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Abstract

At the present tine there are around 400 subsea completions worldwide and even the most conservative surveys predict a doubling of this number within the next decade.

This paper discusses the evolution and operation of a flexible, self-contained system which makes optimum use of existing technology hereby offering a safe, reliable and economical system for riserless re-entry into any subsea well.

Introduction

The traditional method of re-entering a subsea well with wireline involves the use of a drilling rig and a hard riser. The method discussed in this paper enables operators to adopt a flexible approach towards well design in the knowledge that wireline re-entry, whether to change the status of the well or for data acquisition purposes, can now be readily and safely achieved at a reasonable cost since neither a drilling rig nor a hard riser are required.

Me system provides the capability of ruining a comprehensive range of slickline and conductor line equipment using proven components and a design philosophy which centres on maximum flexibility thereby allowing deployment from a wide range of vessels.

3. SUBSEA WIRELINE SYSTEM - GENERAL DESCRIPTION

The current subsea wireline system has been developed from the prototype system used by a major North Sea operator on a live North Sea well during June, 1986.

The system maximises the use of readily available existing equipment and standard, tried and proven practice. It allows a complete range of slickline and electric line downhole operations on subsea wells, including fishing to be carried out from relatively small monohull vessels as well as from semi-submersibles of any size.

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