CN103590825A - Transient electromagnetic well-logging probe detection system - Google Patents
Transient electromagnetic well-logging probe detection system Download PDFInfo
- Publication number
- CN103590825A CN103590825A CN201310511241.8A CN201310511241A CN103590825A CN 103590825 A CN103590825 A CN 103590825A CN 201310511241 A CN201310511241 A CN 201310511241A CN 103590825 A CN103590825 A CN 103590825A
- Authority
- CN
- China
- Prior art keywords
- power
- probe
- device igbt
- transient electromagnetic
- detection system
- 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.)
- Pending
Links
Images
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a transient electromagnetic well-logging probe detection system. The transient electromagnetic well-logging probe detection system comprises a control circuit, a high-power on-off device IGBT (insulated gate bipolar transistor), a driving circuit of the high-power on-off device IGBT, a to-be-detected probe measuring circuit and a high-power direct-current power supply. The high-power direct-current power supply, the high-power on-off device IGBT and a to-be-detected form a main loop, the high-power on-off device IGBT is connected with the control circuit through the driving circuit of the high-power on-off device IGBT, a transmitting coil is arranged in the to-be-detected probe, and a receiving coil is arranged in the measuring circuit. The transient electromagnetic well-logging probe detection system has the advantages that transient parameters of an electromagnetic well-logging probe are measured to obtain linear and magnetic saturation regions of the probe, high-power excitation characteristics of the probe can be effectively evaluated, design parameters are provided for designing a supporting high-power excitation circuit, and requirements for detecting the detecting probe are met.
Description
Technical field
The present invention relates to oil well logging instrument corollary system field, the probe measurement system of a kind of transient electromagnetic logger that the instrumentation specifically measured for the sleeve pipe quality examination of open hole well and cased well, open hole well and cased hole formation resistivity is supporting, by measuring magnetization curve, obtain the range of linearity, the magnetic saturation region of electromagnetic probe, realize the probe of transient electromagnetic logger is detected.
Background technology
In the process of petroleum exploration & development, the resistivity on sleeve pipe borehole measurement stratum, evaluating oil saturation is the important means of understanding remaining oil distribution.In the prior art, TCR is measured the DC electrode method that adopts.The method gives the electrode that pushes against the borehole wall for larger electric current, requiring must have good contacting between electrode and the borehole wall, for this reason, before well logging, want first well-flushing and with drift size gauge tool, well inwall carried out to pipe cleaning, between electrode and casing wall, can contact well the harsh requirement of electrode method through casing resistivity logging to sleeve pipe quality guaranteeing.
For a long time, when induction logging be take, humorous is basis, adopt steady-state sine ripple (humorous change) electromagnetic field exciting to carry out the measurement of electrical conductivity, from common induction, two induction, array induction to Russian high-frequency induction, its frequency exciting is increased to 2MHz from 20kHz, is unifrequency or discrete frequency.When the sinusoidal signal of transmitting runs into sleeve pipe, due to kelvin effect, sine wave and the electromagnetic wave signal of induction logging and the transmitting of electromagnetic wave logging instrument cannot enter stratum through sleeve pipe at all.For this reason, conventional induction well logging method is only applicable to open-hole logging.
Summary of the invention:
The present invention be directed to the high-power coil existing in prior art and there is the problems such as non-linear and magnetic saturation, a kind of system under high-power state, the probe parameter of transient electromagnetic logger being detected is proposed, for the design energizing circuit supporting with it provides foundation and design parameter.
Technical scheme of the present invention is
Transient electromagnetic well-logging probe detection system is by the drive circuit of control circuit, high-power break-make device IGBT, high-power break-make device IGBT, probe measurement circuit to be measured and high-power DC power supply, wherein: high-power DC power supply, high-power break-make device IGBT and probe to be measured form major loop, high-power break-make device IGBT is connected with control circuit by the drive circuit of high-power break-make device IGBT, in probe to be measured, be provided with transmitting coil, in measuring circuit, be provided with receiving coil.
Its operating principle is: control circuit produces square wave, this square wave produces the driving signal that can drive IGBT device break-make by the drive circuit of high-power break-make device IGBT, at this, drive under signal function, IGBT device is realized break-make, thereby form high voltage in the major loop of IGBT, large electric current is powerful break-make, this high-power signal is added in transmitting coil on probe to be measured, at large electric current, disconnect the transient electromagnetic field (square wave rises and trailing edge) of its generation of moment, receiving coil in the measured circuit of this transient electromagnetic field receives, form measuring-signal, get the maximum of this measuring-signal as measurement result.By changing in major loop, be added in the DC voltage on coil, the maximum of measuring-signal, sets up the functional relation of this maximum and add transient voltage, and its range of linearity is effective excitation area of probe, the magnetic saturation region of nonlinear area for popping one's head in.This relation has reflected magnetic material initial magnetization curve variation characteristic.
