Riser Analysis and Off-Shore Drilling

[Posted on October 23rd, 2013 by Bill Stewart]

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Riser analysis is vital to your offshore-drilling company. It offers you information about the type of riser you need, the quality of your riser, and any problems you might have or be having. There are a number of different types of flexible risers, and with riser analysis, you can determine which riser will work best for you.

Stewart Technology Associates has used OrcaFlex technology to analyze risers. The software allows the company to look for critical issues and to determine solutions with all the information needed. This software is one of the most effective products in the marine technology world, and it’s used with over 170 organizations all around the world because of its quality. Stewart Technology Associates offers this technology and the ability to perform services like riser analysis, CE marking, jack up analysis, and others.

Your riser is an important part of your business. Risers are used to transport materials from the seafloor or below to your platforms at the surface, where you can then transport and use the materials. Risers often are referred to as pipelines, as they are essentially vertical pipes.

There are a number of different types of risers you can choose from including attached risers, steel catenary risers, flexible risers, and others. Attached risers, for example, are often used with fixed facilities because they won’t be moved often or at all. Steel catenary risers are often considered the best value for your money, as they are flexible and can be made hundreds of meters long. They are often attached to floating platforms that may move, and they are sometimes curved to withstand more movement than other types of risers.

Pull tube risers are threaded through the center of the facility, which means that there are actually two pipes in use. The pipe on the sea floor is essentially pulled up through the secondary riser to allow the transport of fluids and gases.

Flexible risers were made to withstand vertical and horizontal movement. This means they can easily be used with floating facilities that have to move or be moved often. This is commonly used because of the ability of the risers to stand up to the changes in the ocean’s movement, and buoyancy can be changed to suit the area and needs of the particular riser.

With riser analysis, you can be certain that your riser is working correctly, so you won’t be leaking important materials or trying to work with a pipe that doesn’t want to function in the environment where you’re completing offshore drilling. Stewart Technology Associates has worked in the industry for over 20 years and can help you determine the best riser choice for your needs or work with you to analyze the risers you already have.

Why Are Flexible Risers Needed For Offshore Drilling?

[Posted on October 9th, 2013 by Bill Stewart]

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Flexible risers are needed for offshore drilling. Without the use of risers on the ocean, it would be near impossible to access most of the world’s gas and oil supplies. Risers make it possible to obtain the gas and oil in the ocean’s crust and floor, and to do so, must be hundreds of meters long in some cases. These pipes must be strong and flexible to withstand changing ocean conditions and need to be able to hold up over time against salt, damage, and use.

Flexible risers help connect platforms to oil and gas below the surface of the ocean. They also help to transport fuel to platforms where it can be packaged and transported to nearby oil refineries or stations. There are many types of these risers available, and with riser analysis you can determine which type will work best in your particular situation. While there are many types, there are two main forms that most people will work with. Those include the steel catenary rise and bottom-weighted riser. While both are similar, they have significant differences that can make your work easier when implemented correctly.

Of the types of risers available, the one that offers the most benefits for the price is often the steel catenary riser. This riser has flexible steel pipes, is designed for deep-water drilling, and can be hundreds of meters in length, which makes it easy to connect your platform to the ocean floor and beyond. Normally, these operate between 2,000 and 5,000 psi, and they have a diameter of 8 to 12 inches.

Flexible risers such as the steel catenary riser often costs less to manufacture. Because of the amount of steel being used, the cost impact can be significant and beneficial. These risers are very dependable, and they resist high temperatures, pressures, and can be flexible to work with the changing patterns of the ocean.

At Stewart Technologies, you can select these risers or other styles that you prefer. Another solution you may prefer includes the bottom-weighted riser. This riser is similar, but it has a rigid elbow and horizontal parts made with titanium for strength. Stewart Technologies can help you determine the best choice for your drilling needs through riser analyses, so you don’t spend extra money on the wrong item. With the right tools, your drilling will go smoothly and allow you to work with fewer dangers on the job. With low-cost and lower-cost solutions, you can select the right piping and risers for your business, the location, and your needs.

