CN207111074U - One kind crosses sleeve pipe underground survey cable multiplexer - Google Patents

Abstract

The utility model discloses a multiplexing device for downhole measuring cables through a casing. The multiplexing device for downhole measuring cables through a casing uses the first, second, third and fourth cable cores of a seven-core cable to connect to the ground through a power supply transformer. The system and downhole instruments convert the adjustable AC power of the ground system into direct current and supply it to the downhole instruments; the fifth and sixth cable cores of the seven-core cable are connected to the ground communication control system and the downhole communication control system through a communication transformer, and the ground system and the downhole communication control system are connected. The communication signal transmission of the downhole instrument is also used as the AC power transmission cable of the motor; the seventh cable core of the seven-core cable is used to connect the wellhead and the downhole voltage acquisition board to transmit the reference U electrode signal. Due to the limited number of cores of the seven-core cable, the power supply and signal can reuse the core. By using the principle of balance and cleverly connecting each circuit, the signal can be transmitted on the seven-core cable and the power supply for downhole instruments can be achieved by using phantom power supply to achieve balance. powered by.

Description

A casing-through downhole measuring cable multiplexing device

technical field

The utility model relates to the field of the well-ground communication system in the casing-pipe resistivity logging technology, in particular to a casing-pipe downhole measurement cable multiplexing device.

Background technique

Well logging cables are used for well logging, perforating, coring and other operations of various oil and gas wells, and can also be used for water conservancy and hydrological surveys, coal field geological exploration, geothermal logging, etc., to detect various parameters downhole, and are ground system It is used as a connecting line for connecting with underground instruments and transmitting measurement data.

The important role of logging cables is to transport various downhole instruments, transmit various signals between the ground control system and downhole instruments, and obtain the depth position of downhole information. The seven-core cable is commonly used.

At present, in the existing seven-core cable in the bushing, four cores are used for large current transmission, one core is the ground reference signal U, one core is 150V power supply and communication multiplexing, and the other core is motor and electromagnetic Valve power supply cord. When the instrument is working, first the motor works, the probe is released, then the instrument sends a large current to collect data, and finally the large current is turned off, and then the data transmission with the ground is carried out, and the collected data information is transmitted to the ground system. The acquisition of the instrument and the transmission of data are carried out separately. At the same time, after the power supply enters the instrument, it needs to be filtered through a large capacitor. Due to the existence of the capacitor, the temperature of the instrument is limited. The deficiencies in the existing technology of the cables in the bushings:

1. The system efficiency is relatively low and the test time is long;

2. When the instrument is working, it cannot achieve the effect of instant collection and transmission;

3. The influence of high emission current on the acquisition signal is too great;

4. The filter capacitance of the DC power supply is too large, which increases the manufacturing cost and limits the operating temperature of the instrument.

Among the existing technologies in this field, the Chinese utility model patent with the publication number CN201835827U discloses a multiplexing device for petroleum logging cable cores, which is used for data transmission and system power supply between ground equipment and downhole instruments, but the device Its structure and effect can no longer meet the current use requirements.

Utility model content

In order to solve the technical problems existing in the prior art of downhole measurement cables through casing, the utility model provides a multiplexing device for downhole measurement cables through casing, which uses the fifth and sixth cores of the seven-core cable to communicate and transmit The power supply of the motor uses the 1st, 2nd, 3rd and 4th cable cores of the seven-core cable to transmit large currents and provide working power for each circuit board in the well at the same time, and uses the seventh cable core of the seven-core cable as the U reference voltage. The number is limited. When using a seven-core cable for transmission, the power supply and information transmission need to share the cable core. Since the frequencies of the power supply and data signals are different, the power supply and the signal can reuse the cable core. Using the principle of balance, each circuit is cleverly connected. It is possible to transmit signals and supply power to downhole instruments on the seven-core cable, that is, to use phantom power supply to achieve balanced power supply.

In order to achieve the above object, the utility model adopts the following technical solutions.

Firstly, the utility model discloses a multiplexing device for downhole measurement cables through casing.

