Hydraulic Core Drilling Rig Driving System with Stepless Speed Control
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Solution Overview
Problem
Current core drilling systems face challenges in efficiently drilling through high-temperature downhole environments with mechanical structures that require stepless speed control and minimal disturbance, especially in oilfield exploration where precise control and long-distance mud-driven drilling are necessary.
Innovation Solution
A driving system for a core drilling rig featuring a motor with an outer rotor and inner stator, a hydraulic pump, and a centralizer with copper centralizing blocks, which allows for high power and stepless speed change, along with a fluid channel activation module and flow diverging module to manage fluid flow and drill bit cooling, enabling efficient and controlled drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional motor structure is used, then the device complexity is reduced, but the ability to achieve stepless speed change and high power is compromised
Solution Approach 1:
The patent employs a hydraulic motor structure where a hydraulic pump delivers hydraulic oil to the motor, and the hydraulic oil acts on the outer rotor to generate rotational motion. This hydraulic mechanism enables stepless speed change and high power output while managing the complexity through fluid-based actuation rather than mechanical gear systems.
2Reliability
If mechanical structures are used to control drilling operations, then the system can operate in high-temperature downhole environments, but the precision and control capability are limited
Solution Approach 1:
The patent replaces conventional electrical control systems with a hydraulic control system. The hydraulic pump, driven by the engine, provides precise control of the drilling parameters through fluid pressure and flow regulation, enabling accurate control while operating in high-temperature environments where electrical equipment would fail.
3Power
If the outer rotor and inner stator are in clearance fit, then the motor can achieve high power and stepless speed change, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the clearance between the outer rotor and inner stator should be 0.05-0.15 times the diameter of the outer rotor. This parameter optimization allows the hydraulic motor to achieve high power output and stepless speed change while maintaining feasible manufacturing tolerances, balancing performance requirements with manufacturing capabilities.
4Duration of action of stationary object
If the centralizer with copper centralizing blocks is used, then the service life of drilling structures is extended by reducing friction, but the device complexity increases
Solution Approach 1:
The patent employs copper centralizing blocks within the centralizer structure. Copper material is selected for its low friction coefficient and good wear resistance, which reduces friction between the drilling assembly and the wellbore, thereby extending the service life of drilling structures. The composite design integrates these copper blocks into the centralizer framework to achieve both durability and functional requirements.
Data Source
AI summary
A driving system for a core drilling rig has a driving motor. The driving motor has an outer rotor and an inner stator, and 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. A clearance between the outer rotor and the inner stator is a driving liquid channel. The length of the outer rotor is less than that of the inner stator. The outer rotor is provided between the front and rear ends of the inner stator. The outer rotor is connected to an outer cylinder. The rear end of the inner stator is connected to a coupling.