Dual Sensor Freepoint Tool

Precision Downhole Free-Point Determination with Dual-Sensor Technology

The Dual Sensor Freepoint Tool is an advanced wireline-deployed downhole diagnostic instrument engineered to accurately identify the free point-the precise depth in a drill pipe, tubing, or casing string below which the pipe is stuck and above which it remains free to move. This tool is a critical component of pipe recovery and fishing operations, delivering high-confidence measurements that enable optimized workover plans, reduced rig time, and more efficient downhole intervention strategies.

In contrast to traditional mechanical free-point indicators, the Dual Sensor Freepoint Tool combines two independent high-precision sensors typically a stretch (axial strain) sensor and a torque (twist) sensor to measure elastic deformation behavior within the tubular string under controlled surface pull and torsional inputs.

What Is Free Point and Why It Matters?

In pipe recovery operations, the "free point" refers to the transition depth between the free and stuck sections of a tubular string. Above the free point, the pipe can be moved, rotated, and manipulated from surface equipment; below it, movement is constrained due to downhole sticking mechanisms such as differential pressure, key seating, washouts, or formation/drag effects.

Correctly identifying this free point is essential for:

◆ Efficient fishing and milling plans

◆ Avoiding unnecessary cutting below the stuck location

◆ Minimizing rig hours and operational costs

◆ Enhancing well integrity and safety during recovery

A mis-identified free point can lead to excessive pipe cutting, deeper milling requirements, and significantly increased workover risks.

High-Precision Dual Sensing

Stretch (axial) and torque (rotational) sensors independently monitor mechanical responses.

Improved detection confidence compared to single-sensor tools by cross-validating deformation behaviors.

Reliable Downhole Response

Designed to operate reliably under typical wellbore conditions encountered in drilling and workover environments.

Engineered to handle axial and torsional loads with accurate signal conditioning for real-time interpretation.

Depth-Accurate Correlation

Integrated depth referencing - often via CCL or other indexers - ensures measured responses align precisely with depth markers, eliminating guesswork.

Operational Efficiency

Dual sensor data reduces ambiguity, enabling faster stuck point identification and minimizing rig down time.

Reduces the risk of unnecessary pipe cutting and lowers tool run durations.

The Dual Sensor Freepoint Tool is applicable in a range of scenarios:

◆ Stuck Drill Pipe & Drill Collars

Pinpoint the deepest section of free pipe above a stuck drill string, enabling efficient back-off or milling operations.

◆ Tubing & Casing Stuck Situations

Determine free point in deviated or horizontal wells where friction and differential pressure can cause partial or complex pipe sticking.

◆ Fishing Planning

Provides essential data for fishing tool selection and vectoring of recovery actions.

◆ Well Integrity Assessment

Used in workover planning to confirm pipe status before remedial operations.

◆ Enhanced Precision-Dual sensors deliver higher confidence levels in free vs. stuck discrimination.

◆ Robust Design-Built to withstand downhole conditions while maintaining measurement fidelity.

◆ Operational Savings-Faster diagnostics lead to reduced rig costs and minimized fishing time.

The Dual Sensor Freepoint Tool represents a scientifically grounded solution for free point determination in complex downhole environments. Its integration of dual measurement principles stretch and torque elevates the accuracy of stuck pipe identification and supports rigorous workover planning. By providing clear, depth-correlated, and dual-validated data, this tool enables drilling and workover teams to make informed decisions reducing costs, mitigating risk, and improving recovery outcomes.

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