Offshore drilling is inseparably linked with the use of marine risers, which create a conduit from the sea floor, through the splash zone and up to a topside facility. This, in turn, allows for circulating and introducing fluids from surface, while equally ensuring that the wells contents are contained. The end goal of any drilling program: to produce from the well of interest.
At Reaching Ultra we have strategically selected three videos, to intimately depict marine risers operating offshore. The intent of posting these videos is threefold: to give an up-close view of their use in highly dynamic settings; to show the volatile environments in which they must operate; and to illustrate the manner by which they interact with a topside facility.
This video starts by illustrating a riser operating under adverse sea states, which is highlighted by the tensioners that attach to the riser's telescopic joint, causing them to function in a hyperactive state, as they offset the sea's conditions. The use of tensioning and telescopic systems is key in preventing the riser from stretching or parting, while allowing a topside facility to continue operating in an adverse environment.
As the video progresses, it shows the Emergency Disconnect System (EDS) being employed, due to the increased volatility of the sea states, to disengage the riser. Once this is done, it is important to observe the moonpool as the sea's violent movements subside. It must be noted that disconnecting in this fashion is used as a last resort, in the same manner Blow Out Preventers (BOP) are engaged in an emergency to control an anomalous well.
The above video, gives a greater depth of view of the sea's conditions on the riser, as the sea is not contained within the moonpool, as is the case with the first video. Furthermore, this particular video allows the viewer to fully observe the sea as it violently reacts against the topside facility. The video equally shows, in great detail, the telescopic and tensioning system operating in unison to operate in such harsh environment.
This video intimately details recovering sections of a riser string in a non-emergency setting. Moreover, the video does a fantastic job at capturing the complexity of carrying out the arduous task of recovering a riser in sections by way of topside manpower and machinery. Because of the complexity, and the time required to recover a riser, as shown here, the video equally illustrates why the first video required disconnecting the riser via the EDS option.
Editor's Note: All copyrights lie with the user accounts to which the videos are linked to, which is provided via the information button on each video. The videos illustrated herein strictly adhere to United States' Fair Use Doctrine. As such, they are used for educational purposes, and to review existing offshore technologies, while giving a trans-formative commentary in the manner by which the technologies in said videos interact with their environment. Reaching Ultra and the proprietors of said videos have no business association, relationship, or interest.
Image Citation: (Front Page) Evgeny Glyanenko via Dreamstime