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[12] [13] The risers are typically 8-12 inches in diameter and operate at a pressure of 2000-5000 psi. [14] Designs beyond those ranges of pipe sizes and operating pressures are also feasible. Free hanging SCRs were first used by Shell on the Auger tension leg platform (TLP) [15] in 1994 which was moored in 872 m of water. [16]
A hydraulic riser tensioner consists of a hydraulic cylinder with sheaves at both sides. The cylinder is connected to a number of high-pressure gas bottles via a medium separator. A wire rope is rigged in the cylinder; one end is connected to the fixed part of the tensioner, the other end is connected to the riser. [1]
The guidelines act as a guidance for equipment and tools that must be lowered to the template. If there was no tensioner and the platform moved, the guidelines would become slack and could be broken. For this reason a number of guideline tensioners are mounted between the platform and riser.
Drilling riser joints with buoyancy modules. A drilling riser is a conduit that provides a temporary extension of a subsea oil well to a surface drilling facility. Drilling risers are categorised into two types: marine drilling risers used with subsea blowout preventer (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally ...
A tension-leg platform (TLP) or extended tension leg platform (ETLP) is a vertically moored floating structure normally used for the offshore production of oil or gas, and is particularly suited for water depths greater than 300 metres (about 1000 ft) and less than 1500 metres (about 4900 ft).
DEAs are installed by means of dragging, using a mooring chain or wire, this relatively simple means of installation making the DEA a cost-effective option for anchoring offshore structures. DEAs are commonly used for temporary moorings of offshore oil and gas structures, e.g. mobile offshore drilling units. Their use in only temporary mooring ...
In such a case a floating production system is more appropriate, even with the increased cost of risers and mooring. Despite its flexibility, the compliant tower system is strong enough to withstand hurricane conditions. [4] The first tower emerged in the early 1980s with the installation of Exxon's Lena oil platform.
The company produces dynamic and static risers, static flowlines, subsea and topside jumpers, and expansion joints for use in the offshore oil and gas industry. The NKT flexible pipe is an unbonded structure consisting of helically wound metallic armour wires or tapes combined with concentric layers of polymers, textiles, fabric strips and ...