Multi-lateral Well Heel-to-Toe Fracturing Optimization
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Solution Overview
Problem
In hydraulic fracturing operations, uneven fluid and proppant distribution among hydraulic fracturing clusters occur due to stress shadows, leading to non-uniform distribution and reduced hydrocarbon recovery and production performance.
Innovation Solution
Drilling multilateral wells in a heel-to-toe configuration, where the toe of one well is closer to the heel of another, and fracturing these wells in stages from toe to heel to mitigate stress shadows and promote even distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fracturing is performed on lateral wells, then hydrocarbon production is enhanced, but stress shadows cause uneven fluid and proppant distribution among fracturing clusters
Solution Approach 1:
The patent segments the lateral well into multiple discrete fracturing clusters distributed along the wellbore length. By creating numerous smaller fracture zones rather than a few large ones, the system achieves more uniform fluid and proppant distribution while collectively enhancing overall hydrocarbon production from the entire lateral section.
2Productivity
If hydraulic fractures are created in previous fracturing stages, then those stages are stimulated, but stress shadow influences the toe cluster the most and the heel cluster the least
Solution Approach 1:
The patent applies local quality by positioning fracturing clusters at specific intervals along the lateral wellbore, with particular attention to toe-side positioning. This strategic placement ensures that each cluster operates in a zone with acceptable stress shadow conditions, optimizing local fracture stimulation effectiveness while maintaining overall system productivity.
3Manufacturing precision
If more wells are added in different areas to improve fluid and proppant distribution, then distribution is improved, but well system complexity and cost increase
Solution Approach 1:
The patent merges multiple fracturing operations into a single lateral well system, combining the functions of what would traditionally require multiple separate wells. By distributing fracturing clusters along one lateral wellbore, the system achieves improved fluid and proppant distribution without the added complexity and cost of drilling and completing multiple additional wells.
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 enhances hydrocarbon production by reducing stress shadows, increasing fracture area, and improving fracture cluster efficiency, leading to higher recovery factors and increased production contributions from previously under-stimulated toe stages.
Implementation Method 1
hydraulic fracturing operations for hydrocarbon production
Data Source
AI summary
Methods of drilling two wells, wherein the two wells are drilled such that the toe of the lateral portion of one well is in proximity to the heel of the lateral portion of the other well. Production from the wells can be improved by a process wherein the formation about the wells is first fractured at the toe of each lateral portion, then fractured along the middle section of each lateral portion, and, lastly, at the heel section of each lateral portion of the wells.