CN2055181U - Acoustic amplitude logging instrument - Google Patents
Acoustic amplitude logging instrument Download PDFInfo
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- CN2055181U CN2055181U CN89214438U CN89214438U CN2055181U CN 2055181 U CN2055181 U CN 2055181U CN 89214438 U CN89214438 U CN 89214438U CN 89214438 U CN89214438 U CN 89214438U CN 2055181 U CN2055181 U CN 2055181U
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- China
- Prior art keywords
- acoustic amplitude
- resistance
- amplitude log
- log tools
- positive
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Abstract
The utility model relates to an improved acoustic amplitude logging instrument for inspecting cementing quality for petroleum, geology, etc. As a logging down instrument is provided with the power amplification circuit of straight coupling complete complementary output OTL and an emitting balancing resistor R-[p], and a ground instrument is provided with the band pass filter of 20KHz, a positive peak detector, etc., for measuring dynamic ranges, decreasing baseline interference, the sensitivity and the accuracy of the complete machine, and other aspects, the acoustic amplitude logging instrument are totally superior to the existing acoustic amplitude logging instruments. The acoustic amplitude logging instrument is designed for mid-deep well conditions; the temperature resistance of the utility model is 155 DEG C, and the pressurization is 100MPa.
Description
The utility model releases a kind of oil, geology etc. of being applicable to and checks the acoustic amplitude logger device of cementing qualities, and more precisely, it is a kind of acoustic amplitude log tools that improved.
The quality of cementing quality, directly influence formation testing, oil recovery and the water filling work of oil well, in production practices, often run into because acoustic amplitude logging unreliable, cause the false judgment on the cementing quality, its result will cause blindly squeeze method or in the well completion work of scurrying under the groove situation, waste a large amount of manpower and materials, and have endless trouble.Therefore, the reliability of raising acoustic amplitude logging is main to closing.
As everyone knows, the basic principle of acoustic amplitude logging is to measure on cement and the sleeve pipe cement plane, the attenuation change situation of the first peak-to-peak amplitude of acoustic signals, when cementing, the first peak-to-peak amplitude of the acoustic signals that is measured is little, during weak bonding, first peak-to-peak amplitude is big, judges the bonding quality of cement and sleeve pipe with this.But the factor that influences the first peak-to-peak amplitude of acoustic signals is a lot: the existence of microgap will make the first peak-to-peak amplitude that measures increase; Downhole cartridge departs from borehole axis will make the first peak-to-peak amplitude that measures reduce; Normal base line disturbs the first peak-to-peak amplitude that measures will be increased; Negative baseline interference will make the first peak-to-peak amplitude that measures reduce; The power of the measurement dynamic size of instrument itself, the height of measuring sensitivity, inhibition interference performance all can cause the inaccurate of measurement result.
The main reference prior art is as follows:
1. " improve the criterion of cementing quality inspection work ", the BF Mcgee, HL microcaloire, Ou Yangchangsheng are translated " logging technique " 1982,2.
2. " discussion of the test of Acoustic amplitude logging influence factor and acoustic amplitude logging scale ", North China oil well logging company " logging technique " 1981,10.
3. " simulated test of the scales influence factor of sound width of cloth standard of instrumentsization and simulation well ", well logging group of grand celebration probing company " logging technique " 1981.10.
4. the GJ75 type middle-deep well cement bond logging instrument produced of Xi-an Petroleum Prospecting Instrument Gen. Factory.
In order further to satisfy on-the-spot well logging actual needs, improve and use acoustic amplitude logging to solve the problem that cementing quality exists at present, must be improved existing instrument, mainly be measurement dynamic range, reduction baseline interference, raising instrumental sensitivity and the precision that enlarges instrument, these are the purpose of this utility model and task.
