Polycrystalline Diamond Cutter Plow Feature Wear Reduction
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Solution Overview
Problem
Conventional fixed-cutter drill bits experience wear and fracturing issues when engaging heterogeneous and nodular subterranean formations, leading to reduced drilling efficiency.
Innovation Solution
The integration of plow features on the cutting elements of drill bits, which are configured to crush or fracture the subterranean formation before other portions of the cutting face engage it, thereby reducing wear and extending the drill bit's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting face of the cutting element engages the subterranean formation, then drilling operation can proceed, but wear and fracturing occur leading to reduced operational life
Solution Approach 1:
The plow feature performs preliminary action by crushing and fracturing the subterranean formation before the cutting face engages it. This pre-processing of the formation material reduces the stress and impact on the cutting face during subsequent drilling operations, thereby reducing wear and extending the operational life of the cutting element while maintaining drilling productivity
2Productivity
If the cutting face engages heterogeneous and nodular formations, then drilling can continue, but fracturing and delamination of the cutting element occur
Solution Approach 1:
The plow feature performs preliminary crushing and fracturing of heterogeneous and nodular formations before the cutting face engages them. This pre-breakdown of tough formation materials reduces the shock loads and stress concentrations that cause fracturing and delamination of the cutting element, thereby maintaining drilling continuity while preserving cutting element structural integrity
Solution Approach 2:
The plow feature acts as an intermediary between the formation and the cutting face. It performs the initial breakdown of difficult formation materials, serving as a buffer that protects the cutting face from direct impact with heterogeneous and nodular formations, thus preventing structural failure while enabling continuous drilling
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 use of plow features on cutting elements reduces fracturing and delamination, leading to decreased wear and increased operational efficiency of the drill bit during drilling operations.
Implementation Method 1
The plow feature may crush or fracture the formation prior to the other portions of the cutting face and/or a cutting edge engaging the formation
Data Source
AI summary
A cutting element includes a substrate configured to couple to a pocket formed in a blade of a downhole drill bit and a polycrystalline diamond portion secured to the substrate. The polycrystalline diamond portion includes a cutting face, a radial sidewall, and a cutting edge formed at a transition from the radial sidewall to the axial the cutting face. The cutting face includes a plow feature disposed at a center of the cutting face. The plow feature has a face portion and a shoulder portion. The shoulder portion extends radially outward from the face portion and axially downward toward the substrate. Additionally, the cutting face includes a recessed portion extending between the cutting edge and a radially outer edge of the shoulder portion.