Downhole Tool Activation via Differential Pressure Piston
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Solution Overview
Problem
Existing downhole tool deployment and activation systems face challenges in accurately activating tools like drill pipe cutters or hole punchers without premature activation and ensuring efficient fluid circulation post-activation.
Innovation Solution
A novel apparatus featuring a differential pressure piston system with shear pins, sealing members, and centralizer assemblies that deploy and activate tools by utilizing well bore fluid pressure to shear pins, allowing controlled activation and maintaining fluid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a downhole tool is deployed using existing systems, then the tool can be activated, but premature activation may occur or activation accuracy is compromised
Solution Approach 1:
The apparatus is prepared and positioned in the drill pipe string before deployment, with the sealing member and differential pressure piston system pre-configured. The tool is activated only after the sealing member is seated in the pipe joint profile and the differential pressure piston is positioned to engage the shear pins, ensuring activation occurs at the precise intended location and time rather than prematurely during deployment.
Solution Approach 2:
The differential pressure piston acts as an intermediary mechanism between the well bore fluid pressure and the shear pins. The piston translates fluid pressure into mechanical force to shear the pins, providing a controlled and accurate activation mechanism that prevents premature activation while ensuring reliable tool activation at the desired moment.
2Measurement precision
If a sealing mechanism is used to activate the tool, then activation control is improved, but fluid circulation may be blocked
Solution Approach 1:
The sealing mechanism is segmented into a sealing member and a differential pressure piston system rather than using a single continuous seal. The sealing member seats in the pipe joint profile to provide partial sealing for activation control, while the differential pressure piston with its rod and shear pin configuration creates a controlled fluid pathway that allows circulation to continue after activation, thus segmenting the sealing function to resolve both activation control and circulation needs.
3Measurement precision
If a complex activation system is used, then activation accuracy is improved, but device complexity increases
Solution Approach 1:
The activation system uses well bore fluid pressure acting on the differential pressure piston to trigger the shear pins and activate the tool. This hydraulic mechanism provides precise activation control through pressure differential rather than complex mechanical linkages, reducing overall system complexity while maintaining high activation accuracy. The fluid pressure system is simpler than alternative mechanical activation mechanisms.
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
Enables precise activation of downhole tools while ensuring fluid circulation is maintained, allowing for effective deployment and operation of tools like drill pipe cutters or hole punchers without premature activation.
Implementation Method 1
utilizing well bore fluid pressure to shear pins
Implementation Method 2
shear pins
Implementation Method 3
capable of forming a partial seal within a drill pipe string sufficient to cause an increase in fluid pressure above the sealing member when seated in a pipe joint
Data Source
AI summary
An apparatus for deploying and activating a downhole tool activated by an explosive charge such as a drill pipe cutter or hole puncher. The apparatus includes a sealing member with an external wedge-shaped profile that forms a metal-to-metal partial seal with a profile at the top end of a pipe joint in a drill pipe string. The apparatus includes an impact force absorbing device that maintains a firing rod in a non-actuated position during impact of the apparatus. The apparatus includes a differential pressure piston that actuates at a pre-determined well bore pressure to release the firing rod to activate the downhole tool.