CN107524436B - Multiplexing device for underground measurement cable through casing and working method thereof - Google Patents
Multiplexing device for underground measurement cable through casing and working method thereof Download PDFInfo
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- CN107524436B CN107524436B CN201710534628.3A CN201710534628A CN107524436B CN 107524436 B CN107524436 B CN 107524436B CN 201710534628 A CN201710534628 A CN 201710534628A CN 107524436 B CN107524436 B CN 107524436B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/20—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current
- G01V3/22—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current using dc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Abstract
The utility model relates to a multiplexing device of a measurement cable under a sleeve pipe and a working method thereof, wherein the multiplexing device of the measurement cable under the sleeve pipe adopts a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable to be connected with a ground system and an underground instrument through a power supply transformer, and the adjustable alternating current of the ground system is converted into direct current and provided for the underground instrument; the fifth cable core and the sixth cable core of the seven-core cable are connected with a ground communication control system and an underground communication control system through a communication transformer to transmit communication signals between the ground system and an underground instrument, and are used as alternating current power supply transmission cables of the motor; and a seventh cable core of the seven-core cable is adopted to connect the wellhead with the underground voltage acquisition board, so that reference U electrode signals are transmitted. Because the cable core number of the seven-core cable is limited, the cable core can be multiplexed by the power supply and the signals, and the signals can be transmitted on the seven-core cable and supplied to the underground instrument by skillfully connecting all loops by utilizing the balance principle, so that the balance power supply is achieved by utilizing phantom power supply.
Description
Technical Field
The utility model relates to the field of well communication systems in casing resistivity logging technology, in particular to a casing underground measurement cable multiplexing device and a working method thereof.
Background
The logging cable is used for logging, perforating, coring and other operations of various oil and gas wells, can also be used for measuring various parameters underground in the aspects of water conservancy hydrologic measurement, coal field geological exploration, geothermal logging and the like, and is a connecting line for hanging weight connection and transmission of measurement data between a ground system and underground instruments.
The logging cable is used for conveying various downhole instruments, transmitting various signals between a surface control system and the downhole instruments and acquiring depth positions of downhole information, and is commonly used as a seven-core cable.
At present, the existing seven-core cable in the sleeve is provided with four cores for large-current transmission, one core is a ground reference signal U, the other core is a 150V power supply and communication multiplexing, and the other core is a motor and electromagnetic valve power supply line. When the instrument works, firstly, the motor works, the probe is released, then the instrument sends large current to collect data, finally, the large current is closed, then, data transmission with the ground is carried out, and the collected data information is transmitted to the ground system. The collection of the instrument and the data transmission are carried out separately, and meanwhile, the power supply is required to carry out filtering treatment through a large capacitor after entering the instrument, and the use temperature of the instrument is limited due to the existence of the capacitor. The cable in the sleeve has the defects in the prior art that:
1. the system efficiency is lower and the test time is long;
2. the effect of immediate picking and transmission cannot be realized when the instrument works;
3. the influence of the emitted large current on the acquisition signal is excessive;
4. the filter capacitor capacity of the direct current power supply greatly increases the manufacturing cost and limits the use temperature of the instrument.
In the prior art in the field, china patent publication No. CN201835827U discloses a multiplexing device of a petroleum logging cable core, which is used for data transmission and system power supply between ground equipment and underground instruments, but the structure and effect of the device can not meet the current use requirements.
Disclosure of Invention
In order to solve the technical problems of the prior art of a through-casing underground measurement cable, the utility model provides a multiplexing device of the through-casing underground measurement cable and a working method thereof, wherein 5 th and 6 th cable cores of a seven-core cable are utilized for communication and transmitting power of a motor, 1 st, 2 nd, 3 rd and 4 th cable cores of the seven-core cable are utilized for transmitting large current and simultaneously providing working power for all circuit boards in the pit, 7 th cable cores of the seven-core cable are utilized as U reference voltage, the number of cable cores is limited, when the seven-core cable is utilized for transmission, the power supply and the information transmission need to share the cable cores, and the power supply and the signals can multiplex the cable cores due to different frequencies of the power supply and the data signals, and by utilizing a balance principle, all loops are skillfully connected, so that the signals can be transmitted on the seven-core cable and the underground instrument can be supplied with power by utilizing a phantom power supply mode to achieve balance power supply.
