Magnetic Gradient Drilling Tool with Shielding
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Solution Overview
Problem
Conventional drilling methods face challenges in achieving selective pressure drop points and rheology alteration along the annulus fluid path, leading to inefficient drilling and cementing operations, which often require multiple casing strings and can result in formation integrity loss.
Innovation Solution
The implementation of a magnetic assembly tool integrated with the drill pipe or casing, utilizing a magnetic field generator and magnetorheological fluid to create a controlled magnetic field that increases viscosity and pressure drop outside the pipe, allowing for selective pressure manipulation and reduced need for intermediate casing strings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional drilling methods are used, then drilling operations can be performed, but selective pressure drop points and rheology alteration along the annulus fluid path cannot be achieved, requiring multiple casing strings
Solution Approach 1:
The patent replaces mechanical pressure control systems with a magnetic field-based system. A magnetic assembly tool generates a magnetic field that activates magnetorheological fluid, causing it to increase in viscosity and create selective pressure drops along the annulus. This substitution of mechanical systems with magnetic field control enables versatile pressure manipulation without requiring multiple casing strings.
Solution Approach 2:
The patent utilizes magnetorheological fluid whose viscosity parameter can be dynamically changed by applying a magnetic field. The fluid transitions from a low-viscosity state during circulation to a high-viscosity state when the magnetic field is applied, creating selective pressure drops. This parameter change capability allows single-casing operations with controlled pressure profiles at different depths.
2Reliability
If multiple casing strings are used to manage pressure, then formation integrity can be maintained, but drilling efficiency decreases and operations become more complex
Solution Approach 1:
The magnetic assembly tool replaces multiple mechanical casing strings with a magnetic field-based pressure control system. The magnetorheological fluid, when activated by the magnetic field, creates selective pressure drops that maintain formation integrity without requiring intermediate casing strings, thereby improving drilling efficiency and reducing operational complexity.
Solution Approach 2:
The magnetorheological fluid acts as an intermediary between the magnetic field and the drilling fluid in the annulus. The magnetic field activates the fluid's rheological properties, creating a mediating effect that produces selective pressure drops to protect formation integrity while maintaining efficient single-casing operations.
3Force
If magnetic field is generated without shielding, then magnetic field can interact with magnetorheological fluid, but downstream flow inside the drill pipe is affected
Solution Approach 1:
The magnetic shielding creates a localized magnetic field environment outside the drill pipe while maintaining normal flow conditions inside. The shielding material is positioned to confine the magnetic field interaction to the annular region where the magnetorheological fluid is present, allowing the magnetic field to affect the fluid externally without interfering with the downstream flow inside the drill pipe.
Solution Approach 2:
The magnetic assembly tool segments the magnetic field interaction into distinct regions: the magnetic field is allowed to interact with the magnetorheological fluid in the annular region outside the drill pipe, while the magnetic shielding material prevents the field from penetrating into the drill pipe interior. This spatial segmentation enables selective magnetic field application without harmful interference.
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
This approach enables selective pressure control and rheology alteration, reducing the need for multiple casing strings, enhancing drilling efficiency, and preventing formation integrity loss during cementing operations by creating targeted pressure drops and viscosity changes.
Implementation Method 1
When the magnetic field interacts with a magnetorheological fluid outside the drill pipe or casing, the magnetorheological fluid creates flow restriction outside the drill pipe or the casing
Implementation Method 2
The magnetic shielding material shields the magnetic field from the downstream flow of the magnetorheological fluid inside the drill pipe or the casing
Implementation Method 3
The magnetic field generator can include at least one of a magnetostrictive material, a permanent magnet, or an electromagnet, among other components capable of creating a magnetic field
Data Source
AI summary
Aspects of magnetic gradient drilling are described. In one embodiment, a system includes a drill pipe, drilling fluid, and a magnetic assembly tool connected to or integrated with the drill pipe. Among other elements, the magnetic assembly tool can include a magnetic field generator configured to generate a magnetic field and create an additional pressure drop in the drilling fluid outside the drill pipe, and a magnetic shielding material configured to shield the magnetic field from inside the drill pipe.