CN102749490B - Method and device for directly measuring voltage of cable head of downhole instrument - Google Patents
Method and device for directly measuring voltage of cable head of downhole instrument Download PDFInfo
- Publication number
- CN102749490B CN102749490B CN201110099583.4A CN201110099583A CN102749490B CN 102749490 B CN102749490 B CN 102749490B CN 201110099583 A CN201110099583 A CN 201110099583A CN 102749490 B CN102749490 B CN 102749490B
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- direct current
- cable
- cable head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses a device for directly measuring the voltage of a cable head of a downhole instrument, which comprises a measurement transformer used for obtaining voltage signals of the cable head of the downhole instrument, an analog measurement circuit used for converting the obtained alternating-current voltage signals into direct-current signals within the preset amplitude range and outputting the direct-current signals via two paths, a data communication board used for collecting data of direct-current signals in the first path, a remote transmission data processing module used for digital processing of the collected data to obtain the primary-side input alternating-current voltage of the measurement transformer, a remote transmission module used for modulating the primary-side input alternating-current voltage and transmitting modulated signals to a ground system through a well logging cable, and a downhole auxiliary alternating-current transformer with a primary-side center tap coupled with the analog measurement circuit to receive direct-current signals in the second path output by the analog measurement circuit. Output signals of the downhole auxiliary alternating-current transformer are directly transmitted to the ground system through the well logging cable.
Description
Technical field
The invention belongs to oil well logging field, in particular it relates to a kind of cable head of subsurface instrument voltage direct measurement
Method and direct voltage measurement device for cable head of subsurface instrument.
Background technology
In oil well logging instrument, the power of downhole instrument is affected by environment and use condition may be interior in a big way
Change, along with the larger resistance that longer logging cable has, so that the cable end voltage of downhole instrument might have
Large range of change.In order to ensure downhole instrument can normally complete logging operation and in order to protect downhole instrument not to be damaged
Evil, it is necessary to the cable end voltage of downhole instrument is controlled in the range of instrument running voltage is allowed.Otherwise, if cable end is electric
Operating voltage range of the pressure beyond downhole instrument, then the downhole instrument cannot normal work, even can damage the instrument sometimes.
As can be seen here, in well logging, the cable end voltage of real-time monitoring downhole instrument can normally complete well logging to guarantee downhole instrument
Operation becomes a vital task for oil well logging instrument underground power supply system.
At present, the cable end voltage measurement in oil well logging field to downhole instrument mainly adopts indirect measurement method.Wherein
A kind of indirect measurement method be cable tuning method.Its specific implementation is as follows：After the length of logging cable is fixed, first
By head harness（Connect the adapter of downhole instrument and cable）Restart the main electricity of exchange for the two cable cores short circuit of main power source in place
Source, rotation pressure regulator make electric current reach certain numerical value, and the trim-pot adjusted on panel makes voltmeter be designated as zero, afterwards
Short-circuit line is removed, tuning process terminates；Hereafter logging instrument is connected, at this moment voltmeter will show the termination voltage of logging instrument.
Impact measures the no-load voltage ratio that the factor of the precision of cable end voltage mainly has the resistance and transformator of logging cable indirectly.With
The gradually decentralization of logging cable, borehole pressure becomes big, and mud viscosity increases, and now logging cable will be stretched, in addition
As well temperature can become big with the increase of depth, therefore the resistance of logging cable is the amount for changing constantly.In addition, transformator
No-load voltage ratio also can change with the change of load current and temperature.And the change of the no-load voltage ratio of the resistance and transformator of logging cable
Will certainly cause will not be very high via the precision of the cable end voltage measured by indirect measurement method, then can significantly shadow
Ring the effect to logging operation.
In addition to aforementioned indirect measurement method, also there is a kind of direct measuring method of cable end voltage.The direct measurement
Mainly by cable head of subsurface instrument voltage conversion into a direct current signal for being available for measuring collection, the direct current signal passes through well to method
Auxiliary friendship mains transformer in lower the spread of the rumours instrument, well logging ground-based system is sent to then by logging cable carries out data acquisition
（For example can be gathered by the multicycle）.Include corresponding data processing software in well logging ground-based system, which is used to perform accordingly
Data processing obtaining the actual value of cable head of subsurface instrument voltage.
Compared with aforementioned indirect measurement method, although will be through cable transmission in the implementation procedure of above-mentioned direct measuring method
And all too many levels such as data processing, this may bring certain error, but these errors much smaller than indirect to measurement result
The error brought by measuring method.
