Refreshable PDC Drill Bit with Rotating Blade
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Solution Overview
Problem
The existing PDC drill bits require a time-consuming tripping process to change the bit due to low rate of penetration or formation changes, which can take approximately two days when the drill bit is at 12,000 feet total depth.
Innovation Solution
A refreshable PDC bit system with a translatable or rotatable refreshing blade that can be moved into a cutting position upon receiving a signal, allowing for the restoration of aggressiveness or adaptation to formation changes without removing the drill string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill bit is changed due to low rate of penetration or formation change, then the drilling performance can be improved, but the tripping process takes approximately two days which significantly increases the loss of time
Solution Approach 1:
The blade assembly is designed to be movable between a first position (engaged with formation for cutting) and a second position (retracted or rotated away). This dynamic positioning allows the cutting elements to be deployed only when needed, enabling rapid switching between drilling modes without removing the entire drill string, thus resolving the contradiction between maintaining drilling performance and minimizing tripping time.
Solution Approach 2:
The cutting elements are separated from the main drill string assembly and mounted on an independent movable blade assembly. This segmentation allows the cutting elements to be independently positioned and repositioned without affecting the stability of the drill string, enabling quick adaptation to formation changes while avoiding the time-consuming process of changing the entire drill bit.
2Loss of time
If the blade assembly is made movable to enable refreshing without tripping, then the loss of time is reduced, but the device complexity increases
Solution Approach 1:
The blade assembly incorporates self-contained cutting elements that can be automatically engaged and disengaged through the movable blade mechanism. The system serves itself by allowing the cutting elements to be deployed or retracted without requiring external intervention or complex control systems, thus reducing the overall device complexity while still enabling time-saving operations.
Solution Approach 2:
The movable blade assembly uses simple dynamic positioning mechanisms (such as movable mounts or rotation capabilities) that allow the cutting elements to be positioned for cutting or retracted for protection. These dynamic mechanisms are designed to be relatively simple in construction, balancing the need for operational flexibility with minimal added complexity.
Data Source
AI summary
A cutter system for a polycrystalline diamond compact (PDC) drill bit including a body, a static blade attached to the body, and a rotatable blade attached to the body. The cutter system further includes at least one PDC cutting structure attached to the rotatable blade. The rotatable blade is configured to be rotated and maintained in a rotated position. The body includes a cavity cooperatively positioned angularly away from the static blade. The rotatable blade rotates into the cavity. The rotatable blade has at least one incrementally rotated rest position. The cavity includes a restricting device within said cavity, so that said restricting device engages said rotatable blade member in the incrementally rotated position.