Switchable Downhole Crossover Tool for Cementing
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Solution Overview
Problem
Conventional cementing methods in oil field recovery operations face challenges such as cement loss into weak formations due to high hydrostatic pressure, leading to increased costs and potential casing string movement issues, and require longer job times with reverse circulation methods.
Innovation Solution
A crossover tool that can switch between conventional and reverse circulation modes, allowing for controlled fluid circulation and cement placement, using a tool body with a valve and packer assembly to isolate flow paths and manage pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional circulation cementing is used, then cement can be pumped down the casing string and up the annulus, but high hydrostatic pressure causes cement loss into weak formations and may float the casing string
Solution Approach 1:
The patent applies reverse circulation cementing where cement slurry is introduced into the annular space and returns up the casing string, inverting the conventional flow path. This inversion eliminates the need to lift high-density cement up the annulus, reducing hydrostatic pressure on weak formations and preventing cement loss while also preventing casing string flotation.
2Loss of substance
If reverse circulation cementing is used, then cement loss into formation is reduced, but job duration increases due to longer pump time
Solution Approach 1:
The crossover tool provides multi-functionality by enabling both reverse circulation cementing and conventional circulation methods within a single tool assembly. The tool can switch between flow paths (reverse and conventional) using a rotatable sleeve mechanism, allowing operators to optimize for either reduced cement loss or reduced job duration depending on formation conditions and operational requirements.
3Adaptability or versatility
If crossover tool with rotatable sleeve is used, then flow path switching is enabled, but device complexity increases
Solution Approach 1:
The patent uses hydraulic actuation through a piston mechanism to enable flow path switching in the crossover tool. Fluid pressure applied to the piston moves it axially, which in turn rotates the sleeve to different positions, opening or closing different flow paths. This hydraulic actuation provides adaptive flow control without requiring complex mechanical linkages or external actuation systems.
Data Source
AI summary
A system, method, and tool for controlling fluid flow in a wellbore. The system comprises a tubing string locatable in the wellbore and a crossover tool for enabling reverse circulation in the wellbore. The crossover tool comprises a tool body, a packer assembly, a drag block assembly, and a sleeve. The tool body comprises a bore in fluid communication with the tubing string and a valve located in the bore. The packer assembly is coupled to the tool body and creates a fluid barrier in the annulus formed between the tubing string and the wellbore. The drag block assembly engages the wellbore and resists axial movement. The sleeve is located in the tool body and axially moveable relative to the drag block assembly. The drag block assembly is coupled to the sleeve, and axial movement of the sleeve relative to the drag block assembly rotates the sleeve to control the valve.