But, although above-mentioned existing direct measuring method is better than indirect measurement method, but for practical logging work
Speech, the certainty of measurement of the existing direct measuring method are still not high enough, still await further being improved.Additionally, by
High pressure and temperature can be born in oil well in logger, such waterproof grommet just easily aged deterioration, so as to pole
It is possible to cause instrument to seep water, the asymmetrical voltage on two windings of auxiliary alternation depressor, auxiliary alternation depressor may be caused then
Very high alternating voltage can be produced on centre cap.In actual mechanical process, the voltage on two windings is seriously asymmetric
In the case of, the voltage on centre cap may be up to 120 volts, so allow for before ground power supply protection system action,
The corresponding components and parts that so high voltage can be damaged in downhole telemetry tool instrument, and then cable head of subsurface instrument voltage measurement can be caused to send out
Raw gross error, so as to affect being smoothed out for logging operation.
The content of the invention
It is an object of the invention in order to solve said one present in prior art or multiple deficiencies, there is provided Yi Zhongxin
, the direct voltage measurement device for cable head of subsurface instrument and method for being capable of accurate measurement cable head of subsurface instrument voltage.
According to an aspect of the invention, there is provided a kind of direct voltage measurement device for cable head of subsurface instrument, the device bag
Include：
Measuring transformer, which is used to obtain cable head of subsurface instrument voltage signal；
Analog measuring circuit, which is used to be converted into being in by the cable head of subsurface instrument voltage signal of acquired form of communication
Direct current signal in the range of predetermined amplitude；The analog measuring circuit point two-way exports the direct current signal；
Data communication board, which is used to carrying out data to the first via direct current signal for coming from the analog measuring circuit to adopt
Collection；
The spread of the rumours data processing module, its data for being used to collect the data communication board carry out digital processing, from
And obtain the former limit input ac voltage value of the measuring transformer；
The spread of the rumours module, its former limit input for being used for the measuring transformer obtained to the spread of the rumours data processing module are handed over
Stream magnitude of voltage is modulated and modulated signal is sent to ground system via logging cable；
The auxiliary alternation depressor in down-hole, its former limit centre cap are coupled to the analog measuring circuit, are surveyed with receiving the simulation
The second road direct current signal that amount circuit is exported；The output signal of the auxiliary alternation depressor in the down-hole is directly transmitted by logging cable
To ground system.
Preferably, the first via for being transmitted via the data communication board, the spread of the rumours data processing module and the spread of the rumours module
Direct current signal only logging system power-up complete and the spread of the rumours module communication set up after the completion of could be by by logging cable
It is sent to ground system.
Preferably, via the transmission of the auxiliary alternation depressor in the down-hole the second road direct current signal logging system whole power-up
During and power-up after the completion of exist.
Preferably, before the power-up of logging system is completed, the ground system will show
The down-hole cable end magnitude of voltage for sending；After the completion of the power-up of logging system, the ground system will show
Number transmission down-hole cable end magnitude of voltage.
Preferably, the analog measuring circuit includes partial pressure unit, and the partial pressure unit is for the measuring transformer
Output signal carry out partial pressure.
Preferably, the analog measuring circuit also includes the first low-pass filter unit coupled with the partial pressure unit, institute
State the first low-pass filter unit and constitute fourth order low-pass filter unit, for the target signal filter higher hamonic wave after partial pressure point
Amount.
Preferably, the analog measuring circuit also includes filtering direct current biasing with first low-pass filter unit is coupled
Unit, which is used to carrying out direct current biasing to the signal after the first Filtering Processing to filter operation.
Preferably, the analog measuring circuit also includes halfwave rectifier unit and the second low-pass filter unit, the half-wave
Signal after rectification unit is filtered to direct current biasing carries out halfwave rectifier, and second low-pass filter unit is to Jing halfwave rectifier
Signal afterwards carries out low-pass filtering so as to be transformed into d. c. voltage signal.
Preferably, the analog measuring circuit also includes penetrating with circuit and scaling unit, described to penetrate with the defeated of circuit
Enter end and be coupled to second low-pass filter unit, outfan is coupled to the scaling unit；The scaling unit
Including high-voltage AC signal protection location, the high-voltage AC signal protection location includes the first high voltage protective electricity of parallel coupled
Resistance and the second high voltage protective resistance.
