Self-Adaptive Wellbore Trajectory Survey Calculation
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Solution Overview
Problem
Current methods for survey calculation of wellbore trajectories in oil and gas drilling assume a consistent curve type, leading to significant errors due to changes in drilling parameters and geology, and are sensitive to measurement errors, especially in shorter intervals.
Innovation Solution
A self-adaptive method that calculates coordinate increments by analyzing survey data from multiple intervals, determining curve characteristics, and selecting an appropriate curve type to match the wellbore trajectory, reducing errors by fitting the curve type closest to the actual trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cubic spline interpolation is used to reduce calculation errors, then trajectory calculation accuracy is improved, but the method becomes sensitive to measurement errors and produces oscillation in shorter intervals
Solution Approach 1:
The patent divides the wellbore trajectory into multiple survey intervals, each processed independently with its own curve type determination. This segmentation allows each interval to be optimized without being affected by errors in other intervals, reducing overall sensitivity to measurement errors while maintaining high calculation accuracy.
Solution Approach 2:
The patent dynamically determines the curve type for each survey interval based on the specific characteristics of that interval rather than using a fixed interpolation method. This dynamic adaptation allows the system to respond to varying measurement conditions and geological conditions, reducing oscillation and improving reliability in shorter intervals.
2Device complexity
If a single curve type is assumed for all survey intervals, then the calculation method is simple, but trajectory calculation errors increase when the assumed curve does not match the actual curve
Solution Approach 1:
The patent applies different curve types to different survey intervals based on their specific characteristics. Instead of using a single curve type for the entire trajectory, the system determines the appropriate curve type for each interval locally, improving accuracy without significantly increasing overall complexity through automated determination.
Solution Approach 2:
The patent changes the curve type parameter for each survey interval based on calculated characteristics such as curvature and torsion. This parameter adaptation allows the system to automatically adjust to varying geological conditions and drilling parameters, improving accuracy while keeping the method practical through automated parameter selection.
3Measurement precision
If survey intervals are made shorter to improve measurement precision, then calculation accuracy improves, but the system becomes more sensitive to errors and may produce unreasonable oscillation
Solution Approach 1:
The patent determines the appropriate curve type for each short survey interval based on its specific characteristics. This local adaptation ensures that even short intervals with potentially noisy measurements are processed with the most suitable mathematical model, reducing error sensitivity and preventing oscillation while maintaining high precision.
Data Source
AI summary
The disclosure relates to a method for self-adaptive survey calculation of a wellbore trajectory in oil drilling, and belongs to the field of oil and gas drilling technologies. Curve characteristics of a calculated survey interval are identified by calculating measurement parameters of four survey stations corresponding to the survey interval and two survey intervals before and after the survey interval, so that an appropriate curve is selected to calculate a coordinate increment of the survey interval, then parameters of the curve characteristics which are close to the shape of the calculated wellbore trajectory are selected automatically, and the curve type which is closest to an actual wellbore trajectory is fitted automatically and the survey calculation is carried out.