AI Geosteering Control Using Resistivity Inversion
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Solution Overview
Problem
Existing geosteering methods struggle to accurately control the directional wellbore within a pay zone to minimize gas or water breakthrough and maximize hydrocarbon production, particularly in complex geological environments with lateral variations and fractures.
Innovation Solution
Utilizing resistivity measurements and an artificial intelligence framework to generate a structural representation of the subsurface environment, enabling precise control instructions for lengthening the borehole along a desired trajectory through resistivity measurement-based inversion and geosteering actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional geosteering methods are used to control directional wellbore, then basic directional control is achieved, but accuracy in maintaining wellbore within pay zone deteriorates in complex geological environments
Solution Approach 1:
The system transforms raw resistivity measurements into structural representations by changing the parameter domain from electrical properties to geological structural properties. This transformation enables accurate wellbore positioning in complex geological environments by interpreting resistivity data in terms of pay zone boundaries and reservoir geometry, directly resolving the contradiction between positioning accuracy and adaptability to complex geology.
Solution Approach 2:
The artificial intelligence framework acts as an intermediary between raw resistivity measurements and geosteering control decisions. It processes the complex relationship between electrical properties and geological structures, providing accurate wellbore positioning information without requiring direct interpretation of complex geological environments, thus resolving the contradiction between measurement precision and environmental adaptability.
2Measurement precision
If real-time resistivity measurements and AI processing are implemented, then wellbore control accuracy is improved, but system complexity increases
Solution Approach 1:
The downhole tool performs multiple functions: acquiring resistivity measurements, the processor performing inversion to generate structural representations, and the system providing wellbore positioning and control guidance. This multi-functionality integrates what would otherwise be separate complex systems into a unified tool, improving wellbore positioning accuracy while managing overall system complexity through functional integration.
Solution Approach 2:
The system performs self-processing of resistivity measurements through onboard inversion algorithms and AI frameworks. The downhole tool autonomously generates structural representations and provides wellbore positioning information without requiring extensive external processing, thereby improving positioning accuracy while containing system complexity through self-sufficient operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the ability to maintain the wellbore within a targeted reservoir section, minimizing breakthroughs and maximizing hydrocarbon production by providing real-time, data-driven directional control.
Implementation Method 1
acquire resistivity measurements using a downhole tool of a drillstring disposed in a borehole
Data Source
AI summary
A method can include acquiring resistivity measurements using a downhole tool of a drillstring disposed in a borehole in a subsurface environment; performing a resistivity measurement-based inversion to generate a structural representation of a portion of the subsurface environment that includes an end of the borehole; generating a control instruction using an artificial intelligence framework and the structural representation, where the control instruction is for lengthening the borehole along a current borehole trajectory or a different borehole trajectory; and controlling the drillstring to lengthen the borehole based on the control instruction.