Unions kicked off talks with Norway’s industry body on Tuesday to achieve a new pay settlement for oilfield service employees after negotiations for platform workers partially broke down last week.

The Industri Energi and Safe unions that represent about 6000 workers at companies such as Halliburton and Schlumberger are set for three days of talks to reach a deal with Norwegian Oil & Gas (Norog).

They are reported to be demanding a higher wage increase than the Nkr18,000 accepted last week by Industri Energi for platform workers but rejected by Safe and another union, Lederne, that are also demanding improved pension rights.

“It’s always a little more demanding to obtain a bigger increase than others have gotten,” Industri Energi leader Leif Sande, whose union represents about 90% of oilfield service workers, told Bloomberg.

Negotiations between the other two unions and Norog for platform workers have now been referred to government mediation, raising the spectre of a similar rift over pensions that resulted in a crippling 16-day strike in 2012 that hit the country’s oil and gas production before the government imposed a settlement.

The talks cover more than 7600 employees on offshore installations run by nine operators including Statoil, BP and Shell, as well as personnel working for services providers ESS and Sodexo and drilling player KCA Deutag.