Subsea well completion system, a base template for the system and a method of establishing production capability from multiple subsea wellheads

摘要

A subsea well completion system includes a fluid-tight work enclosure hull 13 containing manifold means and having a plurality of radially- disposed lateral penetration means 38 which extend through the hull 13 and are operatively connected to the manifold means. The system also includes a base template 11 having means for securing the template 11 to the marine floor in a substantially horizontal position and having a lower support structure for supporting the work enclosure hull. The template 11 is further provided with an upper guidance structure comprising a plurality of substantially vertical guide members 19 mounted in spaced radial array, the guide member 19 extending inwardly toward the center of the template and forming an opening at the central portion of the template for receiving the work enclosure hull, a portion 20 of the upper peripheral surface of each guide member 19 sloping downwardly toward the opening for guiding the hull 13 as it is lowered during installation of the hull onto the template. To establish production capability from multiple subsea wellheads 14 on the template 11, with the template being secured to the marine floor, the work enclosure hull 13 is lowered towards the template 11 from a position directly above the template. The upper guide structure then guides the hull 13 into the central cylindrical opening defined by the guide members 19 and, when the hull is in position, fluid communication is established between the wellheads 14 and the manifold means through respective penetration means 38. IMAGE