Elastomers &
rotor coatings

In cooperation with Russian Academy of Sciences we formulated new math models which help us select fit-for-purpose elastomer compounds and injection parameters. Rubber compounds are from the leading German and American manufacturers.
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Elastomers & rotor coatings

SOKOL Drilling motors and tools has developed Nitrile Butadiene Rubber (NBR) for standard requirements and also Hard Rubber (HR) for higher torque requirements. Stators with Oil-Resistant Elastomer (S) are recommended for oil-base muds while High-Temperature Elastomer (T) stator can be utilized at temperatures up to 180°C. In cooperation with Russian Academy of Sciences we formulated new math models which help us select fit-for-purpose elastomer compounds and injection parameters. Rubber compounds are manufactured and supplied by the leading German and American rubber manufacturers with high physical and mechanical properties.

Properties Value
Density, kg/m3, max 1500
Sand, %, max 1
Chlorides, kg/m3, max 50*
Oil content, %Conventional (N) stator, hard rubber (HR) stator, high-temperature stator (T) 10
Oil-resistant stator (S) 100**
Temperature (dynamic downhole), ºC, max:Conventional (N), hard rubber (HR) stator, oil-resistant (S) stator 120**
High-temperature stator (T) 180**

* - higher chlorides content requires a special coating on the rotor (may be custom-made).

** – temperature- and oil-resistant stators may be custom-made.

Chlorides in mud can severely corrode chrome plating on rotors and, as a result, deteriorate stator elastomer. Certain additives in mud can have a detrimental effect on mechanical properties of the stator elastomer and severly reduce the life of the stator.

in Solutions of Various Densities (at 15ºС)

Mass concentration, %NACLKCL
Density,
kg/m3
Salt content, kg/m3Chloride ion content, kg/m3Density,
kg/m3
Salt content, kg/m3Chloride ion content, kg/m3
11 006951 002115
21 01217101 0102010
31 01826161 0163014
41 03046281 0224019
51 03654331 0285124
61 04263381 0356330
71 05483501 0417335
81 06091551 0488340
91 066100611 0559445
101 072108661 06110650
111 078117711 06811756
121 090134811 07412861
131 093139841 08214167
141 096144871 08915473
151 099149901 09516579
161 1201841121 10217784
171 1261941181 10919090
181 1382111281 11620397
191 1442211341 123214102
201 1502311401 131225107
211 1622511521 138238113
221 1682611581 145251119
231 1742711641 153265126
241 1862911771 161280133
251 192301183---
261 198311189---

Rotors can be chrome plated in acc. with HEEF-25 process, or HVOF / HVAF tungsten carbide coated with ceramic sealing for maximum wear and erosion protection.

CoatingLife, hours
Normal mudSalt-saturated mud
Chrome plating HEEF-25250...30050...70
Unplated stainless steel150…200130…150
Chrome plating with subsequent ceramic densification450...500350…400
Tungsten carbide coating applied by HVOF / HVAF with subsequent ceramic densification1000…15001000…1500
Wear-resistant coatings with subsequent fusion process700…750700…750

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