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DD4BG Four Arm independent Caliper Logging Tool

The Four Arm independent Caliper is only used in wireline mode.It can measured four independent caliper value.
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DLL8 Eight Laterolog Logging Tool

The Eight Laterolog Logging Tool is used to measure the resistivity of the invaded zone. The Sonde is designed with an SP ring, and can also perform natural potential measurement in wireline mode.
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DYDJ Rigid Briddle

The function is to increase the distance of eight laterolog main current return and increase the distance between the deep laterolog current return point and the voltage return point.
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DFJT Flexible Joint

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