Patent ID: 9458684
Filing Date: 2016-10-04
CPC Classification: E21B

Claim Text:
1. A petroleum well injection system for an intervention cable with a well tool run into or out of a well during a well operation, the petroleum well injection system comprising: a blow out valve BOP connected to a well head at said well; a lock chamber at the BOP arranged to contain the well tool before and after the well operation an injector for the intervention cable, with drive belts driven by an electric motor with controlled torque to exert a force upwards or downwards on the string, and a sensor for measuring the injector force or the tension that the drive belts apply to the intervention cable; a guide arch at the injector, wherein the intervention cable runs taut over the guide arch to a first end of a closed bending restrictor channel; a guide arch load cell arranged to measure the backward tension between an intervention cable and the first end of the bending restrictor channel; and a control unit for the electric motor calculating tensile stress in the intervention cable based on the backward tension and the injector -force or- tension and regulating feeding or hauling of the intervention cable, wherein the drive belts are supported floating at injector load cells, wherein the other end of the bending restrictor channel is connected to a drum frame with a motor running a drum for the intervention cable, and wherein the drum frame is arranged with a resilient tension compensator arch for the intervention cable between the drum frame and the drum.