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The Guide to Oilwell Fishing Operations, 2nd Edition by Joe P. DeGeare

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Chapter 26

Thru-Tubing Workover Motors

Abstract

Thru-tubing workover motors are run through production tubing and provide rotation and torque for coiled tubing fishing, underreaming, milling, and cutting.

Keywords

Compressible fluids

Elastomeric stator

Equidistant stator

Positive displacement motors

Thru-tubing workover motors

Thru-tubing workover motors are run through production tubing and provide rotation and torque for coiled tubing fishing, underreaming, milling, and cutting.

Workover motor components

Positive displacement motors (PDMs) have three major elements (Figure 26-1). From top to bottom, they are the power section, transmission, and output shaft and bearing assembly.

Figure 26-1 Positive-displacement motor. (courtesy of Baker ...

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