Patent ID: 9151123
Filing Date: 2015-10-06
Classification: E21B

Abstract:
1. Apparatus for injecting tubing from a structure located proximate to the surface of a body of water into a well extending into the earth below the water and sea floor, the apparatus comprising: at least one surface injector associated with the structure, engaged with the tubing and positionable proximate to the surface of the water, said surface injector being adapted and arranged to control the movement of the tubing into and out of the underground well below the sea floor during normal operations; and at least one underwater injector engaged with the tubing, deliverable on the tubing from the structure to the well, releasably engageable with the well and being arranged and adapted to apply limited downwardly-directed pushing forces and limited upwardly-directed pulling forces to the tubing, said at least one underwater injector being arranged and adapted to be delivered on the tubing to the well without the use of one or more risers extending from the structure to the well, wherein at least one among said at least one surface injector and said at least one underwater injector is arranged and adapted to maintain the tubing in substantial tension between said at least one surface injector and said at least one underwater injector, further wherein said at least one underwater injector is configured to apply and applies only such downwardly-directed pushing force to the tubing as is necessary during operations to overcome wellhead pressure and well friction occurring when inserting the tubing into the well and to maintain tension on the tubing above said at least one underwater injector.