Hydraulic Coring Drill Driving Structure for High-Speed Drilling
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Solution Overview
Problem
Existing core drilling tools experience slow drilling speeds and low core efficiency due to high downhole temperatures and mechanical limitations, making it difficult to effectively extract rock cores for oil and gas reservoir studies.
Innovation Solution
A driving structure for a core drilling tool featuring a motor with an outer rotor and inner stator, a hydraulic pump, and a centralizer with copper blocks, allowing for long-distance mud-driven drilling with high efficiency and stepless speed control, along with a two-stage drill bit design for enhanced drilling speed and reduced formation disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mechanical drilling structures are used, then the device is simple and reliable, but the drilling speed is slow and core efficiency is low
Solution Approach 1:
The patent replaces traditional mechanical transmission systems with a hydraulic driving system. The hydraulic motor converts hydraulic energy from the drilling fluid into rotational motion, eliminating complex mechanical gears and transmissions. This substitution enables higher drilling speeds while maintaining system reliability through the simplicity of hydraulic components.
Solution Approach 2:
The patent employs a hydraulic driving structure where drilling fluid powers a hydraulic motor to rotate the drill bit. The hydraulic system provides continuous variable speed control and high torque output, directly addressing the slow drilling speed issue without requiring complex mechanical speed reduction mechanisms.
2Temperature
If high downhole temperature conditions are endured, then electrical equipment cannot be used, but mechanical structures suffer from high temperature limitations
Solution Approach 1:
The patent uses a hydraulic driving system that operates using drilling fluid under pressure, eliminating the need for electrical motors that cannot function in high-temperature downhole environments. The hydraulic components are designed to tolerate high temperatures while maintaining reliable operation throughout the drilling process.
3Productivity
If single-stage drill bit is used, then the structure is simple, but drilling speed is slow and formation disturbance is high
Solution Approach 1:
The patent divides the drill bit into two distinct stages: a cutting stage with hard alloy cutters for breaking rock, and a reaming stage for smoothing and enlarging the hole. This segmentation allows each stage to perform its specific function optimally, increasing overall drilling speed while reducing formation disturbance through the gentler reaming action of the second stage.
4Productivity
If long-distance mud-driven drilling is implemented, then high efficiency and stepless speed control are achieved, but the driving structure becomes more complex
Solution Approach 1:
The patent replaces complex mechanical transmission systems with a hydraulic driving system that enables long-distance power transmission through the drilling fluid. The hydraulic motor provides stepless speed control and high efficiency, and the overall structure is simplified compared to traditional mechanical systems with multiple gears and shafts.
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 solution enables high-power, stepless speed control and improved drilling efficiency, reducing formation disturbance and ensuring the integrity and quality of extracted cores, while the two-stage drill bit design enhances drilling speed and core quality.
Implementation Method 1
long-distance mud-driven drilling with high efficiency and stepless speed control
Implementation Method 2
mutually-matched convex ribs are provided on the inner wall of the outer rotor and the outer wall of the inner stator. The outer rotor and the inner stator are in clearance fit.
Implementation Method 3
a centralizer with copper blocks, allowing for long-distance mud-driven drilling with high efficiency
Data Source
AI summary
A coring drill tool driving structure has a driving motor (7), an outer cylinder (23) and a coring drill tool (8). The driving motor comprises an outer rotor (73) and an inner stator (75), the inner wall of the outer rotor and the outer wall of the inner stator are provided with ribs (77) mutually matched, the outer rotor and inner stator are in clearance fit, the clearance between the outer rotor and the inner stator is a driving liquid flow path (74), the outer rotor length is smaller than the inner stator length, the outer rotor is located between front and rear ends of the inner stator, the outer rotor is connected to the outer cylinder, a front end of the outer cylinder is connected to the coring drill tool, and a rear end of the inner stator is connected to a coupling (76).