Submarine Wire-Line Coring Drill Rig Sediment Core-Drilling Process
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Solution Overview
Problem
Submarine wire-line coring drill rigs face challenges with hole collapse and difficulty in remote operation due to the lack of mud protection and the need for precise placement of drill pipes, which are not addressed by standard drilling procedures for land or offshore rigs.
Innovation Solution
A sediment core-drilling process for submarine wire-line coring drill rigs that uses a pressure-suction mode with a thin-walled annular cutting blade and a high-pressure seawater washing pump to minimize disturbance and ensure efficient core extraction, allowing for remote operation and safe drilling without mud lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If seawater is used as flushing liquid instead of mud, then the rig size and weight are reduced, but the hole wall protection ability deteriorates
Solution Approach 1:
The patent changes the physical parameters of the flushing liquid by using seawater instead of mud, and compensates for the reduced hole wall protection by adjusting drilling parameters (lower drilling speed of 20±2 mm/s, optimized pump flow rates) to minimize disturbance and maintain hole stability despite the lighter flushing medium
Solution Approach 2:
The patent uses excessive pump flow rates (50-80 L/min during cleaning, 100-150 L/min during punching) to compensate for the lack of mud protection, creating strong seawater flows that provide enhanced hole wall support and stabilization during the drilling process
2Device complexity
If seawater is used as flushing liquid, then the rig complexity is reduced, but the risk of hole collapse increases
Solution Approach 1:
The patent performs preliminary hole wall stabilization by maintaining continuous seawater flow through the drill pipe before and during the addition of new drill pipes or inner tubes, ensuring the hole remains stable and visible during remote operations before proceeding with equipment changes
Solution Approach 2:
The patent implements remote monitoring and feedback control where the operator on the mother ship receives real-time information about hole conditions and adjusts drilling parameters, pump flow rates, and seawater pressure to maintain hole stability and prevent collapse during automated drilling operations
3Productivity
If automated remote control is implemented, then the operation efficiency is improved, but the ability to perform artificial intervention deteriorates
Solution Approach 1:
The patent uses the seawater flow as an intermediary medium that transmits both drilling function and stabilization function, allowing automated control to maintain hole stability through regulated seawater flow while the operator can still intervene by adjusting pump parameters or initiating flushing operations remotely when needed
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 process achieves low disturbance and high efficiency in coring, enabling safe and reliable remote operation by maintaining hole stability and facilitating the recovery of sediment core samples with reduced risk of collapse.
Implementation Method 1
balancing the buoyancy of the drill rig by drawing seawater from the drill pipe into the seawater suction cylinder
Implementation Method 2
a water outlet of a high-pressure seawater washing pump is communicated with an inner hole of an active drill pipe
Data Source
AI summary
Disclosed is a sediment core-drilling process for a submarine wire-line coring drill rig, including 1) lowering the drill rig; 2) drilling in a pressure-suction mode; 3) drilling in a rotation-pressure-suction mode; 4) cutting sediment cores; 5) recovering a core inner tube; 6) cleaning bottom of hole; 7) punching before adding a drill pipe; 8) lowering another core inner tube; 9) adding the drill pipe; 10) punching after adding the drill pipe; 11) repeating the steps 2)-10) until a given hole depth is reached; 12) recovering the drill pipe and a wire-line coring outer tube drilling tool; 13) recovering the submarine wire-line coring drill rig. The core-drilling process provided herein is suited to working conditions without mud lubrication and mud protection for hole wall. This invention has advantages of low disturbance and high efficiency in coring and is suitable for remote operation.