According to another aspect of the present invention, there is provided a kind of cable head of subsurface instrument voltage direct measuring method, the method
Comprise the steps：
Step 101, obtains cable head of subsurface instrument voltage signal by using measuring transformer；
Step 102, the cable head of subsurface instrument voltage signal of the form of communication of acquisition is converted into meeting downhole instrument work
The direct current signal in the range of predetermined output amplitude for requiring；
Step 103, point two-way export the direct current signal, and first via direct current signal therein is transported to downhole telemetry tool instrument
The data communication board of device；
Step 104, carries out data acquisition to the first via direct current signal by the data communication board；
The data for being collected are carried out digital processing by the spread of the rumours data processing module by step 106；
Data after the process of the spread of the rumours data processing module are modulated and via well logging by step 108 by the spread of the rumours module
Cable is sent to ground system；
Second road direct current signal is transported to the former limit centre cap of the auxiliary alternation depressor in down-hole by step 105；
Step 107, second road direct current signal are transferred directly to ground system via logging cable；
Step 109, the data signal received from logging cable is demodulated by ground system, data acquisition and
Data are fitted, and finally obtain cable head of subsurface instrument voltage；
Step 110, judges whether logging system power-up completes
If the judged result of step 110 is yes, adopts into step 111, i.e. ground system and show via first
The cable head of subsurface instrument magnitude of voltage that road direct current signal is obtained；
If the judged result of step 110 is no, adopts into step 112, i.e. ground system and show via second
The cable head of subsurface instrument magnitude of voltage that road direct current signal is obtained.
A purpose of the invention, by adopting technical scheme, can greatly improve downhole instrument cable
The certainty of measurement of head voltage, and then can effectively ensure being smoothed out for logging operation.
Another purpose of the invention, by adopting the preferred technical solution of the present invention, can solve prior art
Produce on centre cap when the fortuitous events such as downhole instrument infiltration for example occur due to auxiliary alternation depressor exist larger
Alternating voltage and damage the technical problem of the components and parts of downhole instrument, so as to both can effectively ensure smoothly entering for logging operation
OK, downhole instrument can be protected without damage again.
Another purpose of the invention, direct voltage measurement device for cable head of subsurface instrument provided by the present invention have
The advantage of low cost and high workload reliability, therefore there is very strong practicality in oil well logging field.
Description of the drawings
Fig. 1 is logging system power delivery and signal communication schematic diagram.
Fig. 2 is the schematic block diagram of direct voltage measurement device for cable head of subsurface instrument according to the preferred embodiment of the invention.
Fig. 3 is the analogue measurement electricity in direct voltage measurement device for cable head of subsurface instrument according to the preferred embodiment of the invention
The circuit theory diagrams on road.
Fig. 4 is the FB(flow block) of cable head of subsurface instrument voltage direct measuring method according to the preferred embodiment of the invention.
Specific embodiment
Some terms are used to refer to particular system component in present specification from start to finish.Such as those skilled in the art
It will be recognized that as, identical part generally can be indicated with different titles, thus present specification is not intended to difference
Those are in nominally different rather than functionally different parts.In present specification, made with open form
With term " including ", "comprising" and " having ", and therefore should be construed as meaning " including but not limited to ... ".
Below in conjunction with the preferred embodiments of the present invention, the present invention is described in further detail.
First, survey will be briefly described with reference to attached logging system power delivery illustrated in fig. 1 and signal communication schematic diagram
The big electrical signal trend of well system.
As shown in figure 1, T1 is the main friendship mains transformer in ground, which is used to for ground main alternating current power supply to be coupled to cable.T2、
T3 is the main friendship mains transformer in downhole telemetry tool instrument, and which is used to for the main alternating current power supply on cable to be coupled to downhole instrument.
T4 is the auxiliary friendship mains transformer in ground, and which is used to for ground auxiliary alternating current power supply to be coupled to cable.During T5 is downhole telemetry tool instrument
Auxiliary friendship mains transformer, which is used to for the auxiliary alternating current power supply on cable to be coupled to downhole instrument；Preferably, the T5 is to carry
The transformator of core tap, in the case where processing technology is good（As ideally）, its both sides almost symmetry, with very little
Deviation；Additionally, in the case of downhole instrument normal work, the SMIS tap voltage-to-ground is very little.T6 and T8 are
Ground signal transformator, which is used for output or input modulating signal, and for transmitting up and/or downstream signal.T7 and T9
For the signal transformer in downhole telemetry tool instrument, which is used for output or input modulating signal, and for transmit it is up and/or under
Row signal.
Additionally, #1-the #7 in Fig. 1 is logging cable, which is used to for ground system power supply to be transported to downhole telemetry tool instrument
Device, is then powered to other downhole instruments by downhole telemetry tool instrument, while these cables are also ground system and downhole instrument
Carry out the passage of data exchange.
Next will be explained in the direct voltage measurement device for cable head of subsurface instrument of the present invention.
