CN104912546A - Induced polarization potential continuous well logging method - Google Patents
Induced polarization potential continuous well logging method Download PDFInfo
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- CN104912546A CN104912546A CN201410086132.0A CN201410086132A CN104912546A CN 104912546 A CN104912546 A CN 104912546A CN 201410086132 A CN201410086132 A CN 201410086132A CN 104912546 A CN104912546 A CN 104912546A
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Abstract
The invention discloses an induced polarization potential continuous well logging method, which is realized on the basis of an induced polarization potential well logging instrument through the design of an instrument electrode system array and the time sequence design of instrument emission and measurement. The electrode system array at least comprises three groups of electrodes, and the lengths of electrodes in each group are identical, wherein the electrodes in the first group are emitting electrodes; and the electrodes in the last group are receiving electrodes; the electrodes in the middle group or the middle groups comprise both emitting electrodes and receiving electrodes. For the time sequence of the instrument emission and measurement, a time sequence signal generated through an electronic circuit is employed firstly to supply electricity to the emitting electrodes; then, the emitting electrodes stop emission, and the receiving electrodes perform measurement, wherein the measurement time and the emission time are identical; the polarization of a double-electrode-length well section is completed in the emission time; and the measurement on the well section stratum with the same length is completed in the measurement time. The induced polarization potential continuous well logging method has the advantage that the continuous polarization and continuous measurement of the induced polarization potential well logging instrument on the stratum in the continuous moving process in a borehole is realized.
Description
Technical field:
To the present invention relates in logging technique field a kind of there is continuous moving in the wellbore while complete the induced polarization current potential continuous logging method of formation continuous measurement.
Prior art:
One-point measurement can only be carried out during current induced polarization potential logging, measuring apparatus is parked in measured point, this survey mark is polarized and measures its potential decay spectrum decayed in time or instantaneous polarization potential, and then instrument is moved to next survey mark, continue the measurement of next survey mark.This measuring method, formation can only carry out discrete point survey, can not realize instrument continuous moving, continuous measurement in the wellbore.Its shortcoming is clearly: one, logging efficiency is low, and each survey mark will waste the plenty of time; Two, during site operation, survey mark is difficult to select accurately; Three, because survey mark is discrete, all standing of well interval of interest can not be realized and measure, miss out formation information useful in a large number; When four, measuring, instrument must hover in the wellbore and wait for the regular hour, easily causes the engineering accidents such as cable absorption, adds the risk of construction.
Summary of the invention:
This invention main purpose be for current induced polarization potential logging instrument can not in the wellbore continuous moving while the formation difficult problem that polarizes continuously and measure, a kind of special scheme by electrode system array and transmitting, Survey control sequential is proposed, reach this instrument and in the wellbore while continuous moving, the induced polarization current potential continuous logging method of the continuous measurement of formation can be realized.
Technical scheme of the present invention:
A kind of induced polarization current potential continuous logging method is based on induced polarization potential logging instrument, and the timing Design launched by the design of this electrode apparatus system array and instrument, measured is realized.Described electrode system array at least comprises three groups of electrodes, and the length often organizing electrode is identical and be L, and wherein first group of electrode is emission electrode, and last group electrode is collecting electrode, and middle one group or several groups of electrodes not only comprise emission electrode but also comprise collecting electrode.Described induced polarization potential logging instrument is launched, the sequential measured is that the clock signal produced by electronic circuit controls first to power to emission electrode, launch a chronomere t, and ensure that the degree of depth of electrode system movement in chronomere t is equal with the length L of one group of electrode, namely logging speed is L/t, then emission electrode stops launching, collecting electrode is measured, Measuring Time unit is all t mutually with the chronomere of transmitting, be 2L by the distance of the time instrument movement of 2t, the polarization of 2L length well section is completed in first time t, and the measurement completed in second time t this 2L length well section stratum, like this based on induced polarization potential logging instrument continuous moving incessantly in well, constantly repeat this process, just achieve the continuous measurement of formation.
Such scheme further:
Described electrode system array is A, B, C, D tetra-groups of electrodes, and wherein A group is emission electrode, B and C group electrode not only comprises emission electrode but also comprise collecting electrode, and D group electrode is collecting electrode.
Described electrode system array middle groups electrode adopts electrode to be emission electrode and collecting electrode, or adopts each electrode to be divided into two sub-electrodes to be respectively used to transmitting and receiving.
The sequential working pattern that described instrument is launched, measure comprises automatic mode and fixed mode.
