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Automatic Detection of Resonance Frequency of a Downhole System

Inactive Publication Date: 2007-01-25
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0005] In general, a downhole system (e.g., an electrical submersible pump) can be run at plural frequencies, and a drive system controls an operating frequency of the downhole system. A controller controls the drive system to, in a test procedure, v

Problems solved by technology

Such manual testing of the electrical submersible pump is time-consuming and labor intensive, which increases the cost of deploying a completion into a well.

Method used

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  • Automatic Detection of Resonance Frequency of a Downhole System
  • Automatic Detection of Resonance Frequency of a Downhole System
  • Automatic Detection of Resonance Frequency of a Downhole System

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Embodiment Construction

[0009] In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible.

[0010] As used here, the terms “up” and “down”; “upper” and “lower”; “upwardly” and downwardly”; “upstream” and “downstream”; “above” and “below”; and other like terms indicating relative positions above or below a given point or element are used in this description to more clearly describe some embodiments of the invention. However, when applied to equipment and methods for use in wells that are deviated or horizontal, such terms may refer to a left to right, right to left, or other relationship as appropriate.

[0011]FIG. 1 illustrates a system that includes a string deployed in a wellbore 100, where the string has a pump assembly 102 that is carr...

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Abstract

A system includes a downhole tool adapted to be run at plural operating frequencies, a drive system to control an operating frequency of the downhole tool, and a controller to control the drive system to, in a test procedure, vary the operating frequency of the downhole tool. The controller automatically detects a resonance frequency of the downhole tool in the test procedure.

Description

BACKGROUND [0001] To produce hydrocarbons from a well, an artificial lift mechanism that utilizes a pump is sometimes used. One type of pump is an electrical submersible pump that can be operated at different frequencies. The electrical submersible pump can be controlled by a variable speed drive system that is able to vary the operational frequency of the electrical submersible pump. [0002] It is desired that the electrical submersible pump not be run at its resonance frequency, as excessive vibration may occur when the electrical submersible pump is run at the resonance frequency. The resonance frequency of an object is the natural frequency of vibration of the object, determined by the physical parameters of the object. [0003] Conventionally, to identify the resonance frequency of the electrical submersible pump, a manual procedure is performed. The manual procedure involves controlling the variable speed drive system (normally located at the earth surface) to perform a frequency...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B43/00
CPCE21B47/0007E21B47/008
Inventor KAYADARMA, MARDI E.
Owner SCHLUMBERGER TECH CORP
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