Fidelity Retaining Coring Device for Rock Samples
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Solution Overview
Problem
Current coring tools face challenges in maintaining the in-situ conditions of rock samples during drilling, struggling with hard rock extraction, slow blade cooling, rapid tool wear, and short service life, which affects the integrity and efficiency of rock core sampling.
Innovation Solution
A fidelity-retaining coring device comprising a rock core drilling tool with a two-stage drill bit, a core catcher with mechanical claws, and a fidelity-retaining cabin that maintains temperature and pressure conditions using liquid nitrogen and an energy accumulator, along with a graphene-coated inner barrel for reduced friction and a sealing mechanism to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coring tools are used to extract rock cores, then the core can be obtained, but the in-situ temperature and pressure conditions cannot be maintained during retrieval
Solution Approach 1:
The patent implements a nested structure where the core barrel is placed inside a fidelity-retaining cabin, which is in turn housed within the outer barrel. This multi-layer nesting allows the core to be protected in its original temperature and pressure environment throughout the retrieval process, solving the problem of maintaining in-situ conditions while obtaining the rock core sample.
Solution Approach 2:
The patent applies parameter changes by controlling the temperature and pressure parameters within the fidelity-retaining cabin. The cabin maintains constant temperature and pressure conditions that match the in-situ environment, preventing parameter changes that would otherwise occur during core retrieval and thus preserving sample integrity.
2Productivity
If conventional drill bits are used for hard rock coring, then drilling can proceed, but the blade cooling speed is slow and tool wear is rapid
Solution Approach 1:
The patent introduces a hydraulic cooling system that channels drilling fluid through channels in the drill bit to directly cool the cutting blades during drilling. This hydraulic cooling approach significantly improves blade cooling speed compared to conventional air cooling or natural convection, enabling sustained high-speed drilling while extending tool service life by preventing overheating and excessive wear.
3Adaptability or versatility
If conventional core catchers are used, then soft rock cores can be captured, but hard rock cores cannot be effectively taken
Solution Approach 1:
The patent employs dynamic core catcher claws that can change their configuration during operation. The claws are designed to be flexible and adaptable, allowing them to adjust their gripping force and orientation to effectively capture both soft and hard rock cores. This dynamic design enables the core catcher to handle various core types and hardness levels, significantly improving adaptability and capturing capability.
4Ease of operation
If the core storage chamber is exposed to surface conditions during equipment rise, then the core can be retrieved, but the environmental parameters (temperature and pressure) are reduced and in-situ conditions are lost
Solution Approach 1:
The patent extracts the core from the drilling environment and places it into a fidelity-retaining cabin that maintains the original in-situ pressure and temperature conditions. This extraction method allows the core to be retrieved from the wellbore while keeping it isolated in a controlled environment that preserves its original stress and temperature state, enabling both easy retrieval and condition maintenance.
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 device ensures the rock core maintains its in-situ conditions, enhances drilling speed and efficiency, extends tool life, and maintains sample integrity by automatic heating and cooling, and pressure regulation, while the graphene layer reduces friction and the mechanical claws securely capture hard rock cores.
Implementation Method 1
The upper end of the inner coring barrel is communicated with a liquid nitrogen storage tank, and the liquid nitrogen storage tank is located in the outer coring barrel
Implementation Method 2
liquid nitrogen storage tank
Implementation Method 3
the energy accumulator is communicated with the outer coring barrel
Implementation Method 4
The electric heater is used to heat the inside of the outer coring barrel
Implementation Method 5
a graphene layer reduces friction
Data Source
AI summary
A fidelity retaining type coring device for a rock sample, comprising a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity retaining cabin. The rock core drilling tool comprises a coring drilling tool, a core catcher (11), and an inner core pipe (12); the coring drilling tool comprises an outer core pipe (13) and a hollow drill bit (14), and the drill bit (14) is connected to the lower end of the outer core pipe (13); the lower end of the inner core pipe (12) extends to the bottom of the outer core pipe (13), and the inner core pipe (12) is in clearance fit with the outer core pipe (13); the rock core sample fidelity retaining cabin comprises an inner coring barrel (28), an outer coring barrel (26), and an energy accumulator (229); the outer coring barrel (26) is sleeved on the inner coring barrel (28); the upper end of the inner coring barrel (28) is communicated with a liquid nitrogen storage tank (225), and the liquid nitrogen storage tank (225) is located in the outer coring barrel (26); the energy accumulator (229) is communicated with the outer coring barrel (26); the outer coring barrel (26) is provided with a flap valve (23). According to the device, a rock core can maintain its state in an in-situ environment; in addition, the drilling speed can be increased, and the coring efficiency can be improved.