Analyze hydraulics to select an appropriate PDM

PD MOTORS—ConclusionThe mathematical relationship between internal geometry and performance can guide seletction of PDMs. The selection process matches downhole positive displacement motor (PDM) performance with available hydraulic horsepower, expected bit torque, and downhole cleaning requirements.Part 1 (OGJ, Jan. 24, 2005, p. 41) of this series discussed PDM power performance based on aspects of the internal geometry, such as lobe number, cavity size, and stage length. Available hydraulic horsepower at the drill bit was also discussed. This concluding article explains how to integrate PDMs into drilling rig hydraulics, with several examples illustrating the rationale.The starting...

Why Register?

Non-subscribers can only view whitepapers by providing name, home and email address, phone number and other information and comment on/rate articles.

Why Subscribe?

Oil & Gas Journal subscribers with login credentials can access these premium features of OGJ Online:

  • Current Issue – an html version of the current week's issue of Oil & Gas Journal.
  • Past Issues – An Electronic OGJ Archive. A keyword-searchable archive of all issues of Oil & Gas Journal dating back to 1990; also searchable by issue date.
  • Market Journal – a weekly round-up of the oil and gas markets, with observations from leading analysts.
  • Editor's Perspective – a short article of insight and opinion by the Editor of Oil & Gas Journal.
  • OGJ Industry Stats – quick access to current industry statistics from Oil & Gas Journal.
  • OGJ Survey Downloads - quick access to exclusive reports from Oil & Gas Journal.


Subscriber Help or Subscribe

Oil & Gas Journal Subscribers: Have your subscription number (from the mailing label on the cover of your Oil & Gas Journal) and e-mail address ready to set up your online account through Customer Service Assistant.

If you're not an Oil & Gas Journal subscriber, start a subscription and gain access to the subscriber areas of OGJ Online now.

Stay Connected