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Modular Floating Production System

IP.com Disclosure Number: IPCOM000234923D
Publication Date: 2014-Feb-14
Document File: 6 page(s) / 581K

Publishing Venue

The IP.com Prior Art Database

Abstract

The concepts described here provide means to change oil and gas processing equipment (separation, compression, power generation, injection, export, etc.) on floating production systems over the life of an oil and gas field. Three embodiments are discussed: • Float-on Float-off Modules • End-to-end Modules • Swap-out Modules

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Modular Floating Production System

Abstract

The concepts described here provide means to change oil and gas processing equipment (separation, compression, power generation, injection, export, etc.) on floating production systems over the life of an oil and gas field.  Three embodiments are discussed:

·         Float-on Float-off Modules

·         End-to-end Modules

·         Swap-out Modules

Problem

The characteristics of oil and gas field characteristics change as they are produced over time.  Elements that can change include, but are not limited to:

·         Pressures;

·         fluids [oil, gas, water];

·         production rates;

·         injection of gas or water for improved oil recovery; and/or

·         injection of chemicals for enhanced oil recovery.

The types, size, and weight of process facilities (separation, compression, power generation, water treatment, injection, export, etc.) required change in time in response to the varying characteristics. 

Figure 1 shows conceptually how the number of gas compressors might be changed to improve recovery in a naturally depleting gas field.

Figure 1 – Effect of Gas Compression on Pipeline Inlet Pressure in a naturally-declining gas field

A similar graph could be developed to show the need for increased water treatment facilities as an oil field waters out over time.

Pre-investing in facilities that are not needed for many years may be detrimental to project economics, but is often done because the costs of modifying offshore facilities is high compared to the cost of their construction on shore.

There are cases where the ability to cost-effectively change out process equipment, such as process modules, may improve economics compared to either pre-investment or offshore modification. 

Concepts

The concept proposes three embodiments of means for enabling the use of modular oil and gas processing facility modules on Floating Production Systems offshore:

·         Float-on Float-off Modules;

·         End-to-end Modules; and

·         Swap-out Modules.

The specific descriptions and pictures shown are not meant to limit the concept.  For example, other hull configurations than barges (such as semisubmersibles) could be used for some embodiments.

 


Float-on Float-off Modules

This embodiment (Figure 2) enables modular processing equipment by using a core barge unit with;

·         a central spine into which the process modules can be connected; and

·         ledges where barge-based processing modules can be placed.

The process modules could be installed and removed as needed by ballasting down the core barge unit, floating on a process module barge, and deballasting the core barge unit back to operating draft.  Each process module would be connected to the core barge unit along the central spine.  The core barge unit could be turret moored or spread moored, depending on the wind and wave conditions at the site.

Figure 2 – Float-on Float-off Modules

The shipping industry has built cargo ships that carry barges as cargo.  LASH (Lighter Aboard Ship) and See Bee are trade name...