Downhole load sharing motor assembly

Abstract

A motor assembly of multiple motors for use in driving a shared downhole load within a well. In particular, the assembly may employ substantially constant adjustable speed motors. These may include permanent magnet synchronous machine motors. The motors may be configured to operate at given speeds that may be downwardly adjusted depending on the amount of torque output independently exhibited by the individual motors. In this manner, a significant divergence in torque output between the motors may be avoided so as to ensure substantial load sharing between all of the motors of the assembly.

Description

technical field [0001] Embodiments described herein relate to motors used to drive loads downhole in a wellbore. In particular, an embodiment of a load sharing motor in the form of a downhole power assembly is described. The motor assembly may be configured to be sized for the downhole environment and drive a load with improved load sharing between the motors themselves. Background technique [0002] Drilling, completing, and operating hydrocarbon wellbores involves the use of a variety of power equipment. Examples of large-scale surface equipment typically used in oil fields are positive displacement pumps, mixers, and material transport units, among others. In addition, a lot of small downhole equipment, such as tractors and logging equipment, is often used in the wellbore itself. As detailed below, a piece of surface equipment, such as a single positive displacement pump, may be powered by multiple motors that share the load driving the operation of the pump. In fact,...

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Problems solved by technology

This makes using conventional mechanical motors generally impractical

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