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Abstract

Having enjoyed considerable success With its high technology central Cormorant Underwater Manifold Centre, shell Expro has directed its attention towards simpler, low technical cost systems which can be applied to 'fast track' development of marginal prospects. One method of achieving theme objectives is to utilise Xmas tree manufacturing techniques and resources, to provide solid block forged manifolds with suitable bores and end outlets to facilitate connection of cluster wells and transport pipelines. This Shell Expro concept, involving assembly, rather than fabrication processess to Construct the manifold and requiring minimal land testing, was developed by Cameron Offshore Engineering, and has been adopted as the basis for the eleven Well Osprey Development.

In its original form, the concept was a stack up of solid block forgings serving as production, injection and pigging manifolds, mounted on a single base. However, as Shell Expro developed this approach, it was realised that significant operational advantages could be gained by separating the oil and water systems into two separate clusters, located within the span of a drilling installation vessels anchor pattern, but allowing (through repositioning of the rig within the some anchor pattern) concurrent sea bed operations to be carried out at each cluster.

Detailed design and manufacture of this system is now being undertaken by Cameron Iron Works for Shell Expro, with installation planned for spring and summer 1990. planned for spring and summer 1990. 2

Introduction

The challenge facing Shell Expro over the next ten years is to develop the smaller 'marginal' fields against the background of uncertainty over the oil price. The majority of these marginal fields lie within 20 Km of existing platforms and can be used to supplement the output of existing fields, as their reservoirs begin to deplete. Shall Expro's target has been the development of systems for exploiting marginal fields. where up to 15 wells could be required for both production and reservoir support. It was necessary for the system to be applicable to rapid development from conceptual design to implementation typically going from concept to first oil in less than two years. The systems are also required to maximise flexibility. This would allow the addition or deletion of wells from the development plan as understanding of the reservoir grew. This flexibility was to be achieved with minimal incremental cost above that of the well and associated wellhead equipment.

It is shell Expro's belief that in order to achieve their targets in terms of timing and resources the systems should be suited to single source Engineer, Procure and Construct contracts. This is particularly true for the major system components. The use of particularly true for the major system components. The use of field proven technology and minimal Research and Development were primary constraints implied by the approach. This approach has the primary constraints implied by the approach. This approach has the added advantage of requiring less shell Expro Engineering and Supervisory resources than more traditional contracting strategies. Shell Expro also recognised a need to standardise equipment to a much greater extent than has been the case to date.

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