The non - flare wellhead on - site repair technology kit mainly consists of an internal unidirectional anchor packer for casing, hydraulically driven internal cold pipe cutters, external cold pipe cutters, on - site pipe thread turning equipment, variable - frequency hydraulic power units, pipe thread seal testing kits, a series of commonly used thread gauges, four - in - one monitoring and early warning instruments, and supporting special tools. Depending on the actual on - site situation, it undertakes different tasks at different construction stages. The variable - frequency hydraulic power unit is placed in a safe area, at the side or upwind of the risk area centered around the wellhead as specified by QHSE regulations, and is connected by flexible high - pressure pipelines to drive the internal and external pipe cutters, on - site pipe thread turning machines and other equipment.