Task of the present utility model is finished like this:
One. enlarge measurement dynamic range, the sensitivity of raising apparatus measures of downhole cartridge amplifying circuit: with reference to Fig. 1, in the acoustic amplitude logging, when cement and sleeve pipe cement fully, the amplitude at the first peak of casing wave is approximately about 10mv, when cement and sleeve pipe not glued fully (being so-called empty sleeve pipe), be approximately about 600mv, therefore, this just requires the downhole cartridge amplifying circuit that enough big dynamic range must be arranged, promptly undistorted when peak signal (not intact glued), can discern minimum signal (glued fully) again reliably.For this reason, the downhole cartridge amplifying circuit is selected the full complementary output OTL power amplifier that always is coupled, its power output stage V for use
4, V
5Adopt the wide warm area transistor of novel NPN and PNP complementary pairing, symmetry is good, all is better than general circuit, the input stage V of this amplifying circuit at non-linear distortion, instant response and temperature performance etc.
1, V
2Also adopt the transistor of different conduction polarity respectively, in order to improve the stability of this amplifying circuit, V
1Emitter resistance R
5Receive power output stage V
4And V
5Mid point, form strong interpolar negative feedback network, resistance R is set in the circuit
4And R
9Be in order to make power output stage V
4And V
5Keep mid-point voltage also its static working current to be adjusted, all enough big multiplication factor, resistance R can be arranged when making whole amplifying circuit operate in supply voltage positive direct-current 60V~100V
3And R
5Ratio (R
3/ R
5) determined the gain of circuit.
Two. reduce baseline interference, improve and believe/make an uproar ratio, increase the small-signal detecting reliability, measure has two:
One is with reference to Fig. 2, for making baseline straightening, in the downhole cartridge radiating circuit, at emission transformer T
FThe secondary in parallel one adjustable balance resistance R that
P, its resistance is generally 〉=470K Ω, and it can be a potentiometer, also can be two series resistances, if the former, the necessary ground connection of center head, if the latter, must ground connection between two resistance.This be because: the factor that produces baseline interference is a lot, but mainly is that the high-voltage pulse that radiating circuit produced causes eddy current and because the interference that the asymmetric grade of lead-in wire is caused at downhole probe center tap place.Fig. 3 has provided verification tube signal, and Fig. 4 is the balancing resistance R
PBefore baseline be 〉=| 150|mv, Fig. 5 are the balancing resistance R
PBack baseline≤| 10|mv.
Its two, with reference to Fig. 6, as mentioned above, baseline interference is mainly come the spontaneous emission synchronous interference, though bigger improvement has been arranged because of having added above-mentioned measure, eliminate synchronously and other noise jamming for basic, be provided with one by operational amplifier N at ground instrument measuring circuit inlet
1The low reactance-resistance ratio bandpass filter that constitutes, its centre frequency is 20KHZ ± 2KHZ, and useful 20KHZ is passed through, and the clutter of 20HZ synchronous interference and other frequency is filtered, and makes the baseline of ripple survey signal very straight to the greatest extent, has improved the letter/ratio of making an uproar, in order to make this circuit filtering stable performance, R in the circuit
13, R
14, R
15, R
16, R
17All select the RJ-0.5W high temperature resistance for use.Fig. 7 be baseline before the bandpass filtering≤| 10|mv, Fig. 8 are that baseline value is bordering on desirable zero base line behind the bandpass filtering.Above-mentioned wave filter can be calculated as follows:
Centre frequency f
0=√ 2/RC,
Quality factor q=√ 2/(5-K), K=1+R wherein
4/ R
5,
Multiplication factor K
0=K/(5-K).
Three. improve the range of linearity and the certainty of measurement of ground instrument measuring circuit: with reference to Fig. 9, the range of linearity of measuring circuit and certainty of measurement, final decision the sensitivity and the precision of complete machine, the utility model has been selected the AC-DC translation circuit of a positive peak wave detector as B point signal, N for use
2Be phase comparator together, N
3Be a follower, the two passes through resistance R
FHave strong feedback, circuit is stable, and operating principle is as follows:
1. as input signal V
1Be timing, comparator N
2Just be output as, and through just meeting diode V
7Give capacitor C
1Charging is because of resistance R
18Numerical value is enough big, capacitor C
1Discharge be very slowly.
