What was happened? Kelly was bent.

We just got photo from our friend sharing these images of Kelly which was bent from parted drillstring.
This is the details.

While working the stuck drillstem using the kelly rig system, maximum tensile load applied on surface was about 375 Klb (170 tonne)  and the over pull was about 155 klb (70 tonne) and then the drill pipe was suddenly parted. This resulted in the Kelly to pop out of rotary table and the swivel bail came out of the hook. Therefore, the Kelly fail down freely because there was nothing to hold it. The equipment went down with the Kelly which was bent due to falling action from the rotary table to outside of the rig floor. Fortunately, nobody got injured from this incident.

Kelly-Bent-Over-From-The-Rotary-Table-1 Kelly-Bent-Over-From-The-Rotary-Table-2

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What is Kelly Rig?

This is the brief explanation of a Kelly rotating system on the rig. Kelly rig is on an old style rigs and  nowadays it is mostly used on land operations. For offshore operation, a top drive system is used instead.

First of all, it is important for new people to look at these images before reading the information below because they show the equipment’s name and where they are on the rig.

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Basic Knowledge of Kelly and Top Drive VDO Training

Kelly or Top Drive is the drilling equipment which transfer both rotational and compression force to the bit in order to make a hole. This vdo training demonstrates the basic understanding for kelly and top drive. Additionally, we add full transcript of this vdo in order to help people learn about this topic effectively. We wish you would enjoy watching and learning from this vdo.

Full Transcript of this multimedia training. 


Many pieces of equipment make up our Rotary drilling rig. Part of it’s on the surface and part of its underground or subsurface. All the equipment has one main purpose, to put a bit at the bottom of the hole where it can drill or make holes.

To put the big on the bottom, rig crewmembers screw it into a special pipe. The pipe is called the Drill String. Crewmembers lower the drill string and attached bit into the hole. For the bit to drill, surface rig equipment has to rotate it unless it’s rotated by a mud motor. Equipment also has to put weight on it to force the bit’s teeth cutters into the formation. As the bit rotates, a circulating fluid has to take the drill cuttings away from the bit. Otherwise the hole would clog up. This fluid which circulates is called drilling mud.

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