CN101515039B - Underground power supply and signal transmission system - Google Patents
Underground power supply and signal transmission system Download PDFInfo
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- CN101515039B CN101515039B CN2008100096649A CN200810009664A CN101515039B CN 101515039 B CN101515039 B CN 101515039B CN 2008100096649 A CN2008100096649 A CN 2008100096649A CN 200810009664 A CN200810009664 A CN 200810009664A CN 101515039 B CN101515039 B CN 101515039B
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Abstract
The invention relates to a high-efficiency power supply and telemetered signal transmission system. The transmission system comprises at least one alternating current transmission circuit, at least one signal transmission circuit, a well measuring cable, at least one cable terminal circuit and a direct current transmission circuit; alternating current is coupled by a transformer or directly transmitted to the alternating current transmission circuit; subsequently, alternating current is provided for underground instruments by the alternating current transmission circuit; a signal is coupled by the transformer or directly transmitted to the signal transmission circuit; and subsequently, the signal transmission circuit transmits a downlink signal to the underground instruments or transmits an uplink signal to ground equipment. The transmission system can meet complex power-supply requirements of the underground instruments and large data acquisition of the underground instruments.
Description
Technical field
The present invention relates to and lower Power supply and signal transmission system.In the logging operation process, on the one hand, ground installation provides required working power by described transmission system safely to downhole instrument; On the other hand, described transmission system can be transmitted telemetered signal between ground installation and downhole instrument.
Background technology
Well logging refers generally to use the process that multiple downhole instrument comes measuring well week stratum physical characteristic.At present, main logging method has resistivity, sound wave and radioactivity.In conventional logging, by cable downhole instrument is transferred in the well first, then begin logging operation.As shown in Figure 1, in the logging operation process, at first downhole instrument is transferred to and the eye in; Secondly, ground installation provides the required power supply of logging operation and sends order to downhole instrument to downhole instrument by described system; Then, downhole instrument gathers various formation datas in the process of carrying or transferring; At last, these data are transferred to ground by cable telemetry system, and ground installation records, shows, analyzes and process these data again.
Logging cable commonly used has seven core cable and single-core cable.Logging cable not only can signal transmission and electric energy, and because its mechanical performance is very good, so can also bear the huge tension force that produces in the during well logging.At present, most popular logging cable is seven core cable.Fig. 2 A is the structure cross section of seven core cable commonly used: wherein, A is copper conductor, B is insulation materials, C is packing material, D is inner armor, and E is outer armor, and the resistance value of cable core is relevant with cable core material therefor and length, 7 cable cores insulate each other, are in order to increase the mechanical strength of cable and design two-layer outer armor purpose.Seven core cable is comprised of seven cable cores (numbering 1 to 7), and cable core 7 occupies central authorities, cable core 1 to 6 be centered around symmetrically 7 around.On the every cable core certain resistance is arranged, the size of resistance is directly proportional with cable length.Usually, the resistance of cable is approximately 33 ohm of every kms.In electric energy transmitting and signal process, the resistance of cable can cause the loss of electric energy and the loss of signal.The length of seven core cable can reach thousands of rice.Because every cable core has its intrinsic inductance, has " cross-talk " between the cable core.Therefore, in transmission signal process, signal can distorted.Fig. 2 B is the transmission mode schematic diagram of conventional seven core cable.According to balance/orthogonality principle, 7 cable cores of seven core cable are made up by different way can form 7 kinds of transmission modes: pattern 1 (M1), pattern 2 (M2), mode 3 (M3), pattern 4 (M4), pattern 5 (M5), pattern 6 (M6) and mode 7 (M7).