The downhole measurement cable multiplexing device through the casing of the utility model adopts a seven-core cable as a power supply cable for the ground system and downhole instruments and provides working power for collecting and transmitting data of downhole instruments. The first cable of the seven-core cable The core, the second cable core, the third cable core, and the fourth cable core are connected to the ground system and the downhole instrument through a power supply transformer, and the adjustable alternating current of the ground system is converted into direct current for the downhole instrument; the fifth cable of the seven-core cable The core and the sixth cable core are connected to the ground communication control system and the downhole communication control system through the communication transformer, and carry out the communication signal transmission between the ground system and the downhole instrument, and also serve as the AC power transmission cable of the motor; the seventh core of the seven-core cable The cable core connects the wellhead and the downhole voltage acquisition board to transmit the reference U electrode signal.

Preferably, the ground system uses the first AC power supply panel to provide adjustable AC power, and is coupled to the first cable core, the second cable core, the third cable core, and the fourth cable core of the 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 perform adjustable AC power transmission.

In any of the above technical solutions, it is preferred that the downhole instrument obtains 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 a power supply transformer, and through the AC The /DC conversion unit obtains direct current.

In any of the above technical solutions, preferably, the first AC power supply panel is arranged on the side of the secondary coil of the power supply transformer.

In any of the above technical solutions, preferably, 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.

In any of the above technical solutions, 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 50HZ adjustable AC power, and the 50HZ adjustable AC power is coupled to the first cable core, the second cable core, and the second cable core of the seven-core cable through a power supply transformer. Three cable cores, the fourth cable core, the first cable core, the second cable core, the third cable core, and the fourth cable core transmit adjustable AC power to the AC/DC conversion unit for AC/DC conversion, providing 60- 180V DC power supply.

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 wire.

In any of the above technical solutions, preferably, the downhole instrument is provided with a current conversion board, and the downhole instrument is connected to the current conversion board through a single current wire.

In any of the above technical solutions, preferably, the power supply transformer is provided with two primary coils and one secondary coil, and the parameters of the two primary coils are symmetrical.

In any of the above technical solutions, preferably, the power supply transformer includes an iron core, a wire wrap and lead wires, and the lead wires include six primary coil lead wires and two secondary coil lead wires.

In any of the above technical solutions, preferably, the ground system uses the second AC power supply panel to provide adjustable AC power, and uses the sheath of the seven-core cable as a loop to transmit the adjustable AC power to the downhole motor and hydraulic valve power supply switching circuit board , to provide working power for motors or solenoid valves.

In any of the above technical solutions, preferably, the frequency of the adjustable alternating current output by the second alternating current power supply panel is 50 Hz.

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 wire.

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 wire.

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. The fifth cable core and the sixth cable core of the core cable differentially transmit 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 downhole measuring cable multiplexing device through casing.

The working method of the casing downhole measurement cable multiplexing device of the present utility model adopts the casing downhole measurement cable multiplexing device as described in any one of the above, and the working method includes the following steps:

Step 1. During the work of the surface system and downhole instruments, the surface system uses the first AC power supply panel to provide 50HZ adjustable AC power, and the 50HZ adjustable AC power is coupled to the first cable core and the second cable of the seven-core cable through the power supply transformer. core, the third cable core, and the fourth cable core, the first cable core, the second cable core, the third cable core, and the fourth cable core transmit the adjustable AC power of 50HZ to the downhole instrument, and the downhole instrument will pass through the power supply transformer 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 obtains direct current through the AC/DC conversion unit in the form of a rectifier bridge and a filter module. The available power supply range is 60-180V;

Step 2: The large current obtained by inputting a single current wire into the surface system is connected to 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 the downhole instrument adopts the same method The output single current line is connected to the current commutation board, with the earth as the loop;

Step 3, the ground communication control system differentially transmits communication signals through the fifth cable core and the sixth cable core of the seven-core cable, which can simultaneously perform communication transmission at the time of transmitting a large current, and the power supply and communication signal transmission do not affect each other;

Step 4, the motor and hydraulic valve power supply switching circuit board of the downhole instrument is coupled with the fifth cable core and the sixth cable core of the seven-core cable through the communication transformer to transmit alternating current in parallel, and the cable sheath is used as the transmission circuit;

Step 5, the wellhead is connected to the downhole voltage acquisition board through the seventh cable core of the seven-core cable, and the seventh cable core of the seven-core cable transmits the reference signal of the U electrode.

