Drum unit for a well intervention string

A drum unit for an intervention string for a well, comprising:

• a drum with a radius for said intervention string, arranged in a structural frame and rotatable by a motor, said drum being arranged for translating along a drum axis and driven by a translation motor, for controlled winding of said intervention string onto said drum relative to a first, fixed guide in said structural frame;
• a tension compensator for said intervention string,
• wherein said compensator comprises a guide arch, said guide arch being displaceable in a direction orthogonal to said drum axis using a force device at said structural frame,
• wherein said intervention string runs between said guide arch and said first fixed guide to or from a first end of said guide arch to said drum, and runs via a second, opposite end of said guide arch via a second, fixed guide at said structural frame, to or from said well, directly or indirectly, and
• wherein an intervention string guide channel with at least one bend restrictor for said intervention string is arranged between said second, fixed guide and an injector head on said well, and said intervention string guide channel comprises pipes of fixed shape in combination with said at least one bend restrictor.