Fig. 2 shows the schematic frame of direct voltage measurement device for cable head of subsurface instrument according to the preferred embodiment of the invention
Figure.As shown in Fig. 2 the direct voltage measurement device for cable head of subsurface instrument of the present invention preferably includes measuring transformer 201, simulation
The auxiliary alternation depressor of measuring circuit 202, data communication board 203, down-hole 204（In downhole telemetry tool instrument preferably shown in Fig. 1
Auxiliary friendship mains transformer T5）, the spread of the rumours module 205 and the spread of the rumours number between data communication board 203 and the spread of the rumours module 205
According to processing module 206.
The measuring transformer 201 is used to obtain cable head of subsurface instrument voltage signal；The analog measuring circuit 202 is used for
Partial pressure, filtering, rectification, scale up operation are carried out, is converted into meeting downhole instrument will enter into ac voltage signal therein
The direct current signal in the range of predetermined output amplitude of device job requirement.
As shown in Fig. 2 202 points of two-way of analog measuring circuit export the direct current signal, direct current signal S1 all the way therein
（As the first direct current signal S1）Data communication board 203 is transported to, the direct current signal on data communication board 203 to being input into
S1 carries out data acquisition, then enters line number to the data collected by data communication board 203 through the spread of the rumours data processing module 206
Word processing（Preferably, the digital processing is to carry out fitting of a polynomial to the d. c. voltage signal after the rectification that collects, so as to
Obtain the former limit input ac voltage value of measuring transformer 201）, afterwards via the spread of the rumours module 205 to the spread of the rumours data processing module
Data after 206 process are modulated and are sent to ground system 208 via logging cable 207（For simplicity's sake, do not show in figure
Go out, it is therefore preferable to ground system the spread of the rumours case）.Ground system 208 will be solved to the data signal received from logging cable 207
Tune, data acquisition, data fitting, finally obtain cable head of subsurface instrument voltage.
It should be noted that aforesaid via data communication board 203, the spread of the rumours data processing module 206, and the spread of the rumours module
205 that circuit-switched data signal S1 for being transmitted must be completed in logging system power-up, the communication of the spread of the rumours module 205 set up after the completion of
Ground system 208 can be sent to by logging cable 207.
As shown in Fig. 2 another road direct current signal S2 that analog measuring circuit 202 is exported is transported to the auxiliary alternation pressure in down-hole
The former limit centre cap of device 204, is then transferred directly to the alternating current power supply control chamber of ground system 208 by logging cable 207
Data acquisition, data fitting are carried out, cable head of subsurface instrument voltage is finally obtained, the road signal transmission adds in the whole of logging system
In electric process（Before i.e. power-up is completed）And exist after the completion of power-up, that is to say, that in the whole power-up procedures of logging system
And cable end voltage signal can be transmitted by the road signal transmission path after the completion of power-up.
Here is it should be noted that above-mentioned direct current signal S1, S2 are derived from same signal source（Analog measuring circuit 202）
Two paths of signals, its by it is as above it is different in the way of and different signal paths be transmitted.For example, the second direct current signal
S2 is transmitted with analog signaling, and which is before the power-up of logging system is completed（I.e. in power-up procedures）By ground system
208 adopt, and after the completion of the power-up of logging system, signal S2 is still being transmitted always, and simply ground system is no longer adopted
And show the value of the signal.And above-mentioned first direct current signal S1 is applied at the data such as digitized and fitting of a polynomial in down-hole
Reason, is transmitted after the completion of the whole power-up of logging system in the way of digital signal afterwards；When the power-up of logging system it is complete
Cheng Hou, the communication between ground system and downhole telemetry tool instrument set up and complete, and now ground system will show
The down-hole cable end magnitude of voltage for sending.
In order to clearly illustrate technical scheme, further illustrate below in conjunction with accompanying drawing 3 according to this
The preferable configuration of the analog measuring circuit 202 in the direct voltage measurement device for cable head of subsurface instrument of invention preferred embodiment.
Fig. 3 shows that the simulation in direct voltage measurement device for cable head of subsurface instrument according to the preferred embodiment of the invention is surveyed
The circuit theory diagrams of amount circuit 202.
As shown in figure 3, analog measuring circuit 202 preferably include partial pressure unit 2021, the first low-pass filter unit 2022,
Filter direct current biasing unit 2023, halfwave rectifier unit 2024, the second low-pass filter unit 2025, penetrate with circuit 2026, and ratio
Example amplifying unit 2027.
Wherein the partial pressure unit 2021 preferably includes first resistor R23, second resistance R24 and 3rd resistor R49.
First low-pass filter unit 2022 is preferably fourth order low-pass filter unit, and which preferably includes the 4th resistance
R52, the 5th resistance R51, the first operational amplifier U2A, the first electric capacity C22, the second electric capacity C23 are the 6th resistance R47, the 7th electric
Resistance R46, the 8th resistance R48, the 3rd electric capacity C13, the 4th electric capacity C24, the 9th resistance R59, and the second operational amplifier U2D.
