SU631851A1 - Induction well-logging apparatus - Google Patents
Induction well-logging apparatusInfo
- Publication number
- SU631851A1 SU631851A1 SU772454830A SU2454830A SU631851A1 SU 631851 A1 SU631851 A1 SU 631851A1 SU 772454830 A SU772454830 A SU 772454830A SU 2454830 A SU2454830 A SU 2454830A SU 631851 A1 SU631851 A1 SU 631851A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- logging apparatus
- induction well
- phase
- induction
- phase shift
- Prior art date
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
ii
Изобретение относитс к нефтепромысловой геофизике и может бьпь использовано цл измерени кажущейс электрической проводимости пород при геофизических исследовани х скважин.The invention relates to oilfield geophysics and can be used to measure the apparent electrical conductivity of rocks during well logging.
Известны устройства дл индукционног каротажа, в которых дл исключени ошибки, возникающей в тракте усилени из-за сдвига фазы, примен етс фазова калибровка усилител JlJ . Эти устройства недостаточно точны. Паразитный фазовый сдвиг может произойти в процессе измерений после калибровки в результате , например, изменений условий эксплуатации.Induction logging devices are known in which phase calibration of an amplifier JlJ is used to eliminate errors that occur in the amplification path due to phase shift. These devices are not accurate enough. A parasitic phase shift can occur during measurements after calibration as a result of, for example, changes in operating conditions.
Наиболее близким по технической сущности к предложенному вл етс устрой ство дл индукционного каротажа скважин , содержащее зондовую часть с генераторными и прйемньми катушками и электронную часть, включающую высокочастотный генератор, избирательный усилитель сигнала приемных катушек , фазочувствительный детектор и частотно-импульсный модул тор.The closest in technical essence to the proposed invention is a device for induction well logging, comprising a probe part with generating and direct coils and an electronic part including a high-frequency generator, a selective signal amplifier of the receiving coils, a phase-sensitive detector and a pulse-frequency modulator.
Это устройство также не обеспечивает достаточной точности. Усилитель сигнала наведенной в приемных катушках ЭДС создает сдвиг по фазе выходного сигнала по отношению к входному, который неThis device also does not provide sufficient accuracy. The signal amplifier of the EMF induced in the receiving coils creates a phase shift of the output signal with respect to the input signal, which is not
вл етс посто нным, а измен етс в зависимости от условий внешней среды, времени, изменени частоты генератора и т.п. Следующий за усилителем фазочув- ствительный детектор выдел ет сигнал,is constant, and varies depending on environmental conditions, time, changes in the frequency of the generator, etc. The phase-sensitive detector following the amplifier emits a signal
совпадающий по фазе с опорным. В св зи с этим паразитный сдвиг по фазе выходного сигнала, неизбежно происход щий в устройстве, приводит к существенной погрешности измерени ,coincident in phase with the reference. In this connection, the parasitic phase shift of the output signal, which inevitably occurs in the device, leads to a significant measurement error,
Цель изобретени - повышение точности измерени .The purpose of the invention is to improve the measurement accuracy.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU772454830A SU631851A1 (en) | 1977-02-22 | 1977-02-22 | Induction well-logging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU772454830A SU631851A1 (en) | 1977-02-22 | 1977-02-22 | Induction well-logging apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU631851A1 true SU631851A1 (en) | 1978-11-05 |
Family
ID=20696414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU772454830A SU631851A1 (en) | 1977-02-22 | 1977-02-22 | Induction well-logging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU631851A1 (en) |
-
1977
- 1977-02-22 SU SU772454830A patent/SU631851A1/en active
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