... after the riser was landed on the well; this eliminated the CT pipe clashing with the V-door during landing joint deployment and eliminated CT reel cycling due to heaves during standby. A rail system inside the CTTF converted from CT to wireline operations in under 3 hours with no crane nor winch...

... strains the pipe causing plastic, or low cycle, fatigue damage. When the coiled tubing is connected to the wellhead, the environmental loading causes elastic stress cycles, resulting in elastic, or high cycle, fatigue damage. There are numerous methods to determine the fatigue life from either plastic...

... discontinuities. The majority of this research has been conducted by placing defects in new tubing samples and cycling to failure. However, tubing in the field often incurs mechanical defects later in life, after fatigue damage has already accumulated due to prior cycling of the tubing in a defect-free state...

... installation and operations internal pressure procedure cycling upstream oil & gas annular velocity life consumption pump pressure strength stress distribution tensile strength record depth coiled tubing sand flopro-ct 1 objective society cleanout fatigue cycling test string petroleum...

... the utilization of the pipe while minimizing the chance of pipe failure. The problem of CT fatigue has been studied extensively in the lab, using constant pressure bend cycling and/or axial coupon testing. However, models resulting from experimental programs have seldom been correlated in the literature with CT...

... & disposal mud pulse cycling Alaska CTD Program Over 250 through tubing coil sidetracks have been drilled in Alaska since 1994. Over time coiled tubing drilling has evolved into a routine operation in the Prudhoe Bay Field ( 1 , 2 , 3 , 4 ) . 62 wells were drilled in 2001 in Alaska with plans...

..." non-cycled CT. Specimen No. 2 is the same tubing cycled at 2000 psi to 70% of its fatigue life. The measured changes in material and physical properties that are shown in Table 2 have resulted in a loss of collapse strength from 16978 psi to14382 psi or a reduction of 15.3%. Specimen No. 3...

... Abstract In recent years, the performance envelope of coiled tubing (CT) has expanded because of improvements in tubing manufacture and the prediction of low-cycle fatigue life. More accurate life predictions have been achieved with data from laboratory-scale and full-scale CT fatigue tests...

...) loading. A portion of plastic strain, not recovered in each cycle, may lead to large accumulated plastic strains. A new analytical model capable of predicting ratcheting behavior of this type has been developed and applied to coiled tubing. The model predicted interesting trends, never before noted...