The direct current biasing unit 2023 that filters preferably includes the tenth resistance R5, the 3rd operational amplifier U1A, the 11st
Resistance R1, the 5th electric capacity C1, the 6th electric capacity C2, the first diode D1, and the 12nd resistance R6, the 13rd resistance R7, the tenth
Four resistance R8.
The halfwave rectifier unit 2024 is preferably made up of the second diode D2.
Second low-pass filter unit 2025 preferably includes the 15th resistance R4, the 7th electric capacity C3, the 16th resistance
R11 and the 8th electric capacity C4.
Described penetrating preferably includes the 17th resistance R2, four-operational amplifier U1D with circuit 2026, and the 18th electric
Resistance R10.
The scaling unit 2027 preferably includes the 19th resistance R62, the 20th resistance R64, and the 21st is electric
Resistance R66, the 5th operational amplifier U3D, the 22nd resistance R58, the 23rd resistance R63, the 6th operational amplifier U3A, with
And the first high voltage protective resistance R65 and the second high voltage protective resistance R67.
It should be noted that the setting value of each circuit components marked in accompanying drawing 3 is only preferred, which only plays and shows
The effect of example property, and do not constitute limiting the scope of the invention.
The signal trend of circuit shown in Fig. 3 is further described below.
As shown in figure 3, output signal AC1+, AC- of the measuring transformer 201 in Fig. 2 is imported into analog measuring circuit
In 202, the partial pressure unit 2021 that Jing above-mentioned R23, R24, R49 are constituted carries out partial pressure, after above-mentioned first low-pass filter units of Jing
The 2022 fourth order low-pass filter units for being constituted to the target signal filter higher harmonic components after partial pressure, through first filtering
Signal AD1in after process be imported into it is above-mentioned carry out direct current biasing in filtering direct current biasing unit 2023 and filter operation, by
D2 carries out halfwave rectifier come the signal after filtering to direct current biasing, and the signal after halfwave rectifier is by above-mentioned second low-pass filtering list
Unit 2025 carries out low-pass filtering so as to be transformed into d. c. voltage signal, and following d. c. voltage signal is penetrated with circuit through above-mentioned
2026 form signal AC-Voltage1, and signal AC-Voltage1 is on the one hand directly as above-mentioned output signal S1（I.e. first
Output signal S1）Export in the data communication COM plates 203 shown in Fig. 2；On the other hand, signal AC-Voltage1 is passed through
Aforementioned proportion amplifying unit 2027 is formed and amplifies output signal AC-V1（That is the second output signal S2）, amplification output signal AC-
The centre cap of the auxiliary alternation depressor in down-hole that V1 signals are output in Fig. 2 204.
From above preferred embodiment, the scaling unit 2027 is preferably included by the first high voltage protective resistance
The high-voltage AC signal protection location 20271 that R65 and the second high voltage protective resistance R67 is constituted.
As shown in figure 3, a resistance R67 in described two high voltage protective resistance is connected to the 6th operational amplifier U3A
Outfan and ground between, another R65 is connected between the 6th operational amplifier and output signal transmission cable CAB.
The resistance of above-mentioned first high voltage protective resistance R65 and the second high voltage protective resistance R67 can be by people in the art
Member is according to the output impedance of the 6th operational amplifier U3A, output signal transmission cable cable core ground insulation resistance, ground system
The input impedance of the signal input circuit in land-based AC power control chamber in 208, the pole of the 6th operational amplifier U3A outputs
When the amplitude range of the direct-flow output signal of voltage limit, and/or the output of analog measuring circuit 202, downhole instrument seep water, down-hole is auxiliary
Alternating voltage amplitude range on the centre cap of alternation depressor 204 is being determined.According to a preferred embodiment of the invention,
The resistance of one high voltage protective resistance R65 is 20K ohms, and the resistance of the second high voltage protective resistance R67 is 1K ohms.However, should
Numerical value is preferred value, and which only plays exemplary effect, and the present invention does not limit to and this.
In downhole instrument normal work, the direct current signal that the two high voltage protective resistance are exported to the 6th operational amplifier
Affect it is very little, now the amplitude of direct current signal 0-8.5 volt between, the output voltage permissible range of the 6th operational amplifier
Between-18 -+18 volts, therefore, during normal work, the 6th operational amplifier U3 will not be damaged.
