1. vb. [Drilling]
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To add a length of drillpipe to the drillstring to continue drilling. In what is called jointed pipe drilling, joints of drillpipe, each about 30 ft [9 m] long, are screwed together as the well is drilled. When the bit on the bottom of the drillstring has drilled down to where the kelly or topdrive at the top of the drillstring nears the drillfloor, the drillstring between the two must be lengthened by adding a joint or a stand (usually three joints) to the drillstring. Once the rig crew is ready, the driller stops the rotary, picks up off bottom to expose a threaded connection below the kelly and turns the pumps off. The crew sets the slips to grip the drillstring temporarily, unscrews that threaded connection and screws the kelly (or topdrive) into the additional joint (or stand) of pipe. The driller picks that joint or stand up to allow the crew to screw the bottom of that pipe into the top of the temporarily hanging drillstring. The driller then picks up the entire drillstring to remove the slips, carefully lowers the drillstring while starting the pumps and rotary, and resumes drilling when the bit touches bottom. A skilled rig crew can physically accomplish all of those steps in a minute or two.
See: joint, kelly, mousehole, slips, stand, top drive
Nov 28,
Drill pipe connections are crucial components in drilling operations, providing the link between drill pipes. Various types of connections are used in the oil and gas industry based on specific drilling requirements. Here are some common drill pipe connections.
REG (Regular Style Connection):
The regular style connection is utilized to join inner upset drill pipes, resulting in a configuration where the drill pipe diameter is smaller than the inner diameter of the thickened portion. The main application of the API-designed regular style connection is in bit connections. Due to the placement of the drill bit at the end of the drill string, the stress concentration phenomenon in the thread is not a significant concern. Consequently, API has retained all specifications for this connection type.
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IF (Internal-flush Style Connection):
The internal-flush style connection is employed to connect externally upset (EUE) or inside and outside thickened drill pipes. This creates a drill pipe joint with an inner diameter equal to or approximately equal to the inner diameter of the thickened or outside pipe. The specifications for this type include a V-0.065 flat top and bottom triangular tooth design, with a width of 0.065 inches (1.651mm). Due to the potential stress concentration associated with this type, API has gradually phased it out.
FH (Full-hole Style Connection):
The full-hole style connection connects inside and outside thickened drill pipes, resulting in a drill pipe joint with an inner diameter equal to the thickened end diameter, both of which are smaller than the inner diameter of the pipe. Despite having fewer thread specifications, it offers three models named V-0.065, V-0.05, and V-0.040, making it widely used in kellys, drill pipes, drill collars, and drilling operations.
NC (Numbered Connection):
For drill pipes with a minimum yield strength of 75,000 PSI or greater (high-strength), the API recommends a numbered connection, or NC. NCs are designed to connect pins and boxes with matching thread designations, and they are largely interchangeable when grade codes match. The thread pitch and type compatibility are crucial factors for interchangeability. Numbered connections range from NC10 to NC77, featuring varying intervals with corresponding inner and outer diameters. Checking with the tool joint manufacturer is advisable to ensure compatibility of NC and thread types.
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