Investigation of API 8 round casing connection performance Part three: sealability and torque

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:5801850

Asbill, W T; Pattillo, P D; Rodgers, W M

The performance of the API 8 Round casing connection is investigated using 7''-29number/ft. pipe size. Part One showed that the finite element method was applicable for analysis using both a threaded and an unthreaded model. Part Two investigated the effects of various thread tapers and external loads on connection hoop stresses. It also evaluated maximum assembly interference based on an assumed criteria. Part Three addresses connection sealability based on contact pressure. Geometric end effects are found to be significant in the unthreaded model. Sealability in the middle portion predicted by hand equations is shown to be reasonable. The threaded model shows that tension reduces sealability by disengaging thread stab flanks. Assembly forces are analyzed and, along with the test results, are used to find an equation for torque. The effects of thread taper variations, tension, and pressure on torque are shown.

• Research Organization: Harry J. Sweet and Associates Inc., Houston, Texas
• OSTI ID: 5801850
• Journal Information: Am. Soc. Mech. Eng., (Pap.); (United States), Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Vol. 83-PET-18; ISSN ASMSA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
FINITE ELEMENT METHOD
JOINTS
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PERFORMANCE
SEALS
THREADED JOINTS
TORQUE
WELL CASINGS