CN103628862B - High-power signal emission source and monitoring method for dynamic monitoring of oilfield remaining oil by potential method - Google Patents

Abstract

The present invention relates to signal emitting-source and the monitoring method of a kind of potentiometry dynamic monitoring oil field remaining oil, generating set provides the 50Hz three-phase alternating current of 30KW to main control unit, main control unit is to be connected with square wave output unit by GPS time service synchronization module, radio synchronization module and wire control synchronous module synchronized control circuit control unit and regulating circuit unit, regulating circuit unit is connected with A/D collecting unit through current acquisition unit, and generating set connects and composes with regulating circuit unit.Using GPS, high frequency radio and line traffic control triggering mode, to facilitate user to select according to actual test case, particularly radio synchronization pattern can be effectively prevented from GPS and is affected by the external environment and the problem that produces, it is achieved that main control unit Remote；Signal synchronism output is realized by GPS time service synchronization, radio synchronization and the three kinds of methods of synchronization of wire control synchronous arranged in main control unit.There is volume little, lightweight, cheap, the advantage such as easy construction.

Description

High-power signal emission source and monitoring method for dynamic monitoring of oilfield remaining oil by potential method

technical field

The invention relates to a ground potential measurement method and a monitoring method, in particular to a high-power signal emission source suitable for potential measurement under complex test environments such as high background electric noise and a method for dynamically monitoring remaining oil in an oilfield.

Background technique:

Petroleum is a non-renewable energy, and oil recovery is not only a concern of the petroleum industry, but also the whole society. Oil extraction is divided into three stages. Primary oil recovery relies on formation energy for self-spray production, and its output accounts for about 15% to 20% of the total reserves. After the formation energy is released, artificial water injection or gas injection is used to supplement the energy of the reservoir, so that the crude oil can be continuously extracted, which is called secondary oil recovery. The recovery rate of secondary oil recovery is 15% to 20%. After several decades of secondary oil recovery, the remaining oil is trapped in the sandstone pores in the form of discontinuous oil blocks. At this time, the water content of the produced fluid reaches 85% to 90%, and some even reach 98%. Mining at that time is no longer economically beneficial. Therefore, about 60% to 70% of crude oil can only be exploited by other physical and chemical methods. Such exploitation is called tertiary oil recovery, and it is also called Enhanced Oil Recovery (EOR) abroad. At present, in the tertiary oil recovery stage, some control and flooding technical measures such as water injection, gas injection, strong sulfur injection, and fracturing are usually used in order to improve the recovery rate of crude oil fields.

The dynamic monitoring technology of remaining oil in high water-cut oilfields is an important technical means implemented in the tertiary oil recovery stage. Through this technology, the migration law of oil and water in the reservoir can be dynamically monitored, and the oil-water interface, water flooding and water string in the reservoir can be understood. This technology not only provides important guiding significance for the implementation of tertiary oil recovery technical schemes, but also provides an important scientific basis for rationally and economically formulating high water-cut oilfield development schemes and finding the distribution of remaining oil. With the development of tertiary development methods and technologies for water-bearing oilfields, the real-time monitoring technology of remaining oil has been greatly developed. Geophysical methods such as 4D seismic, well logging, and potential measurement, as well as direct measurement methods such as tracer logging, have been developed successively. Among them, the potential measurement technology has been tested by French scholars in the evaluation of hydraulic fracturing orientation and extension since the end of the 1970s. In the early 1980s, the Sandia Experimental Research Center of the United States began to test and apply coal-derived gas fracturing evaluation. At the end of the 1980s, Japanese scholars carried out preliminary applications in reservoir evaluation of casing geothermal wells and oil and gas production wells. In the late 1990s, electrical measurement technology was widely used in formation evaluation of oil fields, geothermal fields, coal fields, groundwater and underground nuclear waste disposal sites in many foreign countries (the United States, France, Japan, Germany, Indonesia, etc.) . Since the end of the 1990s, a large number of theoretical studies (He Yusheng et al., 1999) and field experiments (Zhang Jincheng, 2001) have been carried out in China. The electrical test technology has been widely used in the water injection propulsion direction of oilfield water injection wells and the fracturing fracture orientation of coalbed methane fields. Applications.