In order to achieve the above purpose, the present utility model adopts the following technical scheme.
Firstly, the utility model discloses a multiplexing device for underground measurement cables through a casing.
According to the through-casing underground measurement cable multiplexing device, a seven-core cable is used as a power supply cable of a ground system and underground instruments and used for providing a working power supply for collecting and transmitting data of the underground instruments, and a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable are connected with the ground system and the underground instruments through a power supply transformer and used for converting adjustable alternating current of the ground system into direct current and providing the direct current for the underground instruments; the fifth cable core and the sixth cable core of the seven-core cable are connected with a ground communication control system and an underground communication control system through a communication transformer to transmit communication signals between the ground system and an underground instrument, and are used as alternating current power supply transmission cables of the motor; and a seventh cable core of the seven-core cable is connected with the wellhead and the underground voltage acquisition board to transmit reference U-electrode signals.
Preferably, the ground system adopts a first alternating current power supply panel to provide adjustable alternating current, is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and is used for transmitting the adjustable alternating current through the first cable core, the second cable core, the third cable core and the fourth cable core.
In any of the above technical solutions, preferably, the downhole tool obtains the adjustable alternating current from the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable through the power supply transformer, and obtains the direct current through the AC/DC conversion unit.
In any of the above embodiments, it is preferable that the first ac power supply panel is disposed on a secondary coil side of the power supply transformer.
In any of the above embodiments, it is preferable that the first cable core, the second cable core, the third cable core, and the fourth cable core are connected in parallel to a primary coil side of the power supply transformer, respectively.
In any of the above embodiments, preferably, the AC/DC conversion unit includes a rectifier bridge and a filter module.
In any of the above technical solutions, preferably, the first AC power supply panel outputs an adjustable AC power of 50HZ, the adjustable AC power of 50HZ is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and the first cable core, the second cable core, the third cable core and the fourth cable core transmit the adjustable AC power to the AC/DC conversion unit to perform AC/DC conversion, so as to provide 60-180V DC power for the downhole instrument.
In any of the above technical solutions, preferably, the ground system is provided with a current source panel, and the ground system is connected to the current source panel through a single current line.
In any of the above technical solutions, preferably, the downhole tool is provided with a current conversion plate, and the downhole tool is connected with the current conversion plate through a single current line.
In any of the above embodiments, it is preferable that the power supply transformer is provided with two primary coils and one secondary coil, and parameters of the two primary coils are symmetrical.
In any of the above technical solutions, preferably, the power supply transformer includes a core, a coil, and a lead wire, and the lead wire includes six primary coil leads and two secondary coil leads.
In any of the above technical solutions, preferably, the ground system adopts a second ac power supply panel to provide adjustable ac power, uses a cable cover of a seven-core cable as a loop, transmits the adjustable ac power to a downhole motor and a hydraulic valve power supply switching circuit board, and provides working power for a motor or an electromagnetic valve.
In any of the above embodiments, preferably, the adjustable ac frequency output by the second ac power supply panel is 50HZ.
In any of the above technical solutions, preferably, the ground communication control system is connected to the second ac power supply panel through a single current line.
In any of the above technical solutions, preferably, the downhole communication control system is connected to the motor and the hydraulic valve power supply switching circuit board through a single current line.
In any of the above technical solutions, preferably, the ground communication transmitting module and the ground communication receiving module of the ground communication control system couple communication signals to the fifth cable core and the sixth cable core of the seven-core cable through a communication transformer, and the fifth cable core and the sixth cable core of the seven-core cable differentially transmit the communication signals to the downhole communication transmitting module and the downhole communication receiving module of the downhole communication control system.
Secondly, the utility model also discloses a working method of the through-casing underground measurement cable multiplexing device.
