Downhole Force Generating Tool Rotor-Stator Sleeve
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Solution Overview
Problem
Existing downhole tools lack the ability to effectively force a tubing string and/or bottom hole assembly (BHA) into a well, as they do not generate sufficient downward force.
Innovation Solution
A downhole tool comprising a central element and a sleeve that rotates and orbits responsive to fluid flow, utilizing a rotor and stator profile mechanism similar to a Moineau principle pump/motor, to create downward force by interacting with the wellbore or casing, thereby advancing the tubing string and/or BHA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fluid is flowed through the downhole tool to rotate and orbit the sleeve, then motive force is generated to advance the tubing string and BHA into the well, but the tool complexity increases due to the rotor-stator mechanism
Solution Approach 1:
The patent employs hydraulic principles by utilizing fluid flow through the downhole tool to generate rotational and orbital motion of the sleeve. The fluid pressure differential across the rotor-stator mechanism converts hydraulic energy into mechanical motion, producing the necessary downward force to advance the tubing string and BHA into the wellbore.
Solution Approach 2:
The invention incorporates dynamic motion by allowing the sleeve to both rotate and orbit around the central element. This compound motion pattern enables the engaging members on the sleeve to interact with the wellbore wall in a scanning manner, generating continuous downward force while adapting to variations in wellbore geometry and resistance.
2Productivity
If the sleeve rotates and orbits around the central element to generate motive force, then the tubing string and BHA can be advanced into the well, but the device complexity increases
Solution Approach 1:
The downhole tool integrates multiple functions within a single device: the rotor-stator mechanism simultaneously generates rotational motion, orbital motion, and the resulting downward force. The engaging members on the sleeve perform both cutting/scrapping functions and propulsion functions, eliminating the need for separate vibration generators and force application mechanisms.
Solution Approach 2:
The invention merges the rotor and stator components into an integrated assembly where the rotor is positioned within the sleeve containing the stator. This combined structure allows the fluid-driven rotor to directly drive the sleeve's orbital motion, consolidating what would traditionally require separate vibration generation and force application systems into a single unified mechanism.
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 generates motive force to advance the tubing string and/or BHA into the well by using fluid flow to rotate and orbit the sleeve, ensuring successful insertion and overcoming resistance in the wellbore.
Implementation Method 1
The sleeve rotates and orbits around the central element/member responsive to fluid flowing through the downhole tool
Implementation Method 2
utilizing a rotor and stator profile mechanism similar to a Moineau principle pump/motor, to create downward force
Data Source
AI summary
The disclosure of this application is directed to a downhole tool comprising a central element/member and a sleeve that is rotatably and orbitally disposed around the central element/member. The sleeve rotates and orbits around the central element/member responsive to fluid flowing through the downhole too. The disclosure is also related to a method of advancing the downhole tool in a well by flowing fluid through the tool.