiruyu.schy diode D ac, / 7 -mnogoplatny switch settings and measuring masschtabov recording.

No. 1327312 n - indicator counter-rules, P- - switch, which switches on indication indicators.

The circuit of the control point (equipment OKS-56), which is located on the surface, includes: Р „-registration device, Ф -filter, blocking the recording device by alternating current, G - electronic alternator, 02 - filter, blocking electronic generator for a current, B is an electronic rectifier, I: 5 is a direct current switch,, and s is the resistance in the arms of the ohmmeter bridge, JN is a milliammeter in the diagonal of the ohmmeter bridge, Rs is the variable resistance to compensate for temperature changes in the relay coil resistance.

When setting the switch I to the position aa an electronic generator /, a constant voltage is applied to supply it to the anode circuit. From the electronic generator, the ripple current enters the downhole device p through the transition capacitor Ci and enters the supply electrodes of the measuring systems (probes). From the measuring electrodes, the signal is applied to the attenuator of the signals of the probes Tr and then to the trapeformer to change the limits of registration. In this case, the electrodes that are included in this measuring installation, the output corresponding to this installation on the attenuator of the probe probes, are connected to two adjacent contacts of the corresponding switch boards.

Thus, in the two adjacent positions of the switch P, the same probe is turned on, and in the next position of the switch the next probe is turned on.

In the first of two adjacent positions, corresponding to the given STOCK installation, the winding is turned on on the transformer of the change of the limits of the T-2 register, and in the second - a part of the winding.

Thus, the connection of different measurement settings and the change of registration limits are made in the projectile using a single switch and eliminates the need to use relay control circuits.

The amplified signal is rectified and assigned to the recording device P at the control point. The separation of the constant and interline current on the surface is achieved by applying the filter system Ф) and Фг. In order to avoid shunting of the output of its amplifier-detector circuit by a circuit of a relay, a diode D is used, which is used as unipolar resistance. Winding relay P, which has a high inductance, attenuates the alternating current in the relay circuit. The electrolytic capacitor Cr of a large capacitance bypasses the diode D in alternating current, eliminating the interference from the alternating current rectified by the diode. The use of an electrolytic capacitor in an ac circuit is possible due to the presence of a polarizing voltage. When the Yaz switch is set to position 6, a constant voltage is applied to the wellbore on the relay coil. When the relay operates, the ratchet mechanism moves the switch P by one contact. Resistance RI and R and the active resistance of the relay coil are included in the position indication system of the commutator with an ohmmeter. Soirotivleiis R, is designed to monitor temperature variations of the resistance of the relay winding.

As soon as the trigger current required to hold the core in the trigger position can be significantly reduced. Therefore, the connection of a sequence of winding relays RI and Rz does not reduce the useful power of the electric motor. The connection of the resistances RI and RZ is made by a moving contact of the non-switch H2, mounted on the relay core and does not require an additional drive.

With the described method of switching on the indicator resistance, the engine power does not depend on the presence of the indication system, which allows reducing the power dissipated in the projectile and reducing the magnetizing effect of the DC pulses. Connecting the indication resistances to the relay coil in succession makes it possible to compensate for changes in the resistance of the relay coil, and using one resistance (Re). The use of a single switch eliminates the need for a relay control circuit and allows the use of a direct current stepper motor. The use of a switching system and an indication of the switch positions on the wired current greatly simplifies the design of the device, eliminating the need for complex separation devices containing high-capacity capacitors.

Subject invention

The position indicator of the electromagnetic switch of the downhole device by fixing the value of indicator resistances included in one of the contact fields of the switch, is different from that it is made in the form of a self-blocking contact, an electromagnet that includes the contact field in its power supply .

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