Dogleg Severity Modeling Using Beam Bending and Contact Models
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Solution Overview
Problem
Current directional drilling methods lack accurate models for dogleg severity (DLS) that account for varying contact points and bending effects, leading to inefficiencies in controlling borehole curvature and trajectory.
Innovation Solution
The development of methods to model DLS by considering defined and undefined contact points, including low-side and high-side contact points, and incorporating bending effects caused by load on the drilling tool, using equations to calculate curvature and radius, and inputting these into a DLS model to determine the dogleg severity in degrees per 100 feet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current directional drilling methods are used without accounting for varying contact points and bending effects, then the modeling process is simpler, but the accuracy of dogleg severity modeling deteriorates
Solution Approach 1:
The patent segments the borehole into multiple sections with different contact point configurations (low-side, high-side, undefined contact points). Each segment is modeled separately using appropriate equations, allowing the system to account for varying contact points and bending effects throughout the wellbore while maintaining manageable computational complexity
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple contact point scenarios (low-side, high-side, undefined) and their corresponding bending effect equations before actual drilling operations. This allows the modeling system to quickly select and apply the appropriate mathematical model based on actual drilling conditions, improving accuracy without requiring complex real-time analysis
2Reliability
If traditional DLS modeling methods are used that do not account for bending effects, then the modeling calculations are faster, but the control of borehole trajectory becomes less accurate
Solution Approach 1:
The patent changes the parameters of the DLS model by incorporating bending effects as additional variables that modify the basic curvature calculations. The model dynamically adjusts parameters such as contact point location and bending moment based on drilling conditions, improving trajectory control reliability while using efficient computational methods to minimize calculation time
3Ease of operation
If a simplified DLS modeling approach is used, then the ease of operation is improved, but the ability to handle various contact point scenarios deteriorates
Solution Approach 1:
The patent creates a universal DLS modeling system that can handle multiple contact point scenarios (low-side, high-side, and undefined contact points) through a unified mathematical framework. The model automatically adapts to different drilling conditions by selecting the appropriate contact point configuration, providing versatility while maintaining ease of operation through automated scenario selection
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
This approach provides a more accurate and simplified modeling system for DLS, enabling better control of borehole curvature and trajectory, applicable to various drilling operations including oil, gas, and geothermal wells.
Implementation Method 1
inputting a set of tool parameters and load parameters into a beam bending model which models bending effects of the drilling tool during a drilling operation
Implementation Method 2
deriving an angular rotation of the drilling tool due to bending effects from the beam bending model
Data Source
AI summary
A method of modeling dogleg severity (DLS) of a borehole that can be drilled using a drilling tool includes inputting a set of tool parameters and load parameters into a beam bending model which models bending effects of the drilling tool during a drilling operation, deriving an angular rotation of the drilling tool due to bending effects from the beam bending model, inputting the angular rotation into a contact model as a bend angle modifier, wherein the contact model generates a general curvature based the borehole contact points of the drilling tool, deriving a radius of the general curvature of the drilling tool from the contact model, inputting the radius into a DLS model, and deriving a DLS of the borehole from the DLS model.