CN201714377U - Controllable signal emitter capable of being loaded with pseudorandom code - Google Patents

Abstract

A controllable signal transmitter capable of loading pseudo-random codes for oil field exploration, including an output circuit, an output signal control circuit, a frequency and/or time-domain signal generation circuit, and an emitter; wherein the pseudo-random code generation unit generates pseudo-random codes And transmitted to the central controller, processed by the central controller and transmitted to the output signal control circuit, the output signal control circuit adds the processed pseudo-random code to the control signal of the output circuit to form a pseudo-random code control signal and send it to the emitter . The output signal control circuit can also receive the frequency and/or time domain signal generated by the frequency and/or time domain signal generation circuit and add it to the control signal of the output circuit; therefore, the transmitter can transmit three kinds of signals, and the use is very flexible. After the unique pseudo-random coding control signal of the utility model is loaded into the formation, only this pseudo-random signal can be received at the receiver end, so as to avoid the interference of other signals and achieve the purpose of clearly distinguishing deep low-resistance abnormal bodies.

Description

A controllable signal transmitter capable of loading pseudo-random codes

technical field

The utility model relates to the technical field of oil field exploration, in particular to a controllable signal transmitter capable of loading pseudo-random codes, which is mainly used in the process monitoring of fracturing, water injection, and profile control in oil field exploration and development, and can be used during construction according to needs. Pseudo-random coded high-power controllable electric field signals are loaded into the formation.

Background technique

Oil and gas production wells basically require fracture azimuth monitoring after fracturing operations, and deep gas wells also need fracturing fracture monitoring. At present, when the electrical receiver used in oilfield exploration and development tests the artificial potential field on the ground, it cannot extract weak electrical signals due to the strong interference background. Make the instrument reach the measurement accuracy of microvolt level. The existing transmitting instruments use frequency domain or time domain signal transmission, and the influence of interference signals cannot be eliminated during the acquisition process. The controllable signal transmitter is used together with the electrical signal receiver (a patent has been applied for separately).

Utility model content

The purpose of this utility model is to provide a controllable signal transmitter capable of loading pseudo-random codes, which can eliminate the interference background when deep in the well and test the artificial electric field on the ground during oilfield exploration and development, so that the ground receiving equipment can achieve clear The purpose of distinguishing deep low-resistance abnormal bodies.

The technical scheme that realizes the utility model purpose is:

1. A controllable signal transmitter capable of loading pseudo-random codes, used for oil field exploration, at least including:

an output circuit, an output signal control circuit, a frequency signal generating circuit and/or a time domain signal generating circuit, and an emitter;

Wherein the output signal control circuit is connected with the output circuit, the frequency signal generating circuit and/or the time domain signal generating circuit, and receives the frequency signal generated by the frequency signal generating circuit and/or the time domain signal generating circuit and/or or a time-domain signal, and add the frequency signal and/or time-domain signal to the control signal of the output circuit to form a control signal and transmit it to the target through the emitter;

Wherein the controllable signal transmitter also includes a central controller and a pseudo-random code generation unit, which is connected to the output signal control circuit, and the pseudo-random code generation unit generates a pseudo-random code and transmits it to the central controller, Processed by the central controller and transmitted to the output signal control circuit, the output signal control circuit adds the processed pseudo-random code to the control signal of the output circuit to form a pseudo-random code control signal to send to the emitter.

2. The controllable signal transmitter also includes an external synchronization interface connected to the output signal control circuit, receiving the pseudo-random code processed by the central controller and transmitting it to the output signal control circuit.

3. The pseudo-random coded control signal is a square wave DC power signal.

4. The pseudo-random code generation unit includes a computer and a level conversion circuit, and the central controller includes a single-chip microcomputer and a communication circuit;

The pseudo-random code sent by the computer is transmitted to the single-chip microcomputer by the level conversion circuit, processed by the single-chip microcomputer and converted into a voltage change signal, and then sent by the communication circuit to the external synchronous interface. The above output signal control circuit.

5. The model of the single-chip microcomputer is C8051F236, and the voltage change signal converted and generated by the single-chip microcomputer is a ±5V voltage change signal; the communication circuit adopts a MAX485 circuit, and the level conversion circuit adopts a MAX232 circuit.