At present, the existing measuring instrument system has been developed from the original single-channel point-by-point measurement method to the multi-channel area measurement method, which makes the technology comprehensively improved in background noise suppression, test efficiency, especially dynamic monitoring, etc., but this The signal source that the method relies on generally has shortcomings such as low transmission power, single frequency, and single synchronization method, which cannot fully meet the requirements of the potential method for the signal source in the dynamic monitoring of remaining oil in oilfields.

Invention content:

The purpose of the present invention is to provide a high-power signal emission source suitable for residual oil monitoring by using the potentiometric method to address the above-mentioned deficiencies in the prior art;

Another object of the present invention is to provide a monitoring method for dynamic monitoring of remaining oil in an oilfield by a potentiometric method.

The purpose of the present invention is achieved through the following technical solutions:

The high-power signal transmitting source for dynamic monitoring of remaining oil in the oil field by the potentiometric method is composed of a generator set 3 and a control unit 4. The generator set 3 provides 30KW 50Hz three-phase alternating current to the control unit 4. The control unit 4 is controlled by GPS timing The synchronization module 7, the radio synchronization module 8 and the wire-controlled synchronization module 9 are connected to the square wave output unit 19 through the synchronization control circuit 10, the control unit 12 and the voltage regulation circuit unit 17, and the control unit 12 is connected to the square wave output unit 17 through the voltage regulation circuit unit 17. The unit 19 is connected to convert the input three-phase alternating current into a custom frequency, cycle number and power square wave signal and output it. The keyboard control circuit 11 and the USB interface circuit 14 are respectively connected with the control unit 12, and the control unit 12 is connected with the liquid crystal display circuit 13 and the The A/D acquisition unit 15 is connected, the voltage regulation circuit unit 17 is connected to the A/D acquisition unit 15 via the current acquisition unit 18 , and the generator set 16 is connected to the voltage regulation circuit unit 17 to form a structure.

A monitoring method for dynamic monitoring of remaining oil in an oilfield by a potential method: comprising the following steps:

a. Distributed parallel potential measurement system 2 and high-power signal emission source system 1 are arranged in the monitoring area to form a test network system, which are connected to their respective trigger ports through synchronization cables to realize signal emission and data acquisition in the synchronous mode of wire control, It can also realize GPS timing synchronization and radio synchronization signal transmission and data collection by connecting their respective GPS antennas and high-gain radios;

b. Connect the generator set 3 with the main control unit 4 in the high-power signal transmitting system 1;

c. Determine the working parameters of the high-power signal transmitting system 1 through on-site experiments, including parameters such as the frequency of the square wave, the number of cycles, and the power supply current, and establish the experimental working parameters in the distributed parallel potential measurement system 2 and perform the work The parameters are imported into the U disk of the peripheral;

d. Insert the U disk loaded with the working parameters into the USB port of the main control unit 4 of the high-power signal transmitting system 1, and the main control unit 4 automatically imports the working parameters into the high-power signal transmitting system 1;

d. Select the same synchronization mode as in the distributed parallel potential measurement system 2 through the keyboard. If the GPS timing synchronization mode is selected, the distributed parallel potential measurement system 2 and the high-power signal transmitting source system 1 will monitor the current GPS status in real time. The next step can only be performed when the GPS status of both is OK; if the radio synchronization method is selected, the distributed parallel potential measurement system 2 and the high-power signal transmitting source system 1 will be verified first, and the next step will be executed after the verification is successful. Operation, if the verification is unsuccessful, select the wire control synchronization mode and directly execute the next step;

e, start the Run button of the main control unit 4 to enter the running mode, and the transmitter is in the waiting mode at this time;

f. The distributed parallel potential acquisition system 2 establishes synchronization with the main control unit 4 through the set synchronization method, and the main control unit 4 starts to transmit square wave signals according to the imported working parameters, so as to realize the data acquisition between the transmitted signal and the distributed parallel potential acquisition system 2 After the current frequency transmission is completed, the main control unit 4 will save the current data collected in the transmission process in the U disk and send it back to the data processing center for data processing, or use radio synchronization to send the current parameters in real time In the distributed parallel potential acquisition system 2, the post-processing of the test data is carried out.

