Schlumberger

WellWatcher Permanent Monitoring Systems

The extensive reservoir and production data acquired by WellWatcher permanent monitoring systems' gauges and DTS systems provide a foundation for critical decision-making that helps you enhance well diagnostics, reservoir performance, and, ultimately, production management. Data can be acquired from wells where monitoring by other means (e.g., production logging) is impractical, uneconomical, or impossible, including highly deviated wells and wells with restricted access. Schlumberger offers petrotechnical services to enhance the workflows available for WellWatcher systems when you want support for your production management decisions.

Pressure Transient Analysis (PTA)

Unconventional Well Stimulation

Pressure transient analysis using WellWatcher Quartz high-resolution PT gauges  Unconventional-well stimulation using WellWatcher Extend high-resolution PT gauges 

Early water breakthrough requires operators to balance choke adjustments with the stimulation treatment. WellWatcher Quartz premium high-temperature, high-resolution PT gauges can be placed in a well to provide PTA workflows. These workflows reveal changes in skin and can be used to determine the productivity index (PI) of the well. Understanding the changes in PI enables operators to take the necessary steps to optimize production over the life of the well.

Using WellWatcher Extend high-resolution dual-sensor PT gauges in unconventional oil and gas wells to monitor bottomhole pressure helps in identifying significant changes to skin, degradation of fracture size and conductivity, and stress-related permeability behaviors. Proactively analyzing the data enables operators to monitor drawdown during production and the health of the fractures, both of which are important for long-term well performance.

ESP Management

Inflow Profiling

ESP management using WellWatcher Sapphire PT gauges Inflow profiling using WellWatcher BriteBlue multimode DTS fiber

Downhole pressure and temperature measurements obtained with WellWatcher Sapphire PT gauges can be combined with ESP surface parameters, such as variable speed drive frequency, to prevent deadheading, which often requires a costly workover and ESP replacement. The data can also be used to troubleshoot other common ESP scenarios that reduce well productivity, such as scale deposition above the pump and loss of pump submergence.

In fields with stacked reservoirs, where pressure, permeability, and oil and gas characteristics vary greatly between layers, WellWatcher BriteBlue multimode DTS fiber can be run to provide inflow profiling of individual zones. Downhole flow control valves can then be used to manage individual zones independently, without costly intervention.

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BP Optimizes Drainage of More Than 100 Million Barrels of Oil

Thermal well model and flow distribution model
WellWatcher BriteBlue multimode DTS fiber reveals flow rate changes in real time, enabling the reservoir management strategy to be adjusted accordingly. Read case study

Industry’s only PDG qualified to 200 degC for over 10 years

Pressure and temperature ratings for WellWatcher system downhole gauges
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Applications of WellWatcher Systems

  • Production allocation
  • Productivity analysis
  • Inflow profiling
  • Pressure transient analysis (PTA)
  • Decline analysis
  • Transient and thermal recovery analysis
  • Completion integrity monitoring
  • Skin evolution monitoring
  • Intelligent completions management
  • Artificial lift system optimization
  • Riser temperature monitoring
  • Opportunistic pressure buildup capture
  • Enhanced bubblepoint and sanding pressure drawdown control
  • Improved reservoir pressure history matching