Abstract: The snubbing unit inserts a tubular member into a well without a riser. The snubbing unit includes a set of stationary slips in a first base plate, a first set of traveling slips in a second base plate, a second set of traveling slips in a third base plate, and a plurality of hydraulic cylinders connecting the base plates. Each set of slips has an engaged position and a released position relative to the hydraulic cylinders. The base plates are cooperative with a pipe guide so that movement of the tubular member between the base plates corresponds to consistent support of the tubular member to preventing buckling. The snubbing unit increases safety and support for inserting into the well without a riser.

Abstract: The snubbing unit inserts a tubular member into a well without a riser. The snubbing unit includes a set of stationary slips in a first base plate, a first set of traveling slips in a second base plate, a second set of traveling slips in a third base plate, and a plurality of hydraulic cylinders connecting the base plates. Each set of slips has an engaged position and a released position relative to the hydraulic cylinders. The base plates are cooperative with a pipe guide so that movement of the tubular member between the base plates corresponds to consistent support of the tubular member to preventing buckling. The snubbing unit increases safety and support for inserting into the well without a riser.

Abstract: The system for inserting a tubular member from a surface into a subsea well includes a riserless vessel, a surface injector being mounted on the vessel at the surface and delivering tubular member, such as coiled tubing, to the subsea well from the surface, a subsea snubbing jack releasably engaged to the tubular member, a subsea hydraulic power unit connected to the snubbing jack, and a device to maintain tension of the tubular member between the surface injector and the snubbing jack. The dynamic control of the subsea snubbing jack provides either active additional force for pipe light and pipe heavy conditions or passive support of the tubular member for equilibrium conditions without a riser. The method is responsive to transitions between well conditions. A riserless system without a subsea injector can more efficiently and reliably insert coiled tubing under various well conditions and during changes in the well conditions.

Abstract: The system for inserting a tubular member from a surface into a subsea well includes a riserless vessel, a surface injector being mounted on the vessel at the surface and delivering tubular member, such as coiled tubing, to the subsea well from the surface, a subsea snubbing jack releasably engaged to the tubular member, a subsea hydraulic power unit connected to the snubbing jack, and a device to maintain tension of the tubular member between the surface injector and the snubbing jack. The dynamic control of the subsea snubbing jack provides either active additional force for pipe light and pipe heavy conditions or passive support of the tubular member for equilibrium conditions without a riser. The method is responsive to transitions between well conditions. A riserless system without a subsea injector can more efficiently and reliably insert coiled tubing under various well conditions and during changes in the well conditions.