Beneficial effects: the present invention adopts isolation measures to integrate the control part of the main control unit 4 and the high-voltage input and output parts into one box, which greatly increases the integrity of the system, making the system small in size, light in weight, and low in cost. Convenient construction and other advantages. The maximum output power is 50V～125V/25App, and the frequency is a square wave signal with a duty ratio of 1:1 between 0.1Hz and 10KHz. The output power and frequency can be adjusted according to needs. Its advantages are: ① output power, signal frequency and number of cycles can be adjusted according to needs; ② GPS, high-frequency radio and wire-controlled triggering methods are used to facilitate users to choose according to the actual test situation, especially the radio synchronization mode can be Effectively avoid the problems caused by GPS being affected by the external environment, and at the same time can realize the remote control of the main control unit 4; ③With external input and output devices, it can directly import the parameters such as frequency point and cycle number set by the user in advance, and adopt a customized method Control the work of the transmitter and improve the efficiency of field testing. During the collection process, the real-time collected current data will be stored in the device; ④The built-in 16-bit A/D can measure the power supply current in real time and display it on the screen. In the radio synchronization mode, the collected current data will be transmitted wirelessly to Distributed parallel potential acquisition system 2; ⑤ The synchronous output of signals is realized through three synchronization methods of GPS timing synchronization, radio synchronization and wire control synchronization set in the main control unit 4.

Description of drawings:

Fig. 1 Field layout of high-power signal emission source and monitoring method for dynamic monitoring of oilfield remaining oil by potential method.

Fig. 2 is a structural block diagram of the high-power signal transmitting system 1 in Fig. 1 .

Fig. 3 is a structural block diagram of the main control unit 4 in Fig. 2 .

1 high-power signal transmitting source system, 2 distributed parallel potential acquisition system, 3 three-phase 380V50Hz generator set, 4 main control unit, 5 output unit, 6 power supply electrode, 7GPS module, 8 digital radio transceiver module, 9 wire control module, 10 synchronous control circuit, 11 keyboard control circuit, 12C8051F02 control unit, 13 liquid crystal display circuit, 14USB interface circuit, 15A/D acquisition unit, 16 external generator set, 17 voltage regulation circuit unit, 18 current acquisition unit, 19 square wave output unit.

detailed description:

Below in conjunction with accompanying drawing and embodiment the present invention is further described in detail:

The high-power signal transmitting source for dynamic monitoring of remaining oil in the oil field by the potentiometric method is composed of a generator set 3 and a control unit 4. The generator set 3 provides 30KW 50Hz three-phase alternating current to the control unit 4. The control unit 4 is controlled by GPS timing The synchronization module 7, the radio synchronization module 8 and the wire-controlled synchronization module 9 are connected to the square wave output unit 19 through the synchronization control circuit 10, the control unit 12 and the voltage regulation circuit unit 17, and the control unit 12 is connected to the square wave output unit 17 through the voltage regulation circuit unit 17. The unit 19 is connected to convert the input three-phase alternating current into a custom frequency, cycle number and power square wave signal and output it. The keyboard control circuit 11 and the USB interface circuit 14 are respectively connected with the control unit 12, and the control unit 12 is connected with the liquid crystal display circuit 13 and the The A/D acquisition unit 15 is connected, the voltage regulation circuit unit 17 is connected to the A/D acquisition unit 15 via the current acquisition unit 18 , and the generator set 16 is connected to the voltage regulation circuit unit 17 to form a structure.

