Tag Archives: blow out preventer

Blow Out Preventer (BOP) Equipment VDO Training

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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.

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Basic Blow Out Preventer – VDO Training

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Blow Out Preventer is one of the most critical equipment on the rig therefore it is very important that you need to understand it. This VDO demonstrates the basic of BOP with a lot of colorful pictures which will help you learn about it. We also add full VDO transcript in order to help people fully understand this topic. We wish you would love this.

Full VDO Transcript Deails

BOP-basic-fb

The blowout preventer, BOP stack, consists of several large valves stacked on top of each other. These large valves are called blowout preventers. Manufacturers rate BOP stacks to work against pressures as low as 2m000 pounds per square inch or psi and as high as 15,000 psi. That is about 14,000 kPa to over 100,000 kPa.

Rigs usually have two kinds of preventers, on top is an annular preventer it is called an annular preventer because it surrounds the top of the well bore in the shape of a ring or an annulus. Below the annular preventer are ram preventers. The shutoff valves in RAM preventers close my forcing or ramming themselves together.

The choke line is a line through which well fluids flow through the choke manifold when the preventers are closed. Even though the preventers shut in the well the core members must have a way to remove or circulate the kick in the mud out of the well. When the BOP shut in the well, mud and formation fluids exit through the choke line to the choke manifold. The manifold is made up of special piping and valves. The most important valve is the choke.

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What is Closing Ratio in Blow Out Preventer (BOP)?

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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;

Closing Ratio = Ram Piston Cylinder Area ÷ Ram Shaft Area

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

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

Figure 2 – Diagram of Closing Ratio Calculation

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