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Oil resistant and MUD resistant cables – Test procedures and requirements

NEK TS 606 requirements for oil and MUD resistance are more demanding than IEC 60092-360 requirements. These are highlighted in table 1

All SHF2 sheathed cables shall be suitable for an oil production installation.

Minimum required oil resistance
All SHF2 sheathed cables covered by this specification shall fulfil minimum oil resistance according to table 1a.

Oil resistance shall be demonstrated by a test according to IEC 60092-360, SHF2 where test oil IRM902 is specified. Requirements are listed in Table 1a

Similar test shall also be performed with test oil IRM903. Requirements are listed in table 1a.

Optional Enhanced oil resistance
Oil resistance shall be demonstrated by a test according to IEC 60092-360 Annex C.

Test oils shall be IRM902 and IRM903. Requirements are listed in table 1b.

*MUD resistance – (Mandatory requirement for NEK 606 cable descriptions containing SHF2 MUD RESISTANT)
For a cable to be MUD resistant, it must first be qualified as NEK 606 Enhanced oil resistant.

Oil resistance shall be demonstrated by a test according to IEC 60092-360 Annex D. 3.

Test Liquids shall be Calcium Bromide Brine (Water Based) and EDC95-11 (Oil Based). Requirements listed in table 1c.

*When field specific MUD deviates from NEK 606 standard MUD test fluids, (table 1c) special evaluation or testing should be agreed.
0.6/1kV and above shall be in accordance with IEC 60228 class 2 or class 5.

able 1. Oil and MUD resistant tests   Unit   Requirement   
a. Minimum required oil resistance         
Mechanical properties after ageing in IRM902 and   °C   100 ±2   
IRM903:   h   24   
         
Temperature/tolerance of oil         
Duration of treatment         
         
Results to be obtained:   %   ±30   
   %   ±30   
Tensile strength, variation max         
Elongation at break, variation max         
         
b. Optional, enhanced oil resistance         
Mechanical properties after ageing in IRM902 and   °C   100 ±2   
IRM903:   d   7   
         
Temperature/tolerance of oil         
Duration of treatment         
         
Results to be obtained:   %   ±30   
   %   ±30   
Tensile strength, variation max   %   ±30   
Elongation at break, variation max   %   ±30   
Volume swelling, variation max         
Weight change, variation max         
         
c. Optional, MUD resistance         
Mechanical properties after ageing in Calcium Bromide:   °C   70 ±2   
   d   56   
Temperature/tolerance of oil         
Duration of treatment         
         
Results to be obtained:   %   ±25   
   %   ±25   
Tensile strength, variation max   %   ±20   
Elongation at break, variation max   %   ±15   
Volume swelling, variation max         
Weight change, variation max         
         
Mechanical properties after ageing in EDC 95-11 base oil::   °C   70 ±2   
   d   56   
Temperature/tolerance of oil         
Duration of treatment         
         
Results to be obtained:   %   ±30   
   %   ±30   
Tensile strength, variation max   %   ±25   
Elongation at break, variation max   %   ±25   
Volume swelling, variation max         
Weight change, variation max         
         
d. Optional, hydraulic oil resistance, (Test oil to be agreed between producer and user)         
Mechanical properties after ageing in Calcium Bromide:   °C   100 ±2   
   d   7   
Temperature/tolerance of oil         
Duration of treatment         
         
Results to be obtained:   %   ±30   
   %   ±30   
Tensile strength, variation max   %   ±30   
Elongation at break, variation max   %   ±30   
Volume swelling, variation max         
Weight change, variation max         
         
         
Note:         
         
Requirements marked in bold and italic text are more demanding than IEC 60092-360:2014.         
EDC 95-11 is a well-defined base oil often used in oil based drilling fluids         



Note:

    Requirements marked in bold and italic text are more demanding than IEC 60092-360:2014.
    EDC 95-11 is a well-defined base oil often used in oil based drilling fluids


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