Pulsed Power Drilling Fluid Segmentation for Arc Formation
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Solution Overview
Problem
Pulsed power drilling with water-based drilling fluids faces challenges in creating electrical arcs through rock due to high conductivity, which limits efficient rock removal, and existing oil-based fluids are difficult to formulate with suitable dielectric properties for drilling while maintaining other fluid properties.
Innovation Solution
The use of two different types of drilling fluids, where a high-dielectric fluid is used proximate to the drill bit for arcing and a bulk drilling fluid with different properties is used for circulation, allowing for efficient rock removal by separating the critical dielectric element from the bulk fluid, enabling deeper drilling in challenging formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-based drilling fluid is used, then circulation and cuttings removal are improved, but electrical arc formation through rock is hindered due to high conductivity
Solution Approach 1:
The drilling fluid system is segmented into two distinct components: a water-based bulk drilling fluid for circulation and cuttings removal, and a dielectric fluid (such as nitrogen gas or hydrocarbon) introduced proximate to the drill bit for electrical arc formation. This segmentation allows each fluid to perform its specialized function without compromising the other.
Solution Approach 2:
Different fluid properties are applied at different locations: water-based fluid with high conductivity is used in the bulk circulation system, while a dielectric fluid with low conductivity is introduced locally at the drill bit face where electrical arcs are required. This local quality differentiation resolves the contradiction between circulation efficiency and arc formation.
2Reliability
If oil-based drilling fluid is used, then dielectric properties for arcing are improved, but formulation complexity and cost increase
Solution Approach 1:
The dielectric properties necessary for electrical arcing are extracted from the bulk oil-based drilling fluid and concentrated in a separate dielectric fluid component introduced only proximate to the drill bit. This allows the bulk fluid to remain a simple, cost-effective water-based formulation while the arc-forming function is handled by a specialized dielectric fluid such as nitrogen gas or hydrocarbon.
3Productivity
If high-dielectric fluid is used proximate to drill bit, then rock removal efficiency is improved, but fluid management complexity increases
Solution Approach 1:
The dielectric fluid system is nested within the existing water-based drilling fluid circulation system. The dielectric fluid is introduced through the drill string or annulus and mixes with or displaces the water-based fluid only in the immediate vicinity of the drill bit, while the bulk circulation system remains unchanged. This nested approach minimizes fluid management complexity.
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 more efficient drilling by ensuring the electric field is driven into the rock, improving rock removal efficiency and allowing drilling in previously inaccessible areas, while also reducing costs and environmental impact.
Implementation Method 1
Pulsed power technology may repeatedly apply a high electric potential across the electrodes of a drill bit, which ultimately causes the surrounding rock to fracture
Implementation Method 2
a high-dielectric fluid is used proximate to the drill bit for arcing
Data Source
AI summary
An apparatus, that is part of a drill string for drilling a wellbore in a subsurface formation, comprises a drill bit that includes at least one electrode coupled to a power source, the at least one electrode to periodically emit an electrical discharge based on electrical pulses received from the power source; and a first port to output a first type of drilling fluid having a different composition than a second type of drilling fluid to flow downhole for removal of cuttings, wherein the electrical discharge is to be transmitted through the first type of drilling fluid and through a rock of the subsurface formation.