2.N
3Be a follower, capacitor C
1On voltage by follower N
3Through resistance R
FFeed back to comparator N
2End of oppisite phase, as the comparative voltage of in-phase end, when feedback voltage (is C
1On voltage) during less than the input voltage of in-phase end, input signal will continue to give capacitor C
1Charging is up to comparator N
2When the feedback voltage of end of oppisite phase equates in the input voltage of in-phase end, comparator N
2Be output as zero, detector diode V
7Biasing, charging stops, at this moment capacitor C
1On charging voltage reached the peak value of positive input signal.
3. as input signal V
1During decline, comparator N
2Output end voltage be lower than capacitor C
1On voltage, detector diode V
7Continue biasing, therefore, capacitor C
1On voltage be not subjected to the influence of input signal, just through resistance R
18Slowly discharge (voltage maintenance).
4. diode V
6To detector diode V
7PN junction carried out voltage-drop compensation, to improve the sensitivity of small-signal, detector diode V
7Guarantee that the positive signal peak value is to capacitor C
1Charging, negative peak is inoperative, so, when next positive peak signal arrives, will repeat said process, thus the time showed the AC-DC conversion.
5. experiment showed, comparator N
2With follower N
3Adopt operational amplifier μ A741, but preferably select the operational amplifier F3140 of high speed high resistant for use.
Technology described in the utility model is used in the GJ85 type middle-deep well acoustic amplitude log tools that Xi-an Petroleum Prospecting Instrument Gen. Factory is about to go into operation.
Figure 13 is the downhole cartridge circuit diagram, wherein launches balance resistance R
PAdopt high temperature resistant potentiometer, its value is 470K Ω, V
8Select GK5A/185 ℃ of high temperature controllable silicon for use, transmitting probe BCT selects 12 high temperature crystal of niobium lithium for use, the emission resistance R
0Be reduced to 330 Ω (three RJ-2W-1K parallel connections) by former 1K Ω, improve the temperature performance of radiating circuit.V
1~V
5Form acoustic signals and receive amplifying circuit, V
1, V
5--3CA1KW, V
2, V
3, V
4--3DA1KW, C
2, C
3, C
6--CA5/S-125V high temperature tantalum electrolytic capacitor, C
1, C
4--high temperature is washed the human relations capacitor, and receiving transducer BCR selects 8 high temperature crystal of niobium lithium for use.
Figure 14 is ground instrument measuring circuit figure, wherein by operational amplifier N
2The bandpass filter of being formed, N
2--the μ A741 operational amplifier of industrial general, for guaranteeing the stable of centre frequency, R
13~R
17All select RJ for use
2-0.5W high temperature resistance, R
13-100K Ω, R
14-100K Ω, R
15-100K Ω, R
16-13K Ω, R
17-36K Ω, capacitor C
7, C
8Select the CYZ mica condenser for use, C
7-100P, C
8-100P.D
1Be storbing gate, select CD4066 four bidirectional analog switches for use, its input is A point waveform, and is shown in Figure 10, and output is B point waveform, and is shown in Figure 12, and Figure 11 illustrates the gate-control signal of control storbing gate.
Among Figure 14 by operational amplifier N
2And N
3The positive peak wave detector of forming of B point signal being done the AC-DC conversion, N
2, N
3Select F3140 for use, R
18-15 Ω, V
6, V
7Select 1N914 for use, R
F-100K Ω, C
1-0.1 μ f, R
19-2M.
GJ85 middle-deep well acoustic amplitude log tools described in the utility model compare with domestic like product, have the following advantages:
1. downhole cartridge amplifying circuit dynamic range is big, and is highly sensitive: power supply 60~100V direct current, and 15~30 times of multiplication factors, input signal 5~2000mv all can linearly amplify.
2. the downhole cartridge temperature performance is good, working stability: temperature is elevated to 155 ℃ from room temperature, and constant temperature one hour, output linearity is changed to≤and ± 50 ‰.
