All drilling rigs have the Blow Out Preventer because it is a mandatory equipment for well control, therefore personnel who has work relating to drilling operation must learn about the BOP. Learning via VDO training gives you several advantages as clear descriptions with relating images, etc so learners can learn faster and get correct massage.
This VDO below teaches about the BOP and we also provide the full VDO transcript as usual to accelerate learning capability.
BOP equipment is one the most critical equipment for well control operation. Learning about it via VDO training is a good way to understand this subject because you can see what the equipment look like, how these equipment relates to the operation. This VDO will teach you several topics about the BOP equipment as BOP stack, choke manifold, choke panel, accumulator, etc. Additionally, the full VDO transcript is provided to aid your learning.
Nowadays, deepwater drilling is one of the important parts of drilling in the world and there are a lot of ongoing deepwater operations. Our team will start focus on subsea well control and this topic is about hard shut in procedure while drilling with a subsea stack. This is quite similar to surface stack but it is quite tricky how you space out the well properly because the BOP is way down below approximately thousand feet from sea surface.
There are 3 steps which are space out, shut down and shut in and the details for the procedure are below.
There are several API types of ring gaskets used in BOP connections and this is very important to personnel involving in drilling operation to know about it. API 6A: Specification for Wellhead and Christmas Tree Equipment is the standard which every manufacture refers to their equipment.
The API type “R” rig gasket is not a pressure energized gasket therefore this type does NOT recommend for BOP equipment or safety critical equipment as x-mas tree, wellhead valves, etc. Sealing area is along small bands of contact between the gasket and the ring gasket on both ID and OD of the gasket. Shape of type “R” may be oval or octagonal in cross section (see Figure 1). Additionally, face to face between flanges will not touch when the flanges are tightened (see Figure 2). The “R” gasket is compatible for 6B flanges.
Figure 1 – Type R ring gaskets (shape and groove)
Figure 2 – Type “R” Gasket When Energized
People asked me about what the closing ratio is and what it tells us. Closing ratio is defined as the cross sectional area of the ram piston (cylinder) divided by the cross sectional area of the ram shaft. The closing ratio is used to determine Ram closing pressure which will overcome wellbore pressure acting to Ram body. The closing ratio formula is below;
Before going into the detailed calculation, we would like to show you where the cylinder and the ram shaft are in BOP. In Figure 1 (Shaffer SL-Ram BOP), the yellow shaded parts demonstrate these two areas which will be used to calculate the closing ratio.
Figure 1 – Shaffer SL-Ram BOP
Detailed Formulas are as follows;
Ram Piston Cylinder Area (square inch) = ( π× Ram Piston Cylinder Diameter2 ) ÷ 4
Ram Shaft Area (square inch) = ( π× Ram Shaft Diameter2 ) ÷ 4
Closing Ratio = Ram Piston Cylinder Area ÷ Ram Shaft Area
Figure 2 – Diagram of Closing Ratio Calculation
