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Distributed Pumping System for Transporting Well Streams from Wellhead to Topsides

IP.com Disclosure Number: IPCOM000247550D
Publication Date: 2016-Sep-15
Document File: 2 page(s) / 24K

Publishing Venue

The IP.com Prior Art Database

Abstract

This proposed method is to meet the boosting requirements in a cost-effective manner for subsea oil and gas fields at an increasing water depth up to 4,500 meters. This method comprises a distributed pumping system along a riser to boost and transport full well stream or separated hydrocarbons from seabed to topsides.

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Distributed Pumping System for Transporting Well Streams from Wellhead to Topsides

Abstract

This proposed method is to meet the boosting requirements in a cost-effective manner for subsea oil and gas fields at an increasing water depth up to 4,500 meters. This method comprises a distributed pumping system along a riser to boost and transport full well stream or separated hydrocarbons from seabed to topsides. 

Description of the Problem to be Solved

Oil and gas industry is approaching frontier waters with a depth up to 4,500 m with an increasing requirement for subsea boosting to transport from seabed to topsides the full well stream or hydrocarbons separated at seabed. Subsea pumps have been developed by multiple companies and applied in fields for boosting purpose. Deeper waters yields higher ambient hydrostatic pressure and higher head across the water column, and consequently poses challenges in pump design, installation and maintenance.  When stepping to deeper waters, subsea pumps may become larger with more power consumption and higher cost for installation and retrieval. In some brown fields, subsea pumps might be also needed for recovery improvement or field extension. Use of subsea pumps in an existing field may be constrained by a considerable amount of cost and needs for modifying existing topsides and subsea layouts. Therefore, there is a need to develop an innovative pumping approach for boosting in deep and frontier waters in a cost effective manner.

Description of Proposed Method

The proposed method is for a distributed pumping system along a riser from seabed to topsides as shown in the right plot of Figure 1. As a comparison, the left side of Figure 1 shows a conventional pumpi...