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Tool string depth and tension are readily consumable gauges of the progress and status of logging operations. During logging operations, JRSO convention widely distributes Schlumberger winch position (WPS) data via RigWatch displays.
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Schlumberger provides JRSO with winch position telemetry. Software systems have (repeatedly) been implemented to make that data more widely available. The present "SLB to RW system" converts Schlumberger WPS protocol winch position data to WITS. The WITS data is passed to RigWatch.
SLB to RW is presently hosted on a Dell laptop. The software system processes WPS telemetry through three serial devices:
- COM4 - Input. WPS Winch position telemetry is received via an RS485 serial connection from the Schlumberger rack.
- COM3 - Output. "SLB to RW" formats incoming WPS winch telemetry (COM4) to WITS. The WITS stream is forwarded to COM3 (RS232).
- COM1 - Output from "SLB to RW". Input WITS to RigWatch.
- COM3 is physically connected in loopback fashion to COM1. The loopback cable is known as a null-modem or cross-over cable.
- During operations the RigWatch Master receives WITS
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- -formated winch telemetry--across the network--on device "COM1 - Remote 6"
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- . Rephrased: the RigWatch instance on
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- the Dell laptop (i.e. Remote 6 or 192.168.1.11) passes COM1 data to the RigWatch Master--only when the Master is configured to listen for that device.
This diagram accurately depicts the flow and handling of winch position telemetry through the present Dell laptop (and any subsequent system that may be put in place). The COM port numbers in the diagram are inaccurate and superseded by the text above.
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- Repeated install and rollback attempts with the NI PXI-8106 embedded controller led to the realization that its on-board network controller is failing.
- The device has been carried forward as a one-off without spares for some time.
Archived versions
Logging Winch Telemetry to Rigwatch - 27Sept2022