Method and apparatus to perform subsea or surface jacking

摘要

A jack system may provide subsea or surface operation. The jack system includes a top plate and a base plate with at least two pistons disposed between the base and top plate. The pistons are extendable to increase a separation distance between the base and top plate, and said pistons are retractable to decrease the separation distance between the base and top plate. The jack system also includes a bottom slip bowl assembly, a top slip bowl assembly, and rotary assembly. The top slip bowl and rotary assembly are rotatably coupled to the top plate wherein the rotary assembly and the top slip bowl assembly rotate relative to the top plate.

主权项

1. A jack system comprising:
A top plate; A base plate; At least two pistons disposed between the base plate and top plate, wherein said at least two pistons are extendable to increase a separation distance between the base plate and top plate, and said at least two pistons are retractable to decrease the separation distance between the base plate and top plate; A bottom slip bowl assembly positioned on the base plate; and A top slip bowl assembly and a rotary assembly rotatably coupled to the top plate, wherein the rotary assembly and the top slip bowl assembly rotate relative to the top plate, and the jack system is secured to a subsea wellhead for subsea operations to run and retrieve a workstring in a subsea well and pull or tension a tubular of the workstring, Wherein further the at least two pistons are extended to exert a predetermined amount of tension on the workstring, wherein the predetermined amount of tension corresponds to a desired backoff joint, and exerting the predetermined amount of tension causes forces at the desired backoff joint to be minimal relative to other joints in the workstring, and the rotary assembly and the top slip bowl assembly are rotated while the at least two pistons exert the predetermined amount of tension on the workstring, wherein the rotation of the rotary assembly and the top slip bowl assembly causes the workstring to disconnect at the desired backoff joint.