Drill Pipe Threaded-Joint Wear Testing in Turbid Seafloor Water
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Solution Overview
Problem
Existing testing devices fail to effectively simulate the frictional wear behaviors of threaded joints of drill pipes under turbid seafloor conditions, leading to accelerated wear and reduced reliability due to sediment attachment, and lack models that consider complex stress conditions.
Innovation Solution
A testing device with a simple structure that simulates turbid seafloor conditions by stirring seabed sediments with rectangular blade sets, using a torque limiter to control torque transmission, and incorporating sensors to measure displacement, rotating speed, and turbidity, allowing for accurate simulation of frictional wear behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing testing devices are used, then the structure is simple, but the frictional wear behavior of threaded joints under turbid seafloor conditions cannot be effectively simulated
Solution Approach 1:
The patent changes the environmental parameters by introducing turbid seawater with suspended sediments into the testing device, transforming the testing environment from clear water to turbid conditions that match actual seafloor operations. This enables accurate simulation of frictional wear under real operating conditions.
Solution Approach 2:
The patent introduces an intermediary testing device specifically designed for threaded joint frictional wear testing in turbid environments. This specialized device acts as a mediator between the complex seafloor conditions and the testing requirements, enabling reliable simulation of wear behaviors that previous generic testing devices could not capture.
2Reliability
If sediment attachment is present, then the frictional wear is accelerated, but the service life of the drill pipe is shortened
Solution Approach 1:
The patent incorporates sensors to monitor friction force, wear depth, and sediment concentration in real-time during the testing process. This feedback mechanism allows continuous observation of how sediment attachment affects frictional wear and enables analysis of the relationship between sediment presence and service life reduction.
Solution Approach 2:
The patent performs preliminary testing of threaded joints in controlled turbid environments before actual seafloor operations. By conducting these tests in advance with sediment-laden water, the device can predict wear patterns and service life reduction, allowing for preventive maintenance strategies.
3Reliability
If complex stress conditions are considered, then the simulation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent divides the complex testing system into modular components: a testing chamber for threaded joints, a separate turbid seawater generation system with sediment suspension, and individual sensor modules for measuring friction, wear, and environmental parameters. This segmentation allows each component to be optimized independently while working together to simulate complex stress conditions.
Solution Approach 2:
The patent designs the testing device to perform multiple functions: it can test different types of threaded joints, simulate various sediment concentrations, apply different loading conditions, and monitor multiple parameters simultaneously. This multi-functionality reduces the need for multiple separate devices while maintaining high simulation accuracy for complex stress conditions.
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
Facilitates the exploration of tribological performance and frictional wear mechanisms of drill pipe threaded joints, improving the efficiency and reliability of deep-sea drilling equipment by accurately simulating the makeup and breakout of threaded joints in turbid seawater environments.
Implementation Method 1
stirring seabed sediments with rectangular blade sets
Implementation Method 2
using a torque limiter to control torque transmission
Implementation Method 3
frictional wear behaviors
Implementation Method 4
frictional wear mechanisms
Data Source
AI summary
A testing device for simulating frictional wear behaviors of threaded joints of a drill pipe under turbid seafloor environment, including a support, an oil cylinder, upper and lower specimens, a first motor, several second motors, stirring rods, a turbidity sensor, and a test tank. The oil cylinder and test tank are arranged on the support. A piston rod of the oil cylinder is connected to the first motor. A rotating-speed sensor is arranged on a bottom surface of the first motor, facing toward an output shaft of the first motor. The output shaft of the first motor is connected to an upper end of a torque limiter. A lower end of the upper specimen fits an upper end of the lower specimen under loading of a main shaft of the first motor. The stirring rods are provided at two sides of the test tank.