A monitoring method for dynamic monitoring of remaining oil in an oilfield by a potential method: comprising the following steps:

a. Arrange a distributed parallel potential acquisition system 2 and a high-power signal emission source system 1 in the monitoring area to form a test network system, and connect them to their respective trigger ports through a synchronization cable to realize signal emission and data acquisition in the synchronous mode of wire control. It can also realize GPS timing synchronization and radio synchronization signal transmission and data collection by connecting their respective GPS antennas and high-gain radios;

b. Connect the generator set 3 with the main control unit 4 in the high-power signal transmitting system 1;

c. Determine the operating parameters of the high-power signal transmitting system 1 through on-site experiments, including parameters such as the frequency of the square wave, the number of cycles, and the power supply current, and establish the experimental operating parameters in the distributed parallel potential acquisition system 2. The parameters are imported into the U disk of the peripheral;

d. Insert the U disk loaded with the working parameters into the USB port of the main control unit 4 of the high-power signal transmitting system 1, and the main control unit 4 automatically imports the working parameters into the high-power signal transmitting system 1;

d. Select the same synchronization mode as in the distributed parallel potential acquisition system 2 through the keyboard. If the GPS timing synchronization mode is selected, the distributed parallel potential acquisition system 2 and the high-power signal emission source system 1 will monitor the current GPS status in real time. The next step can only be performed when the GPS status of both is OK; if the radio synchronization method is selected, the distributed parallel potential measurement system 2 and the high-power signal transmitting source system 1 will be verified first, and the next step will be executed after the verification is successful. Operation, if the verification is unsuccessful, select the wire control synchronization mode and directly execute the next step;

e, start the Run button of the main control unit 4 to enter the running mode, and the transmitter is in the waiting mode at this time;

f. The distributed parallel potential acquisition system 2 establishes synchronization with the main control unit 4 through the set synchronization method, and the main control unit 4 starts to transmit square wave signals according to the imported working parameters, so as to realize the data acquisition between the transmitted signal and the distributed parallel potential acquisition system 2 After the current frequency transmission is completed, the main control unit 4 will save the current data collected in the transmission process in the U disk and send it back to the data processing center for data processing, or use radio synchronization to send the current parameters in real time In the distributed parallel potential acquisition system 2, the post-processing of the test data is carried out.

Synchronization control circuit 10, GPS module 7, digital radio transceiver module 8 and line control module 9 jointly constitute three synchronization modes of the system. module to realize the synchronous output of the signal. When the system is in the GPS timing synchronization mode, the system will automatically output the signal synchronously according to the GPS clock and interval time set by the user according to the set signal parameters, and the synchronization error can be controlled within 1 microsecond. When the system is in the radio synchronization mode, the system will receive the frequency, period and other parameters of the radio command control signal sent by the distributed parallel potential acquisition system 2 and realize synchronous output. After the current signal is sent, the current data collected by the transmitter will be passed through The digital radio transceiver module 8 sends to the distributed parallel potential acquisition system 2 to realize the remote operation of the main control unit 4 . The synchronous output of signals is realized through three synchronization modes of GPS timing synchronization, radio synchronization and line control synchronization set in the main control unit 4 . When the system is in the synchronous mode of wire control, a synchronous signal is sent through the cable connecting the distributed parallel potential acquisition system 2 to the system, so as to realize the synchronous output of the set signal parameters.

The keyboard control circuit 11, the C8051F02 control unit 12, the liquid crystal display circuit 13 and the USB interface circuit 14 jointly constitute the input, display and output of the main control unit 4, and the keyboard control circuit 11 can be used to set parameters on the membrane keyboard on the main control unit 4, The liquid crystal display circuit 13 controls the 16×8 dot matrix display set on the panel of the main control unit 4 to display the currently set parameters and the working status of the main control unit 4 . The USB interface circuit 14 controls the USB port of the main control unit 4 , otherwise it reads the working parameters from the USB and stores the current data collected during the working process of the main control unit 4 .

C8051F02 control unit 12, A/D acquisition unit 15, voltage regulation circuit unit 17, and current acquisition unit 18 jointly realize the collection of emission current data of the main control unit 4, and the current acquisition unit 18 obtains signals from the voltage regulation circuit unit 17, Through 16 high-speed A/D acquisition units 15, the current signal is converted into a digital signal, and then displayed on the liquid crystal display of the main control unit 4 in real time by the C8051F02 control unit 12 and the liquid crystal display circuit 13, and the full-time collected by the USB interface circuit 14 simultaneously The domain current signal exists in the U disk of the peripheral.

