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Forschungsstelle
EU FRP
Projektnummer
00.0060-2
Projekttitel
PDT-COIL: Research and development of an intelligent power and data transmission composite coiled tubing for the exploration of hydrocarbons
Projekttitel Englisch
PDT-COIL: Research and development of an intelligent power and data transmission composite coiled tubing for the exploration of hydrocarbons

Texte zu diesem Projekt

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Forschungsprogramme
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Kurzbeschreibung
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Partner und Internationale Organisationen
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Abstract
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Datenbankreferenzen
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Erfasste Texte


KategorieText
Schlüsselwörter
(Englisch)
Oil drilling; coiled tubing; electric power transport
Alternative Projektnummern
(Englisch)
EU project number: ENK6-2000-00074
Forschungsprogramme
(Englisch)
EU-programme: 5. Frame Research Programme - 1.4b.2 Economic and efficient energy for a competitive Europe
Kurzbeschreibung
(Englisch)
See abstract
Partner und Internationale Organisationen
(Englisch)
Coordinator: Shell International Exploration and Production B.V (NL)
Abstract
(Englisch)
The goal of the project is the assessment of the properties and capabilities of flexible tubing with integral electric power and signal transmission for sub sea oil and gas exploration (details see first year report). The first phase of the project (feasibility study, duration 2 years) was extended to 30 months (end: 28.02.2003). The second phase of the project (demonstration phase) has been approved by the EU-commission. This phase has already been started (01.01.2003) with duration of 22 months. The aim of the demonstration phase is to show the capabilities of the PDT-COIL in a field test, where a well will be drilled with a short section of the developed tube.
This report covers the second year of PDT-COIL phase 1 (feasibility study).
The research on the feasibility of the electrical part, which is in the responsibility of ETHZ, has been subdivided in two parts:
- Computer modelling of the electrical system (frequency converter - PDT-COIL - drilling motor) with special focus on transient over voltages and electric losses
- Research into suitable insulation materials and their properties in service, together with the design and test of a flat shielded electrical conductor for integration into a tube wall
In order to determine the specification for the electrical insulation together with the current capacity of the conductor and the electrical shield, a simulation of the entire electrical system (frequency-converter - PDT-COIL - drilling-motor) is necessary. Changes in the surge impedance at discontinuities of the electrical insulation system (connector- and motor-interface, etc), transients and harmonics of the frequency converter and induced voltages due to rotor vibration of the drilling-motor lead to transient over voltages and resonances on the PDT-COIL string. Detailed system simulation showed that the occurrence and the amplitude of the over voltages are highly dependent on the frequency-converter topology and its waveform-generation algorithm. With a detailed knowledge of the frequency-converter circuit together with a specific electrical parameter-set of the drilling-motor and the PDT-Coil, a simulation tool can be built for predicting and avoiding over voltages caused by resonances. As a conclusion, a project-partner providing a specific drilling motor and frequency-converter has to be found in order to derive specific input parameters for the system simulation.

In order to optimise the functionality of the electrical and the mechanical system, and to overcome the problem of liquid penetration into the electrical insulation layer, a separation of the functional parts of the electrical and mechanical system was implemented. A completely electrically and chemically shielded insulation system for integration into a tube wall was proposed and applied for patent (EU-patent application No 02 008 817.5-2208, submitted on the 19th of April 2002). First samples with different insulation materials have been produced. Field-steering cones for testing purposes and for the PDT-COIL connector have been designed; cones on test samples have been implemented. To test the insulation system under down-hole conditions an autoclave (1000 bar at 200°C) has been built. First tests with the new solution under ambient conditions show a good liquid sealing performance. To qualify the different insulation materials and chemical protection layers a set of electrical, mechanical and chemical tests (single or combined) will be carried out until the end of project phase 1 (February 2003).
Datenbankreferenzen
(Englisch)
Swiss Database: Euro-DB of the
State Secretariat for Education and Research
Hallwylstrasse 4
CH-3003 Berne, Switzerland
Tel. +41 31 322 74 82
Swiss Project-Number: 00.0060-2