6. The pseudo-random code generated by the pseudo-random code generating unit is 15 bits.

7. The MAX232 circuit and the MAX485 circuit are driven and communicated through a serial port.

8. The output signal control circuit includes an IGBT drive circuit and a signal output circuit.

The utility model has positive effects:

The controllable signal transmitter capable of loading pseudo-random codes of the utility model can transmit three kinds of signals: pseudo-random code control signals, time-domain signals or frequency-domain signals. Understand the geological structure and provide a high-power controllable signal source, especially after the high-power controllable electric field signal of the unique pseudo-random code of the utility model is loaded to the formation, only this pseudo-random signal can be received at the receiver end, thereby avoiding other signals In order to achieve the purpose of clearly distinguishing low-resistivity anomalies in deep formations, it solves problems such as fracture azimuth monitoring of oil field fracturing wells, water flooding range monitoring of water injection wells, profile control effect evaluation of profile control wells, and steam flooding range of steam flooding wells.

Description of drawings

Fig. 1 is the circuit functional block diagram of the controllable signal transmitter of the utility model that can load pseudo-random coding;

Fig. 2 is the functional block diagram of the central controller of an embodiment of the present utility model;

Fig. 3 is the detailed circuit diagram of the central controller of an embodiment of the utility model;

Fig. 4 is the detailed circuit diagram of the external synchronization interface of an embodiment of the present invention;

Fig. 5A is a detailed circuit diagram of an IGBT drive circuit of an embodiment of the present invention;

Fig. 5B is a detailed circuit diagram of the signal output circuit of an embodiment of the present invention;

Fig. 6 is the detailed circuit diagram of the time domain signal circuit of an embodiment of the present invention;

FIG. 7 is a detailed circuit diagram of a frequency domain signal circuit according to an embodiment of the present invention.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and by taking the specific implementation as an example. However, those skilled in the art should know that the utility model is not limited to the specific embodiments listed, as long as it conforms to the spirit of the utility model, it should be included in the protection scope of the utility model.

The principle of the utility model is: in addition to transmitting conventional time-domain and/frequency-domain signals to the measured target, it can also transmit pseudo-randomly coded control signals, and the control signals of three different modes control the high-voltage transmitting power supply through the signal output control unit , so that the transmitting power signal becomes a high-voltage time-domain and/or frequency-domain signal consistent with them, or a pseudo-randomly coded control signal. This high-voltage signal can be loaded to the formation as required during the construction process. After the unique pseudo-random coded high-power controllable electric field signal of the utility model is loaded to the formation, only this pseudo-random signal can be received at the receiver end, thereby avoiding the interference of other signals and achieving the purpose of clearly distinguishing deep low-resistance abnormal bodies . Therefore, the innovation of this utility model is to use the external synchronization interface to introduce a pseudo-random signal consistent with the receiving end to control the transmitting power signal, so that the transmitting signal is consistent with the receiving signal, eliminating the interference of random signals, while retaining the original technology. time and frequency domain signals.

Please refer to Fig. 1, it is the function principle block diagram of the controllable signal transmitter that can load the pseudo-random code of the present utility model; In one embodiment, the working power supply is 220v, 50Hz alternating current, which is processed by the rectification and filtering circuit 200 to generate a DC power signal, and then transmitted to the voltage regulation circuit 300, the function of the voltage regulation circuit 300 is to shift the phase, and finally generate a linear DC power supply The signal is sent to the output circuit 400, and after being processed by the output circuit 400, a specific pseudo-random coded control signal is sent to the transmitter 500. The pseudo-random coded control signal is a square wave DC power signal, and finally transmitted by the transmitter 500 to the tested Target.

In a traditional controllable signal transmitter, an output signal control circuit 600 is generally connected to the output circuit 400 for receiving the frequency signal and/or time signal transmitted by the frequency signal generation circuit 603 and/or the time domain signal generation circuit 604. domain signal, and then add the frequency signal and/or time domain signal to the control signal of the output circuit 400 to form a high voltage time domain control signal and/or high voltage frequency domain signal consistent with the frequency signal and/or time domain signal The control signal is transmitted to the emitter 500, and the emitter 500 loads the high-voltage time-domain control signal and/or the high-voltage frequency-domain signal to the formation according to actual needs during the construction process. Each circuit unit in the above process is well known to those skilled in the art, as shown in Figure 6 is a detailed circuit diagram of the time domain signal circuit of an embodiment of the present invention; Figure 7 is a detailed circuit diagram of the frequency domain signal circuit of an embodiment of the present invention The circuit diagram will not be repeated.

