Coupling procedure modification improves sealing integrity of API connections

Journal Article · Mon Apr 04 00:00:00 EST 1983 · Oil Gas J.; (United States)

OSTI ID:5527986

Chelette, K D; Bollfrass, C A

This paper presents and recommends a pipe coupling procedure which provides several new options for improving the pressure sealing integrity of APILTC and Buttress casing connections. The combination of close tolerance control of taper and multiple tapers along the coupling thread length will ensure proper thread engagement and interference to produce the necessary surface contact pressures to seal and rate the coupling at the API pipe body internal yield pressure without the increased coupling OD values that will otherwise be required. The taper control of the first few threads of the coupling together with the steeper taper in the region of the pipe end, power-tight position ensures that sealing will occur at the extremes of the engaged thread length. This will exclude well bore pressures from the threaded region, thus reducing a tendency for jumpout at tensile loads less than the rated tensile failure load. The close taper tolerances and steeper taper section of the coupling will introduce a new capability to control the location of the final assembly position of the pipe in the coupling, providing for positive positional control of assembly without turn measure equipment.

• Research Organization: Thread Technology International, Houston, Texas
• OSTI ID: 5527986
• Journal Information: Oil Gas J.; (United States), Vol. 81:14
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
THREADED JOINTS
DESIGN
INSTALLATION
WELL CASINGS
DYNAMIC LOADS
MODIFICATIONS
SEALS
TECHNOLOGY UTILIZATION
TENSILE PROPERTIES
WELL PRESSURE
JOINTS
MECHANICAL PROPERTIES
RESERVOIR PRESSURE
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030300 - Natural Gas- Drilling
Production
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