DEVICE FOR MEASUREMENT OF PIPE STRING LENGTH Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry; applicable in determination of pipe string length in round-trip operations. SUBSTANCE: device has power unit, dynamometer connected with nonsparking unit, controller whose input is connected with control unit, input- output of controller is connected with memory unit, the first, second and third outputs of controller are connected respectively with inputs of information transmission unit, limit values unit and indication unit, and the fourth output of controller via nonsparking unit is connected to display board. Device is provided with pipe weighing unit including switch and two amplifiers. One of amplifiers has considerably higher gain factor than the other one. Inputs of amplifier are connected to nonsparking unit, and their outputs, with switch whose output is connected with controller input. The fifth output of controller is connected with switch control input. Dynamometer may have load cell in form of flexible beam carrying cemented resistance strain gages, converter and appliances for unit fastening to immovable flexible member. Fastening appliances consist of posts and pressing-bending device. Information transmission unit or portable computer and/or radio channel. EFFECT: higher accuracy of measurement and operate reliability of device. 3 cl, 3 dwg