Tool joints are screw-type connectors that join the individual joints of drillpipe. Several types are widely used (Fig. 15-3):
IEU (internal-external upset) Tool joint is larger than the pipe such that the tool joint ID is less than the drillpipe. The tool joint OD is larger than the drillpipe. Generally,
I Eli connections are the strongest available couplings.
Tool joint ID is approximately the same as the drillpipe. The OD is upset. Tool joint ID is less than the pipe. Tool joint OD is approximately the same as the pipe. This type is often termed "slim-hole" pipe because of the reduced outer clearance.
Joint strengths of the couplings are included in the Appendix. An important note about tool joints is that they are designed to be run in tension.
Complete coupling dimensions will not be presented in this text. For further details, consult API Specification 7.
Hardfacing, or hardbanding. tool joints has become a common practice in the drilling industry. To minimize tool joint wear while rotating on abrasive rock, a band of abrasion-resistant materia) is applied to the outside of the box tool joint (Fig. 15—3). This material is usually sintered tungsten carbide particles in a welded metal matrix. The problem that often arises from the use of hard faced tool joints is excessive wear on the internal diameter of the casing.
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