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Virtual Prototyping Seabed Drilling and Penetration System

Author: GaoHouXiu
Tutor: LiBo
School: China University of Geosciences
Course: Mechanical Engineering
Keywords: cone penetration drilling virtual prototyping monitoring system controlling system
CLC: P744.4
Type: Master's thesis
Year: 2011
Downloads: 171
Quote: 1
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Abstract

Marine resources are getting more and more attention as the land resources are becoming exhausted. Exploration of marine resource is restricted by the development of marine drilling and penetration system. The marine drilling and penetration system, established on the base of basic theories and applied technologies, is a complex electro hydraulic mechanical system with sets of high level and high precision techniques. Remote monitoring technology should be applied in the seabed drilling system to help monitoring undersea machine working statues on mother ship. With much more complex working conditions, as well as unresolved technologies and insufficient basic theories, seabed drilling system could drill less depth with worse functional composite compared with on land drilling systems.Two main factors should be taken into consideration in the marine drilling and penetration system. First, mechanical actions needed by the drilling and penetration procedure. Second, the executive bodies designed for the mechanical actions. Techniques including mechanisms, static mechanical and machine kinematics should be used in the designing of the mechanical system. The research of marine drilling and penetration system can be divided into two parts:1. system status monitoring; 2. working parameters adjustment according to the status.In this paper, seabed drilling and penetration system used to the seabed core samples and cone penetration penetration will be introduced.Targets including the calculation and designing of specifications of RCCDS, overall structure, laying & recovery methods, self recovering scheme, electro hydraulic system, power system, controlling system, leveling system, working modes converting, library structure, drilling and pushing system should be reached.3D modes should be established in Solidworks.Main designing include:1. A double-wall output shaft power head, with compact and simple structure, solves the problems of orifice step aside action in the process of wire line coring. The sampler could be stored inside the output shaft. It will make the controlling and automation of undersea drilling easier; it would also improve efficiency, save time, and lower the cost as well.2. The outline of the drill library is rectangle for a bigger storage volume. Adjustable rectangle library can hold drill pipes of different diameters. V-groove blessing manipulator with rubber friction plate on its surface is applied on the mechanical arms to increase the friction coefficient, and protect the mechanical arms as well.3. Leveling system is designed according to the technology needs of RCCDS. Three-way bearing mode is applied in the leveling system considering the reliability and cost. In the tree-way bearing mode, problems including statically indeterminate can be avoided. The highest point chasing method, which makes the system fast and steady, is used in the controlling of the leveling system.4. Reliable and simple-structural diameter-adjustable clamp with changing diameter outline for different drill pipes is designed.Mechanical bodies’motion possibility and certainty is calculated by the structural analysis of mechanisms and motion analysis on the base of mathematical modes. Static analysis is done using ANSYS and Solidworks Simulation. Dynamic analysis is done using the ADAMS. All these works construct a foundation of optimization of mechanical system.Controlling and monitoring software system is accomplished in the LabVIEW 2010. multiple parameters of working status, including motor speed, line pressure, drilling pressure, fluid flow, drilling pipe speed and torque, can be monitored in this system. In this paper, speed, inclination, torque, drilling pressure, pump pressure, fluid flow, and pump output is measured real-time. Sensors are connected by the SCB-68 connector to the DAQ equipment. Differential connections method is used in the system to lower the signal noise.Frequently experiments is not cost efficient for the complexity and high cost of the seabed drilling and penetration system. In this situation, scale model is used in the experiments.The functional designing and structural designing of seabed drilling and penetration system is done on the base of mechanisms research and dynamic research. Virtual designing, testing and evaluating of the system is done in the computer environment to accomplish the forecasting and finalizing of load and size of the system and parts, aiming at a better overall performance of the system.Innovations of this paper include:1. Innovative structural designing according to the technical needs of seabed drilling & penetration.2. Functional integration of high-depth undersea drilling and cone penetration.3. This paper provides solutions for seabed drilling with drilling capacity of 200 meters for working depth of 3000 meters.This paper provides solutions for high-depth seabed core sampling. It lays foundation for the searching and development of marine resources.

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