When downhole instrument seeps water, the auxiliary alternation depressor in down-hole 204（T5 in as Fig. 1）The voltage on centre cap both sides is not
Symmetrically, therefore on centre cap there is a larger alternating voltage, which is superimposed upon on direct current signal, the alternating voltage
Amplitude would generally be between 6-120 volts, if now no above-mentioned high-voltage AC signal protection location 20271, the 6th output
Operational amplifier U3 will be damaged by ac high-voltage before the protection circuit action of ground system.And be provided with according to the present invention
After the high-voltage AC signal protection location 20271 of preferred embodiment, ac high-voltage can be by resistance R65 and R67 partial pressure, according to this
Bright preferred embodiment, as the resistance of resistance R65 is 20K, the resistance of R67 is 1K, therefore, electricity of the AC signal on R67
Pressure contribution is lied prostrate for 0-6, and along with direct-flow signal voltage, its amplitude is less than 18 volts of the damage voltage of the 6th operational amplifier, because
This 6th operational amplifier is able to be protected.
Cable head of subsurface instrument voltage direct measurement side according to the preferred embodiment of the invention is illustrated below in conjunction with Fig. 4
Method.
As shown in figure 4, in frame 101, cable head of subsurface instrument voltage signal is obtained by using measuring transformer.
In block 102, by using analog measuring circuit carrying out to the AC signal that the measuring transformer is exported point
Pressure, filtering, rectification, scale up operation, by the AC signal be converted into meeting downhole instrument job requirement in pre-
Determine the direct current signal in the range of output amplitude.
In frame 103, the analog measuring circuit point two-way is made to export the direct current signal, direct current signal all the way therein
S1（That is the first direct current signal）It is transported to the data communication board 203 of downhole telemetry tool instrument, another road direct current signal S2（I.e. second
Direct current signal）It is transported to the former limit centre cap of the auxiliary alternation depressor in down-hole 204.
In frame 104, data acquisition is carried out to the first direct current signal S1 by the data communication board.
In frame 106, digital processing is carried out to the data for being collected by the spread of the rumours data processing module.
In block 108, the data after the process of the spread of the rumours data processing module are modulated and via survey by the spread of the rumours module
Well cable is sent to ground system.
In block 105, the second direct current signal S2 that analog measuring circuit 202 is exported is transported to into the auxiliary alternation depressor in down-hole
204 former limit centre cap.
In frame 107, the second direct current signal S2 is transferred directly to ground system 208 via logging cable.
In frame 109, by ground system 208（Preferably by the alternating current power supply control chamber of ground system）To from well logging
Cable reception to data signal be demodulated, data acquisition and data fitting, finally obtain cable head of subsurface instrument voltage.
In block 110, judge whether logging system power-up completes
If the judged result of frame 110 is yes, adopts into frame 111, i.e. ground system and show via the first direct current
The cable head of subsurface instrument magnitude of voltage that signal S1 is obtained；
If the judged result of frame 110 is no, adopts into frame 112, i.e. ground system and show via the second direct current
The cable head of subsurface instrument magnitude of voltage that signal S2 is obtained.
In sum, the measurement of cable head of subsurface instrument voltage can by adopting technical scheme, be greatly improved
Precision, and then can effectively ensure being smoothed out for logging operation.
Additionally, by adopting the preferred technical solution of the present invention, can solve prior art presence, for example there is well
Damage down-hole due to larger alternating voltage being produced on the centre cap of auxiliary alternation depressor during the fortuitous events such as lower instrument infiltration
The technical problem of the components and parts of instrument, so as to both can effectively ensure being smoothed out for logging operation, can protect down-hole again
Instrument is without damage.
Furthermore, direct voltage measurement device for cable head of subsurface instrument provided by the present invention has low cost and high workload reliability
Property advantage, therefore oil well logging field have very strong practicality.
Described above is only the preferred embodiments of the present invention, so that those skilled in the art can realize or use
Present disclosure.For simultaneously for those skilled in the art, to the various modifications of these disclosures be all it is aobvious and
It is clear to.On the premise of without departing from the spirit and scope of the present invention, those skilled in the art can obtain other modified, changes
The equivalents thereto change, replaced, all such modifications, conversion, replacement are each fallen within protection scope of the present invention.
Claims (10)
1. a kind of direct voltage measurement device for cable head of subsurface instrument, it is characterised in that the device includes：
Measuring transformer（201）, which is used to obtain cable head of subsurface instrument voltage signal；
Analog measuring circuit（202）, which is used to for the cable head of subsurface instrument voltage signal of acquired form of communication to be converted into place
Direct current signal in the range of predetermined amplitude；The analog measuring circuit（202）Two-way is divided to export the direct current signal；
Data communication board（203）, which is used for coming from the analog measuring circuit（202）First via direct current signal（S1）Enter
Row data acquisition；
The spread of the rumours data processing module（206）, which is used for the data communication board（203）The data for being collected carry out digital place
Reason, so as to obtain the measuring transformer（201）Former limit input ac voltage value；
The spread of the rumours module（205）, which is used for the spread of the rumours data processing module（206）The measuring transformer for obtaining（201）
Former limit input ac voltage value be modulated and via logging cable（207）Modulated signal is sent to into ground system（208）；
The auxiliary alternation depressor in down-hole（204）, its former limit centre cap is coupled to the analog measuring circuit（202）, it is described to receive
Analog measuring circuit（202）The the second road direct current signal for being exported（S2）；The auxiliary alternation depressor in the down-hole（204）Output signal
By logging cable（207）It is transferred directly to ground system（208）.
2. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that logical via the data
Letter plate（203）, the spread of the rumours data processing module（206）, and the spread of the rumours module（205）The first via direct current signal for being transmitted（S1）Only
Have and complete and the spread of the rumours module in logging system power-up（205）Communication set up after the completion of could be by by logging cable（207）
It is sent to ground system（208）.
3. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1 or 2, it is characterised in that via the well
Under auxiliary alternation depressor（204）Second road direct current signal of transmission（S2）In the whole power-up procedures of logging system and power-up complete
Afterwards by by logging cable（207）It is sent to ground system（208）.
4. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 3, it is characterised in that when logging system plus
Before electricity is completed, the ground system（208）To show via the second road direct current signal（S2）The down-hole cable end magnitude of voltage of transmission；When
After the completion of the power-up of logging system, the ground system will be shown via first via direct current signal（S1）The down-hole cable end electricity of transmission
Pressure value.
5. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that the analogue measurement electricity
Road（202）Including partial pressure unit（2021）, the partial pressure unit（2021）For to the measuring transformer（201）Output letter
Number（AC1+, AC-）Carry out partial pressure.
6. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that the analogue measurement electricity
Road（202）Also include and the partial pressure unit（2021）First low-pass filter unit of coupling（2022）, first low pass filtered
Ripple unit（2022）Fourth order low-pass filter unit is constituted, for the target signal filter higher harmonic components after partial pressure.
7. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that the analogue measurement electricity
Road（202）Also include and first low-pass filter unit（2022）What is coupled filters direct current biasing unit（2023）, which is used for
To the signal after the first Filtering Processing（AD1in）Carry out direct current biasing and filter operation.
8. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that the analogue measurement electricity
Road（202）Also include halfwave rectifier unit（2024）With the second low-pass filter unit（2025）, the halfwave rectifier unit is to straight
Signal after stream biasing is filtered carries out halfwave rectifier, second low-pass filter unit（2025）To the letter Jing after halfwave rectifier
Number low-pass filtering is carried out so as to be transformed into d. c. voltage signal.
9. direct voltage measurement device for cable head of subsurface instrument as claimed in claim 1, it is characterised in that the analogue measurement electricity
Road（202）Also include penetrating with circuit（2026）With scaling unit（2027）, it is described to penetrate with circuit（2026）Input coupling
Close second low-pass filter unit（2025）, outfan is coupled to the scaling unit（2027）；The ratio is put
Big unit（2027）Including high-voltage AC signal protection location（20271）, the high-voltage AC signal protection location（20271）Bag
Include the first high voltage protective resistance of parallel coupled（R65）With the second high voltage protective resistance（R67）.
10. a kind of cable head of subsurface instrument voltage direct measuring method, it is characterised in that methods described includes step：
Step 101, obtains cable head of subsurface instrument voltage signal by using measuring transformer；
Step 102, the cable head of subsurface instrument voltage signal of the form of communication of acquisition is converted into meeting downhole instrument job requirement
The direct current signal in the range of predetermined output amplitude；
Step 103, point two-way export the direct current signal, first via direct current signal therein（S1）It is transported to downhole telemetry tool instrument
The data communication board of device（203）；
Step 104, by the data communication board（203）To the first via direct current signal（S1）Carry out data acquisition；
The data for being collected are carried out digital processing by the spread of the rumours data processing module by step 106；
Data after the process of the spread of the rumours data processing module are modulated and via logging cable by step 108 by the spread of the rumours module
It is sent to ground system；
Step 105, by the second road direct current signal（S2）It is transported to the auxiliary alternation depressor in down-hole（204）Former limit centre cap；
Step 107, second road direct current signal（S2）Ground system is transferred directly to via logging cable（208）；
Step 109, by ground system（208）Data signal to receiving from logging cable is demodulated, data acquisition and
Data are fitted, and finally obtain cable head of subsurface instrument voltage；
Step 110, judges whether logging system power-up completes
If the judged result of step 110 is yes, into step 111, i.e. ground system（208）Using and show via first
