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Title: An update on subsea multiphase pumping

Agip SpA anticipates that subsea multiphase production, based on long-distance transportation of untreated oilwell fluids--namely, oil, water, and gas, will be an efficient tool for the exploitation of deepwater and marginal fields. In 1990, at the Trecate onshore oil field, Agip completed long-term testing of a multiphase screw pump, which confirmed commercial surface applications. Agip then integrated a subsea version of an improved multiphase twin-screw pump into a subsea multiphase boosting unit that was installed at the Prezioso field, offshore Sicily, in 1994 That was the first subsea installation of an electrically driven multi-phase pump operating with live oil. Agip began endurance testing of the pumping system in January 1995 and by last November, the cumulated period of running reached 3,500 hours with no evidence of pump-capacity reduction. Testing focused on boosting at high gas-void fraction and oil viscosity, operation at variable motor speed for pump control, pump control by means of throttling valves, direct interaction of the pumping system with both wells and the multiphase export line, variation of the lube-oil pressure across seals and bearings, and the evaluation of any degradation effect on the pump flow capacity over time. This paper reviews the design and performance of thismore » pump and applicability to other offshore projects.« less
Authors:
;
Publication Date:
OSTI Identifier:
205533
Resource Type:
Journal Article
Resource Relation:
Journal Name: JPT, Journal of Petroleum Technology; Journal Volume: 48; Journal Issue: 2; Other Information: PBD: Feb 1996
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; PUMPS; DESIGN; PERFORMANCE; OIL WELLS; MULTIPHASE FLOW; NATURAL GAS WELLS; SICILY; OFFSHORE OPERATIONS; OPERATION