The C8051F02 control unit 12, the voltage regulating circuit unit 17 and the square wave output unit 19 jointly complete the shaping and output of the square wave signal. The 380V50Hz three-phase AC power input by the generator set is rectified in the voltage regulating circuit unit 17 and stored in the capacitor bank, and converted into a square wave signal by the square wave output unit 19 according to the set working parameters and released to the load to realize the square wave signal. output.

Example 1

a. Arrange the distributed parallel potential acquisition system 2 and the high-power signal emission source system 1 as shown in Fig. 1, and use cables to connect them through their respective trigger ports to realize signal emission and data acquisition in the synchronous mode of wire control.

b. Connect the generator set 3 with the main control unit 4 in the high-power signal transmitting system 2 .

c. Determine the working parameters of the high-power signal transmitting system 2 through experiments, including parameters such as square wave frequency, cycle number, and supply current, and import the working parameters into the U disk through the host computer of the distributed parallel potential acquisition system 2.

d. Insert the U disk loaded with the working parameters into the USB port of the main control unit 4 of the high-power signal transmitting system 1, and the main control unit 4 automatically imports the working parameters into the high-power signal transmitting system 1;

d. Use the keyboard in the main control unit 4 to select the wire-controlled trigger mode.

e. Start the Run button of the main control unit 4 to enter the running mode, and the transmitter is in the waiting mode at this time.

f. The distributed parallel potential acquisition system 1 triggers the control unit 4 to start transmitting a square wave signal according to the imported working parameters through the synchronization cable, so as to realize the synchronization between the transmitted signal and data acquisition. After the transmission of the current frequency point is completed, the main control unit 4 stores the current data collected during the transmission into the USB disk.

Example 2

a. Arrange distributed parallel potential measurement system 1 and high-power signal transmission system 2 as shown in Figure 1, and connect high-gain radio antennas to their respective radio antenna ports to realize signal transmission and data acquisition in radio synchronization mode.

b. Connect the generator set 3 with the main control unit 4 in the high-power signal transmitting system 2 .

c. Determine the power supply current parameters of the high-power signal transmitting system 2 through experiments.

d. Use the keyboard in the main control unit 4 to select the radio control trigger mode, and start the Run key of the main control unit 4 to enter the running mode. At this time, the main control unit is under the control of the distributed parallel potential acquisition system 2 host.

d. The distributed parallel potential acquisition system 2 performs radio communication verification with the main control unit 4. If the verification is successful, the working parameters are sent to the main control unit 4 through radio coding. After the main control unit 4 decompiles and works Start outputting the signal, thereby achieving synchronization between the transmitted signal and data acquisition. After the transmission of the current frequency point is completed, the main control unit 4 stores the current data collected during the transmission process in the U disk, and at the same time transmits the current data collected by the main control unit 4 back to the distributed parallel potential acquisition system 2 in the form of radio coding middle.

Example 3

a. Arrange distributed parallel potential acquisition system 2 and high-power signal transmission system 1 as shown in Figure 1, and connect GPS antennas to respective GPS ports to realize signal transmission and data acquisition in GPS timing synchronization mode.

b. Connect the generator set 3 with the main control unit 4 in the high-power signal transmitting system 1 .

c. Determine the working parameters of the high-power signal transmitter through experiments, including parameters such as the frequency of the square wave, the number of cycles, and the power supply current, and import the working parameters into the U disk through the host computer of the distributed parallel potential acquisition system 2.

d. Insert the U disk loaded with the working parameters of the transmitter into the USB port of the main control unit 4, and the main control unit 4 will automatically import the parameters into the main control unit 4.

d. Utilize the keyboard in the main control unit 4 to select the GPS trigger mode. At this time, the main control unit 4 starts to collect and display GPS data in real time. If the GPS satellites are in good condition, the main control unit 4 sets the triggering time and the adjacent two by the membrane keyboard. The time interval between the first and second transmissions, if the satellite status is not good, the main control unit will keep collecting GPS data.

