Schlumberger

Thema Drilling Operations Support & Analysis Service

Overview Library

Real-time evaluation of surface logging data and other surface measurements

Thema service monitors and analyzes fluid influx and loss in the wellbore, drilling mechanics and dynamics, hole-cleaning efficiency, and a range of geological data. It also offers superior detection of the C1–C5 components in gas extracted from the drilling mud for gas ratio analysis.

Superior data quality and speed

Signals are converted from analog to digital as close to the sensors as possible, eliminating analog signal transmission and the need for multiple cables running across the rig floor. High-frequency acquisition, improved data resolution, and increased storage and computation capacity enable faster processing of complex data.

Real-time monitoring and analysis

Thema service analyzes real-time data streams from a number of sensors and displays decision-ready information on drilling performance and safety via customizable screens. A summary of the real-time status of the well is obtained by combining depth- and time-based data related to

  • Wellbore pressure balance
    Fast, reliable detection of fluid influx or loss in the wellbore, even at very low volumes, gives a valuable edge during drilling operations. The system reduces the number of “false alarms”, which require time-consuming flow checks. Early kick detection is further supported by pumpoff gas analysis to identify potential underbalance situations. Automatic flowback fingerprint is captured and displayed on screens when the rig pumps are stopped, for quick and easy visual reference.
  • Drilling mechanics
    The wear and behavior of the drill bit are assessed by monitoring key drilling parameters—axial (bit bouncing) and torsional (stick/slip) vibration frequencies and energy—through measurements made by surface sensors. Potential issues like bit balling, drillstring vibration, and bit wear can be anticipated and drilling parameters can be optimized to improve ROP and increase equipment life.
  • Hole condition
    Wellbore stability and hole-cleaning efficiency are analyzed in real time by comparing measurements of relevant parameters—such as pickup, slack-off, and free-rotating weights; torque; and equivalent circulating density (ECD)—with theoretical values calculated using industry-standard models. Hole-condition monitoring can be further enhanced through the use of cuttings flowmeters.

Expert support

Thema service includes engineers both on the rig and in your office, working together to ensure that the right information is delivered within your organization in a timely manner. They are supported by remotely based engineers and geoscientists with global experience in optimizing drilling operations.

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Geoservices Mud Logging

Evaluate and Adjust Drilling Parameters in Real Time

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