Described automatic mode is based on logging speed, namely depth system every 0.01-0.5 rice in ground sends a pulse signal to downhole instrument, downhole electronics counts this pulse signal, when counting reaches n, instrument has completed the polarization to 2L length well section stratum, and electronic circuit produces control signal and stops launching and start to measure, counter O reset is laid equal stress on New count, when measurement count reaches n, measuring process completes, and then enters next circulation.
Described fixed mode is that polarizing with measurement time t is master, can be met the needs of Different Strata polarization time t by adjustment logging speed.
Invention effect:
This invention achieves formation continuous polarization, continuous measurement in the process of induced polarization potential logging instrument continuous moving in well.Especially by change mode of operation, can control to launch and measurement time t, the measurement needs on different polarization characteristic stratum can be met.
Accompanying drawing explanation
Fig. 1 is method for continuous measuring implementation procedure schematic diagram;
Fig. 2 is electrode system array junctions composition;
Fig. 3 is System's composition functional block diagram;
Fig. 4 is DATA REASONING electrod-array and tested stratum and data corresponding relation figure;
In figure: 1-A group electrode, 2-B group electrode, 3-C group electrode, 4-D group electrode, 5-electronic circuit, 6-ground system, 7-launches, Survey control tfi module, 8-transmitter module, 9-measurement module.
Detailed description of the invention:
Below in conjunction with accompanying drawing, by exemplary embodiments, the present invention will be further described.
This embodiment is based on induced polarization potential logging instrument, and the timing Design launched by the design of electrode system array and instrument, measured is realized.
As shown in Figure 1, electrode system Array Design is A, B, C, D tetra-groups of electrodes, the length often organizing electrode is identical is L, the quantity often organizing electrode specifically can be determined according to the otherwise needs of instrument, wherein A group is emission electrode, B and C group electrode is emission electrode and collecting electrode (also this each electrode of two groups can be divided into two sub-electrodes to be respectively used to transmitting and receiving), and D group electrode is only used for receiving.The clock signal produced by electronic circuit during measurement controls first to A, B, C tri-groups of electrode power supplies, launch a chronomere t, and ensure the degree of depth of electrode system movement in time t equal with the length L of one group of electrode (logging speed is L/t), then by A, B, C power-off, stop launching, measurement time t is carried out by B, C, D tri-groups of electrodes, the distance of the time instrument movement of such 2t is 2L, complete the polarization of 2L length well section in first time t, and in second time t, complete the measurement to this 2L length well section stratum.This sampling instrument continuous moving incessantly in well, constantly repeats this process, just achieves the continuous measurement of formation.
The Control timing sequence that this instrument is launched, measure is completed jointly by electronic circuit and ground system.Because different wells, the polarization characteristic of formation rocks different in even same well is different, and the polarization time of needs is also not exclusively the same, so we can adjust polarization time and measurement time t according to actual needs during practical logging.Instrument is once design typification, and electrode system array length is fixing, if now change time t, just necessarily requires logging speed to match with it.In order to realize this coupling, devise multiple-working mode, during well logging, execute-in-place engineer can assign instruction by software on ground as required and makes it be operated in corresponding pattern to downhole instrument, meets the needs of well logging.Mode of operation mainly divides two classes: automatic mode and fixed mode.During automatic mode, every 0.1 meter of ground depth system sends a pulse signal to downhole instrument, downhole electronics counts this pulse signal, when counting reaches n, instrument has completed the polarization to 2L length well section stratum, and electronic circuit produces control signal and stops launching and start to measure, counter O reset is laid equal stress on New count, when counting reaches n, measuring process completes, and then enters next circulation.This pattern is based on logging speed, realizes polarization and Measuring Time and logging speed match by Instrument Design.
And fixed mode design philosophy just in time conversely, to polarize and measurement time t, once selected a kind of fixed mode, logging speed and this pattern match must be regulated to log well.During fixed mode well logging, do not count the pulse signal that ground depth system comes, downhole instrument makes it be operated in steady job pattern according to the instruction that software on ground is assigned, and simultaneous logging speed will adjust to the speed with this patterns match.Different patterns has different polarization measurement time parameter, can meet the needs of Different Strata polarization time t.