The downhole measuring cable multiplexing device through casing and the working method thereof of the present utility model, the downhole measuring cable multiplexing device through casing adopts the seven-core cable as the power supply cable between the ground system and the downhole instrument, and provides the collection and transmission data of the downhole instrument Working power supply; the first cable core, the second cable core, the third cable core, and the fourth cable core of the seven-core cable are connected to the ground system and the downhole instrument through a power supply transformer, and the adjustable AC power of the ground system is converted into a DC power for the downhole instrument ;The fifth cable core and the sixth cable core of the seven-core cable are connected to the ground communication control system and the downhole communication control system through the communication transformer, and carry out the communication signal transmission between the ground system and the downhole instrument, and also serve as the AC power transmission cable of the motor; The seventh cable core of the seven-core cable is connected to the wellhead and the downhole voltage acquisition board to transmit the reference U electrode signal. The through-casing downhole measurement cable multiplexing device is used for through-casing resistivity logging. The surface system uses the adjustable AC power provided by the first AC power supply panel. The adjustable AC power is coupled to the first cable core of the seven-core cable through a power transformer. , the second cable core, the third cable core, and the fourth cable core, the first cable core, the second cable core, the third cable core, and the fourth cable core transmit adjustable alternating current to the downhole instrument, and the downhole instrument will be powered by The transformer obtains adjustable alternating current from the first cable core, second cable core, third cable core, and fourth cable core of the seven-core cable and obtains direct current through the AC/DC conversion unit; the large current obtained by inputting a single current line into the ground system Connect to the first cable core, second cable core, third cable core, and fourth cable core of the seven-core cable through a power supply transformer. It is a loop; the ground communication control system transmits communication signals differentially through the fifth and sixth cable cores of the seven-core cable, which can simultaneously transmit communication when high current is emitted, and the power supply and communication signal transmission do not affect each other; downhole instruments The motor and hydraulic valve power supply switching circuit board is coupled to the fifth and sixth cable cores of the seven-core cable through a communication transformer to transmit alternating current in parallel, and the cable sheath is used as the transmission circuit; the wellhead is connected to the underground through the seventh cable core of the seven-core cable In the voltage acquisition board, the seventh cable core of the seven-core cable transmits the reference signal of the U electrode.

Compared with the prior art, the above-mentioned technical solution of the utility model has the following beneficial effects:

1. Downhole instruments can be collected and transmitted immediately, which shortens the acquisition time of downhole instruments, and at the same time avoids the downhole instruments being used for too long in the well, thereby prolonging the service life of the instruments;

2. The operating temperature of the downhole instrument will not be limited by the filter capacitor, so that the downhole instrument can be used in a wider range of places;

3. It reduces the interference of high current on signal transmission during data collection, and the data collection is more accurate.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

1 is a schematic diagram of the circuit principle of the downhole measurement cable multiplexing device through casing according to a preferred embodiment of the casing downhole measurement cable multiplexing device of the present utility model;

Fig. 2 is a schematic diagram of wiring of a C-core power supply transformer according to a preferred embodiment of the downhole measurement cable multiplexing device through casing of the present invention;

Fig. 3 is a front view of the structure of a C-core power supply transformer according to a preferred embodiment of the downhole measurement cable multiplexing device through casing of the present invention;

Fig. 4 is a side view of the structure of a C-core power supply transformer according to a preferred embodiment of the downhole measurement cable multiplexing device through the casing of the present invention;

Reference signs:

1. Iron core, 2. Wire package, 3. Lead wire.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In order to overcome the problems existing in the existing technology of downhole measurement cables through casing: during the resistivity logging process through casing, the ground system has low efficiency and long testing time, and the downhole instrument cannot realize instant transmission when working, and the emission is large. The influence of the current on the signal is too large, and the filter capacitance of the DC power supply is too large, which increases the manufacturing cost and limits the operating temperature of the downhole instrument. The embodiment of the utility model proposes a casing downhole measurement cable multiplexing device and its working method, which uses the first, second, third, and fourth cable cores of the seven-core cable to transmit large currents and simultaneously provide working power for each circuit board in the downhole , use the 5th and 6th cable cores of the heptapod cable to communicate and transmit the power of the motor, and use the 7th cable core of the heptapod cable as the U reference voltage. Due to the limited number of cable cores, when using the seven-core cable for transmission, the power supply and Information transmission needs to share the cable core, and because the frequency of the power supply and data signal is different, the power supply and signal can reuse the cable core, and use the balance principle to skillfully connect each circuit, so that both the signal can be transmitted on the seven-core cable and the signal can be sent to the underground. Instrument power supply, that is, the way of using phantom power supply to achieve balanced power supply.