Such scheme also comprises that described control circuit produces transmit square waves, this square wave produces the driving signal that can drive IGBT device break-make by the drive circuit of high-power break-make device IGBT, at this, drive under signal function, IGBT device is realized break-make, thereby in the major loop of IGBT, form the break-make of large electric current, high-power transmitting, this high-power signal loads and transmitting coil.The transient electromagnetic field that disconnects its generation of moment at large electric current, the receiving coil in the measured circuit of this transient electromagnetic field receives, and forms measuring-signal, gets the maximum of this measuring-signal as measurement result.By changing in major loop, be added in the DC voltage on coil, the maximum of measuring-signal, sets up the functional relation of this maximum and add transient voltage, and its range of linearity is effective excitation area of probe, the magnetic saturation region of nonlinear area for popping one's head in.This relation has reflected magnetic material initial magnetization curve variation characteristic.Transmit square waves frequency is lower, and scope is between (0.01～1000) Hz.And adjustable in interval, adopt forward direction transmission, and the magnitude of voltage of transmit square waves increases progressively, test process does not make magnetic material generation remanent magnetism.
The high-power break-make device IGBT turn-off time t of described transient electromagnetic well-logging probe detection system
of<0.09mS.Guarantee when signal is launched with square wave to produce less distortion, make actual loaded very little in rising edge and the trailing edge waveform slope of transmitting coil two ends excitation waveform.
The magnitude of voltage of finally measuring by record is observed the initial magnetization curve variation characteristic of magnetic material.
Technical scheme of the present invention is based on following correlation technique Research foundation.
In nonferromagnetic material, in linear relation between magnetic flux density B and magnetic field intensity H, the slope of straight line just equals μ
0, between the B of magnetic material and H, be curved line relation.A not yet magnetized magnetic material is magnetized, and when magnetic field intensity H increases gradually by zero, magnetic flux density B will increase thereupon, and curve B=f (H) is just called magnetization curve.As shown in Figure 1.Magnetization curve can be divided into four sections substantially: while starting to magnetize, external magnetic field a little less than.Magnetic flux density increases unhappyly, as shown in Oa section in Fig. 1; Along with the enhancing of external magnetic field, a large amount of magnetic domains of material internal start to turn to, and trend towards outer magnetic field direction, and now B value increases very soon, as shown in ab section; If external magnetic field continues to increase, most of magnetic domain has tended to outer magnetic field direction, and the magnetic domain that can turn to is fewer and feweri, and B value increases more and more slower, and as shown in bc section, this phenomenon is called saturated.After reaching capacity, magnetization curve becomes the B=μ with nonmagnetic substance substantially
0h(Fig. 1 dotted line) straight line that characteristic parallels, as shown in cd section.
In probe, be wound with transmitting coil and receiving coil, for the present invention, at transmitting coil, carry out signal transmitting, measure the magnitude of voltage of receiving coil.The output voltage values at receiving coil two ends becomes corresponding relation with magnetic induction intensity, in the no longer linear increase of saturation region magnitude of voltage.Transmiting signal source adopts the forward square-wave pulse periodically repeating, and tranmitting frequency is lower, and adjustable.In electromagnetic probe, be wound with transmitting coil and receiving coil, by changing the different transmitting of square wave rectangular pulse DC voltage value, from little, become gradually large, the trend increasing progressively, load on transmitting coil, access the resistance of suitable resistance at receiving coil output, test coil receives direct electromotive force. u
0, draw transmitting electromotive force and the relation curve that receives electromotive force, find the magnetic saturation district of electromagnetic probe.In order to reduce the impact of remanent magnetism, test process does not apply opposing magnetic field, i.e. transmitted waveform does not adopt the waveform pulse of negative direction, transmit square waves magnitude of voltage be all on the occasion of, with in actual instrumentation work engineering, launch bipolarity square waveform (comprise direct impulse, comprise again negative-going pulse) difference.
