Bottom Hole Assembly Fluid Flow Management
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Solution Overview
Problem
Conventional bottom hole assemblies in oil and gas wells are prone to damage and contamination due to high velocity fluid flow, which reduces the effectiveness of treatment and hydrocarbon production, as tools like shifting tools can erode or fail to operate properly.
Innovation Solution
A bottom hole assembly comprising a by-pass valve assembly, a resettable sealing assembly, and a shifting tool assembly, which allows for directional fluid flow to either an annular area or the shifting tool, enabling operation in multiple configurations to manage fluid flow and reduce tool erosion, while maintaining treatment effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high flow rate is used during treatment, then treatment effectiveness is improved, but bottom hole assembly tools are damaged or eroded
Solution Approach 1:
The bottom hole assembly is segmented into multiple functional components (shifting tool, packer, treatment port) arranged in sequence, with the shifting tool positioned above the treatment port to isolate it from direct high-velocity fluid exposure during treatment operations
Solution Approach 2:
A flow diverter or bypass mechanism acts as an intermediary to redirect high-velocity treatment fluids away from the shifting tool and other sensitive components, allowing them to pass through the treatment port without directly impacting tools positioned above it
2Ease of operation
If tools are positioned above the treatment port, then operational functionality is maintained, but tools are exposed to erosion and contamination
Solution Approach 1:
The shifting tool is positioned above the treatment port during assembly and deployment, but flow diversion mechanisms are pre-configured to redirect treatment fluids away from this tool before treatment begins, protecting it from erosion and contamination while maintaining its operational position
Solution Approach 2:
A bypass channel or flow diverter serves as an intermediary structure that intercepts high-velocity treatment fluids and redirects them through an alternative path, preventing direct contact with the shifting tool and other sensitive components positioned above the treatment port
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
The assembly effectively directs fluid flow to prevent tool damage, allowing for optimal treatment and shifting operations while maintaining production efficiency by reducing erosion and contamination risks.
Implementation Method 1
the by-pass valve assembly is operable to direct fluid flow in a first mode of operation and a second mode of operation; wherein in said first mode of operation fluid flow is directed from the first flow passage to the annular area exterior of the bottom hole assembly through the port
Implementation Method 2
a resettable sealing assembly positioned downhole of the by-pass valve assembly and comprising an up-hole end, a downhole end and a second flow passage there between
Implementation Method 3
a shifting tool assembly positioned downhole of the resettable sealing assembly and comprising an up-hole end, a downhole end and a third flow passage there between
Data Source
AI summary
The present disclosure is generally directed to a bottom hole assembly. The bottom hole assembly may include a by-pass valve assembly and a shifting tool assembly positioned downhole from the by-pass valve assembly. The bottom hole assembly may used to hydraulically fracture a wellbore and shift a well tool from a first position to a second position within the wellbore.