The working method of the through-casing underground measurement cable multiplexing device provided by the utility model adopts the through-casing underground measurement cable multiplexing device, and comprises the following steps:
in the operation of a ground system and an underground instrument, the ground system adopts a first alternating current power supply panel to provide 50HZ adjustable alternating current, the 50HZ adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable through a power supply transformer, the first cable core, the second cable core, the third cable core and the fourth cable core transmit the 50HZ adjustable alternating current to the underground instrument, and the underground instrument obtains direct current from the 50HZ adjustable alternating current obtained from the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable through the power supply transformer in a rectifier bridge and a filtering module mode through an AC/DC conversion unit, wherein the power supply range of the direct current is 60-180V;
step two, a large current obtained by inputting a single current wire by a ground system is connected to a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable through a power supply transformer, and a downhole instrument outputs the single current wire in the same mode and is connected to a current reversing plate so as to be a loop;
the ground communication control system differentially transmits communication signals through a fifth cable core and a sixth cable core of the seven-core cable, can simultaneously transmit communication at the moment of transmitting large current, and does not influence the power supply and the communication signal transmission;
step four, a motor of the underground instrument and a power supply switching circuit board of a hydraulic valve are coupled with a fifth cable core and a sixth cable core of the seven-core cable through a communication transformer to transmit alternating current in parallel, and a cable cover is used as a transmission loop;
and fifthly, connecting the wellhead with a voltage acquisition plate under the well through a seventh cable core of the seven-core cable, wherein the seventh cable core of the seven-core cable transmits a reference signal of the U electrode.
According to the through-casing underground measurement cable multiplexing device and the working method thereof, the through-casing underground measurement cable multiplexing device adopts a heptacable as a power supply cable of a ground system and underground instruments and provides a working power supply for acquisition and transmission data of the underground instruments; the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable are connected with a ground system and an underground instrument through a power supply transformer, and the adjustable alternating current of the ground system is converted into direct current and is provided for the underground instrument; the fifth cable core and the sixth cable core of the seven-core cable are connected with the ground communication control system and the underground communication control system through the communication transformer to transmit communication signals between the ground system and the underground instrument, and are used as alternating current power supply transmission cables of the motor; and a seventh cable core of the seven-core cable is connected with the wellhead and the underground voltage acquisition board to transmit reference U-electrode signals. The method comprises the steps that a sleeve resistivity logging operation is conducted through a sleeve underground measurement cable multiplexing device, an adjustable alternating current provided by a first alternating current power supply panel is adopted by a ground system, the adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable through a power supply transformer, the adjustable alternating current is transmitted to an underground instrument through the first cable core, the second cable core, the third cable core and the fourth cable core, and the underground instrument obtains direct current from the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable through the power supply transformer through an AC/DC conversion unit; the ground system inputs a large current obtained by a single current wire and is connected to a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and the underground instrument outputs the single current wire in the same way and is connected to a current reversing plate so as to take the ground as a loop; the ground communication control system differentially transmits communication signals through a fifth cable core and a sixth cable core of the seven-core cable, can simultaneously transmit communication at the moment of transmitting large current, and does not influence the power supply and the communication signal transmission; the motor of the downhole instrument and the power supply switching circuit board of the hydraulic valve are coupled with a fifth cable core and a sixth cable core of the seven-core cable through a communication transformer to transmit alternating current in parallel, and a cable cover is used as a transmission loop; the wellhead is connected with a voltage acquisition plate under the well through a seventh cable core of the seven-core cable, and the seventh cable core of the seven-core cable transmits a reference signal of the U electrode.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
1. the downhole instrument can be picked and transmitted at once, so that the acquisition time of the downhole instrument is shortened, the overlength of the downhole instrument in the downhole is avoided, and the service life of the instrument is prolonged;
2. the use temperature of the downhole instrument is not limited by the filter capacitor, so that the use place of the downhole instrument is wider;
3. the interference of large current on signal transmission during data acquisition is reduced, and the acquired data is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a cable multiplexing device for over-casing downhole measurement according to a preferred embodiment of the device and method for operating the same;