Why Focus On Cable Dynamics With Offshore Drilling?

[Posted on October 9th, 2013 by Bill Stewart]

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Cable dynamics is a big part of offshore drilling because you have to maintain stability at all times. Each time you add more weight, the cables have to be adjusted to ensure there are no problems with the overall stability. This means it has to be a primary focus with each and every thing that you do on the rig.

There are a lot of things that need to be considered when you set up an oil rig. You need to look at offshore living to ensure all of your workers have a place to sleep as well as to entertain themselves when they are not working. This is added weight on the rig and will affect cable dynamics.

You will need to look at steel catenary risers to accommodate all of the waves that you will encounter. Each and every area of the world has different wave patterns. As a result, you will not be able to use the same cable layout every time. It will have to be recalculated because you will have a completely different list of “what if” scenarios to worry about.

Your goal is to minimize the number of problems that can occur when you are out on the rig. Each and every time there are rig problems, it ends up in the news. Any bad press is enough for investors to pull out of your project and this needs to be avoided at all costs, literally.

With cable dynamics, you can ensure the calculations are accurate by using the right software. You can also have a professional analysis done to run the calculations for you again. This extra set of calculations can ensure that you have the weight effectively managed and balanced and that you have thought about how the water is going to play into the stability of your rig.

Depending upon where your rig will be, there are going to be all sorts of things that can happen. If there is a large storm while you are out there, the waves are going to get larger and this is going to send the rig in motion. If you focus enough on the cable dynamics, you will have enough tension in the cables but provide enough slack to avoid anything snapping. The last thing you want to do is lose equipment because you didn’t make accurate assumptions about your environment.

There is enough to worry about in the world of offshore drilling that you don’t need something else to worry about. You may not have a technolgy expert on your rig and this means that you need someone else to be able to run your numbers for you.

If you take the time to focus on cable dynamics, much of the other things that are of a concern will fall into place on their own.

Guide to Steel Catenary Risers

[Posted on October 2nd, 2013 by Bill Stewart]

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Many oil rigs will need to implement steel catenary risers in order to keep their pipelines operating correctly.  They are a surprisingly integral part of these different operations, including cable dynamics.  If you need to buy these units, you will need to make sure that you are getting the right fit for your rig.  They should be also be able to withstand quite a bit of pressure from waves that undulating around the pipeline.  If you haven’t bought these units before, you might want to read through some basic information first.  This can help you make sure that your risers are being installed properly.

First, oil rig operators should carefully think about the way that these steel caternary risers function with these different platforms.  An oil rig will typically sit on one location above the ocean floor.  But it may have several pipes that extend outwards to reach different deposits of oil that are underground.  If your oil rig operates in deep water environments, you may have pipelines that extend outwards for hundreds of feet.  These pipelines will need to remain relatively stable in order for them to function properly.  This may affect the return rate that oil rigs get when the draw from an underground source.

In order to get the right steel catenary risers, it can be important to understand some basics about cable dynamics.  You may have different sizes and weights to your descending pipelines, so you will need to get the right risers for this.  Many oil rigs will be able to work in conjunction with technology experts to anticipate the right risers that they may need.  You will want to make sure that that risers are lifting the pipeline to a specific curvature underwater.  These risers will provide the strongest connection between the pipelines and the oil rigs themselves.

You may also want to look for steel catenary risers that will be graded for different water pressures.  Many of them can operate at water pressure gauge up to 5000 psi, which can help them resist a good amount of wave intensity.  There are many underwater currents that can put a high degree of pressure on these pipelines.  The steel catenary risers you put on your pipeline will be your first line of defense against this.  This is why it can be important to make sure that your risers fit snugly against the exterior of the pipeline itself.

Finally, some oil rig operators will want to see about checking in on the quality of their installed risers from time to time.  They can degrade eventually, so they will need to be replaced.  If they haven’t had routine repairs, they may lose their grip on the pipeline.  Watch for warning signs, like whether the pipeline itself begins to sag or sway unexpectedly.  This can be a clue that repairs or replacements need to conducted somewhere along the course of the line.

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