As shown in Figure 5A and Figure 5B, in the utility model, the output signal control circuit 600 includes two parts of the IGBT drive circuit and the signal output circuit, wherein Figure 5A is a detailed circuit diagram of the IGBT drive circuit of an embodiment of the utility model; output The stage uses IGBT high-power field effect devices, and the control of the output current uses a constant current and constant voltage control module to complete the tracking and adjustment of the output current. The generation of time domain and frequency domain signals adopts integrated circuit precision oscillator and precision frequency divider, and the frequency accuracy can reach 1/10 ⁶ . The system output frequency, time accuracy and stability are greatly improved. For the high-order and low-order harmonics of the output current, the inductor and capacitor are used to form a π-type filter to meet the filtering effect. Fig. 5B is a detailed circuit diagram of the signal output circuit of an embodiment of the present invention; using these two parts of the circuit can realize low power control high power, after the high voltage direct current output by the voltage regulating circuit 300 is loaded with a pseudo-random code, the emitter 500 will This control signal loaded with a random coded signal is transmitted to the underground geological body to be measured.

The utility model can load the controllable signal transmitter of pseudo-random code, in addition to the frequency signal generation circuit 603 and/or the time-domain signal generation circuit 604, a central controller 700 and a pseudo-random code are also connected to the output signal control circuit 600 Code generation unit 710, the function of pseudo-random code generation unit 710 is to generate different pseudo-random codes according to the requirements of measurement accuracy and transmit them to the central controller 700. The longer the number of pseudo-random codes, the higher the measurement accuracy. The function of the central controller 700 is to convert the pseudo-random code into a signal with a voltage change of ±5V, and transmit it to the output signal control circuit 600 . In one embodiment, as shown in FIG. 2, the central controller 700 adopts a single-chip microcomputer C8051F236, and the pseudo-random code generation unit 710 is served by a computer, which generates a 15-bit pseudo-random code sequence: {A15}=1000100110101111000100110101111..., the After the pseudo-random code passes through the MAX232 level conversion circuit 705 and the central controller 700, it is processed and transformed into a signal with a voltage change of ±5V, and then transmitted to the output signal control circuit 600 through the communication circuit. After being processed by the output circuit 400, a specific pseudo-random code control signal is formed to the transmitter 500. The pseudo-random code control signal is a square wave DC power signal, and finally the transmitter 500 transmits it to the target to be tested.

In a preferred embodiment of the present invention shown in FIG. 2 above, the central controller 700 includes a MAX485 communication circuit, which is responsible for sending the ±5V voltage change signal generated by the single-chip microcomputer C8051F236. The MAX485 communication circuit sends signals through the synchronous interface 720 on the controllable signal transmitter of the present invention. FIG. 4 is a detailed circuit diagram of the external synchronization interface 720 of an embodiment of the present invention.

In a specific embodiment, the MAX485 communication circuit adopts the MAX485 interface chip, which is a kind of RS-485 chip of Maxim Company, which adopts a single power supply +5V work, and the rated current is 300μA. It adopts a half-duplex communication mode, and it completes the The function of TTL level conversion to RS-485 level. The structure and pins of MAX485 chip are very simple. It contains a driver and receiver inside. The RO and DI terminals are the output of the receiver and the input of the driver respectively. When connecting, you only need to connect to the RXD and TXD of the single-chip microcomputer; /RE and DE terminals are respectively the enabling terminals for receiving and transmitting. When /RE is logic 0, the device is in the receiving state; when DE is logic 1, The device is in the sending state, because the MAX485 works in the half-duplex state, so it is only necessary to use one pin of the microcontroller to control these two pins; the A terminal and the B terminal are the differential signal terminals for receiving and sending, respectively, when the A pin When the level of the pin is higher than B, it means that the sent data is 1; when the level of A is lower than that of B, it means that the sent data is 0. The wiring is very simple when connecting with the microcontroller. Only one signal is needed to control the receiving and sending of MAX485. At the same time, add a matching resistor between the A and B terminals, generally a 100Ω resistor is optional.

