The MxL Downhole Induction Heating System

By: Madis Engineering  09-12-2011
Keywords: Induction Heating, Induction Heating System

Monday • December 5 • 2011
The MxL Induction Heating System heats the near well bore at the production zone thus decreasing oil viscosity to improve oil mobility both in the zone and at the pump suction. The inductive method of heating transfers the energy directly from the tool to the well casing which, since it is in direct contact with the reservoir rock, transfers the heat efficiently at the lowest possible annulus temperature. Since the tool surface does not have to be at a high temperature there is no tendency for the tool to scale, overheat and burnout. One of these tools has been in almost constant use since 1997 and others have been in service for more than two years. They have been re-deployed from well to well, and used as a data gathering system to define production from multi zones and from different levels within a zone.
The MxL system is a retrofit system suitable for vertical, deviated or horizontal completions wherein one or more inductors are attached to the bottom of the production tubing in order to heat the production zone.
Electrical power is applied to an Electric Submersible Pump (ESP) cable strapped to the side of the production tubing utilizing a regular ESP power feed through and appropriate tubing hanger at the wellhead. The system utilizes the production casing as an inductively heated element to conduct heat and electrical energy into the production zone.
The Power Conditioning Unit (PCU), computer and power controls are set up so that power to the three inductor sections can be varied to heat the casing through electromagnetic induction in a selective and controllable manner.
The MxL tool's inductors are configured to use 50 to 180 Hz three phase modified output waves from the PCU. Resistance measurements are used to indicate temperature at each inductor section and the PCU shuts down periodically to obtain readings that are indicative of the average inductor section temperature. Additional "signature" readings are also included to measure specific location temperatures and bottom hole pressure and return that information on the supply cables. These signature readings are retained in the logged data for periodic evaluation of the system and if proven to be reliable may be selected as control inputs.
The PCU has data logging and controls to set power limits based on the greater of either downhole temperature or maximum KVA, for each of three sections, and to retain operating information for later evaluation. System control interlocks are included to provide high current trip, pump trip, low flow trip and provide an operator controlled output contact to signal if the PCU has tripped off.
 

Keywords: Induction Heating, Induction Heating System

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