Example 1

The through-casing downhole measurement cable multiplexing device uses a seven-core cable as the power supply cable for the ground system and downhole instruments, and uses a seven-core cable to provide working power for the acquisition and transmission of data by downhole instruments.

As shown in Figure 1, the downhole measurement cable multiplexing device described in this embodiment: the first cable core, the second cable core, the third cable core, and the fourth cable core (1#, 2#) of the seven-core cable #, 3#, 4#) connect the ground system and downhole instruments through power supply transformers, and convert the adjustable AC power of the ground system into direct current for downhole instruments; the fifth and sixth cable cores of the seven-core cable (5#, 6#) connect the ground communication control system and the downhole communication control system through the communication transformer, carry out the communication signal transmission between the ground system and the downhole instrument, and also serve as the AC power transmission cable of the motor; the seventh cable core of the seven-core cable (7# ) to connect the wellhead and the downhole voltage acquisition board to transmit the reference U electrode signal.

In the cased downhole measurement cable multiplexing device described in this embodiment, the ground system adopts the first AC power supply panel 1 to provide adjustable AC power, and is coupled to the first cable core, the second cable core, and the second cable core of the seven-core cable through a power supply transformer. On the three cable cores and the fourth cable core (1#, 2#, 3#, 4#), the first cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#) for adjustable AC power transmission; the downhole instrument transmits from the first cable core, the second cable core, the third cable core and the fourth cable core (1#, 2#, 3#, 4#) to obtain adjustable AC power, and obtain DC power through the AC/DC conversion unit; the AC/DC conversion unit includes a rectifier bridge and a filter module; the first AC power supply panel I is set on the secondary coil side of the power supply transformer, and the second One cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#) are respectively connected in parallel to the primary coil side of the power supply transformer; the first AC power supply panel I Output 50HZ adjustable alternating current, coupled to the first cable core, second cable core, third cable core, fourth cable core (1#, 2#, 3#, 4#) of the seven-core cable through the power transformer The first cable core, the second cable core (1#, 2#), the third cable core, and the fourth cable core (3#, 4#) transmit adjustable AC power to the AC/DC conversion unit for AC/DC conversion, which is used for downhole The instrument provides 60-180V DC power supply.

In the cased downhole measurement cable multiplexing device described in this embodiment, the surface system is provided with a current source panel, and the surface system is connected to the current source panel through a single current wire; Connect the wires to the current conversion board.

In the cased downhole measurement cable multiplexing device described in this embodiment, the power supply transformer is provided with two primary coils and a secondary coil, and the parameters of the two primary coils are symmetrical; the power supply transformer includes an iron core, a wire package and a lead wire, and the lead wire Includes six primary coil leads and two secondary coil leads.

In the cased downhole measurement cable multiplexing device described in this embodiment, the ground system uses the second AC power supply panel II to provide adjustable AC power, and uses the cable sheath of the seven-core cable as a loop to transmit adjustable AC power to the downhole motor and hydraulic valve. The power supply switching circuit board provides working power for the motor or solenoid valve; the adjustable AC frequency output by the second AC power supply panel II is 50HZ; the ground communication control system is connected to the second AC power supply panel II through a single current line; the underground communication control system Connect the motor and hydraulic valve power supply switching circuit board through a single current line; the ground communication transmitting module and the ground communication receiving module of the ground communication control system couple the communication signal to the fifth and sixth cable cores of the seven-core cable through the communication transformer ( 5#, 6#), the fifth and sixth cable cores (5#, 6#) of the seven-core cable differentially transmit communication signals to the downhole communication transmitting module and downhole communication receiving module of the downhole communication control system.

