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DLDT Litho Density Logging Tool

The litho density logging tool can calculate the formation density and under the wireline mode, the cartridge controls the arm of hydraulic activation sub and collects the caliper data; under the memory mode，the cartridge collects decentralizer caliper data.
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DDLT Dual Lateral Logging Tool

It can provide two resistivity measurements of the flushed zone and the original formation resistivity, and to study the variation of formation resistivity.
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DDST High Defination Sonic Logging Tool

The high-resolution sonic logging Sonde adopts a single-transmitter and five-receiver sonic system, it can provide the formation sound velocity curve and obtain the formation porosity;
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DHAD Hydraulic Activation Back-up

The Hydraulic Activation Back-up is only used in wireline mode, to push the lithology density sonde and the compensated neutron sonde tightly against the hole, so that the tool can correctly measure the formation specifications .And also it provides one caliper curve.
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