How does a riser tensioner work?
Cameron wireline riser tensioners are available in three versions—160,000-lbf, 200,000-lbf, and 250,000-lbf double-wire rope tensioners. Their design includes idler sheaves, wire, rotating deadline drum, valve block skids, air pressure vessels (APVs), control system, antirecoil, and optional air compressors.
What is a BOP riser?
Marine Drilling Riser In these types of risers, blow out preventers (BOP) are located on the seabed. These risers consist of low pressure main tubes along with auxiliary lines which carry high pressure choke and kill lines for the blowout preventer located on the seabed.
What are the two interfaces for a drilling riser?
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 deployed from fixed platforms or very stable floating platforms like a spar or tension leg …
What is a riser joint?
1 Riser Joint Properties. Riser joint properties include their weights in air, in water, with buoyancy, and without buoyancy. These weights can vary as the joints are deployed in deep water due to compression of the buoyancy and water ingress.
What is the capacity range for a riser tensioner system?
Typically, the system is designed for a maximum static vertical load of up to 4,800 kips at well center, and sliding with 1,600 kips. The tensioners are attached to sliding plates which ride on composite bearing material.
Why is it important to know the minimum top tension?
Minimum tension is established to prevent buckling of the riser. Maximum tension is established to prevent top tensions in excess of the installed capacity of the riser.
Why do we need BOP in drilling operation?
A blowout preventer (BOP) (pronounced B-O-P, not “bop”) is a specialized valve or similar mechanical device, used to seal, control and monitor oil and gas wells to prevent blowouts, the uncontrolled release of crude oil or natural gas from a well. They are usually installed in stacks of other valves.
What does Riserless drilling mean?
“Riserless drilling” does not use Riser pipe. Instead, in “Riserless drilling”, the drillpipe runs into the open water to the sea floor and into the borehole. Here, seawater is used as drilling fluid. The cuttings are not returned to Chikyu and are washed out of the borehole onto the sea floor.
What is a pipeline riser?
Riser is defined as the vertical or near-vertical segment of pipe connecting the facilities above water to the subsea pipeline. The riser portion extends (as a minimum) from the first above-water valve or isolation flange to a point five pipe diameters beyond the bottom elbow, based on codes.
What is BOP control unit?
Overview: A blowout preventer (BOP) is a large, specialized valve used to seal, control and monitor oil and gas wells. Blowout preventer control systems (BOPs) were developed to cope with extreme erratic pressures and uncontrolled flow (formation kick) emanating from a well reservoir during drilling.