Form transmission circuit with the cable outer armor after the six roots of sensation cable parallel connection of pattern 1 finger handle periphery.The advantage of this pattern is that cable core resistance is minimum but electric capacity that distribute is maximum.But its shortcoming is can be minimum for the signal bandwidth of transmission.Pattern 2 fingers are with the utmost point of cable core 2,3 (relative intensity is 1) connection as electrode, and cable core 5,6 (relative intensity is 1) connects another utmost point as electrode.One of advantage of M2 is the good insulation preformance between the cable core, and two of advantage is can reduce the power supply cable core " cross-talk " of other cable core disturbed.Mode 3 is cable core 2,6 (relative intensity is 1) to be together in parallel form transmission circuit with cable core 4 (relative intensity is 2); Simultaneously, cable core 3,5 (relative intensity is 1) is together in parallel and forms circuit with cable core 1 (relative intensity is 2).M3 is higher to the type of drive requirement of signal, and still, if the transmission circuit design is reasonable, M3 but can greatly improve the service efficiency of cable core and the transmission quantity of signal.Pattern 4 is a kind of non-equilibrium signal drive patterns, it by cable core 2,6,3,5 and cable core 1,4 form.Be exactly specifically cable core 2,6,3,5 as negative pole (relative intensity all is 1), cable core 1,4 as positive pole (relative intensity all is 2).Pattern 5 by cable core 2,5 and cable core 3,6 form, namely (relative intensity is 1: 1: 1 to cable core 2,5: 1) for negative pole for positive pole cable core 3,6.The advantage of M5 is can be wider for the signal band of transmission.Pattern 6 is cable core 1,3,5 and cable core 2,4,6 the two poles of the earth (relative intensity all is 1) as electrode in parallel respectively.The advantage of M6 also is that cable core resistance is less, and the speed of transmit signal data is high, can supply the signal band of transmission wider.Mode 7 is that central cable core 7 and outer armour skin are formed circuit.Because the electric capacity between cable core 7 and the armour skin is minimum, so M7 is can be for the semaphore that transmits large and speed is high.It should be noted that when transmitting alternating current with outer armor as electrode, be easy to cause personal injury and device damage.
Use 7 kinds of transmission mode electric energy transmittings and signal can reduce mutual interference, but efficiency of transmission but have difference.Pattern 1 and 6 cable core resistance are minimum, their the most suitable electric energy transmittings.Because mode 7 can be large and speed is high for the semaphore of transmission, so M7 often is used to the transmission of data.The frequency response of pattern 5 is got well than pattern 2,3,4 but is poorer than pattern 6.But pattern 5 realizes easily, so M5 also is usually used in the transmission of data.Mode 3 requires higher to the signal driver mode, still, if the reasonable design transmission circuit, M3 is very effectively electric energy transmitting and signal also.
In the well logging transmission course, seven core cable should be powered to downhole instrument by the transmission of data again simultaneously.Should a kind of transmission mode or the combination of several modes if reasonably make, just can make between the power supply circuits, between the signal circuit, the interference between power supply circuits and the signal circuit drops to minimum.
Along with the development of logging technique, the quantity of downhole instrument and complexity all constantly increase and improve.Correspondingly, downhole instrument also increases the demand of electric energy thereupon; Signal and the data volume of downhole instrument collection significantly increase; Requirement to message transmission rate also significantly improves.The required power supply of downhole instrument generally comprises main power source, accessory power supply, electrode supply and dc source.The data of transmitting between ground installation and the downhole instrument generally are divided into the analog signal of upstream data (also can be described as signal), downlink data, natural potential (SP) signal and other well logging.
At present, domestic well logging field is also relatively backward in cable conductor allocative decision, transmission circuit design; In addition, the transmission kind of supply downhole instrument power supply is single, electric energy service efficiency and message transmission rate are also lower.Such as, domestic certain company's employing pattern 1 and 4 is given and lower instrument power supply, and employing pattern 2,3,5 and 6 is uploaded signal or the down biography order that downhole instrument gathers.But this mode is difficult to satisfy downhole instrument to demand high-power, the multi-frequency power supply, can not satisfy the requirement of uploading a large amount of underground signals.Such as a certain logging system of domestic production, data transmission rate is 300KBPS.
