Power Section Elastomers

Oil-Based Muds:

Oil-based muds and muds that contain oil can reduce stator life.  The degree of stator damage depends on the specific chemistry of the oils used. Some oils react very little with elastomers while others are highly reactive. Tests for mud-elastomer compatibility may be conducted with the fluids are anticipated.  Contact your Dyna-Drill® representative for testing in your specific application.  Due to severe degradation of elastomers exposed to drilling fluids above 260 F, Dyna-Drill® strongly recommends that elastomer compound selection be based on fluid compatibility testing.

Mud Additives:

Certain mud additives, such as emulsifiers, corrosion inhibitors, and scavengers, can (even in very small quantities) cause elastomer failure.

Water-Based Muds:

The adhesives used to bond elastomers can undergo hydrolysis when exposed to water, especially at temperatures in excess of 200 F.  Bond-strength degradation can trigger a multitude of problems from minor to catastrophic.  Selecting stator rubber compounds in water-based systems should be based on the recommendations in the “Power Sections” table below.

Emulsified Systems:

Emulsified systems that contain a mixture of oil and water require laboratory testing for a specific application.  A balance is required for the swell resistance of an HSN versus the bond strength of an NBR.

PC Pump Elastomers