e. Start the Run button of the main control unit 4 to enter the running mode. When the GPS time is equal to the set trigger moment, the main control unit 4 will output a square wave signal. After the current launch process is over, the main control unit 4 will enter GPS data collection again process, and will automatically determine the next launch time according to the launch interval.

f. The host of the distributed parallel potential acquisition system 1 also needs to set the GPS trigger time and the time interval between two adjacent acquisitions. When the set acquisition time is the same as the GPS real-time acquisition clock, it starts to collect data, so that the GPS absolute time is Synchronization between transmitting signal and data acquisition can be realized. After the transmission of the current frequency point is completed, the main control unit 4 stores the current data collected during the transmission into the USB disk.

Claims (1)

1. A monitoring method of a high-power signal transmitting source for dynamic monitoring of remaining oil in an oilfield by a potential method, wherein the high-power signal transmitting source for dynamically monitoring remaining oil in an oilfield by a potential method is composed of a generator set (3) and a main control unit (4) , the generator set (3) provides the 50Hz three-phase alternating current of 30KW to the main control unit (4), and the main control unit (4) is composed of a GPS timing synchronization module (7), a radio synchronization module (8) and a line control synchronization module (9 ) is connected to the square wave output unit (19) through the synchronous control circuit (10), the control unit (12) and the voltage regulating circuit unit (17), and the control unit (12) is connected to the square wave output unit through the voltage regulating circuit unit (17) (19) connect and convert the input three-phase alternating current into customized frequency, cycle number and power square wave signal and output, keyboard control circuit (11) and USB interface circuit (14) are connected with control unit (12) respectively, control unit ( 12) are respectively connected with the liquid crystal display circuit (13) and the A/D acquisition unit (15), the voltage regulating circuit unit (17) is connected with the A/D acquisition unit (15) through the current acquisition unit (18), and the generator set (3 ) is connected with the voltage regulating circuit unit (17); it is characterized in that, comprising the following steps: a. Arrange a distributed parallel potential acquisition system (2) and a high-power signal emission source system (1) in the monitoring area to form a test network system, which is connected to their respective trigger ports through a synchronization cable to realize signal emission in a wire-controlled synchronization mode And data acquisition, and can also realize GPS timing synchronization and radio synchronization signal transmission and data acquisition by connecting their respective GPS antennas and high-gain radios; b. Connect the generator set (3) with the main control unit (4) in the high-power signal transmitting source system (1); c. Determine the operating parameters of the high-power signal transmitting source system (1) through on-site experiments, including the frequency, cycle number and power supply current parameters of the square wave, and establish the experimental operating parameters in the distributed parallel potential acquisition system (2) And import the working parameters into the U disk of the peripheral; d. Insert the U disk loaded with working parameters into the USB port of the main control unit (4) of the high-power signal transmitting source system (1), and the main control unit (4) will automatically import the working parameters into the high-power signal transmitting In the source system (1); e. Select the same synchronization mode as in the distributed parallel potential acquisition system (2) through the keyboard. If the GPS timing synchronization mode is selected, the distributed parallel potential acquisition system (2) and the high-power signal emission source system (1) will be real-time Monitor the current GPS state, and proceed to the next step until the GPS states of both are OK; if the radio synchronization method is selected, the distributed parallel potential acquisition system (2) and the high-power signal transmitting source system (1) will firstly carry out Verify, if the verification is successful, execute the next step; if the verification is unsuccessful, select the wire control synchronization method to directly execute the next step; f. Start the Run button of the main control unit (4) to enter the running mode, and the transmitter is in the waiting mode at this time; g. The distributed parallel potential acquisition system (2) establishes synchronization with the main control unit (4) through the set synchronization method, and the main control unit (4) starts to transmit square wave signals according to the imported working parameters, so as to realize the transmission signal and the distributed parallel The potential acquisition system (2) synchronizes data acquisition. After the current frequency point transmission is completed, the main control unit (4) stores the current data collected during the transmission process in the U disk and sends it back to the room to the data processing center for data processing. Alternatively, if radio synchronization is adopted, the current parameters are sent to the distributed parallel potential acquisition system (2) in real time for post-processing of test data.