DEVICE FOR TESTING STRATA Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: device is designed for revealing prospective productive horizons in the course of boring with remote and autonomous measurement of parameters. Metering device is provided with switch spring disposed over brake spring; stop sleeve installed between brake spring and switch spring; power plunger; and cartridge with shaped stepped cavity installed inside casing. The rod has spline swelling placed in cartridge cavity, whereas return valve is located in inlet hole of casing. The latter accommodates power chamber, and power plunger is located in power chamber of casing. EFFECT: improved quality and reliability of testing wells.