American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc.

Abstract

A typical field application is defined, where the objective is to utilize a subsea production system to develop an offshore oilfield in an average water depth of 800 feet. Eight dually completed wells are required to achieve a production plateau of 25,000 BOPD. The SEAL production plateau of 25,000 BOPD. The SEAL Multiple-Well Manifold/Production Station was chosen for this application.

Introduction

Anticipation of offshore petroleum discoveries in profoundly deep water engendered the research and development of various subsea production systems over the past decade. Some production systems over the past decade. Some of them are now considered operational and available for practical application. One such system, pioneered by Mobil and completed by SEAL, is the Multiple-Well Manifold/ Production Station, which will be incorporated here Production Station, which will be incorporated here in the development of an example offshore oilfield.

This multiple-well station is intended for use where deviated drilling is possible from subsea locations, where wells may be drilled peripherally through a base template. The peripherally through a base template. The wells are then connected to a subsea work enclosure by use of wellhead connector assemblies. Functioning basically as a manifolding station, the subsea work enclosure provides a dry environment on the sea floor at atmospheric pressure, in which normal oilfield equipment may operate.

The example field under consideration lies offshore in 800 feet of water, about a mile from an existing platform. It contains two reservoirs that will be produced through dually completed wells to achieve a field production rate of 25,000 BOPD. The wells production rate of 25,000 BOPD. The wells are to be drilled by a floater rig, deviated through the drilling template that will serve as the base of the multiple-well station. Production will be manifolded on the seabed Production will be manifolded on the seabed through the subsea work enclosure and piped to the nearby platform for processing and transport to shore.

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