Free Point indicator Tool
The Free Point Tool, in conjunction with a Free Point Panel, provides a survey which accurately locates where the tubing, pipe, or casing string is stuck. This tool is designed for use with the Standard NIMS Bin and a Free Point Panel – a self-contained panel unit packed in a suitcase which requires a source of 117 VAC for operation. A strip chart recorder or other recording device is required if a permanent record of the survey is required.
Mechanical Design Features
This tool features modular design in which a CCL assembly is connected to an upper motor assembly with a double male sub. A sensor assembly and the lower motor assembly connect to the upper motor assembly. A bull plug is screwed onto the lower motor assembly to protect the threads. The motor assemblies each contain a DC motor connected to three individual FP legs. When the motor is energized, the FP legs cam out and contact the pipe inner wall, effectively clamping the tool to the pipe. The tool is then locked in the pipe and is free of any influence from the logging cable. Various sizes of FP legs are available to fi t pipe sizes from 2 inches to 13-5/8inches. In the event of a surface power failure, the logging cable may be used to hoist the tool to the surface. A shear pin in the gear motor drive assembly will break before the logging line failure point is reached and the FP legs will retract completely, allowing tool retrieval. The center section of the tool assembly requires special handling since there is a soft, magnetic shield in
Electronic Design Features
The CCL assembly contains a permanent magnet and coil system designed to provide reliable detection of casing collars. The motor assemblies feature solid state electronic motor controls which sense overload in the systemandlimits the current to a safe level. This system operates to sense full open or closed condition of the FP leg assemblies and will also protect the motors in the event of a mechanical failure in the gear motor / drive assemblies. Solid state design offers trouble free operation. The sensor assembly contains a rugged electro-magnetic sensor and solid state electronics. The sensor picks up compression, tension, or torque movement of the pipe and the electronic assembly converts this motion into AC signals and transmits them uphole to the panel. Here the AC signals are converted into varying DC for display on a meter and recorded for a permanent record. The sensor assembly requires no pre- job calibration. Power to operate the electronics in the tool is provided by the uphold equipment.