Wellbore Collision Avoidance via Uncertainty Modeling
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Solution Overview
Problem
In hydrocarbon production from shale reservoirs, the low permeability of shales requires denser wellbore spacing and hydraulic fracturing, increasing the complexity of avoiding direct and indirect wellbore collisions due to uncertainties in wellbore positions and fracture diameters.
Innovation Solution
The use of a system that plans and steers wellbore trajectories, incorporating actual and planned trajectories of nearby wellbores, positional uncertainties, and fracture diameters to prevent collisions, employing LWD and MWD tools with real-time data processing to adjust drilling directions and provide course corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If denser wellbore spacing is used to compensate for low shale permeability, then hydrocarbon production efficiency is improved, but the risk of wellbore collisions increases due to positional uncertainties and fracture interactions
Solution Approach 1:
The system performs preliminary planning of wellbore trajectories before drilling by integrating fracture propagation models and uncertainty analyses. This advance planning allows optimization of well spacing and trajectory design to maximize drainage efficiency while pre-identifying potential collision risks, thereby resolving the contradiction between dense spacing for productivity and collision avoidance for reliability
Solution Approach 2:
The system implements real-time feedback during drilling operations by continuously monitoring wellbore positions, comparing actual trajectories against planned paths, and adjusting drilling directions to avoid collisions. This feedback mechanism enables dense well spacing to be maintained for productivity while dynamically managing collision risks through course corrections
2Productivity
If multiple wellbores are drilled closer together to achieve adequate drainage in low permeability shales, then drainage efficiency is improved, but the complexity of tracking and managing wellbore positions and fracture diameters increases
Solution Approach 1:
The system employs a unified multi-functional platform that integrates fracture propagation modeling, wellbore trajectory planning, real-time position tracking, and collision risk assessment into a single comprehensive management system. This universal approach handles multiple wellbores simultaneously, reducing the operational complexity that would otherwise arise from managing each wellbore and its associated fracture network separately
Solution Approach 2:
The system transforms complex geological and operational parameters (fracture diameters, wellbore positions, permeability variations) into standardized digital representations that can be processed and managed systematically. By changing the state of these parameters into a unified data framework, the system enables efficient management of dense well patterns without proportionally increasing operational complexity
3Reliability
If real-time monitoring and course corrections are implemented to avoid wellbore collisions, then collision risk is reduced, but the cost and time required for drilling operations increases
Solution Approach 1:
The system applies real-time monitoring and course correction selectively based on calculated collision risks. Rather than continuously adjusting all wellbores, the system focuses corrective actions only on wellbores where collision risk exceeds predetermined thresholds, thereby maintaining collision avoidance reliability while minimizing unnecessary drilling interruptions and time losses
Data Source
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AI summary
Planning and/or drilling wellbores. At least some of the various embodiments are methods including: receiving data indicative of position of a first wellbore; reading data indicative of position of an offset wellbore; reading data indicative of a fracture diameter for the offset wellbore; calculating a first positional uncertainty of the first wellbore; calculating a second positional uncertainly of the offset wellbore taking into account the data indicative of position and the data indicative of fracture diameter; and generating a value indicative of proximity of the positional uncertainties.