By using the radial series connection, DLLT provides two resistivity measurements. These two measurements have different depth of investigation into the formation. Two different frequencies are used to enable the simultaneous measurements. Using the resistivity of different depth to calculate water saturation of formation and distinguish oil-water.

Specification:

Max. Temperature:175℃,4h Max. Pressure:140Mpa

Outer Diameter:Mandrel:92mm/3.62 inche ,Electronics:89mm/3.5inches；

Make-up Length:4132mm/162.68inches Weight:110kg

Measuring Range:0.2-40000Ω∙m

Measuring Accuracy(to infinite, non-invadedformation): 0.2～1Ω∙m±20%

1～2000Ω∙m±5%

2000～5000Ω∙m±10%

5000～40000Ω∙m±20%

Vertical Resolution: 600mm/23.62 inches

Depth of Investigation: shallow:800mm/31.5 inches,deep:2700mm/106.3inches Operating V&I:180Vac±10V,50～60Hz,≈60mAac

Logging Speed:no more than1800m/h

Make-up Length:4118mm/162.13inches Reliability:logging success rate is no less than 95%

Vibration:Tool can work normally after 50km traveling under 40km/h on tertiary highway.

Shock:2g

Instrument material : Precipitation-hardening stainless steel and

Glasssteel HT Repeat relative error : <=10%