Transocean demonstrates an excellent animated video of the Deepwater Horizon incident. This video will show you what was happened to the Deepwater Horizon rig’s BOP and there are a lot of things that you can learn from this VDO as sequence of the incident, deep water BOP stack configuration, why the BOP elements were failed, force of high flow velocity, etc.
Please click at the image below to see the full VDO.
Please give me your thought about this VDO.
Many topics of driller’s method have been taught on the drillingformulas.com and I would like to summarize about advantages and disadvantages of driller’s method.
• Circulation can be established right away so the bottom hole pressure will not increase much due to gas migration.
• Influx can be removed out of the well even though the rig does not have sufficient amount of weighting agent.
• Gas migration is minimized.
• Operation is quite simple when compared to weight and weight method.
• Calculation is simple and drill pipe pressure schedule is not required.
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Slug is typically used to push mud in the drill string down therefore pipe will dry while pulling out of hole. Dry pipe while pulling out has some advantages as minimizing crew to expose to drilling mud when breaking a connection, reducing time to handle the drill string, etc. Sometimes, even you already pump slug but you still have wet pipe instead of dry pipe. You may wonder why the slug does not work very well.
The following reasons why the slug does not do its job are as follows:
• Slug volume is not enough to slug the pipe. Recommended volume is around 25- 40 bbl.
• You should chase slug by pumping mud at least surface volume from mud pump to a rotary table. Otherwise, you will not get desired slug volume in the drillstring because it is still left in the surface volume.
• Weight of slug is not sufficient. As a normal practice, the slug weight should have at least 2 ppg over your current mud weight.
• There is something inside the drill string so the slug could not push mud in the drill string down.
If you want to learn more about slug, please read the following articles:
What is slug mud? How much volume and weight of slug mud should be?
Barrels of slug required for desired length of dry pipe
Slow Circulation Rate is a circulation rate which will be used in well kill operation. Typically, slow circulation rate pressure (SCR) is recorded from each particular flow rate and the pressure represents pressure loss of the system while circulating. Since there are so many pressure gauges on the rig, you may get confused on the figures. In order to be at the same page for every personnel on the rig, the SCR should be recorded by the pressure gauge that we will use for killing the well.
There are a lot of reasons why we should kill the well with slow rate rather than a drilling rate as follows:
• To minimize friction pressure
• To allow time to weight up mud if you use wait and weight method
• To reduce pressure on surface equipment
• To allow degasser to separate gas from the mud
• To reduce needs for fast choke operation
• To allow personnel to think if something goes wrong
