Pulsed-Power Drill Bit Ground Ring Segmentation
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Solution Overview
Problem
Pulsed-power drilling technologies face challenges in efficiently penetrating and removing rock formations due to physical hang-ups and inadequate rock cutting capabilities, particularly in wellbore environments where mechanical rock cutting features are limited.
Innovation Solution
The enhancement of a pulsed-power drill bit with a ground ring featuring hardened, mechanical rock cutting features, including a composite material with reinforcement and machinable components, to facilitate efficient rock fracture and removal, combined with a design that manages the electric field for effective arc formation and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground ring is made entirely of composite material with reinforcement for abrasion resistance, then the downhole life and rock cutting capability are improved, but the machining difficulty increases and manufacturing complexity worsens
Solution Approach 1:
The ground ring is divided into two distinct portions: a first portion made of composite material with reinforcement for abrasion resistance and rock cutting, and a second portion made of machinable material for ease of manufacturing and structural support. This segmentation allows each portion to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different portions of the ground ring are assigned different material properties: the first portion (distal end) has high abrasion resistance for rock cutting, while the second portion (proximal end) has good machinability for manufacturing and assembly. This local differentiation of material quality resolves the contradiction between durability and manufacturability.
2Productivity
If the ground ring uses hardened composite material for rock cutting, then the rock fracture capability is improved, but the device complexity increases due to multiple material components
Solution Approach 1:
The ground ring incorporates a composite material structure where a reinforcement material (such as diamond-impregnated material or carbide particles) is embedded within a binder material matrix. This composite construction provides both the hardness needed for rock cutting and the structural integrity required for withstanding downhole conditions, achieving high productivity without excessive complexity.
3Productivity
If the ground ring is designed with enhanced mechanical rock cutting features, then the ability to remove unfractured rock is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By segmenting the ground ring into a machinable portion and a composite reinforcement portion, the patent enables precise manufacturing of geometric features (such as fluid flow paths, mounting interfaces, and external dimensions) in the machinable material, while the composite portion provides the hardened cutting functionality. This reduces the precision requirements for forming complex features in the abrasive material itself.
Data Source
AI summary
A drill bit for downhole pulsed-power drilling is disclosed. A pulse-power drill bit may include a bit body; an electrode coupled to a power source and the bit body; a ground ring coupled to the bit body, the electrode and the ground ring positioned such that an electric field produced by a voltage applied between the ground ring and the electrode is enhanced at a portion of the ground ring proximate to the ground ring; a reinforcement material forming portions of the ground ring; a binder material infiltrated through the reinforcement material to form a composite material and forming a first portion of the ground ring; and an machinable material forming a second portion of the ground ring, wherein the composite material has a first resistance to abrasion greater than a second resistance to abrasion of the machinable material.