Transient electromagnetic log measurement, as a brand-new oil reservoir logging measuring method, is applicable to open hole well and cased hole logging field.For this reason, transient electromagnetic well logging has very large technical advantage.Although it belongs to electromagnetic induction phenomenon in essence, excitaton source adopts transient state mode of excitation, and excitation waveform adopts multiple periodic bipolar pulse sequence, as square wave, half-sine wave, trapezoidal wave etc., tranmitting frequency is very low, and scope is between (0.01～1000) Hz.Bipolar pulse sequence had both comprised transmitting direct impulse, comprised again transmitting negative-going pulse, and this mode can reach the direct current offset that suppresses in detection signal and the object of noise, thereby improved the signal to noise ratio of detection signal.
Transient electromagnetic well logging, according to electromagnetic induction principle, realizes the measurement to formation resistivity beyond well by the secondary field of measuring in transient electromagnetic field, lower to the requirement of well.In measuring-signal, the Amplitude Ratio of useful signal is lower, and signal to noise ratio is very low, in order to guarantee certainty of measurement, need to carry out high-power TEM transmitting, and the approach that realizes high-power transmitting is to adopt the magnetic core that magnetic conductivity is high to make transmitting coil.Magnetic core has non-linear and magnetic saturation problem, and the quality and performance of probe directly affects measurement result, must systematically detect it.
For the detection of probe coil, while take, humorous field transmits as single sine wave, to same magnetic material, select the parameters such as different tranmitting frequencies, magnetic field intensity to magnetize, can obtain a series of magnetization curves that vary in size, relevant theoretical foundation is very perfect, and method of testing is ripe.And take transient electromagnetic principle as basic logger tranmitting frequency lower, coil testing process is mainly considered the distortion situation of emitting voltage and size of current, polarity of transmission and the waveform that transmits, circuit is realized all unified bridge-types that adopts and is connected, from time humorous be that basic instrument detection method is different.
The invention has the beneficial effects as follows: realized the measurement of transient electromagnetic well-logging probe parameter, linearity and the magnetic saturation region of probe have been obtained, can carry out efficiency evaluation to the high-power feature that excites of probe, for designing supporting high-power energizing circuit, provide design parameters.
Accompanying drawing explanation
Fig. 1 is the magnetic induction intensity of institute of the present invention foundation and the graph of a relation of magnetic field intensity;
Fig. 2 is the principle schematic of test process of the present invention;
Fig. 3 is the structure composition frame chart of test macro of the present invention;
In figure: 1, control circuit, 2, the drive circuit of high-power break-make device IGBT, 3, high-power break-make device IGBT, 4, probe to be measured, 5, measuring circuit, 6, high-power DC power supply.
Fig. 4 is transmit square waves control principle block diagram of the present invention;
Fig. 5 is that the present invention launches electromotive force and receives electro-motive force measurement result figure.
The specific embodiment:
Participate in Fig. 2, probe comprises transmitting coil and receiving coil, and the two has different winding number of turn N
1, N
2.Transmitting coil is applied to transmitting rectangle square-wave pulse sequence, and transmitting rectangle square-wave pulse adopts forward direction transmission, and magnitude of voltage is u.Formulate measuring process, initial step is that transmitting DC voltage value is little, and test coil receives DC voltage value u
0.Later step, magnitude of voltage becomes large gradually from little, the trend increasing progressively, while guaranteeing next step, emitting voltage value is higher than the magnitude of voltage of previous step transmitting, and this load mode object is that test process does not make magnetic material generation remanent magnetism.Transmitted pulse loads on after transmitting coil, tests the magnitude of voltage u of receiving coil
0, get the maximum of this measuring-signal as measurement result.In each measuring process process, measure the duration on result without impact, i.e. test process launch pulse sequence N(1,2,3,4,5...) can extend to infinite manyly,, in each measuring process process, the magnitude of voltage of launch pulse sequence equates.Until next step in the time of need to increasing exomonental magnitude of voltage, then is launched.