FIG. 2 is a schematic diagram of a C-core power supply transformer wiring of a preferred embodiment of a over-casing downhole measurement cable multiplexing device and method of operation thereof in accordance with the present utility model;
FIG. 3 is a front view of a C-core power supply transformer configuration of a preferred embodiment of a over-casing downhole measurement cable multiplexing device and method of operation thereof in accordance with the present utility model;
FIG. 4 is a side view of a C-core power supply transformer configuration of a preferred embodiment of a over-casing downhole measurement cable multiplexing device and method of operation thereof in accordance with the present utility model;
reference numerals:
1. 2 parts of iron core, 3 parts of coil and lead.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to overcome the problems of the prior art of a casing-passing downhole measurement cable: in the casing resistivity logging process, the ground system has low efficiency and long testing time, the underground instrument cannot realize the immediate acquisition and transmission during working, the influence of the emitted large current on signals is excessive, the filter capacitance capacity of the direct current power supply is excessive, the manufacturing cost is increased, and the use temperature of the underground instrument is limited. The embodiment of the utility model provides a multiplexing device for underground measurement cables through sleeves and a working method thereof, wherein the 1 st, 2 nd, 3 rd and 4 th cable cores of a seven-core cable are utilized to transmit large current and simultaneously provide working power for all underground circuit boards, the 5 th and 6 th cable cores of the seven-core cable are utilized to communicate and transmit power of a motor, the 7 th cable core of the seven-core cable is utilized as U reference voltage, the number of the cable cores is limited, when the seven-core cable is utilized for transmission, the cable cores are shared for power supply and information transmission, and the cable cores can be multiplexed by the power supply and signals due to different frequencies of the power supply and data signals, and the circuits are skillfully connected by utilizing a balance principle, so that the signals can be transmitted on the seven-core cable and the underground instrument can be powered by utilizing a phantom power supply mode to achieve balance power supply.
Example 1
The through-casing underground measurement cable multiplexing device adopts a seven-core cable as a power supply cable of a ground system and underground instruments and adopts the seven-core cable to provide a working power supply for collecting and transmitting data of the underground instruments.
As shown in fig. 1, the through casing downhole measurement cable multiplexing device according to the present embodiment: the first cable core, the second cable core, the third cable core and the fourth cable core (1#, 2#, 3#, 4#) of the seven-core cable are connected with a ground system and an underground instrument through a power supply transformer, and the adjustable alternating current of the ground system is converted into direct current and provided for the underground instrument; the fifth cable core and the sixth cable core (5 # and 6# of the seven-core cable are connected with the ground communication control system and the underground communication control system through the communication transformer to transmit communication signals between the ground system and the underground instrument, and are used as alternating current power supply transmission cables of the motor; and a seventh cable core (7#) of the seven-core cable is connected with the wellhead and the underground voltage acquisition board to transmit reference U-electrode signals.
According to the through-casing underground measurement cable multiplexing device, a ground system adopts a first alternating current power supply panel I to provide adjustable alternating current, the adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core (1#, 2#, 3#, 4#) of a seven-core cable through a power supply transformer, and the adjustable alternating current is transmitted through the first cable core, the second cable core (1#, 2#) and the third cable core and the fourth cable core (3#, 4#); the underground instrument obtains adjustable alternating current from a first cable core, a second cable core, a third cable core and a fourth cable core (No. 1, no. 2, no. 3 and No. 4) of the seven-core cable through a power supply transformer, and obtains direct current through an AC/DC conversion unit; the AC/DC conversion unit comprises a rectifier bridge and a filter module; the first alternating current power supply panel I is arranged on the secondary coil side of the power supply transformer, and the first cable core, the second cable core (1#, 2#) and the third cable core and the fourth cable core (3#, 4#) are respectively connected in parallel to the primary coil side of the power supply transformer; the first alternating current power supply panel I outputs adjustable alternating current of 50HZ, and is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core (1#, 2#, 3#, 4#) of a seven-core cable through a power supply transformer, and the first cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#) transmit the adjustable alternating current to an AC/DC conversion unit to perform alternating current/direct current conversion, so that 60-180V direct current power is supplied to underground instruments.
According to the over-casing underground measurement cable multiplexing device, a ground system is provided with a current source panel, and the ground system is connected with the current source panel through a single current wire; the downhole instrument is provided with a current conversion plate, and the downhole instrument is connected with the current conversion plate through a single current wire.
