Pulse-Code Testing (PCT) is the modern development of cross-well pressure interference testing, based on bottom-hole pressure response in one well to the rate variation in another well.

Unlike traditional interference test which is based on step-response analysis while responding well and surrounding wells are shut-in the PCT procedure assigns a generating well to change flow rate in a certain pre-calculated sequence and does not require shutting down other wells. This creates coded pressure pulsations propagating throughout the formation which are captured by downhole gauges and decoded at surface.

This allows conducting the cross-well scanning in the group of highly interfering wells without punishing production losses.

The PCT engine is based on the modern parallel signal decoding algorithms, multi-core workstations and high resolution of downhole quartz gauges and flowmeters.

International patent PCT/RU2016/000430

  • Production Enhancement
    • Locating priority zones for the new wells and side-tracks
    • Selecting priority candidates for workovers (water shut-off, stimulation, fracturing)
    • Optimize production targets
    • Control of displacement efficiency in waterflooding
    • Identifying the best candidates for converting to injection
  • Reservoir Study
    • Assessing the length and orientation of hydraulic fractures
    • Assessing the length and orientation of hydraulic fractures
    • Assessing the length and orientation of hydraulic fractures
    • Localizing the barriers and pinch outs
    • Calibrating shale breaks
    • Quantification of the cross-well interferencу
    • Quantification of reservoir properties in cross-well interval
    • Quantification of reservoir properties in near-well area
    • Assessing formation permeability
    • Assessing formation compressibility
    • Assessing end-points in relative permeabilities
    • Early diagnostics of complications
  • Multi-well scanning
  • No requirements to shut-in the test well and off-set wells
  • High tolerance to external contamination of unknown origin
  • Early diagnostics of well and reservoir underperformance