The working method of the through-casing downhole measurement cable multiplexing device described in this embodiment includes the following steps:

Step 1. During the work of the surface system and downhole instruments, the surface system uses the first AC power supply panel to provide 50HZ adjustable AC power, and the 50HZ adjustable AC power is coupled to the first cable core and the second cable of the seven-core cable through the power supply transformer. Core, the third cable core, the fourth cable core (1#, 2#, 3#, 4#), the first cable core, the second cable core (1#, 2#) and the third cable core, the The four cable cores (3#, 4#) transmit 50HZ adjustable AC power to the downhole instrument, and the downhole instrument will transfer 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. (1#, 2#, 3#, 4#) The 50HZ adjustable alternating current obtained from the AC/DC conversion unit is used to obtain direct current in the form of a rectifier bridge and a filter module, and the power supply range of the direct current is 60-180V;

Step 2, the large current obtained by inputting a single current line into the ground system is connected to the first cable core, the second cable core, the third cable core, and the fourth cable core (1#, 2#, 3 #, 4#), the downhole instrument uses the same method to output a single current line connected to the current commutation board, with the earth as the loop;

Step 3: The ground communication control system differentially transmits communication signals through the fifth cable core and sixth cable core (5#, 6#) of the seven-core cable, which can carry out communication transmission at the same time when a large current is emitted, and the power supply and communication signal The transmission does not affect each other;

Step 4: The motor and hydraulic valve power supply switching circuit board of the downhole instrument is coupled with the fifth cable core and the sixth cable core (5#, 6#) of the seven-core cable through the communication transformer to transmit alternating current in parallel, and the cable sheath is used as the transmission circuit;

Step 5, the wellhead is connected to the downhole voltage acquisition board through the seventh cable core (7#) of the seven-core cable, and the seventh cable core of the seven-core cable transmits the reference signal of the U electrode.

The through-casing downhole measurement cable multiplexing device and its working method of this embodiment are used for the through-casing resistivity logging operation, and the 5 and 6# cable cores of the seven-core cable are used to communicate and transmit the power of the motor. The 1, 2, 3, 4# cable cores of the cable transmit large current and provide working power for each circuit board in the well at the same time. The 7# cable core of the seven-core cable is used as the U reference voltage. Due to the limited number of cable cores, the seven-core cable is used When the cable is transmitted, the power supply and information transmission need to share the cable core, and because the frequency of the power supply and the data signal are different, the power supply and the signal can reuse the cable core. It not only transmits signals but also supplies power to downhole instruments, that is, the way of using phantom power supply to achieve balanced power supply; it can realize: instant mining and transmission of downhole instruments, shortening the acquisition time of downhole instruments, and avoiding excessive use time of downhole instruments in the well Longer, which in turn prolongs the service life of the instrument; the operating temperature of the downhole instrument will not be limited by the filter capacitor, so that the downhole instrument can be used in a wider range; the interference of the large current on the signal transmission during data collection is reduced, and the collected data is more accurate .

Example 2

As described in Embodiment 1 and accompanying drawing 1, the downhole measurement cable multiplexing device through casing and its working method, the power supply transformer adopts a C-type iron core power supply transformer, and the C-type iron core power supply transformer is provided with two primary coils and a secondary coil. The primary coil, the parameters of the two primary coils are symmetrical; the C-type iron core power supply transformer includes an iron core, a wire package and a lead wire, and the lead wire includes six primary coil lead wires and two secondary coil lead wires, and the first AC power supply panel I is set on a C-type On the secondary coil side of the iron core power supply transformer, the first cable core, the second cable core (1#, 2#), the third cable core, and the fourth cable core (3#, 4#) are respectively connected in parallel to the C-type iron core Primary side of the supply transformer. The ground system uses the first AC power supply panel I to provide 50HZ adjustable AC power, which is coupled to the first cable core, second cable core, third cable core, and fourth cable core (1 #, 2#, 3#, 4#), the first cable core, the second cable core (1#, 2#) and the third cable core, the fourth cable core (3#, 4#) transmit 50HZ The adjustable AC power is supplied to the downhole instrument, and the downhole instrument obtains the adjustable AC power through the C-core power supply transformer, and obtains the DC power through the rectifier bridge and filter module of the AC/DC conversion unit, and provides 60-180V DC power supply for the downhole instrument.

As shown in Figures 2 to 4, the C-type iron core power supply transformer is composed of iron core 1, wire package 2 and lead wire 3. The lead wire 3 includes six primary coil lead wires and two secondary coil lead wires. The overall C-type iron core power supply transformer Dimensions (after packing): 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 Figure 2:

primary input

A. AC, amplitude: 0~100V, current: 0~0.4 (2 groups parallel, single core 0~0.2A); frequency: 50HZ;

B. Low frequency AC, amplitude: 0~50V, current: 0~8A (4 cores parallel, single core 0~2A); frequency: 0.1HZ;

secondary output

AC, amplitude: 0~100V, current: 0~0.4A; frequency: 50HZ;

The ratio of the primary coil to the secondary coil is tentatively set at 1:1.