In one embodiment of the present invention, the serial port is used to take power, and the MAX232 and MAX485 can be driven to realize communication. The voltage is 5.16V when no load is added, and it drops to about 3V when the load is added.

The signal sent by the MAX485 communication circuit of the present embodiment is exactly a pseudo-random code control signal, which is used to control the transmitter to send this type of signal, and is accessed by the external synchronization interface 720 when controlling the transmitter; simultaneously use it to control the receiver to only receive this type of signal Signal, so it can eliminate external interference signals and improve the accuracy of the instrument.

The controllable signal transmitter capable of loading pseudo-random codes of the utility model, in addition to transmitting conventional time domain and/frequency domain signals to the measured target, can also transmit pseudo-random code control signals, which is flexible in use and can be used for electrical methods. Exploration, looking for deep underground geological structures, and understanding geological structures provide high-power controllable signal sources, so that the electrical signals received by the receiver can clearly distinguish deep low-resistance anomalies, and solve the problems of oil field fracturing well fracture azimuth monitoring and water injection well water flooding. Range monitoring, profile control effect evaluation of profile control wells, and steam drive range of steam drive wells.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the invention.

Claims (8)

1. A controllable signal transmitter capable of loading pseudo-random codes for oil field exploration, at least comprising: an output circuit, an output signal control circuit, a frequency signal generating circuit and/or a time domain signal generating circuit, and an emitter; Wherein the output signal control circuit is connected with the output circuit, the frequency signal generating circuit and/or the time domain signal generating circuit, and receives the frequency signal generated by the frequency signal generating circuit and/or the time domain signal generating circuit and/or or a time-domain signal, and add the frequency signal and/or time-domain signal to the control signal of the output circuit to form a control signal and transmit it to the target through the emitter; Its characteristics are: The controllable signal transmitter also includes a central controller and a pseudo-random code generation unit, which is connected to the output signal control circuit, and the pseudo-random code generation unit generates a pseudo-random code and transmits it to the central controller. The central controller processes and transmits to the output signal control circuit, and the output signal control circuit adds the processed pseudo-random code to the control signal of the output circuit to form a pseudo-random code control signal and send it to the emitter. 2. The controllable signal transmitter capable of loading pseudo-random codes as claimed in claim 1 is characterized in that: the controllable signal transmitter also includes an external synchronization interface, which is connected with the output signal control circuit and receives The pseudo-random code processed by the central controller is transmitted to the output signal control circuit. 3. The controllable signal transmitter capable of loading pseudo-random codes according to claim 1 or 2, characterized in that: the pseudo-random code control signal is a square wave DC power signal. 4. The controllable signal transmitter capable of loading pseudo-random codes as claimed in claim 1 or 3, characterized in that: said pseudo-random code generation unit includes a computer and a level conversion circuit, and said central controller includes a single-chip microcomputer and communication circuit; The pseudo-random code sent by the computer is transmitted to the single-chip microcomputer by the level conversion circuit, processed by the single-chip microcomputer and converted into a voltage change signal, and then sent by the communication circuit to the external synchronous interface. The above output signal control circuit. 5. the controllable signal transmitter that can load pseudo-random coding as claimed in claim 4 is characterized in that: the model of described single-chip microcomputer is C8051F236, and the voltage change signal that described single-chip microcomputer conversion generates is ± 5V voltage change signal; The communication circuit adopts a MAX485 circuit, and the level conversion circuit adopts a MAX232 circuit. 6. The controllable signal transmitter capable of loading pseudo-random codes as claimed in claim 5, characterized in that: the pseudo-random code generated by the pseudo-random code generation unit is 15 bits. 7. The controllable signal transmitter capable of loading pseudo-random codes as claimed in claim 5 or 6, characterized in that: said MAX232 circuit and said MAX485 circuit are driven and communicated through a serial port. 8. The controllable signal transmitter capable of loading pseudo-random codes according to claim 1, wherein the output signal control circuit includes an IGBT drive circuit and a signal output circuit.

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