3. baseline interference is little, believes/makes an uproar than height: during input 1000mv, baseline is done
Disturb≤± 10mv, direct current is output as zero μ A.
4. ground instrument measuring circuit precision height, it is little to be overlapped the peak operating influence: the range of linearity
100~1000mv, error≤± 20 ‰.
Claims (13)
1, a kind of acoustic amplitude log tools is characterized in that: the downhole cartridge amplifying circuit is by transistor V
1~V
5Form the full complementary output OTL power amplifier of straight coupling and constitute, its supply voltage is 60 volts to 100 volts of positive direct-current.
2, according to claim 1 described acoustic amplitude log tools, it is characterized in that: power output stage V
4, V
5Adopt NPN and the wide warm area transistor of positive-negative-positive complementary pairing.
3, acoustic amplitude log tools according to claim 1 is characterized in that: the input stage V of power amplifier
1And V
2Adopt the transistor of different conduction polarity, i.e. V
1Be positive-negative-positive, V
2Be the NPN type.
4, according to claim 2 or 3 described acoustic amplitude log tools, it is characterized in that: V
1Emitter resistance R
5Receive power output stage V
4And V
5Mid point, form strong interpolar direct current negative feedback network.
5, acoustic amplitude log tools according to claim 1 and 2 is characterized in that: change regulating resistor R
4Resistance, make power output stage V
4And V
5Keep mid-point voltage, resistance R
9Setting, make the power output stage V when different supply voltages (60V~100V)
4And V
5Static working current adjusted.
6, acoustic amplitude log tools described in the utility model, its spy is: in the downhole cartridge radiating circuit, emission transformer T
FA secondary balance resistance R in parallel
P, its resistance is 〉=470K Ω.
7, acoustic amplitude log tools described in the utility model is characterized in that: ground survey instrument circuit inlet adds one by operational amplifier N
1The low reactance-resistance ratio bandpass filter that constitutes, its centre frequency is 20KHZ ± 2KHZ.
8, acoustic amplitude log tools according to claim 7 is characterized in that: resistance R
19, R
14, R
15, R
16, R
17All adopt the RJ-0.5W high temperature resistance.
9, acoustic amplitude log tools according to claim 7 is characterized in that: operational amplifier N
1That adopt is μ A741, and that best is F3140.
10, acoustic amplitude log tools described in the utility model is characterized in that: in the instrument measuring circuit of ground, what B point signal was done the AC-DC conversion is by phase comparator N together
2With a follower N
3By feedback resistance R
1The positive peak wave detector of forming with strong feedback.
11, acoustic amplitude log tools according to claim 10 is characterized in that: with phase comparator N
2Output rectify and to meet a detector diode V
7Guarantee that positive peak is to C
1Charging.
12, according to claim 10 or 11 described acoustic amplitude log tools, it is characterized in that: with phase comparator N
2Output and inverting input between a diode V in parallel
6, as to detector diode V
7The PN junction voltage-drop compensation.
13, according to claim 10 or 11 described acoustic amplitude log tools, it is characterized in that: resistance R
18Resistance be 10~20 Ω.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN89214438U CN2055181U (en) | 1989-07-17 | 1989-07-17 | Acoustic amplitude logging instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN89214438U CN2055181U (en) | 1989-07-17 | 1989-07-17 | Acoustic amplitude logging instrument |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2055181U true CN2055181U (en) | 1990-03-28 |
Family
ID=4870227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN89214438U Withdrawn CN2055181U (en) | 1989-07-17 | 1989-07-17 | Acoustic amplitude logging instrument |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2055181U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1863986B (en) * | 2003-08-08 | 2010-11-03 | 普拉德研究及开发股份有限公司 | Multimode acoustic imaging in cased wells |
-
1989
- 1989-07-17 CN CN89214438U patent/CN2055181U/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1863986B (en) * | 2003-08-08 | 2010-11-03 | 普拉德研究及开发股份有限公司 | Multimode acoustic imaging in cased wells |
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