The above is only a description of the preferred implementation of the present utility model, not to limit the scope of the present utility model; the above is only the specific implementation of the present utility model, and is not used to limit the protection scope of the present utility model; Under the premise of not departing from the design spirit of the present utility model, any modification, equivalent replacement, improvement, etc. made by ordinary engineers and technicians in the field to the technical solution of the present utility model shall fall within the scope of protection determined by the claims of the present utility model Inside.

Claims (16)

1. one kind crosses sleeve pipe underground survey cable multiplexer, using power supply of the seven core cable as ground system and downhole instrument Cable, and collection for downhole instrument and transmission data provide working power, it is characterised in that：The first of the seven core cable Cable core, the second cable core, the 3rd cable core, the 4th cable core connect ground system and downhole instrument by supply transformer, The adjustable alternating current of ground system is converted into direct current and is supplied to downhole instrument；5th cable core of the seven core cable, 6th cable core connects ground communications control system and downhole communication control system by Telecommunication Transformers, carry out ground system with The communication signal transmissions of downhole instrument, while the alternating-current power supply transmission cable also as motor；The 7th of the seven core cable Cable core connects well head and underground voltage acquisition plate, carries out the transmission with reference to U electrode signals.

2. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The ground system uses First Alternating Current Power Supply panel provides adjustable alternating current, by supply transformer be coupled to seven core cable the first cable core, the Two cables core, the 3rd cable core, on the 4th cable core, by the first cable core, the second cable core and the 3rd cable core, the 4th cable Core carries out the transmission of adjustable alternating current.

3. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The downhole instrument passes through Supply transformer obtains adjustable from the first cable core of seven core cable, the second cable core, the 3rd cable core, the 4th cable core Alternating current, direct current is obtained by AC/DC converting units.

4. as claimed in claim 2 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：First Alternating Current Power Supply Panel is arranged on the second coil side of supply transformer.

5. as claimed in claim 2 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：First cable core, Second cable core and the 3rd cable core, the 4th cable core are parallel to the primary side of supply transformer respectively.

6. as claimed in claim 3 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The AC/DC conversions are single Member includes rectifier bridge and filtration module.

7. as claimed in claim 2 or claim 3 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：First exchange Panel of powering exports 50HZ adjustable alternating current, and the adjustable alternating current of the 50HZ is coupled to seven cores by supply transformer The first cable core, the second cable core, the 3rd cable core, the 4th cable core of cable, the first cable core, the second cable core and the 3rd Cable core, the 4th cable core transmit adjustable alternating current to AC/DC converting units and carry out AC/DC conversion, are carried for downhole instrument For 60-180V dc source.

8. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The ground system is set There is current source panel, the ground system connects current source panel by single electric current line.

9. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The downhole instrument is set There is electric current change-over panel, the downhole instrument connects electric current change-over panel by single electric current line.

10. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The supply transformer Two primary coils and a secondary coil are provided with, the parameter of described two primary coils is symmetrical.

11. cross sleeve pipe underground survey cable multiplexer as described in claim 1 or 10, it is characterised in that：The power supply becomes Depressor includes iron core, line bag and lead, and the lead includes six roots of sensation primary coil lead and two secondary coil leads.

12. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The ground system is adopted Adjustable alternating current is provided with the second Alternating Current Power Supply panel, using the cable skin of seven core cable as loop, transmits adjustable alternating current To downhole electrical motor and hydraulic valve power switching circuit board, working power is provided for motor or magnetic valve.

13. as claimed in claim 12 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：Second exchange supplies The adjustable ac frequency of electric panel output is 50HZ.

14. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The ground communications control System processed connects the second Alternating Current Power Supply panel by single electric current line.

15. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The downhole communication control System processed connects motor and hydraulic valve power switching circuit board by single electric current line.

16. as claimed in claim 1 cross sleeve pipe underground survey cable multiplexer, it is characterised in that：The ground communications control The ground communications transmitter module and ground communications receiving module of system processed pass through Telecommunication Transformers coupling communication signal to seven cores electricity On 5th cable core of cable, the 6th cable core, the 5th cable core of seven core cable, the 6th cable core differential transfer signal of communication are extremely The downhole communication transmitter module and downhole communication receiving module of downhole communication control system.