External certain company was respectively at (patent No. US7 in 2003,154,412B), (patent No. US 6 in 2002,914,538B2) with (patent No. US6 in 1999,469,636B1) obtained three patents about high capacity power source survey and method (High-Power Well Logging Method And Apparatus).Fig. 3 A～Fig. 3 C is the concrete mode of two kinds of more advanced Power supplies of the said firm and telemetered signal transmission.Fig. 3 A is power supply and the signal transmission form of a certain system of the said firm.This mode can be supplied two kinds of alternating currents simultaneously under also, namely adopt pattern M2 or M5 power supply, adopts pattern M6 or M7 to transmit telemetered signal.Fig. 3 B and Fig. 3 C are power supply and the signal transmission forms of the another kind of logging system of the said firm.This mode can be supplied one road alternating current and one road direct current simultaneously to the down-hole; In addition, this mode shares a channel transfer and lower electric energy, upload and under pass telemetered signal, namely adopt pattern 5.This logging system maximal uplink transfer rate has reached 800KBPS.But from the angle of efficient, power supply and the signal transmission form of these systems all have much room for improvement.
In sum, how provide required power supply simultaneously a large amount of signals of down-hole quickly and reliably to be transferred to ground installation to downhole instrument safely, become one of difficult problem that world's logging community faces.Power supply of the present invention and signal transmission system propose for solving this difficult problem.
Summary of the invention
Downhole instrument Power supply of the present invention and telemetered signal transmission system comprise: at least one alternating current transmission circuit, described alternating current is coupled to by power transformer or directly is transferred in the alternating current transmission circuit, then, provide AC power by described alternating current transmission circuit to downhole instrument; At least one signal circuit, described signal by transformer coupled to or directly be transferred in this signal circuit, then, by this signal circuit downstream signal is transferred to downhole instrument, perhaps with uplink signal transmissions to ground installation; Logging cable, described logging cable are used for the signal transmission between ground installation and the downhole instrument and are the downhole instrument power supply; At least one cable socket circuit, described cable socket circuit is connected to the logging cable two ends, forms at least one transmission circuit; With the direct current transmission circuit, when to and during the power supply of lower DC load, another cable core of making a galvanic utmost point, described cable with a cable core or several cable core parallel connection of described cable or in addition several cable core parallel connections or outer armor as another utmost point of electric current.
The cable core of seven core cable has been combined to form 7 kinds of transmission modes (pattern 1, pattern 2, mode 3, pattern 4, pattern 5, pattern 6 and mode 7) by different way, and described system can be with one or more mode transfer electric energy and telemetered signal.In the present invention, any transmission mode can be transmitted upward signal and/or downstream signal and/or power supply.In various transmission modes, the resistance value of pattern 1 and 6 two kinds of patterns of pattern is minimum, and therefore, M1 and M6 are the most suitable to the downhole load electric energy transmitting.Mode 3 is higher to the type of drive requirement of signal, but because the resistance of M3 is less, so M3 also can electric energy transmitting.Mode 7 can be maximum for the semaphore of transmission, and the transmission of data is fast, so the most suitable signal transmission of M7.The frequency band of pattern 5 is wider, and it also can signal transmission.
Of the present invention and lower instrument power source power supply and telemetered signal transmission system can be with higher speed, transmit reliably the data between downhole instrument and the ground installation, and the required alternating current of downhole instrument and direct current can be provided safer, effectively.
Description of drawings
Fig. 1 illustrates logging operation schematic diagram of the present invention.
Fig. 2 (A) illustrates the structure sectional view of conventional seven core cable; Fig. 2 (B) illustrates the transmission mode schematic diagram of conventional seven core cable.
Fig. 3 (A)～Fig. 3 (C) illustrates two kinds of Power supplies of external certain company and the concrete mode of telemetered signal transmission.
Fig. 4 illustrates the schematic diagram of the seven core cable transmission system of the high delivery of electrical energy amount of the present invention's the 1st embodiment, high signal transmission rate.
Fig. 5 shows the derivation embodiment after embodiment shown in Figure 4 has been wiped out alternating current 12 and 22 transmission channels.
Fig. 6 shows the derivation embodiment after embodiment shown in Figure 4 is wiped out signal 102 and 202 transmission channels.
Fig. 7 shows the derivation embodiment after embodiment shown in Figure 4 is wiped out signal 101 and 201 transmission channels.
Fig. 8 shows the derivation embodiment after on the embodiment shown in Figure 4 the circuit of downhole end being made minor modifications.