The power supply transformer is provided with two primary coils and one secondary coil, and parameters of the two primary coils are symmetrical; the power supply transformer comprises an iron core, a coil and leads, wherein the leads comprise six primary coil leads and two secondary coil leads.
According to the through-casing underground measurement cable multiplexing device, the ground system adopts the second alternating current power supply panel II to provide adjustable alternating current, and the cable cover of the seven-core cable is used as a loop to transmit the adjustable alternating current to the underground motor and the hydraulic valve power supply switching circuit board so as to provide a working power supply for the motor or the electromagnetic valve; the adjustable alternating current frequency output by the second alternating current power supply panel II is 50HZ; the ground communication control system is connected with a second alternating current power supply panel II through a single current wire; the underground communication control system is connected with the motor and the hydraulic valve power supply switching circuit board through a single current wire; the ground communication transmitting module and the ground communication receiving module of the ground communication control system couple communication signals to a fifth cable core and a sixth cable core (No. 5 and No. 6) of the seven-core cable through a communication transformer, and the fifth cable core and the sixth cable core (No. 5 and No. 6) of the seven-core cable differentially transmit the communication signals to an underground communication transmitting module and an underground communication receiving module of the underground communication control system.
The working method of the over-casing underground measurement cable multiplexing device comprises the following steps:
step one, in the work of a ground system and a downhole instrument, the ground system adopts a first alternating current power supply panel to provide 50HZ adjustable alternating current, the 50HZ adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core (1#, 2#, 3#, 4#) of a seven-core cable through a power supply transformer, the first cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#) transmit 50HZ adjustable alternating current to the downhole instrument, the downhole instrument obtains direct current from the 50HZ adjustable alternating current obtained from the first cable core, the second cable core, the third cable core and the fourth cable core (1#, 2#, 3#, 4#) of the seven-core cable through the power supply transformer in a rectifier bridge and filter module mode, and the power supply range of the direct current is 60-180V;
step two, a large current obtained by inputting a single current wire into a ground system is connected to a first cable core, a second cable core, a third cable core and a fourth cable core (1#, 2#, 3#, 4#) of a seven-core cable through a power supply transformer, and underground instruments output the single current wire in the same manner to be connected to a current reversing plate so as to be a loop;
the ground communication control system differentially transmits communication signals through a fifth cable core and a sixth cable core (No. 5 and No. 6) of the seven-core cable, can simultaneously transmit communication at the moment of transmitting large current, and the power supply and the communication signal transmission are not mutually influenced;
step four, a motor of the underground instrument and a power supply switching circuit board of a hydraulic valve are coupled with a fifth cable core and a sixth cable core (5 # and 6# of a seven-core cable through a communication transformer to transmit alternating current in parallel, and a cable cover is used as a transmission loop;
and fifthly, connecting the wellhead with a voltage acquisition board under the well through a seventh cable core (7#) of the seven-core cable, wherein the seventh cable core of the seven-core cable transmits a reference signal of the U electrode.
The through-casing underground measurement cable multiplexing device and the working method thereof are adopted to perform through-casing resistivity logging operation, 5# cable cores and 6# cable cores of a seven-core cable are utilized to communicate and transmit power of a motor, 1, 2, 3 and 4# cable cores of the seven-core cable are utilized to transmit large current and simultaneously provide working power for all circuit boards in the pit, 7# cable cores of the seven-core cable are utilized as U reference voltage, the number of cable cores is limited, when the seven-core cable is used for transmission, the cable cores are shared for power supply and information transmission, and because the frequencies of the power source and the data signal are different, the cable cores can be multiplexed by the power source and the signal, and all loops are skillfully connected by utilizing a balance principle, so that the signals can be transmitted on the seven-core cable and the underground instrument can be supplied with power, namely, a mode of balancing power supply is achieved by utilizing phantom power supply; can realize the following steps: the underground instrument is picked and transmitted at once, so that the acquisition time of the underground instrument is shortened, the overlength of the underground instrument in the underground is avoided, and the service life of the instrument is prolonged; the use temperature of the downhole instrument is not limited by the filter capacitor, so that the use place of the downhole instrument is wider; the interference of large current on signal transmission during data acquisition is reduced, and the acquired data is more accurate.
