The concept of cable dynamics has been used for many years. It has to do with virtually anything cable related to ensure stability, strength, and reliability. Different materials and different uses can impact the end result and when you are using cables on an oil rig, analysis needs to be conducted.

Complex Rigging for Heavy Lifts

Understanding the full cable dynamics of a project will make it easier to train everyone involved. The the science of cables can be complex, but when everyone knows the limitations and the range, it will be easier for them to manipulate the rig and work within it. Various forms of analysis can also be used to stage various training scenarios so everyone knows how to make a repair when something goes wrong.

Preparation

You should always be prepared for what’s going to happen on a rig, whether it is offshore or not. There’s a lot that can go wrong and it’s best to know what the various scenarios are. At Stewart Technology Associates, you can order all of the necessary analysis, including anchor analysis so that you have the various numbers and thresholds in front of you. With this documentation, you can go forward knowing that you have done all that you can to prepare for a specific project before going live with it.

Parts Selection

There are various oil rig parts and some are going to be better than others in certain scenarios. By having a firm grasp on the cable dynamics, you can be sure that the cables are chosen based upon the weight and pressure of the environment and that the materials are capable of enduring the heat, salinity, and other factors that will surround them.

Funding

Often, those who are funding an oil rig project want to see all of the documentation as well as all of the costs laid out ahead of time. Most financial supporters are savvy to the gas and oil industry and therefore they know that there are accidents that can happen. Your goal is to take the precautions to minimize accidents and therefore you want to supply investors with as much documentation as you can to show that due diligence has been taken and that cable dynamics has been considered throughout the construction of the rig as well as the entire strategy.

Risk Management

Risk management is another way to benefit from cable dynamics. The more you know about the cables, their resistance, and their overall durability, the more you can minimize risks. Especially offshore, you cannot allow for any injuries or accidents because help is not close by. Risk management is a combination of staff training, preparation, and overall analysis – and is not something that you can forget to do when establishing a project within the gas and oil industry. Stewart Technology Associates can help you every step of the way.

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Cable dynamics may not be something you think of when you talk about going out on an oil rig. Any time you are on the water with an anchor, drilling equipment, or anything else, you have to look at the dynamics of a cable because there are various factors that need to be considered.

Decoupling Deep Ocean Cable Dynamics

Above figure shows lazy-wave geometry for a Tyco SL14 SPA cable in 6000 meters water depth for US Navy application.  Cable floats have been designed by STA for a section (shown blue) and analyzed in OrcaFlex in a sea state 6.  The tension range at the top end is low and easily tolerable.  The tension range at the touchdown has been reduced to less than 1 kN.

Cable laying and support vessel in OrcaFlex, shown above.

There are going to be cables connected to your rig. They go up and down as the water goes up and down. When you are drilling, you have to consider the depth of the sea. It is very much like an anchor. An anchor is only going to be effective if it is able to reach the bottom. Otherwise, it is simply going to dangle from the boat and cause you to drift. The anchor is therefore not as effective as it could be and all because you were unprepared for the depth of water that you would be in. the same goes for the cables. Understanding depth is vital to the success of your project.

Waves

The physics of waves should be explored in depth when you’re going to be out on the water. You need to know when they are going to occur, where, the height of the waves, and more. All of these are going to play a role in the equipment you choose and the training you give your employees. Failure to recognize the importance of waves can result in problems on the water – and you could end up injuring someone or destroying a part of the rig.

Movement on the Rig

There’s going to be movement on the rig due to all sorts of factors – wind, weight of what’s on the surface, and even movement of employees. These are going to be factors when calculating the cable dynamics.

Overall Stability

Stability is critical and when you’re on a rig or even fishing, there are going to be cables or other lines in the water and then connected to your boat or rig. When working with steel catenary risers, they are responsible for the fluid transfer from one area to another. If the cable dynamics haven’t been explored to the fullest, the transfer could be broken simply because of one variable that was missed during the setup, such as bigger waves or deeper water.

Accident Prevention

It’s important to prevent accidents and when you are dealing with being on a rig that could be on the water for months at a time, you have to think about everything. The more you know about potential accidents on the water, the more you can prepare your employees for what could happen. Having analysis at your fingertips as to what you could experience can be invaluable when you are looking to train employees, purchase equipment, and stock the rig before leaving the shore.

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