The specific embodiment
Embodiment one
Fig. 4 is a specific embodiments of the present invention.This scheme can be transmitted two road alternating currents, one road direct current or one road low frequency electrode alternating current to downhole instrument simultaneously.In addition, this scheme can also provide two road communication ports simultaneously.
The transmission system of this scheme is divided into ground and down-hole two parts.Two coils of the parallel connection that above ground portion comprises ground AC power 11, transformer T1, primary coil and two secondary coils, link to each other with each secondary coil, continuous cable core and corresponding circuit; Also comprise ground AC power 12, transformer T3, a primary coil and a secondary coil, the cable core that links to each other and corresponding circuit; Also have ground AC power 13, the cable core that links to each other and corresponding circuit; Also comprise direct current of ground power supply, continuous cable core or outer armor and corresponding circuit; Also have terrestrial signal source 101, signal transformer T5, continuous cable core and corresponding circuit; Also have terrestrial signal source 102, signal transformer T7, primary coil and the electric capacity of a secondary coil, two series connection, the cable core that links to each other and corresponding circuit; And ground natural potential (SP) signal.
Down-hole part and above ground portion are symmetrical.Two coils of the parallel connection that the down-hole part comprises down-hole alternating current 21, transformer T2, two primary coils and a secondary coil, link to each other with each primary coil, continuous cable core and corresponding circuit; Also comprise down-hole alternating current 22, transformer T4, a primary coil and a secondary coil, the cable core that links to each other and corresponding circuit; Also have down-hole alternating current 23, the cable core that links to each other and corresponding circuit; Also comprise down-hole direct current, continuous cable core or outer armor and corresponding circuit; Also have downhole signal source 201, signal transformer T6, continuous cable core and corresponding circuit; Also have downhole signal source 202, signal transformer T8, primary coil and the electric capacity of a secondary coil, two series connection, the cable core that links to each other and corresponding circuit; And the analog signal of down-hole natural potential (SP) signal or other well logging (described primary coil and secondary coil be with respect to described system for the underground power supply used and signal transmission.If described system uploads underground signal, the call of so described primary coil and secondary coil should correspondingly change.But the call of primary coil and secondary coil should not have any impact to protection of the present invention and content.)。
Above ground portion and down-hole part couple together by seven core cable.In this scheme, the Power supply transmission mode can be M1 and/or M3 and/or M6, and the telemetered signal transmission mode can adopt M5 and/or M7.
The transmission mode of this scheme is specially:
The first, with mode 3 transmission first via alternating current, i.e. the alternating current transmission channel of cable core (1,3-5) and (4,2-6) two parallel connections of formation.Under the M3 pattern, the current ratio of distributing on the corresponding cable core is I
1: I
3: I
5: I
4: I
2: I
6=2 :-1 :-1 :-2: 1: 1.First via alternating current can be used as the main alternating current of downhole instrument.Secondly, with pattern 6 transmission the second road alternating current, i.e. cable core (1-3-5) and (2-4-6) formation alternating current transmission channel.Under the M6 pattern, the current ratio of distributing on the corresponding cable core is I
1: I
3: I
5: I
4: I
2: I
6=1: 1: 1 :-1 :-1 :-1.The the second road alternating current can be used as the auxiliary alternating current of downhole instrument.The 3rd, with pattern 1 transmission direct current or low frequency electrode alternating current, namely the centre tap of T3 transformer ( expression cable core 1,2,3,4,5,6 parallel connection) as galvanic positive pole, cable core 10 as galvanic negative pole.Cable core and outer armor by 6 parallel connections are powered to the down-hole DC load.In addition, when the cable core 1,2,3,4,5 of parallel connection, 6 and the earth when forming circuit, described circuit can be to side direction class downhole logging instruments transmission low frequency electrode current (Third Road alternating current).The 4th, pattern 5 (cable core 2-6,3-5) and mode 7 (cable core 7-10) as signal transmission passage.T5 and T6, T7 and T8 are two pairs of signal transformers.When described system transmissions downstream signal, T5 or T7 are coupled to cable to down order from ground level transformer; At this moment, T6 or T8 are the receiving terminal of signal, and they are coupled to downhole instrument to downstream signal from cable.Opposite, when described system transmissions upstream data, T8 or T6 are coupled to cable to the down-hole upward signal; And this moment, T7 or T5 are coupled to ground receiving wastewater facility as receiving terminal and upward signal from cable.In this specific embodiment, the transmitting uplink data rate can surpass 1MBPS, and the downlink data transmission rate can surpass 50KBPS.