Road direct current signal（S1）The cable head of subsurface instrument magnitude of voltage for obtaining；
If the judged result of step 110 is no, adopt and show straight via the second tunnel into step 112, i.e. ground system
Stream signal（S2）The cable head of subsurface instrument magnitude of voltage for obtaining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110099583.4A CN102749490B (en) | 2011-04-18 | 2011-04-18 | Method and device for directly measuring voltage of cable head of downhole instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110099583.4A CN102749490B (en) | 2011-04-18 | 2011-04-18 | Method and device for directly measuring voltage of cable head of downhole instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102749490A CN102749490A (en) | 2012-10-24 |
| CN102749490B true CN102749490B (en) | 2017-04-12 |
Family
ID=47029845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110099583.4A Active CN102749490B (en) | 2011-04-18 | 2011-04-18 | Method and device for directly measuring voltage of cable head of downhole instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102749490B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787138B (en) * | 2016-12-26 | 2023-08-29 | 中石化江汉石油工程有限公司 | Multifunctional power supply control system of underground logging instrument |
| CN107178359B (en) * | 2017-06-28 | 2023-10-24 | 广东迅维科技发展有限公司 | Coiled tubing real-time intelligent logging system with optical cable |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4876539A (en) * | 1983-08-15 | 1989-10-24 | Oil Dynamics, Inc. | Parameter telemetering from the bottom of a deep borehole |
| CN2881754Y (en) * | 2005-11-04 | 2007-03-21 | 西安奥华电子仪器有限责任公司 | Underground cable voltage constant voltage control circuit of petroleum logging instrument |
| US7649474B1 (en) * | 2005-11-16 | 2010-01-19 | The Charles Machine Works, Inc. | System for wireless communication along a drill string |
| CN201041586Y (en) * | 2007-05-21 | 2008-03-26 | 中国石油天然气集团公司 | A thick film circuit for monitoring cable header voltage and instrument temperature |
| CN201297168Y (en) * | 2008-11-18 | 2009-08-26 | 西安威盛电子仪器有限公司 | A petroleum well logging field ground system adaptive signal processing circuit |
| CN202093083U (en) * | 2011-04-18 | 2011-12-28 | 中国石油集团长城钻探工程有限公司 | Direct voltage measurement device for cable head of subsurface instrument |
-
2011
- 2011-04-18 CN CN201110099583.4A patent/CN102749490B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102749490A (en) | 2012-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101907437B (en) | Wavelet difference algorithm-based cable fault localization method | |
| CN110231552A (en) | Coal mine cable insulating monitoring selection method, injection circuit and related device | |
| CN205246764U (en) | Open -phase detecting circuit of polyphase source | |
| MX2008015823A (en) | Sensing current flowing through a power line. | |
| CN203012073U (en) | Power distribution network line fault positioning system | |
| CN102749490B (en) | Method and device for directly measuring voltage of cable head of downhole instrument | |
| CN104989381A (en) | Soft measuring method and device for stroke period of beam-pumping unit | |
| CN107797007B (en) | Verification system and verification method for on-site capacitive equipment on-line monitoring device | |
| CN205157637U (en) | Generator carbon brush current distribution monitoring system | |
| CN202393837U (en) | Cable dielectric loss measuring device based on frequency conversion series resonance | |
| CN107450042A (en) | A kind of current transformer detecting system | |
| CN206411250U (en) | A kind of DC electronic current transformer digitizes real-time calibration equipment | |
| CN103439682B (en) | A kind of portable type current transformer combination misalignment proving installation is adopted to carry out the method for methods of composite errors on current transformer test | |
| CN103260263A (en) | Metro stray current wireless monitoring system and method | |
| CN207882393U (en) | A kind of power distribution network crosslinking polyethylene-insulated cable insulation state monitoring apparatus | |
| AT509440A1 (en) | CONNECTION DEVICE FOR CONNECTING ELECTRICAL POWER SUPPLY LINES TO DRILLING AND PRODUCTION PLANTS | |
| CN203978425U (en) | A kind of wireline logging HRT high-rate telemetry communication apparatus | |
| CN109060005B (en) | Intelligent acquisition system for large building structure safety | |
| CN202093083U (en) | Direct voltage measurement device for cable head of subsurface instrument | |
| CN208721743U (en) | A kind of Assembled high-voltage shunted capacitor set detecting device | |
| CN208383984U (en) | A kind of intelligent electric meter | |
| CN207352068U (en) | Track-circuit signalling detection device | |
| CN103334743B (en) | A kind of formation tester ground control system | |
| CN104251946A (en) | Remote hand-held terminal and power line identification method thereof | |
| CN205384348U (en) | Portable intelligent four -channel partial discharge detection appearance signal frequency changes leading module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |