CN1916360A - Logging method and logging instrument of natural potential in high resolution - Google Patents
Logging method and logging instrument of natural potential in high resolution Download PDFInfo
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- CN1916360A CN1916360A CN 200610152725 CN200610152725A CN1916360A CN 1916360 A CN1916360 A CN 1916360A CN 200610152725 CN200610152725 CN 200610152725 CN 200610152725 A CN200610152725 A CN 200610152725A CN 1916360 A CN1916360 A CN 1916360A
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Abstract
The present invention relates to a high-resolution natural potential well-logging method and specially-designed logging instrument for implementing said method. It is characterized by that said instrument shell interior includes a 31-core connector and a collection circuit and control circuit board, can said instrument shell exterior is connected with an electrode system which uses rubber as carrier and contains 16 mutually-insulated electrodes. Besides, said invention also provides the well-logging method by using said logging instrument and its concrete logging steps.
Description
Technical field:
Employed a kind of method and for implementing the custom-designed logger of this method when the present invention relates to the oil field and carrying out logging operation especially relates to a kind of nutural potential logging method and logger with high-resolution.
Background technology:
Nutural potential logging is to be used for one of logging method of formation evaluation the earliest, is still so far and divides lithology, estimates the reservoir, determines the important means of formation water salinity, be the completion well logging must survey project.In the Process of Oil Well Drilling, the mud of use is generally water-base mud, because formation water resistivity is different with drilling mud resistivity, causes the suction-operated to ion of ions diffusion effect and rock particles, produces the diffusion adsorption potential.Experiment shows that the diffusion adsorption potential coefficient of pure shale is 59mv, and the diffusion adsorption potential coefficient on clean sandstone stratum is-11.6mv.Therefore according to spontaneous potential curve, can judge lithology and calculate formation water salinity.Conventional nutural potential logging method adopts ground electrodes as the reference electrode, utilizes the mobile continuously measurement electrode in recorder record down-hole with respect to the potential change between the ground reference electrode, thereby obtains spontaneous potential curve.The shortcoming that adopts this method to obtain spontaneous potential curve is: this measuring method is owing to adopt ground electrodes as the reference electrode, inevitably to be subjected to the interference of well site electric field and the interference of cable transmission, signal to noise ratio is reduced, thereby cause the resolution ratio of oil sheet is reduced; In addition.Owing to adopt ground as the reference electrode, therefore current potential will be subjected to the influence of contiguous country rock through forming the loop between country rock and complicated stratum and the ground electrodes, and signal amplitude is reduced.
Summary of the invention:
For solve conventional nutural potential logging method adopt ground electrodes as the reference electrode cause that resolution ratio is low, signal amplitude be subjected to shoulder effect big, measure problems such as being subject to the well site interference of electromagnetic field, the invention provides a kind of natural potential in high resolution logging method and for implementing the custom-designed a kind of logger of this method, after this method is implemented, have resolution ratio height, signal amplitude stable, measure characteristics such as not being subject to the well site interference of electromagnetic field.
Technical scheme of the present invention is: the logging method of this kind natural potential in high resolution, its key step is that the nearest mud stone of chosen distance stratum point to be measured is as the reference electrode, measure stratum to be measured and put the potential difference between the reference electrode therewith, this potential difference noted be uploaded to ground log data recorder, obtain spontaneous potential curve.
The nearest mud stone of chosen distance stratum point to be measured how need be by means of custom-designed logger, and this logger comprises tool housing, instrument skeleton, tail cap and power transformer.The core of this instrument is as follows: include one 31 core joint, Acquisition Circuit and control circuit board in described tool housing, connecting one outside tool housing is electrode system and the head harness that carrier is inlaid with 16 electrodes with rubber.Comprise multi-strobe circuit, comparison circuit, analog to digital conversion circuit, data upload circuit, single-chip microcomputer acquisition control circuit, reset circuit of SCM on described Acquisition Circuit and the control circuit board.Described electrode system is called as electrode N15～N1, M from top to bottom respectively, wherein electrode M is a measurement electrode, electrode N1～N15 is a reference electrode, and mutually insulated between each electrode links to each other by the multiple signals input in the multi-strobe circuit in 31 core joints and the tool housing respectively.Wherein the crystal oscillator in the single-chip microcomputer acquisition control circuit provides clock pulses to single-chip microcomputer, the single-chip microcomputer acquisition control circuit sends gating signal to multi-strobe circuit, the reference electrode of multi-strobe circuit after with gating is connected into an input of comparison circuit, and coconnected measurement electrode M carries out variate with another input.The potential difference signal of comparison circuit output thus, enter analog to digital conversion circuit, under the control of single-chip microcomputer acquisition control circuit, after analog to digital conversion circuit is finished data transaction, by single-chip microcomputer acquisition control circuit image data, and put into the single-chip microcomputer internal data memory, send gating signal then and select next passage.Single-chip microcomputer arrives host computer by the data upload circuit with transfer of data, and the power supply supply lines links to each other with head harness by 31 core joints with connection, is connected on the ground instrument by cable again.
The present invention has following beneficial effect: because after taking such scheme, cancelled the ground reference electrode, all electrode system is placed on the down-hole, therefore antijamming capability is strong, measured value is stable, spontaneous potential curve in that the amplitude on the thin layer records under the conventional method more approaches the static spontaneous potential (SSP) value than ordinary curve.Confirm to adopt log resolution ratio height after this kind method by experiment, longitudinal frame can reach 0.2 meter, and coincide fine with lithological profile.
Description of drawings:
Fig. 1 is the structural representation of natural potential in high resolution logger related among the present invention.
Fig. 2 is the electrical schematic diagram of natural potential in high resolution logger related among the present invention.
Fig. 3 is the software flow pattern of single-chip microcomputer in the natural potential in high resolution logger related among the present invention.
Fig. 4 uses natural potential in high resolution curve and the lithological profile comparison diagram that obtains after the method for the invention.
Fig. 5 uses natural potential in high resolution curve and the conventional spontaneous potential curve comparison diagram that obtains after the method for the invention.
1-31 core joint among the figure, 2-power transformer, 3-Acquisition Circuit and control circuit board, 4-instrument skeleton, the 5-tool housing, 6-tail cap, 7-head harness, the S1-multi-strobe circuit, the S2-comparison circuit, S3-analog to digital conversion circuit, S4-data upload circuit, S5-single-chip microcomputer acquisition control circuit, the S6-reset circuit of SCM.
The specific embodiment:
The invention will be further described below in conjunction with accompanying drawing:
Why method described in the present invention has practicality is based on breadboard result of core analysis.The natural potential on argillaceous sandstone stratum mainly is the diffusion adsorption potential, and the diffusion adsorption potential coefficient of pure shale is 59mv, and the diffusion adsorption potential coefficient on clean sandstone stratum is-11.6mv, because measurement electrode M and the electrode N that drops on mudstone stratum
iBetween potential difference necessarily minimum, therefore select N
iBe reference electrode, measure M, N
iBetween potential difference, just can obtain the natural potential value on stratum.
Constructed a kind of natural potential in high resolution logging method described in the present invention thus, promptly utilize the nearest mud stone of a kind of logger chosen distance stratum point to be measured as the reference electrode, measure stratum to be measured and put the potential difference between the reference electrode therewith, this potential difference noted be uploaded to ground log data recorder, carry this instrument along pit shaft on slowly, can record the natural potential value of Different Strata, finally obtain a complete spontaneous potential curve.
Fig. 1 is the structural representation of this natural potential in high resolution logger, and its major part is apparatus measures part and electrode system part.The structure of electrode system part is on the rubber carrier of an insulation, inlays 16 electrodes, is respectively N15～N1, M from top to bottom, and M is a measurement electrode, and N1～N15 is a reference electrode.Electrode M, N
1～N
15Mutually insulated between each electrode.Apparatus measures partly comprises tool housing 5, instrument skeleton 4, tail cap 6 and power transformer 2; Include one 31 core joint, Acquisition Circuit and control circuit board 3 in tool housing 5, apparatus measures part upper end links to each other with electrode system by 31 core joints.Comprise multi-strobe circuit S1, comparison circuit S2, analog to digital conversion circuit S3, data upload circuit S4, single-chip microcomputer acquisition control circuit S5, reset circuit of SCM S6 on described Acquisition Circuit and the control circuit board 3, its electrical schematic diagram as shown in Figure 2.Wherein the crystal oscillator among the single-chip microcomputer acquisition control circuit S5 provides clock pulses to single-chip microcomputer, single-chip microcomputer acquisition control circuit S5 sends gating signal to multi-strobe circuit S1, the reference electrode of multi-strobe circuit S1 after with gating is connected into the input of comparison circuit S2, and coconnected measurement electrode M carries out variate with another input.The potential difference signal of comparison circuit S2 output thus, enter analog to digital conversion circuit S3, under the control of single-chip microcomputer acquisition control circuit S5, after analog to digital conversion circuit S3 finishes data transaction, by single-chip microcomputer acquisition control circuit S5 image data, and put into the single-chip microcomputer internal data memory, send gating signal then and select next passage.Single-chip microcomputer arrives host computer by data upload circuit S4 with transfer of data, and the power supply supply lines links to each other with head harness by 31 core joints with connection, is connected on the ground instrument by cable again.
Fig. 3 is the software flow pattern of single-chip microcomputer in the natural potential in high resolution logger related among the present invention, and the course of work is: single-chip microcomputer is initialization system at first, and V is set
MN=0, i=15 is set selects electrode N exactly
15, measurement electrode M and N
15Potential difference V
MN15, judge V
MN15Whether less than V
MN, if just use V
MN15Value replace V
MNValue, and the measurement that begins to measure No. 14 electrodes; If not, just directly begin next electrode measurement.By that analogy, each electrode all will compare, and this is after measuring whole electrodes, V at this moment
MNValue be exactly minimum current potential difference, with writing data into memory, this value is exactly the natural potential value of our the best relatively mud stone reference point of electrode M point measured.
The concrete course of work is as follows after using the present invention:
Logger is transferred to the pit shaft that is full of water-base mud by the well logging armored cable, after instrument is transferred to and measured target zone, supplies to exchange the 180v alternating current by cable to instrument, and the process rectifying and wave-filtering obtains the operating voltage of appliance requires, and instrument is started working.
At first, after system powered on, crystal oscillator Y1 provided clock pulses to single-chip microcomputer, and the watchdog circuit of being made up of MAX813 sends reset signal to single-chip microcomputer 89C51, after single-chip microcomputer resets, to system initialization, and enters the control gatherer process.At first single-chip microcomputer selects a switch ADG406 to send gating signal to 16, and gating passage 15 makes the N of passage 15
15Electrode is connected into an input of the differential amplifier of being made up of ICL7560, carries out variate with the M electrode of another input, obtains the potential difference V between 2
MN15, enter the analog to digital conversion circuit of forming by AD574, under the control of single-chip microcomputer, after analog to digital conversion circuit is finished data transaction,, and put into internal data memory by the single-chip microcomputer image data.Send gating signal selector channel 14 then, measure potential difference V equally
MN14, with V
MN15Compare, select the potential difference minimal data to deposit internal data memory in, the rest may be inferred, after the total data measurement is finished, by relatively having obtained the minimum V of this survey mark
MniValue, this value is exactly the natural potential value of this survey mark.Single-chip microcomputer arrives host computer by serial communication interface MAX485 with transfer of data, finished the measurement of this point, moving up along pit shaft then begins to descend the measurement of a bit, and when passing through different stratum, the one-chip computer in the logger is controlled multidiameter option switch equally.
Fig. 4 uses natural potential in high resolution curve and the lithological profile comparison diagram that obtains after the method for the invention.By contrasting with the lithological profile data, the resolution ratio of curve reaches 0.2 meter, for 0.1 meter stratum demonstration is arranged, and this helps dividing segmentation in thin layer, thin interbed and the layer after showing application the present invention.What Fig. 4 showed in addition is the well-log information of a bite well, this interval lithology complexity, and porosity difference, thin interbed is grown, the stratum heterogeneous body; Most rock cores are argillaceous siltstoue and calcic siltstone, and conventional spontaneous potential curve can't be differentiated the variation on stratum, and the curve that obvious the present invention obtains after using has reflected the variation on stratum relatively truly, coincide fine with lithological profile.
Fig. 5 uses natural potential in high resolution curve and the conventional spontaneous potential curve comparison diagram that obtains after the method for the invention, and the natural potential in high resolution curve is called the GSP curve.The GSP curve is consistent with conventional spontaneous potential curve in the amplitude of thick-layer, and the amplitude on thin layer is apparently higher than conventional spontaneous potential curve, and it is little that this explanation GSP curve is influenced by the cofferdam, and amplitude is true, more approaches the static spontaneous potential (SSP) value than ordinary curve.After using this method, changed conventional self-potential survey method and adopted the mode of ground as the reference electrode, whole electrode systems are placed on the down-hole, not being vulnerable to well site electromagnetic interference and cable transmission when therefore logging well disturbs, make instrument have stronger antijamming capability, resulting measured value is stable.Can prove that from above data the effect of natural potential well logging instrument device of high-resolution described in the present invention and method has been realized purpose of the present invention significantly better than conventional nutural potential logging method.
Claims (3)
1, a kind of natural potential in high resolution logger, comprise tool housing (5), instrument skeleton (4), tail cap (6) and power transformer (2), it is characterized in that: include one 31 core joint, Acquisition Circuit and control circuit board in described tool housing (5), connecting one outside tool housing (5) is electrode system and the head harness that carrier is inlaid with 16 electrodes with rubber;
Comprise multi-strobe circuit (S1), comparison circuit (S2), analog to digital conversion circuit (S3), data upload circuit (S4), single-chip microcomputer acquisition control circuit (S5), reset circuit of SCM (S6) on described Acquisition Circuit and the control circuit board;
Described electrode system is respectively electrode N15～N1, M from top to bottom, wherein electrode M is a measurement electrode, electrode N1～N15 is a reference electrode, mutually insulated between each electrode, and the multiple signals input that passes through respectively in the multi-strobe circuit (S1) in 31 core joints and the tool housing links to each other;
Wherein the crystal oscillator in the single-chip microcomputer acquisition control circuit (S5) provides clock pulses to single-chip microcomputer, single-chip microcomputer acquisition control circuit (S5) sends gating signal to multi-strobe circuit (S1), multi-strobe circuit (S1) is connected into the reference electrode behind the gating one input of comparison circuit (S2), coconnected measurement electrode M carries out variate with another input, the potential difference signal of comparison circuit (S2) output thus, enter analog to digital conversion circuit (S3), under the control of single-chip microcomputer acquisition control circuit (S5), after analog to digital conversion circuit (S3) is finished data transaction, by single-chip microcomputer acquisition control circuit (S5) image data, and put into the single-chip microcomputer internal data memory, send gating signal then and select next passage, single-chip microcomputer arrives host computer by data upload circuit (S4) with transfer of data, the power supply supply lines links to each other with head harness by 31 core joints with connection, is connected on the ground instrument by cable again.
2, a kind of natural potential in high resolution logging method, it is characterized in that: use the nearest mud stone of natural potential in high resolution logger chosen distance stratum point to be measured described in the claim 1 as the reference electrode, measure stratum to be measured and put the potential difference between the reference electrode therewith, this potential difference noted be uploaded to ground log data recorder, obtain spontaneous potential curve.
3, according to the logging method of natural potential in high resolution described in the claim 2, it is characterized in that: the multidiameter option switch in the Single-chip Controlling multi-strobe circuit (S1) in this logger in the single-chip microcomputer acquisition control circuit (S5), measurement electrode M and electrode N successively
1～N
15Between potential difference, by relatively selecting the electrode of potential difference minimum, this moment reference electrode N
iThe position promptly be best mud stone reference point, measure also record M and N
iBetween potential difference, this potential difference is exactly the natural potential on stratum, electrode M point place, and this natural potential in high resolution logger is moved up along pit shaft, measures the natural potential value of Different Strata while moving, and obtains a complete spontaneous potential curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101527258A CN100489267C (en) | 2006-09-26 | 2006-09-26 | Logging instrument of natural potential in high resolution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101527258A CN100489267C (en) | 2006-09-26 | 2006-09-26 | Logging instrument of natural potential in high resolution |
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| Publication Number | Publication Date |
|---|---|
| CN1916360A true CN1916360A (en) | 2007-02-21 |
| CN100489267C CN100489267C (en) | 2009-05-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892838A (en) * | 2010-06-22 | 2010-11-24 | 中国石油天然气股份有限公司 | Method and device for acquiring high-resolution logging curve |
| CN102768369A (en) * | 2012-06-05 | 2012-11-07 | 武汉长盛煤安科技有限公司 | Roadway drivage drilling induced polarization advance water probing forecasting method, device and probe |
| CN102767365A (en) * | 2012-07-05 | 2012-11-07 | 中国电子科技集团公司第二十二研究所 | High-resolution direction resistivity dual lateral logging tool and resistivity measuring method |
-
2006
- 2006-09-26 CN CNB2006101527258A patent/CN100489267C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892838A (en) * | 2010-06-22 | 2010-11-24 | 中国石油天然气股份有限公司 | Method and device for acquiring high-resolution logging curve |
| CN101892838B (en) * | 2010-06-22 | 2013-03-20 | 中国石油天然气股份有限公司 | Method and device for acquiring high-resolution logging curve |
| CN102768369A (en) * | 2012-06-05 | 2012-11-07 | 武汉长盛煤安科技有限公司 | Roadway drivage drilling induced polarization advance water probing forecasting method, device and probe |
| CN102767365A (en) * | 2012-07-05 | 2012-11-07 | 中国电子科技集团公司第二十二研究所 | High-resolution direction resistivity dual lateral logging tool and resistivity measuring method |
| CN102767365B (en) * | 2012-07-05 | 2015-03-25 | 中国电子科技集团公司第二十二研究所 | High-resolution direction resistivity dual lateral logging tool and resistivity measuring method |
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| Publication number | Publication date |
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| CN100489267C (en) | 2009-05-20 |
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