In our opinion, it is very interesting decision made by Transcoean to sell all jack-up fleets to Norwegian offshore drilling contractor, Borr Drilling. With current oil market situation, Transocan has made decision to stay only deep water drilling.
Please feel free to share your thought about this.
News by Offshore Energy Today
Norwegian offshore drilling contractor Borr Drilling, formerly known as Magni Drilling, is planning to buy 15 jack-up drilling rigs from Swiss-based Transocean for $1.35 billion.
Borr Drilling announced on Monday the signing of a letter of intent with Transocean for the acquisition of 15 high-specification jack-up rigs.
The transaction consists of Transocean’s entire jack-up fleet, including ten rigs already in the fleet and five newbuilds under construction at Keppel FELS Limited, which Transocean has been postponing for a while now. The latest agreement with Keppel entailed the deferral of the five new jack-ups until 2020. Continue reading
It is quite difficult to find a book that explain about oil and gas industry to our children. There are many times that you are asked about oilfield by your kids and you could not find the good resource to explain them. Today we would like to share one of the best and simple oilfield books for kids. This book is “I need to know – An Introduction to the Oil Industry & OPEC“. An introduction to the Oil Industry and OPEC tells the story of oil. It tells how crude oil – or, using its more technical term, petroleum – was discovered, how it is explored and taken from the ground and made into other products.
The contents in this book are well written into simple language in order to explain about oilfield to young generations around the world. Not only is it good for children, it is also excellent to educate people who do not know much about oil and gas industry. The contents in this book are listed below; Continue reading
Nowadays, many wells required complex well trajectory plans in order to reach reservoir sections and some of complicated well paths (Figure 1) cannot be drilled with either rotary drilling assemblies or mud motors. In order to achieve the drilling goal, rotary steerable tools are usually selected.
Figure 1 – Complex Well Paths
While the precise mechanics might vary, each rotary steerable tool uses much the same approach. Running the rotary steerable immediately above the bit serves as a sort of replacement for a near bit stab (NB stab). Most tools use three blades close to the drill bit, which act as stablizers and move in and out. While the tool turns, the blade which is turning in the opposite direction pushes against the side of the hole, giving the necessary side force to create a curved hole while drilling.
When using a steerable motor, the adjustment of the well path a series of slide drilling and rotary drilling doesn’t give a clean smooth edge, but rather creates a hole with multiple sharp edges, and straight sections between them. A rotary steerable tool, on the other hand, does give a smooth curved hole. This makes the wellbore more stable, and less resistant when tripping in and out of the hole. With higher inclinations, a smooth curve makes for an easier job of running casing or logging tools. Continue reading
Rotary drilling assemblies can typically control a directional of a well by having proper stabilizer placement. With this kind of drilling assembly, only inclination can be controlled and a well cannot be directionally oriented to required direction. In this article, it briefly describe how stabilizer placement can affect the well direction.
Rotary Build Assembly (Fulcrum Assembly)
When a drill collar is supported at both ends but not held vertically, its own weight causes it to sag in the middle. This phenomenon is used in rotary drilling assemblies to create the necessary side force at the bit to alter the angle (Figure 1).
Figure 1 – A build rotary assembly
A positive displacement motor (PDM) is one of the most popular tool for drilling a directional well. It works by boring downwards and pumping mud through the motor itself. As shown in figure 1, the bottom section of the motor has an adjustable bend housing.
Figure 1 – Positive Displacement Motor (Courtesy of Schlumberger)
Before the motor is run into the hole, a set-up process needs to be carried out
- The bend will be adjusted according to the directional performance that the motor needs to achieve. This bend is only very slight, usually being under 2°.
- The motor is hooked up to navigational tools, which are then calibrated, in order for the driller to see where the bend is pointing when drilling. These tools are known as measurement while drilling, or MWD, and are described in detail later in this document.
- The other parts of the system will be adjusted to account for the required directional performance- the severity of this will depend on the drill design.