Referring to Fig. 3, a kind of transient electromagnetic well-logging probe measuring system, control circuit 1, high-power radiating circuit and measuring circuit 5, consist of, high-power radiating circuit comprises the drive circuit 2 of high-power DC power supply 6, high-power break-make device IGBT 3 and high-power break-make device IGBT; High-power DC power supply 6, high-power break-make device IGBT 3 and probe to be measured 4 form major loop, and high-power break-make device IGBT 3 is connected 1 by the drive circuit 2 of high-power break-make device IGBT with control circuit.The 1 generation cycle of control circuit, long square wave was given high-power radiating circuit, it is the drive circuit 2 that square wave that control circuit 1 produces is controlled high-power break-make device IGBT, generation can drive the driving signal of high-power break-make device IGBT 3 break-makes, at this, drive under signal function, high-power break-make device IGBT 3 realizes break-make, like this, the unexpected interruption that produces large electric current in the major loop that high-power DC power supply 6 and probe to be measured 4 form, in probe 4 to be measured, produce transient electromagnetic field, receiving coil in the measured circuit 5 of this transient electromagnetic field receives, form measuring-signal, get the maximum of this measuring-signal as measurement result.Change in major loop and be added in the DC voltage on coil, the maximum of measuring-signal, the function of setting up between DC voltage and the maximum of measurement contacts, and this function neutral line is partly the range of linearity of coil, and entering nonlinear flex point is the starting point in the magnetic saturation region of coil.By measuring the range of linearity and the magnetic saturation region that can obtain measured probe.
In Fig. 3, describe the drive circuit 2 of high-power break-make device IGBT and the switch element in high-power break-make device IGBT 3 composition diagrams 4, four switch elements (1,2,3,4) structure is identical.Be used for launching rectangular pulse waveform, because do not need to launch reverse impulse, during signal transmitting, circuit only needs two switch element work.Mode 1: choice for use switch element 1 and switch element 4; Mode 2: or choice for use switch element 2 and switch element 3.One of them combination in these two kinds of combinations can.After switch element is opened, dc source loads on transmitting coil.Switch element has extremely short turn-off time (t
of<0.09mS), guarantee when signal is launched with square wave to produce less distortion, make actual loaded very little in rising edge and the trailing edge waveform slope of transmitting coil two ends excitation waveform.Transmit square waves frequency is lower, measuring process 0.01<f<1000Hz, and adjustable in this is interval, adopt forward direction transmission.
Fig. 5 is that a coil-induced electromotive force maximum value of column type is with the actual measured results of added DC voltage change relation, as we can see from the figure: at institute's making alive, be less than in the interval of 5V, induced electromotive force maximum value is linear with the variation of added DC voltage.After voltage is higher than 5V, the induced electromotive force maximum value measuring, not on straight line, enters its magnetic saturation state.
Claims (3)
1. a transient electromagnetic well-logging probe detection system, comprise control circuit (1), the drive circuit (2) of high-power break-make device IGBT, high-power break-make device IGBT(3), probe to be measured (4) measuring circuit (5) and high-power DC power supply (6), it is characterized in that: high-power DC power supply (6), high-power break-make device IGBT (3) and probe to be measured (4) form major loop, high-power break-make device IGBT(3) drive circuit (2) by high-power break-make device IGBT is connected with control circuit (1), probe to be measured is provided with transmitting coil in (4), measuring circuit is provided with receiving coil in (5).
2. a kind of transient electromagnetic well-logging probe detection system according to claim 1, it is characterized in that: control circuit (1) produces transmit square waves, this transmit square waves frequency range, between 0.01～1000Hz, adopt forward direction transmission, and the magnitude of voltage of transmit square waves increases progressively.
3. a kind of transient electromagnetic well-logging probe detection system according to claim 1 and 2, is characterized in that: high-power break-make device IGBT (3) turn-off time t
of<0.09mS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310511241.8A CN103590825A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic well-logging probe detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310511241.8A CN103590825A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic well-logging probe detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103590825A true CN103590825A (en) | 2014-02-19 |
Family
ID=50081121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310511241.8A Pending CN103590825A (en) | 2013-10-26 | 2013-10-26 | Transient electromagnetic well-logging probe detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103590825A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908000A (en) * | 2019-11-07 | 2020-03-24 | 吉林大学 | Tunnel transient electromagnetic data interpretation method based on variable dimension Bayes |
