Patent ID: 6955503
Filing Date: 2005-10-18
Classification: E02B

Abstract:
1. A method for re-deploying an offshore jacket using a plinth, wherein the method comprises the steps of: a. locating an offshore jacket comprising at least three jacket legs, each jacket leg comprising a jacket leg mud mat, and wherein the offshore jacket is connected to a seabed at a first site at a first depth to be re-located to a second site at a second depth, wherein the second depth is deeper below a sea level than the first depth; b. constructing a plinth, comprising: c. placing the plinth at the second site; d. driving one skirt pile into each skirt pile sleeve; e. disconnecting the jacket legs from the seabed at the first site; f. lifting the offshore jacket above the seabed; g. moving the offshore jacket from the first site to the second site; h. lowering the offshore jacket such that each jacket leg stabs into each guide cone on the plinth until each jacket leg mud mat contacts each trestle; and i. inserting pin piles through each jacket leg and plinth leg and grouting the pin piles to effect a permanent structural connection between plinth and jacket.