In this scheme, T1 and T2, T3 and T4 are two pairs of power transformers.Furtherly, transformer T1 and T3 are on ground, and transformer T2 and T4 are in the down-hole.Ground alternating current 11 is coupled to cable by T1, by T2 down-hole alternating current 21 is coupled to downhole instrument from cable again; In like manner, ground alternating current 12 is coupled to cable by T2, by T4 down-hole alternating current 22 is coupled to downhole instrument from cable again.The transmission channel of Third Road alternating current is formed by the centre tap of ground level transformer T3, continuous cable core, centre tap and the earth of down-hole transformer T4.
Ground alternating current 12 and 13 can be not yet by transformer coupled and directly be transferred to downhole cable, down-hole alternating current 22 and 23 can be not yet by transformer coupled and directly be transferred to downhole load.Also can transmit ground alternating current 13 or direct current by cable conductor 7 and cable outer armor.
Analog signal with cable core 7 transmission natural potentials (SP) or other well loggings.
In this scheme, the passage that transmits main alternating current and auxiliary alternating current can exchange.In addition, the passage of transmission uplink and downlink signal also can exchange or merge or share one of them or use simultaneously two.The passage that transmits main alternating current also can be used for transmitting direct current.This scheme can be expanded use according to the actual requirements, as with pattern 2 and/or pattern 4 for the downhole instrument power supply and/or upload and the signal of lower instrument collection and/or under pass the ground order.
In this scheme, the main ac frequency of transmission be several hertz to upper KHz, general voter is with the alternating current of frequency (50 hertz or 60 hertz).Equally, auxiliary alternating current also can from several hertz to upper KHz, also general voter is with the alternating current of frequency (50 hertz or 60 hertz).In actual applications, do not select main alternating current and the auxiliary alternating current of same frequency.
Other embodiments
Simple modification specific embodiments shown in Figure 4 just can obtain multiple different derived scheme.The scheme of these derivations all belongs to content of the present invention.For example, on embodiment shown in Figure 4, the transmission channel of wiping out alternating current 12 and 22 obtains scheme shown in Figure 5; On embodiment shown in Figure 4, the transmission channel of wiping out signal 102 and 202 obtains scheme shown in Figure 6; On embodiment shown in Figure 4, the transmission channel of wiping out signal 101 and 201 obtains scheme shown in Figure 7.
Embodiment shown in Figure 4 is revised on simple unsubstantiality ground also can obtain multiple different derived scheme.The scheme of these derivations also all belongs to content of the present invention.For example, the circuit of the downhole end of minor modifications embodiment shown in Figure 4 obtains scheme shown in Figure 8.
In sum, one of distinguishing feature of the present invention is that three road alternating currents or while transmitting two paths alternating current and one road direct current can be transmitted simultaneously in described system.Described uplink and downlink telemetered signal can jointly be transmitted also and can separate, and namely described system can provide two road communication ports simultaneously, also can not share but the signal that is transmitted can share a passage.In the present invention, the transmission of power supply supply and signal also can realize by the flexible combination of other pattern.
Two of distinguishing feature of the present invention is circuit design of described transmission system.In the above-described embodiment, ground AC power 11 is coupled on two secondary coils by the primary coil of transformer T1; One utmost point of a secondary coil is connected with cable core 4, and another utmost point of this secondary coil is connected with being connected with the cable core 2 of parallel connection, then forms transmission circuit with the down-hole appropriate section.This method for designing is original creation of the present invention.In like manner, a utmost point of another secondary coil links to each other with cable core 1, and another utmost point of this secondary coil is connected with being connected with the cable core 3 of parallel connection.
One utmost point of ground AC power 13 directly links to each other with the centre tap of the secondary coil of transformer T3 or directly links to each other with two 2/3rds taps of two secondary coils of transformer T1, and another utmost point of power supply links to each other with the earth and forms circuit to circuit supply.Described Third Road alternating current also can be by the circuit transmission of cable conductor 7 and outer armor formation.
