Dual-Mode Circulation Tool With Metallic Seals for High-Temperature Wells
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Solution Overview
Problem
Existing fluid circulation tools fail to reliably seal or unseal fluid flow in high-temperature environments due to the limitations of elastomer or polymer seals, and there is a need for a hydraulically controllable tool that can switch between flow-through and annular modes for fluid circulation in downhole applications.
Innovation Solution
A fluid-driven, dual-mode circulation tool with metallic seals that uses a ratchet mechanism to alternately seal and unseal fluid ejection paths, allowing switching between flow-through and annular modes by controlling fluid pressure, suitable for high-temperature conditions and integration into a Bottom Hole Assembly (BHA).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomer or polymer based seals are used for sealing/unsealing fluid flow, then the sealing mechanism is simple and easy to manufacture, but the seals fail to perform reliably in high temperature environments (above 350° F.)
Solution Approach 1:
The patent changes the material parameter of the seals from elastomer/polymer to metal, specifically using metal-to-metal sealing surfaces. This material substitution fundamentally alters the temperature resistance characteristic, allowing the seals to operate reliably in high temperature environments above 350° F. where elastomeric seals would fail.
2Adaptability or versatility
If a circulating tool allows fluid to flow through a specific section, then fluid circulation is achieved, but the ability to selectively prevent fluid flow through particular sections is limited
Solution Approach 1:
The patent employs a dynamic valve cycling mechanism that can switch between different flow paths (flow-through mode and annular mode) based on operational requirements. The valve system transitions from static to dynamic operation, allowing selective opening and closing of different sections to control fluid flow direction and path.
Solution Approach 2:
The patent utilizes hydraulic actuation where fluid pressure differential drives the valve cycling mechanism. The hydraulic system uses pressure differentials to automatically open and close valves, eliminating the need for complex mechanical actuators and simplifying the overall control system while maintaining flow control flexibility.
3Reliability
If metallic seals are used instead of elastomeric seals, then reliability in high temperature environments is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces the elastomeric sealing mechanism with a metal-to-metal sealing system. This substitution eliminates the need for complex elastomeric component fabrication and allows for simpler manufacturing processes using standard metal forming and machining techniques, while achieving superior high-temperature performance.
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 tool effectively switches between flow-through and annular modes by using metallic seals, ensuring reliable fluid circulation and operation in high-temperature environments, enhancing flexibility and reliability in downhole applications.
Implementation Method 1
The outer surface of the ratchet tube includes a zig-zagging ratchet path with alternating peaks and valleys. The ratchet path is connected with several peak channels extending longitudinally from the ratchet path towards upper end of the ratchet tube. Outer pins extending from the inner surface of the guiding cylinder engage with the peak channels of the ratchet tube. Inner pins extending from inner surface of the cage cylinder engage with the ratchet path or with a peak channel.
Implementation Method 2
The alternate sealing induced by downstrokes of the ratchet tube is controlled by interrupting (or reducing) and then reinstating the flow of pressurized fluid through the tool. When the entrances of the first pair of fluid ejection paths are sealed, pressurized fluid flows through the second pair of fluid ejection paths results in all the fluid being pumped from surface to flow through the tool, get ejected from the lower end of the tool, and finally get delivered to the BHA installed below it.
Implementation Method 3
Interrupting and then reinstating the flow of pressurized fluid causes the tool to switch between two operating modes: flow-through mode and annular-flow mode. Downward sliding (or down strokes) of the ratchet tube induces unidirectional rotation of the cage cylinder such that on every downstroke, a pair of metallic sealing balls (preferably made of a metal alloy such as steel), included in the cage cylinder alternately seal the entrances of one of the two pairs of fluid ejection paths included in the tool.
Data Source
AI summary
Disclosed is a fluid-driven dual-mode circulation tool which is suitable for high-temperature applications, and which is operable to switch between a flow-through mode and an annular-flow mode. Switching modes is accomplished by interrupting (or reducing) and then reinstating the flow of pressurized fluid through it. In the flow-through mode, pressurized fluid flows out of the tool into the bottom hole assembly. In the annular-flow mode, the tool diverts fluid through internal paths that access the annulus of the wellbore or casing through one or more apertures on the sidewall of the tool.