| 摘要 |
In a formation tester constructed with an extendable probe driven by hydraulic means, the means being connected to a hydraulic circuit, an improved apparatus is set forth which includes a hydraulic fluid multiplier means. This multiplier means is connected between the pump and the means extending the probe and backup shoes. The multiplier means incorporates a step piston and a large cylinder having a step conforming with the piston. Suitable seals are placed on the piston. The piston drives initially to deliver a high volume low pressure flow to extend rapidly the probe, and completes its operation with a low volume high pressure flow to assure proper setting. This enables more rapid operation and more rapid completion of formation testing.
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