Purpose:

    This instrument is suitable to be used in geophysical well logging, such as coalfield, metal, drilling and etc. It records the curves of different parameters. It consists of recorder, power supply, measuring range controller, depth indicator, regulator power, pulley of pithead and etc.

 Main Technical Specifications:

    1. Basic recording error: ±1%

    2. Effective recording width: 140mm

    3. Time of the whole course: ＜1s

    4. Power: 220V±10% 50Hz±5% AC  12V DC

    5. Power consuming: 40W approx. (manual logging winch)  450W (motor logging winch)

    6. Dimension: 390×265×190mm³

 Purpose:

   This instrument makes use of a probe composed of sodium iodide crystal and photo-electric multiplier to convert gamma ray into electrical quantity to be measured. It is used to measure the gamma ray strength of the rocks in the boreholes of coal, metallic minerals in the course of geophysical prospecting so as to determine the properties of the rocks and thereby find out the quantities of the radioactive elements in order to carry out the quantitative analysis of the minerals.

    When the instrument is provided with the radioactive source and lead screen chamber, the strength of artificial radioactivity of the rocks can be measured (gamma-gamma or neutron-gamma), thereby density of the rocks or porosity can be indirectly calculated out.

    The instrument should be operated in conjunction with Model JBC-2 Automatic Well Logging Instrument or Model JDC-1, JDC-2 Electronic Automatic Well Logging Instruments.

    All the measured parameters can be automatically displayed by the recorder.

strong>Technical Specifications:

  1. Measuring Ranges:

         Range 1: 0～30000 pulses/min

         Range 2: 0～60000 pulses/min

         Range 3: 0～120000 pulses/min

         Range 4: 0～240000 pulses/min

         Nonlinearity error of each range 10%.

  2. Time constants:

         Four steps: 0.5 sec., 1.5 sec., 3 sec., 6 sec.

  3. Standard frequencies of the frequency calibrator:

         Calibrating frequency I : 10000 pulses/min.±5%

         Calibrating frequency II : 60000 pulses/min. ±5%

  4. The instrument can be used for natural gamma and artificial gamma measurements.

     It’s provided with 4 sections of lead chamber, each of 10cm in length. The distance   of the source can be adjusted within 20～50cm.

  5. It can be operated at temperature of -5℃～50℃ and relative humidity of 95%. Under the extreme conditions, the relative error of the average reading values in comparison with those under normal weather conditions should be greater than ±10%.

  6. The instrument is shockproof. It can work under the vibration of frequency of 120 times/min., acceleration of 3g. The relative error should not be greater than ±10%.

  7. The down hole probe is hermetic. It can withstand a pressure of 200Kg/cm2 without leak. The max-depth of borehole is 1000M.

  8. Power supply: 220V 50Hz AC

     As surface console and down hole probe are provided with low-voltage stabilizers, no voltage adjustment is necessary. Total consumption is ≯50mA.

  9. Instrument is compact and portable.

         Overall dimensions for surface console: 225×150×128mm

         Overall dimensions for down hole probe: Φ54×1240

         Total weight: 19 kg

 Purpose:

    The instrument is one kind of the well logging instrument of resistively method using collecting electrodes. Its features are: strong capability of differentiating layers, little influence on adjacent layers. Clear response of curves change in the mud well of high degree of mineralization and of high resistance thin layers. Under the condition for shallow immersion, when the thickness of the rock layer is greater than the length of the electrode system, the measure apparent resistively of the rock layer is near the real resistively Rt. If micro-lateral logging is further taken, the real resistively of the surface can be determined

    The instrument can be used in well logging for the exploration of coal, metallic minerals and underground water.

Technical Specifications:

  1.Measuring range of RO ( main electrode connects to ground resistance)

        step1    10Ω～1KΩ

        step2    1KΩ～5KΩ

        step3    100Ω～10KΩ

  2.Non-linearity: 10%(RP =5Ω～20Ω, RO starts from 30Ω)

  3.Range of selected frequency of surface console:  380Hz～420Hz

        Center frequency: 400Hz approx.

  4.Down hole main current IO: 0.08～0.12mA selectable.

  5.Stability of down hole main current IO:

        When RO =100Ω～10KΩ., RP=2Ω～20Ω

       The change of RO / RP ≯2000, the stability ≯10%

  6.Downhole max. output ≮0.4w (RP=1.5, Vmax.≮0.8V)

  7.Downhole osc. Frequency: 400Hz±20Hz

        Square wave (400 Hz is the frequency at 20℃  )

  8.Working conditions:

        Surface console: Working temperature; -10℃  ～ +45℃

                                          Relative humidity: ≯  90%

        Down hole probe: Working temperature: 0℃  ～ +45℃

        Allowable working pressure: 200kg/cm²

  9.Instrument overall dimensions and weight:

       (1). Surface console:

             Overall dimensions: 370×280×120 mm

             Weight: 5kg approx

       (2) Down hole probe:

             Overall dimensions: 140×2600mm (can be dismantle into two sections)

                                                     50×2600mm (ditto)

              Weight: 15kg approx

 Purpose:

    Brush electrodes are used in well logging for exploration of coal and metallic mineral in order to determine the thickness and structure of their formation

  Technical Specifications:

  1. Electrode Insulation

          (1) dry condition: 100MΩ

          (2) wet condition: 2MΩ

  2. Overall dimensions of Brush Plate:

          (1) outside diameter: 72mm.for borehole of 48～65mm.diameter

          (2) outside diameter: 125mm.for borehole of diameter greater than 90mm.

Purpose:  

    JJY-2 Caliper is an instrument specially used to measure the average diameter of well bore. It's four measuring legs closely cling to borehole wall when they are being lifted, as if there are two rules measuring two diameters that are perpendicular to each other. It records depth curve of bore diameter through sensor which changes into electric signal and the signal is sent to the ground instrument by cable. It's widely used in measuring of pore-creating for well drilling and hole filling piles.

The hole diameter curve can be measured as follows:

  1. Determine how much cement is needed when the well is cemented and properly choose the fixed position for annular tube.

  2. Provide necessary information n hole diameter for later well log interpretation and radioactive well log interpretation.

  3. Interpreter collapse of position of a pore well.

  4. Provide information on analysis when quality of pile foundation is examined or measured.

Main technical index:

  1. Scope of measurement: Ф500mm～Ф1200mm ,fixing leg(200mm):Ф1600mm

  2. Measuring  error: ±15mm

  3. Pressure resistance: 15MPa

  4. Instrument with down hole parted leg fittings

Purpose:  

    JJY-5 Caliper is an instrument specially used to measure the average diameter of well bore. It's four measuring legs closely cling to borehole wall when they are being lifted, as if there are two rules measuring two diameters that are perpendicular to each other. It records depth curve of bore diameter through sensor which changes into electric signal and the signal is sent to the ground instrument by cable. It's widely used in measuring of pore-creating for well drilling and hole filling piles.

The hole diameter curve can be measured as follows:

  1. Determine how much cement is needed when the well is cemented and properly choose the fixed position for annular tube.

  2. Provide necessary information n hole diameter for later well log interpretation and radioactive well log interpretation.

  3. Interpreter collapse of position of a pore well.

  4. Provide information on analysis when quality of pile foundation is examined or measured.

Main technical index:

  1. Scope of measurement: Ф600mm～Ф1800mm ,fixing leg(770mm): Ф2800mm

  2. Measuring  error: ±25mm

  3. Pressure resistance: 20MPa

  4. Instrument with down hole parted leg fittings