Electrical Submersible Pump

7801 Words May 18th, 2011 32 Pages
Electrical Submersible Pump Analysis and Design
May 30, 2001

Electrical Submersible Pump Analysis and Design

Case Services, Inc.

Abstract
Case Services’ software provides production optimization for a variety of different methods of artificial lift. This paper discusses the dominant factors in electrical centrifugal submersible pump design and monitoring. Emphasis is placed on three areas: • • • Well inflow performance behavior. Fluid Pressure-Volume-Temperature and phase behavior. Pump equipment performance specifications.

An examination of fluid dynamics within a centrifugal pump provides appreciation for the need to analyze the pump “one stage at a time.” The importance of individual pump testing is also identified. This paper
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In addition, it is crucial to analyze pump performance based on a “known good” condition. Experience has shown that each serialized pump demonstrates unique performance data. Therefore, a factory pump test should be obtained before the pump is installed in a well. The data from this test can be used throughout the equipment life for accurate performance analysis. This discussion is limited to conventional applications of centrifugal pumps – specifically excluding: • • • Pumps installed below the producing formation. Downhole gas separation. Variable frequency drive considerations.

Focus is placed upon the pump itself. The downhole motor is discussed only in passing. Steady-state operation (no pump cycling) is also assumed.

05/30/01

Page 2

Electrical Submersible Pump Analysis and Design

Case Services, Inc.

The Basics
This section describes the formulas that are the basis for the csSubmersible suite’s calculations. When employing any pumping method, optimum artificial lift is achieved only when the pump is closely matched to the well’s ability to produce fluids. This is especially true with centrifugal pumping. Before the pump design process can even begin, an accurate model of the well’s inflow performance must be developed.

How Much Will It Make?
Figure 1 is a rough depiction of the way a producing formation might respond to wellbore pressure.

Flow Rate into Wellbore (STB/D)

1400 1200 1000 800

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