Drill pipes come in different types, sizes and forms, but they all have the same purpose -- to drill oil. Various tools or components are required to make a drill pipe function properly. Finding the right tools for your drilling equipment will never be an issue because there are several heavy-duty manufacturers that specialise in making these components.
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Heavyweight Drill Pipe
Heavyweight drill pipe is produced from 4145H MOD quenched and tempered (Q&T) steel and manufactured with a hardness range of 285-341 Brinell Hardness Number or BHN. To provide longer fatigue endurance, the connections for the heavyweight drill pipe are "cold rolled" and are also phosphate coated to maximise resistance against galling. The connections come in spiral or conventional design.
A bit sub is used to put together drilling string that cannot be screwed together because of thread size or design variations. It is short in length and threaded all the way through to allow for easy threading of different components.
The Internal Blow Out Preventer, or IBOP, is a back-pressure valve with a main purpose to to prevent the well from flowing intractably up the drill string. Because it is manufactured from American Iron and Steel Institute (AISI) 4140/4145 alloy steel, the IBOP can withstand and handle the uncontrollable flow of oil easily.
DSTJ Tool Joint
The Double Shoulder Tool Joint or DSTJ connection has a smooth bore, which allows it to connect interchangeably with the API tool joint. This is possible due to the similarity of pin ID and box ID of the two joints. There are many great benefits in using a DSTJ tool joint, such as high-torque impedance, aptness for drilling in rancid environments and better hydraulic operation. As of this writing, the DSTJ has over 50 per cent market share in the oil industry and is largely used for oil rigging operation in the North Sea.
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