Claims (6)
1. an induced polarization current potential continuous logging method, based on induced polarization potential logging instrument, the timing Design launched by the design of this electrode apparatus system array and instrument, measured is realized, it is characterized in that: described electrode system array at least comprises three groups of electrodes, the length often organizing electrode is identical and be L, wherein first group of electrode is emission electrode, and last group electrode is collecting electrode, and middle one group or several groups of electrodes not only comprise emission electrode but also comprise collecting electrode, described induced polarization potential logging instrument is launched, the sequential measured is that the clock signal produced by electronic circuit controls first to power to emission electrode, launch a chronomere t, and ensure that the degree of depth of electrode system movement in chronomere t is equal with the length L of one group of electrode, namely logging speed is L/t, then emission electrode stops launching, collecting electrode is measured, Measuring Time unit is all t mutually with the chronomere of transmitting, be 2L by the distance of the time instrument movement of 2t, the polarization of 2L length well section is completed in first time t, and the measurement completed in second time t this 2L length well section stratum, like this based on induced polarization potential logging instrument continuous moving incessantly in well, constantly repeat this process, just achieve the continuous measurement of formation.
2. induced polarization current potential continuous logging method according to claim 1, it is characterized in that: described electrode system array is A, B, C, D tetra-groups of electrodes, wherein A group is emission electrode, B and C group electrode not only comprises emission electrode but also comprise collecting electrode, and D group electrode is collecting electrode.
3. induced polarization current potential continuous logging method according to claim 1 and 2, it is characterized in that: described electrode system array middle groups electrode adopts electrode to be emission electrode and collecting electrode, or adopt each electrode to be divided into two sub-electrodes to be respectively used to transmitting and receiving.
4. induced polarization current potential continuous logging method according to claim 1 and 2, is characterized in that: described instrument is launched, the sequential working pattern of measurement comprises automatic mode and fixed mode.
5. induced polarization current potential continuous logging method according to claim 4, it is characterized in that: described automatic mode is based on logging speed, namely depth system every 0.01-0.5 rice in ground sends a pulse signal to downhole instrument, downhole electronics counts this pulse signal, when counting reaches n, instrument has completed the polarization to 2L length well section stratum, electronic circuit produces control signal and stops launching and start to measure, counter O reset is laid equal stress on New count, when measurement count reaches n, measuring process completes, and then enters next circulation.
6. induced polarization current potential continuous logging method according to claim 4, is characterized in that: described fixed mode is that polarizing with measurement time t is master, can be met the needs of Different Strata polarization time t by adjustment logging speed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089192A (en) * | 2016-06-14 | 2016-11-09 | 王伟男 | A kind of with boring induced polarization log instrument, system and method |
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| CN1460190A (en) * | 2000-11-16 | 2003-12-03 | 施蓝姆伯格海外股份有限公司 | Sonic logging tool including receiver and spacer structure |
| CN101592029A (en) * | 2009-07-02 | 2009-12-02 | 大庆油田有限责任公司 | A kind of method for well logging with induced polarization spectrum |
| US20100020638A1 (en) * | 2008-07-24 | 2010-01-28 | Precision Energy Services, Inc. | Monopole acoustic transmitter ring comprising piezoelectric material |
| CN101737037A (en) * | 2008-11-25 | 2010-06-16 | 中国石油天然气集团公司 | Synthetic focusing method capable of inducing polarization well logging |
| CN102817608A (en) * | 2012-08-18 | 2012-12-12 | 中国石油化工股份有限公司 | Array type electrode system for induced polarization potential logging instrument |
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2014
- 2014-03-11 CN CN201410086132.0A patent/CN104912546A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460190A (en) * | 2000-11-16 | 2003-12-03 | 施蓝姆伯格海外股份有限公司 | Sonic logging tool including receiver and spacer structure |
| US20100020638A1 (en) * | 2008-07-24 | 2010-01-28 | Precision Energy Services, Inc. | Monopole acoustic transmitter ring comprising piezoelectric material |
| CN101737037A (en) * | 2008-11-25 | 2010-06-16 | 中国石油天然气集团公司 | Synthetic focusing method capable of inducing polarization well logging |
| CN101592029A (en) * | 2009-07-02 | 2009-12-02 | 大庆油田有限责任公司 | A kind of method for well logging with induced polarization spectrum |
| CN102817608A (en) * | 2012-08-18 | 2012-12-12 | 中国石油化工股份有限公司 | Array type electrode system for induced polarization potential logging instrument |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089192A (en) * | 2016-06-14 | 2016-11-09 | 王伟男 | A kind of with boring induced polarization log instrument, system and method |
| CN106089192B (en) * | 2016-06-14 | 2019-04-05 | 王伟男 | One kind is with brill induced polarization log instrument, system and method |
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Application publication date: 20150916 |