| CN112731539A (en) * | 2020-12-15 | 2021-04-30 | 中国科学技术大学 | Zero-magnetic-flux multi-coil receiving transient electromagnetic method detection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060038570A1 (en) * | 2002-12-10 | 2006-02-23 | Constable Steven C | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields |
| CN101581214A (en) * | 2009-03-23 | 2009-11-18 | 西安石油大学 | Transient electromagnetic logging device in through-casing well |
| CN102505935A (en) * | 2011-10-20 | 2012-06-20 | 中国石油天然气集团公司 | Excitation circuit of transducer array of three-dimensional acoustic wave downhole instrument |
| CN103352690A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Transient electromagnetic logging transmitting probe |
| CN103362497A (en) * | 2013-07-11 | 2013-10-23 | 天津大学 | Sleeve pipe joint hoop measuring system based on high-power ultrasonic probe and match inductance |
| CN203640729U (en) * | 2013-10-26 | 2014-06-11 | 中国石油化工集团公司 | Transient electromagnetic well-logging probe detection system |
-
2013
- 2013-10-26 CN CN201310511241.8A patent/CN103590825A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060038570A1 (en) * | 2002-12-10 | 2006-02-23 | Constable Steven C | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields |
| CN101581214A (en) * | 2009-03-23 | 2009-11-18 | 西安石油大学 | Transient electromagnetic logging device in through-casing well |
| CN102505935A (en) * | 2011-10-20 | 2012-06-20 | 中国石油天然气集团公司 | Excitation circuit of transducer array of three-dimensional acoustic wave downhole instrument |
| CN103352690A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Transient electromagnetic logging transmitting probe |
| CN103362497A (en) * | 2013-07-11 | 2013-10-23 | 天津大学 | Sleeve pipe joint hoop measuring system based on high-power ultrasonic probe and match inductance |
| CN203640729U (en) * | 2013-10-26 | 2014-06-11 | 中国石油化工集团公司 | Transient electromagnetic well-logging probe detection system |
Non-Patent Citations (1)
| Title |
|---|
| 宋汐瑾: "生产井瞬变电磁探测理论与方法研究", 《中国博士学位论文全文数据库基础科学辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908000A (en) * | 2019-11-07 | 2020-03-24 | 吉林大学 | Tunnel transient electromagnetic data interpretation method based on variable dimension Bayes |
| CN112731539A (en) * | 2020-12-15 | 2021-04-30 | 中国科学技术大学 | Zero-magnetic-flux multi-coil receiving transient electromagnetic method detection device |
| CN112731539B (en) * | 2020-12-15 | 2022-05-13 | 中国科学技术大学 | Zero-magnetic-flux multi-coil receiving transient electromagnetic method detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106321086A (en) | Transient measurement method for barefoot well formation resistivity | |
| CN110196276B (en) | Ferromagnetic material large-range damage low-frequency electromagnetic detection method based on broadband excitation | |
| CN103149272A (en) | Sub-saturated time-division and multi-frequency magnetic flux leakage testing method | |
| US9880130B2 (en) | Pulsed eddy current testing with dual-purpose coils | |
| CN103424472B (en) | A kind of shear wave pick-up unit based on magnetic striction wave guide and detection method | |
| CN103837606B (en) | The method that the electromagnet ultrasonic changer of polyphase structure and ultrasonic high-efficiency excite | |
| CN101393173B (en) | Staying cable anchorage zone magnetostriction wave guide detection system | |
| CN109283399B (en) | Method for measuring loss of high-frequency magnetic element winding | |
| CN104374468A (en) | Intrinsic frequency measuring method for long and thin object | |
| CN103954684A (en) | Method for nondestructive testing by use of change rate of magnetic flux leakage | |
| CN103590809A (en) | Transient electromagnetic well logging excitation method | |
| CN108802203B (en) | rod-shaped member internal defect positioning method based on multi-mode technology | |
| CN103590825A (en) | Transient electromagnetic well-logging probe detection system | |
| CN203640729U (en) | Transient electromagnetic well-logging probe detection system | |
| CN104060986A (en) | Multi-frequency array electrical logging resonant launching system | |
| Wang et al. | Multiwaveform current transmitter for induced polarization effects surveying based on the SQUID-TEM system | |
| CN111796331B (en) | Ground magnetic resonance detection device and method for shallow groundwater and hydrocarbon substances | |
| CN2708312Y (en) | Oil pipe low-frequency eddy current casing damage detecting instrument | |
| Tong et al. | Formation of random dark envelope solitons from incoherent waves | |
| CN102401895B (en) | High-power sound wave transmitting device for depth measuring instrument | |
| CN102928503A (en) | Electromagnetic acoustic emission nondestructive inspection device for metal plate | |
| CN208383813U (en) | It is a kind of for excite pipeline torsion guided wave electromagnet ultrasonic changer | |
| CN103675724B (en) | A kind of device utilizing electric field to improve giant magnetic impedance sensor magnetic hysteresis and ameliorative way thereof | |
| CN103616441A (en) | Electromagnetic ultrasonic signal excitation device applied to ferromagnetic material | |
| Bing | Application of electromagnetic acoustic in steel pipe inspection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140219 |
|
| RJ01 | Rejection of invention patent application after publication |