Stratigraphic Factor Modeling for Wellbore Collision Avoidance

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Solution Overview

Problem

Existing wellbore drilling technologies face challenges in accurately determining well trajectories to prevent collisions, particularly in densely drilled environments, due to measurement uncertainties and complex geological formations, leading to risks such as blowouts and environmental harm.

Innovation Solution

The Stratigraphic Factor (STF) method integrates stratigraphic data with geosteering systems to enhance wellbore trajectory planning and real-time adjustments, using measurement-while-drilling (MWD) and logging-while-drilling (LWD) data to calculate true vertical thickness (TVT) and true stratigraphic thickness (TST), and apply a stratigraphic factor (STF) to assess collision risks, ensuring precise well placement relative to geological formations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional wellbore drilling methods are used without stratigraphic factor integration, then drilling operations can proceed with standard trajectory planning, but collision risks increase due to measurement uncertainties and complex geological formations

Engineering Contradiction:

Improvecollision risk reductionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines stratigraphic data processing capabilities directly into the geosteering system, merging previously separate functions (stratigraphic analysis and trajectory planning) into an integrated platform. This allows the system to simultaneously process formation data, calculate stratigraphic factors, and adjust wellbore trajectories, thereby reducing collision risks without requiring multiple independent systems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stratigraphic factor serves as an intermediary parameter that bridges raw geological measurements and trajectory decision-making. By introducing this intermediate calculation layer, the system translates complex stratigraphic variations into actionable guidance for wellbore positioning, reducing the information gap between geological data and drilling control

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If real-time trajectory adjustments are made using STF calculations, then wellbore positioning precision improves, but computational requirements and processing time increase

Engineering Contradiction:

Improvewellbore positioning precisionVSAvoidcomputational processing time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system performs preliminary stratigraphic modeling and factor calculations during the planning phase before actual drilling begins. By pre-computing expected stratigraphic variations and preparing adjustment protocols in advance, the system reduces the computational burden during real-time operations, enabling rapid trajectory adjustments without extensive on-the-fly calculations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a tiered approach where full STF calculations are performed only when triggered by specific conditions (e.g., proximity to known wells, detected stratigraphic anomalies). For routine drilling segments, simplified monitoring and less frequent calculations are used, reducing overall computational load while maintaining positioning precision when it matters most

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If dense well drilling is implemented to maximize hydrocarbon recovery, then production efficiency increases, but the risk of wellbore collisions between adjacent wells increases

Engineering Contradiction:

Improvehydrocarbon recovery efficiencyVSAvoidwellbore collision risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors actual wellbore positions against planned trajectories and adjacent well locations, using real-time STF calculations to provide feedback on collision risks. This closed-loop approach allows operators to detect potential collision scenarios early and make corrective trajectory adjustments, enabling dense well spacing to be maintained safely while maximizing hydrocarbon recovery

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250277438A1Well Anti-Collision Using A Stratigraphic Factor Model

Publication Date: 2025.09.04 RNA CAPITAL INC

AI summary

A method for avoiding well-to-well collisions by ascertaining true vertical thickness (TVT) and true stratigraphic thickness (TST) to form an integrated Stratigraphic Separation Factor (STF) computation that identifies the stratigraphic gap between distinct points along separate wellbore trajectories. A system may use a variety of measurements including subsurface sensors to perform the STF computation and its integration with drilling and geo-navigating downhole tools.