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Improving well depth and
3D positional uncertainty

  • Establish well depth and 3D positional uncertainty requirements upfront to optimize the well survey program.

  • Use way-points to create navigation of the well path. More way-points lead to higher data accuracy and Reduced uncertainty.

  • For drill pipe, use Driller’s Way-point Depth (DwpD) to create reference depth measurements with defined uncertainty.

  • Use 3D Way-point for determining subsurface well position using DwpD reference well depth and inclination and azimuth measurements.

  • Use 3D way-points, based on application of the Milking Chair principle to the component accuracies, to calculate subsurface N, E, and V positional uncertainties.

  • Verify that well depth and 3D positional uncertainty requirements are met.

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Reduce risk

Reduce risk

Uncertainty determines risk. Reducing uncertainty leads to lower risk.

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Uncertainty dictates risk; reducing uncertainty mitigates risk.
Defining well depth and three-dimensional positional uncertainty criteria enables operators to minimize exploration-associated risks.

 

Selecting optimal measurement and correction methods to achieve required uncertainty is crucial for establishing positional uncertainty requirements and enhancing calculated well position descriptions.


Clear measurement uncertainty objectives, derived from well depth and positional uncertainty requirements, empower service companies to deliver more efficient data and reduce inaccuracies.

Improve asset value

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Reducing uncertainty in subsurface exploration, through more accurate well placement and precise measurements, lowers operational risks, improves decision-making, and ultimately increases the value of subsurface assets by maximizing resource recovery while minimizing costs.

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Lower collision risk and better interception control

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Minimizing well depth uncertainty is crucial for reducing collision risks and optimizing intercept operations. Improved positional accuracy enhances well placement precision.

 

Advanced depth measurement processes ensure safer and more efficient well positioning, boosting confidence in both anti-collision and well intercept operations.

Improve petrophysical evaluation and geological models

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Well log depth matching is crucial for accurate petrophysical analysis. Often, post-operation synchronization is necessary to align data from various logging tools or depths. This process introduces significant assumptions about the true well depth, increasing analytical and positional uncertainty despite better-aligned logs. Implementing improved well depth procedures can substantially reduce the need for post-operation adjustments, resulting in more efficient workflows and reliable data.

 

In subsurface exploration, the quality of geological models is directly influenced by the accuracy and uncertainty of well depth data. Reducing well depth uncertainty plays a critical role in creating more reliable geological models, which are essential for understanding subsurface structures and making informed decisions about resource utilization. By reducing well depth uncertainty, operators can significantly improve the accuracy of subsurface geological models. This results in more reliable representations of geological structures, better integration of diverse datasets, enhanced structural modeling, and increased confidence in geological predictions—all of which contribute to optimized resource management and reduced operational risks.

Optimize reservoir models

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Accurate reservoir models are essential for estimating Production Initially in Place (PIIP) and optimizing resource extraction strategies. Reducing well depth uncertainty improves the accuracy of reservoir models by enhancing rock property correlation, improving vertical thickness determination, precisely identifying fluid contact levels (OWC, GWC, GOC), and providing a clearer understanding of reservoir geometry. These improvements lead to more accurate PIIP estimates and better decision-making for resource management, ultimately maximizing hydrocarbon recovery while minimizing costs.

Increase drainage efficiency and production

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In oil and gas operations, minimizing well depth uncertainty is key to optimizing well placement, recovery strategies, and production efficiency. Improving well depth uncertainty boosts production efficiency by enabling accurate well placement, better vertical thickness determination, precise fluid contact identification, optimized reservoir models, and reduced non-productive time. This results in higher recovery rates and cost savings.

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