These are some footage showing some oil drilling rigs were blown out and got fired. I would like to share these VDO clips to raise awareness of well control.
Oil Rig Blowout
Chesapeake Energy Nomac Rig 17 Blowout Fire
We would like to present some drilling knowledge in the new form. Therefore, this time we’ve created the cartoon in the topic of Types of Drilling Rigs (Both Offshore and Onshore).
Please feel free to give us any recommendation.
When cement is in transition period (forming the bond), you will lose some hydrostatic pressure because cement becomes solid phase, therefore only water in the cement will provide hydrostatic pressure. In many cases happened, there is no issue while performing the cement job, however; once the cement is set after period of time, there is a casing pressure indicating that there is hydrocarbon in the annulus.
This example will demonstrate you why the well is in underbalance condition while waiting on cement.
Well information: Previous 9-5/8” casing shoe at 4000’ ft.
The vertical well (8.5” hole) is drilled to TD at 10,000ft with 12.1 ppg mud and the pay zone is at 9,800’ TVD with reservoir pressure of 11.6 ppg. The cement is planned to cover 3,500 ft in the annulus above the casing shoe. Water used to mix cement is 8.3 ppg weight.
In the previous topic, we discuss about the annular preventer and today we would like to give you more details regarding ram preventers. The ram preventers were invented by James Smither Abercrombie and Harry S. Cameron in 1922.
This preventer consists of two rams which extend into the center of the wellbore in order to shut the well in (see the image below). The ram preventers can be hydraulically or manually operated. When people would like to shut the well in using the ram preventer, they will go to the hydraulic option first. If the hydraulic is not properly operated, the manual system will be utilized.
In order to provide the wellbore sealing, the rams must compose of top seals and packers which are made of the special elastomer. For more understanding, please take a look at the diagram of Cameron BOP below.
(Courtesy of Cameron)
When the well is shut in, the packer will seal around drillstring or tubular and the top seal will be pushed against the BOP body. With both top seals and packer, the well is securely shut in when
In the drilling industry, there are four types of rams preventers which are Pipe Rams, Variable Bore Rams (VBR), blind rams and blind-shear rams.
I’ve got the excellent presentation in the topic of Floating Drilling from Texas AM. This is very useful for many people in the drilling business.
Please check out the following links to download them.
Offshore Drilling
http://www.pe.tamu.edu/schubert/public_html/PETE%20406/Floating%20Drilling/406%20Lesson%208.ppt
