Geophysical Borehole Logging Tools Well Logging System Wireline Logging Instrument Downhole Logging Tool For Water Well And Mineral Borehole Logging
Description
The Natural Gamma & Electrical Resistivity Probe measures natural gamma,16" Normal & 64"Normal Resistivity,Spontaneous Potential (SP),Single Point Resistance(SPR),Temperature. Users can log resistivity profiles with different depths of investigation and gain information about permeability, porosity, water quality and geological formation properties.
Operating Conditions:Uncased;Borehole Fluid:Water or Mud.
Parameter
| 1. Instrument Power Supply:DC200V±20%,Electricity≤40mA |
| 2. Electrode Array: AM 16";AM 64" |
| 3. Natural Gamma Sensor:NaI Crystal |
| 4. Temperature Sensor::Platinum Resistance (pt100) |
| 5. Measuring Range: |
| resistivity:1~4000Ωm(customize10000Ωm) |
| Spontaneous Potential (SP):±1200mV |
| Natural Gamma:0~32768cps |
| Temperature Range: 0ºC~100ºC, Resolution:0.025ºC |
| 6. Measurement Accuracy:2%(10~4000Ωm)or ±1Ωm |
| 7. Environmental: Temperature<=80ºC;Pressure≤20MPa |
| 8. Signal: Bipolar Codes |
SP logging:
In the case of no power supply to the well, it can be observed that there is a potential difference between the electrode in the well and the ground, which is called the spontaneous potential difference. Self potential logging is a method of observing spontaneous potential in a well and studying geological section of borehole according to spontaneous potential curve.
The measurement technology of SP logging is the simplest among all logging methods. One electrode m is put into the well and the other electrode n is grounded on the ground. In the absence of any artificial electric field, the potential difference between m electrode and N electrode can be measured by the instrument for measuring the potential difference between m electrode and N electrode.
Since the potential of N electrode fixed on the ground is a fixed value, when m electrode moves in the well, the variation of potential difference between M and N measured, i.e. spontaneous potential curve, reflects the change of a certain potential value along the well bore.
Gamma logging is a method of measuring the natural gamma ray intensity of rock strata along a well. Rocks generally contain varying amounts of radioactive elements and emit radiation constantly. In igneous rocks, for example, the more acidic they are, the more radioactive they are. The more mud there is in a sedimentary rock, the more radioactive it is. Using these rules, according to gamma rays
It is possible to classify the geological section of the borehole, determine the content of sandstone mud in the sand and mudstone section and qualitatively judge the permeability of the strata. One immediate use of gamma logging is to find radioactive minerals (uranium, thorium, etc.), as well as radioactive minerals such as potash salts
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