Example 2
The device for multiplexing the underground measurement cable through the casing and the working method thereof are described in the embodiment 1 and the attached fig. 1, wherein a power supply transformer is a C-shaped iron core power supply transformer, the C-shaped iron core power supply transformer is provided with two primary coils and one secondary coil, and the parameters of the two primary coils are symmetrical; the C-shaped iron core power supply transformer comprises an iron core, a coil and a lead wire, wherein the lead wire comprises six primary coil lead wires and two secondary coil lead wires, a first alternating current power supply panel I is arranged on the secondary coil side of the C-shaped iron core power supply transformer, and a first cable core, a second cable core (1#, 2#) and a third cable core and a fourth cable core (3#, 4#) are respectively connected in parallel with the primary coil side of the C-shaped iron core power supply transformer. The ground system adopts a first alternating current power supply panel I to provide 50HZ adjustable alternating current, is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core (1#, 2#, 3#, 4#) of a seven-core cable through a C-type iron core power supply transformer, and transmits the 50HZ adjustable alternating current to the downhole instrument through the first cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#), and the downhole instrument obtains the adjustable alternating current through the C-type iron core power supply transformer and obtains the direct current through a rectifier bridge and a filter module of an AC/DC conversion unit to provide 60-180V direct current power for the downhole instrument.
As shown in fig. 2 to 4, the C-shaped core power supply transformer is composed of an iron core 1, a coil 2, and a lead 3, the lead 3 includes six primary coil leads and two secondary coil leads, and the overall size (package size) of the C-shaped core power supply transformer is: a. 52mm, b, 96mm, c, 53mm, d, 32.5mm.
It should be noted that the two primary coils and one secondary output coil of the C-type core power supply transformer require the parameters of the two primary coils to be symmetrical, as shown in fig. 2:
primary input terminal
A. Ac, amplitude: 0-100V, current: 0 to 0.4 (2 groups of parallel, single core 0 to 0.2A); frequency: 50HZ;
B. low frequency ac, amplitude: 0-50V, current: 0-8A (4 cores are parallel, single core 0-2A); frequency: 0.1HZ;
secondary output end
Ac, amplitude: 0-100V, current: 0 to 0.4A; frequency: 50HZ;
the ratio of the primary coil to the secondary coil is tentatively 1:1.
The foregoing description of the preferred embodiments of the utility model is merely illustrative of the utility model and is not intended to limit the scope of the utility model; the foregoing is merely illustrative of the present utility model and is not intended to limit the scope of the present utility model; any modification, equivalent replacement, improvement or the like of the technical scheme of the present utility model by those skilled in the art should fall within the protection scope of the present utility model as defined in the claims without departing from the design spirit of the present utility model.
Claims (15)
1. The utility model provides a cross sleeve pipe underground measurement cable multiplexing device, adopts seven core cable as the power supply cable of ground system and instrument in pit to and for the collection of instrument in the pit and transmission data provide working power supply, its characterized in that: the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable are connected with a ground system and an underground instrument through a power supply transformer, and the adjustable alternating current of the ground system is converted into direct current and is provided for the underground instrument; the fifth cable core and the sixth cable core of the seven-core cable are connected with a ground communication control system and an underground communication control system through a communication transformer to transmit communication signals between the ground system and an underground instrument, and are used as alternating current power supply transmission cables of the motor; a seventh cable core of the seven-core cable is connected with the wellhead and the underground voltage acquisition board to transmit reference U-electrode signals; the underground instrument obtains adjustable alternating current from a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and obtains direct current through an AC/DC conversion unit; the ground system adopts a first alternating current power supply panel to provide adjustable alternating current, is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and is used for transmitting the adjustable alternating current through the first cable core, the second cable core, the third cable core and the fourth cable core.
2. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the first alternating current power supply panel is arranged on the secondary coil side of the power supply transformer.
3. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the first cable core, the second cable core, the third cable core and the fourth cable core are respectively connected in parallel to the primary coil side of the power supply transformer.
4. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the AC/DC conversion unit comprises a rectifier bridge and a filter module.
5. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the first alternating current power supply panel outputs 50HZ adjustable alternating current, the 50HZ adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of the seven-core cable through a power supply transformer, and the first cable core, the second cable core, the third cable core and the fourth cable core transmit the adjustable alternating current to the AC/DC conversion unit to perform alternating current/direct current conversion, so that 60-180V direct current power is provided for underground instruments.
6. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the ground system is provided with a current source panel, and is connected with the current source panel through a single current wire.
7. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the downhole instrument is provided with a current conversion plate, and the downhole instrument is connected with the current conversion plate through a single current wire.
8. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the power supply transformer is provided with two primary coils and one secondary coil, and parameters of the two primary coils are symmetrical.
9. The over-casing downhole measurement cable multiplexing device of claim 1 or 8, wherein: the power supply transformer comprises an iron core, a coil and leads, wherein the leads comprise six primary coil leads and two secondary coil leads.
10. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the ground system adopts a second alternating current power supply panel to provide adjustable alternating current, takes the cable cover of the seven-core cable as a loop, transmits the adjustable alternating current to the underground motor and the hydraulic valve power supply switching circuit board, and provides working power for the motor or the electromagnetic valve.
11. The over-casing downhole measurement cable multiplexing device of claim 10 wherein: the adjustable alternating current frequency output by the second alternating current power supply panel is 50HZ.
12. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the ground communication control system is connected with the second alternating current power supply panel through a single current wire.
13. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the underground communication control system is connected with the motor and the hydraulic valve power supply switching circuit board through a single current wire.
14. The over-casing downhole measurement cable multiplexing device of claim 1, wherein: the ground communication transmitting module and the ground communication receiving module of the ground communication control system couple communication signals to the fifth cable core and the sixth cable core of the seven-core cable through the communication transformer, and the fifth cable core and the sixth cable core of the seven-core cable differentially transmit the communication signals to the underground communication transmitting module and the underground communication receiving module of the underground communication control system.
15. A method of operating a over-casing downhole measurement cable multiplexing device employing the over-casing downhole measurement cable multiplexing device of any of claims 1 to 14, characterized by: the method comprises the following steps:
in the operation of a ground system and an underground instrument, the ground system adopts a first alternating current power supply panel to provide 50HZ adjustable alternating current, the 50HZ adjustable alternating current is coupled to a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable through a power supply transformer, the first cable core, the second cable core, the third cable core and the fourth cable core transmit the 50HZ adjustable alternating current to the underground instrument, and the underground instrument obtains direct current from the 50HZ adjustable alternating current obtained from the first cable core, the second cable core, the third cable core and the fourth cable core of the seven-core cable through the power supply transformer in a rectifier bridge and a filtering module mode through an AC/DC conversion unit, wherein the power supply range of the direct current is 60-180V;
step two, a large current obtained by inputting a single current wire by a ground system is connected to a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable through a power supply transformer, and a downhole instrument outputs the single current wire in the same mode and is connected to a current reversing plate so as to be a loop;
the ground communication control system differentially transmits communication signals through a fifth cable core and a sixth cable core of the seven-core cable, can simultaneously transmit communication at the moment of transmitting large current, and does not influence the power supply and the communication signal transmission;
step four, a motor of the underground instrument and a power supply switching circuit board of a hydraulic valve are coupled with a fifth cable core and a sixth cable core of the seven-core cable through a communication transformer to transmit alternating current in parallel, and a cable cover is used as a transmission loop;
and fifthly, connecting the wellhead with a voltage acquisition plate under the well through a seventh cable core of the seven-core cable, wherein the seventh cable core of the seven-core cable transmits a reference signal of the U electrode.
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| CN109888772A (en) * | 2019-02-19 | 2019-06-14 | 中国海洋石油集团有限公司 | A kind of logger power supply system |
| CN112953730B (en) * | 2021-01-26 | 2022-12-13 | 上海柏楚数控科技有限公司 | Power supply and communication integrated transmission system |
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