When to down-hole DC load transmission direct current, in parallel as the galvanic utmost point of transmission with a cable core or several cable core of described cable, another cable core of described cable or other several cable core parallel connections or outer armor are as another utmost point of transmission current.For example, electric current can form circuit by 6 cable cores and outer armor.The virtual voltage situation is dc source of stack on 6 cables.But consider the insulation voltage situation of cable, the DC voltage that namely guarantees ground adds the maximum alternating current sum of transmitting on the upper ground surface cable core and is no more than the cable insulation restriction.
When described system transmissions electric energy, can select AC power 13 and 23 or direct current also be unique distinction of the present invention.
When the transmission telemetered signal, signal transformer T5 inputs or outputs modulation signal, signal transformer T6 output or input modulating signal.T5 and T6 can transmit descending and/or upstream data.Signal transformer T7 inputs or goes out modulation signal, signal transformer T8 output or input modulating signal, and T7 and T8 also can transmit up and/or downlink data.Dividing two communication ports or using separately a passage to transmit simultaneously two kinds of signals also is notable feature of the present invention.
Claims (23)
1. a downhole logging instrument Power supply and telemetered signal transmission system, wherein, described transmission system comprises:
At least one alternating current transmission circuit, alternating current by transformer coupled to or directly be transferred in the described alternating current transmission circuit, then, provide required alternating current by described alternating current transmission circuit for downhole instrument;
At least one signal circuit, described signal by transformer coupled to or directly be transferred in the described signal circuit, then, by described signal circuit downstream signal is transferred to downhole instrument, perhaps with uplink signal transmissions to ground installation;
Logging cable, described logging cable are used for the signal between transmission ground installation and the downhole instrument and are the downhole instrument power supply;
At least one cable socket circuit, described cable socket circuit is connected to described logging cable two ends, forms at least one transmission circuit; And
Direct current transmission circuit, described direct current transmission circuit with a cable core of described logging cable or several cable core parallel connection as the described galvanic utmost point of transmission, take another cable core of described cable or several cable core parallel connections or outer armor are powered to the down-hole DC load as another utmost point of transmission current in addition.
2. downhole logging instrument Power supply as claimed in claim 1 and telemetered signal transmission system is characterized in that:
The cable core of described cable or cable outer armor have common sparing as the part of one or more described transmission circuits between a described transmission circuit and another the described transmission circuit.
3. downhole logging instrument Power supply as claimed in claim 1 and telemetered signal transmission system is characterized in that:
The alternating current of described different frequency can be by different mode transfer, and same transmission mode can be used for electric energy transmitting and signal simultaneously.
4. downhole logging instrument Power supply as claimed in claim 1 and telemetered signal transmission system is characterized in that:
I.e. the 1st, the 2nd and the 3rd alternating current of described three road alternating currents can be transmitted to downhole instrument simultaneously in described system, or transmits simultaneously described two-way alternating current i.e. the 1st and the 2nd alternating current and described one road direct current; In addition, the passage of transmission uplink and downlink signal also can exchange or merge or share one of them or adopt simultaneously two.
5. such as the described downhole logging instrument Power supply of any one in the claim 1～4 and telemetered signal transmission system, it is characterized in that:
Described cable is seven core cable, and the cable core of described seven core cable is made up, and can form can signal transmission and the various modes of power supply, and namely pattern 1～7.
6. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that,
Comprise the 1st alternating current transmission circuit, the first ground AC power (11) is coupled on two secondary coils by the primary coil of described transformer T1, one utmost point of a secondary coil links to each other with the 4th cable core (4), second of another utmost point of this secondary coil and two other parallel connection links to each other with the 6th cable core (2 and 6), thereby forms circuit with the down-hole part; One utmost point of another secondary coil links to each other with first cable core (1), and the 3rd of another utmost point of this secondary coil and two other parallel connection links to each other with the 5th cable core (3 and 5); The first down-hole AC power (21) is coupled on the secondary coil by two primary coils of described transformer T2, and two utmost points of a secondary coil link to each other with also lower instrument respectively.
7. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
Also comprise the 2nd alternating current transmission circuit, the second ground AC power (12) is coupled on the secondary coil by the primary coil of transformer T3, two utmost points of this secondary coil link to each other with 2/3rds taps on two secondary coils of the first ground power supply (11) respectively, the centre tap of this secondary coil extremely links to each other with one of the 3rd ground AC power (13), described the second ground AC power (12) links to each other with two 2/3rds taps of two secondary coils of transformation T1, is the downhole cable power supply by described the 2nd alternating current transmission circuit; The second down-hole AC power (22) is coupled on the secondary coil by the primary coil of transformer T4, two utmost points by this secondary coil are powered to downhole instrument, the described second also lower AC power (22) links to each other with two 2/3rds taps of two secondary coils of transformer T2, powers to downhole instrument by described the 2nd alternating current transmission circuit.
8. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
Also comprise the 3rd alternating current transmission circuit, one utmost point of the 3rd ground AC power (13) or the 3rd down-hole AC power (23) links to each other with the centre tap of the secondary or primary coil of transformer T3 or T4 or links to each other with two two 2/3rds taps secondary or primary coil of transformer T1 or T2, and another utmost point of described the 3rd ground AC power (13) or the 3rd AC power (23) links to each other with the earth and forms circuit to logging cable or downhole instrument power supply;
Also can transmit described the 3rd alternating current by the 7th cable core (7) of described cable and the circuit of described cable outer armor formation.
9. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
In described direct current transmission circuit, the first～the 6th cable core (1～6) and outer armor form transmission circuit, the DC voltage that i.e. dc source of stack on 6 cables, described transmission circuit satisfy ground adds the maximum alternating current sum of transmitting on the upper ground surface cable core and is no more than the cable insulation restriction.
10. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
In described various transmission modes, the resistance value of pattern 1 and pattern 6 is minimum, so M1 and the most suitable transmission of M6 down-hole electric energy; Mode 3 is had relatively high expectations to the signal driver mode, and resistance is less, so M3 also can be as supplying Electrical Transport; The mode 7 transmission band is the widest, the most suitable signal transmission; Pattern 5 frequency bands are wider, also are fit to signal transmission.
11. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
Described system transmits the alternating current of a kind of frequency or multi-frequency or direct current, only transmits alternating current or only transmit direct current to downhole instrument.
12. downhole logging instrument Power supply as claimed in claim 5 and telemetered signal transmission system is characterized in that:
Described transmission system is transmitted main alternating current and auxiliary alternating current to downhole instrument, can be simultaneously to downhole transmitted direct current and low frequency ac; Described transmission system is carried out the communication of high data volume between down-hole and ground, and can transmission of analogue signal.
13. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
The frequency of described main alternating current and auxiliary alternating current from several hertz to upper KHz, and use main alternating current and the auxiliary alternating current of different frequency.
14. well logging as claimed in claim 13 and lower instrument power source power supply and telemetered signal transmission system is characterized in that:
Described main alternating current and auxiliary alternating current frequency of utilization are generally the civilian alternating current of 50 hertz or 60 hertz.
15. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Mode 3 transmits described one road alternating current, be about to the be together in parallel circuit that forms with the first cable core (1,3-5) and with the second cable core and the 6th cable core alternating current transmission channel in parallel with two of the circuit of the 4th cable core formation (4,2-6) formation that be together in parallel of the 3rd cable core and the 5th cable core, under the M3 pattern, the current ratio of distributing on each cable core is I
1: I
3: I
5: I
4: I
2: I
6=2 :-1 :-1 :-2: 1: 1, described alternating current was as the main alternating current of also lower instrument.
16. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Pattern 6 can be transmitted described another road alternating current, the parallel connection (2-4-6) of the i.e. parallel connection of the first, the 3rd, the 5th cable core (1-3-5) and the second, the 4th, the 6th cable core forms the alternating current transmission channel, under the M6 pattern, the current ratio of distributing on each cable core is I
1: I
3: I
5: I
4: I
2: I
6=1: 1: 1 :-1 :-1 :-1, described another road alternating current is as auxiliary alternating current.
17. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
The pattern 1 described direct current of transmission or described low frequency electrode alternating current, be that cable core 1,2,3,4,5,6 parallel connections are as described galvanic positive pole, cable core 10 is as described galvanic negative pole, described transmission system is powered to the down-hole DC load by 6 cable cores and outer armor, when cable core 1,2,3,4,5, when 6 parallel connections form circuit with the earth, described transmission system is to the low frequency electrode current of downhole instrument transmission well logging, i.e. described the 3rd alternating current.
18. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Pattern 5 and mode 7 are as the passage of signal transmission, and described signal couples a signal to logging cable through transformer, and cable is coupled to receiving system from surveying also with signal through another transformer again.
19. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Described main alternating current arrives transmission circuit by described transformer input and output; Described auxiliary alternating current, can directly not transmit by described transformer to described transmission circuit by described transformer input and output yet; Described direct current directly is linked into transmission circuit; The uplink and downlink signal, can directly not transmit by described transformer to described transmission circuit by described signal transformer input and output yet.
20. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Described cable core (7) is used for the analog signal of transmission natural potential SP or other well loggings.
21. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
The transmission channel of described main alternating current and auxiliary alternating current can be exchanged; The transmission channel of uplink and downlink signal also can exchange or merge or share one of them or adopt simultaneously two.
22. downhole logging instrument Power supply as claimed in claim 12 and telemetered signal transmission system is characterized in that:
Described alternating current transmission channel also can be used in the described direct current of transmission, and can expand the use pattern, namely power for downhole instrument with pattern 2 and/or pattern 4 and/or upload the downhole instrument collection signal or/and under pass the ground order.
23. downhole logging instrument Power supply as claimed in claim 18 and telemetered signal transmission system is characterized in that:
When the transmission telemetered signal, described signal transformer is used for inputing or outputing modulation signal and the descending and/or upstream data of transmission; Use a pair of simultaneously transmission of signal transformer T5, T6 and signal transformer T7, T8 or two pairs to transmit respectively simultaneously up and/or downlink data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100096649A CN101515039B (en) | 2008-02-19 | 2008-02-19 | Underground power supply and signal transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100096649A CN101515039B (en) | 2008-02-19 | 2008-02-19 | Underground power supply and signal transmission system |
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| Publication Number | Publication Date |
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| CN101515039A CN101515039A (en) | 2009-08-26 |
| CN101515039B true CN101515039B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100096649A Active CN101515039B (en) | 2008-02-19 | 2008-02-19 | Underground power supply and signal transmission system |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761334B (en) * | 2009-12-29 | 2013-03-13 | 中国石油集团西部钻探工程有限公司测井公司 | Logging telemetry communication device |
| CN103226206B (en) * | 2012-01-25 | 2018-11-27 | 英洛瓦(天津)物探装备有限责任公司 | Multi-pair power distribution |
| CN102619501B (en) * | 2012-03-27 | 2016-08-17 | 北京石大华旭建邦石油科技有限公司 | A kind of data transmission system in oil logging tool |
| CN102818484A (en) * | 2012-08-17 | 2012-12-12 | 上海航天测控通信研究所 | Ground power supply distribution system for carrier rocket |
| CN105594085B (en) * | 2013-08-09 | 2018-10-09 | 维斯塔斯风力系统集团公司 | Electric energy transmits |
| BR112017027177B1 (en) * | 2015-07-17 | 2022-04-19 | Halliburton Energy Services Inc | Data and power distribution system immune to earth fault, and method for powering downhole sensors |
| CN105259569A (en) * | 2015-10-28 | 2016-01-20 | 西京学院 | Power supply system and method for single well seismic exploration system through adoption of seven-core cable |
| CN107524436B (en) * | 2017-07-03 | 2023-09-08 | 中国石油大学(北京) | Multiplexing device for underground measurement cable through casing and working method thereof |
| 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 |
| CN110847820B (en) * | 2019-11-20 | 2021-09-17 | 中国石油天然气集团有限公司 | While-drilling signal and power supply short transmission system for rotary steering tool |
| CN111636865B (en) * | 2020-06-04 | 2023-04-07 | 河南理工大学 | Data transmission system on logging cable |
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