Continuous Sampling Drill Bit with Integrated Core Slot
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Solution Overview
Problem
Conventional core sampling requires complex wireline tooling and is time-consuming, and existing continuous sampling methods are limited to dry formations and have high energy consumption.
Innovation Solution
A drill bit design with a core-receiving slot and peripheral slots, combined with face channels and a breaking surface, allows for continuous sampling by collecting core segments and cuttings while drilling, using reverse circulation without the need for wireline tooling, suitable for both water-bearing and non-water-bearing formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireline core sampling is used, then core samples can be retrieved, but the process is time-consuming and requires complex wireline tooling
Solution Approach 1:
The invention extracts and eliminates the complex wireline tooling system from the core sampling process. By using a simple drill bit with a core-receiving slot that collects samples during drilling, the patent removes the need for separate wireline retrieval operations, thereby increasing productivity and reducing device complexity
Solution Approach 2:
The invention merges the drilling and sampling operations into a single continuous process. The drill bit integrates both cutting functions and core sample collection in one tool, eliminating the need for separate wireline retrieval operations and achieving simultaneous drilling and sampling
2Productivity
If conventional core sampling is used, then formation samples can be collected, but it requires stopping drilling to separate and retrieve samples
Solution Approach 1:
The invention enables continuous sampling throughout the drilling process. The core-receiving slot continuously collects formation samples as the drill bit advances, eliminating interruptions for sample retrieval and maintaining continuous drilling operations
Solution Approach 2:
The drill bit is pre-configured with a core-receiving slot that automatically captures samples during drilling. This preliminary setup eliminates the need for subsequent stopping and retrieval operations, as samples are collected in advance during the drilling process itself
3Productivity
If percussive pneumatic hammers are used for continuous sampling, then sampling can continue without stopping, but energy consumption is high and they are limited to non-water-bearing formations
Solution Approach 1:
The invention replaces the energy-intensive pneumatic hammer system with a simpler mechanical drill bit design. The core sampling is achieved through the drill bit's cutting action and core-receiving slot geometry, eliminating the need for high-energy pneumatic percussion while maintaining continuous sampling capability
Solution Approach 2:
The invention changes the operating parameters by eliminating the need for air circulation and pneumatic pressure. The drill bit operates effectively in water-bearing formations by using fluid circulation through the drill string, expanding the applicable formation types while reducing energy requirements
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
Enables efficient and rapid sampling of formation samples, allowing for real-time collection and analysis while drilling, reducing operational complexity and energy consumption.
Implementation Method 1
The at least one face channel can be configured to deliver fluid from the at least one peripheral slot to the core-receiving slot
Implementation Method 2
A base portion can be positioned within the core-receiving slot. The base portion can define a breaking surface. At least a portion of the breaking surface, or a plane tangential thereto, can be oriented at an oblique angle to the central axis
Implementation Method 3
The at least one peripheral slot can be configured to receive fluid moving in a distal direction toward the cutting face of the crown
Data Source
AI summary
A drill bit having a central axis can comprise a shank defining an inner bore and a crown having a cutting face. The crown can define an outer operative circumference. The crown can comprise a core-receiving slot in communication with the inner bore of the shank. One or more peripheral slots can be in communication with the inner bore of the shank. The crown can comprise one or more face channels that are in communication with the core-receiving slot and a respective peripheral slot. A base portion can be positioned within the core-receiving slot. The base portion can define a breaking surface. The peripheral slots can be configured to receive fluid moving in a distal direction toward the cutting face of the crown. The face channels can be configured to deliver fluid from the respective peripheral slot to the core-receiving slot.