Patent ID: 7980787
Filing Date: 2011-07-19
Classification: E21B

Abstract:
1. A method for tensioning casing from an oil or natural gas well to a floating structure comprising: a. installing a plurality of dual pressure cylinders to a tensioner table, wherein the tensioner table has a plurality of load buckets, wherein each load bucket receives an end of one of the dual pressure cylinders, further wherein each dual pressure cylinder comprises: b. orienting the tensioner table with the plurality of dual pressure cylinders between a first guide post disposed to a first side of the tensioner table and a second guide post disposed on a second side of the tensioner table, wherein the first side is opposite the second side, further wherein the plurality of dual pressure cylinders are disposed between the first and the second guide posts; c. connecting a tension joint with a tension ring to the tensioner table, wherein the tension joint engages wellhead equipment; d. connecting an umbilical to the tensioner table, wherein the umbilical communicates between the tensioner table and a controller; e. securing a housing having a plurality of pistons to the first and second guide posts and connecting each of the plurality of dual pressure cylinders to one of the pistons around a conductor; f. allowing fluid to drain through a housing bottom cap; g. connecting the housing bottom cap to a riser; h. pressurizing each of the dual pressure cylinders to a preset pressure limit; i. simultaneously monitoring the pressure of each of the dual pressure cylinders; and j. adjusting the pressure in each dual pressure cylinder individually when pressure in one or more of the dual pressure cylinders rises above or falls below the preset pressure limit, or when sea conditions of the floating structure change.