Coiled Tubing NDT Inspection: Implementation, Experience and Results

Macarthur, Jim; Shearer, C.; Crabtree, Alexander R.; Nelson, R.D.

doi:10.2118/56940-ms

Cited by 15 publications

(7 citation statements)

References 11 publications

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“…For comparison purpose against FEA and testing results, the current work will use the normalized analytical results, to study the spatial characteristics of MFL. Numerical methods were used for the integration of Equations (4), (5), and (6).…”

Section: Methodologiesmentioning

confidence: 99%

“…Often, the tubing integrity and service life are severely impacted by all sorts of physical damage to the pipe, such as dent, scratch, gouge, cut, corrosion pit, etc [1][2][3] . Nondestructive evaluation (NDE) of CT strings in service has been used routinely in recent years [4][5][6][7][8][9] . Rosen 4 presented such an inspection system in 1998.…”

Section: Introductionmentioning

confidence: 99%

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Steel Coiled Tubing Defect Evaluation Using Magnetic Flux Leakage Signals

Liu

Minerbo

Zheng

2014

Day 2 Wed, March 26, 2014

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Mechanical defects, such as manufacturing imperfections, grinding marks, corrosion pits, slip marks, kinking, gouges, etc, whether occurred in the factory or in the field, can be readily found on CT strings. Extensive studies have demonstrated the detrimental effects of mechanical defects, over the integrity of the coiled tubing, both in the lab and in the field. Researchers in the field have been proposing theoretical models for the severity assessment of mechanical defects, particularly as it relates to the remaining fatigue life. For such models, the defect sizing is usually a prerequisite. In order to improve coiled tubing pipe management, it is important to assess the size of a defect, and its severity.MFL (magnetic flux leakage) based devices are volumetric and non-contact technology that is now commercially available for inspection and monitoring of CT strings. These devices have been demonstrated to be sufficiently sensitive in identifying mechanical defects. However, defect characterization and evaluation based on the devices' MFL signals is rarely seen. To fully utilize these MFL based inspection devices for coiled tubing pipe management, it is important to establish correlation between the MFL inspection signals and the geometry and severity of the underlying mechanical defects.The current work developed a three dimensional Finite Element Analysis (FEA) model to calculate magnetic flux leakage for mechanical defects on steel coiled tubing. The fidelity of the FEA model was verified against analytical and experimental results over a series of benchmark defects. By using the analytical and FEA models, parametric studies were performed to evaluate how the MFL signals are affected by various factors. The results were used to identify defect geometry features based on MFL signals. Physical limits behind these results were identified and analyzed. Ways to overcome such limits were proposed. Further, a novel approach was presented and validated to reconstruct three-dimensional MFL field based on a single MFL component measurement. The benefit of using multiple MFL components was demonstrated for defect characterization.

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Section: Methodologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Steel Coiled Tubing Defect Evaluation Using Magnetic Flux Leakage Signals

Liu

Minerbo

Zheng

2014

Day 2 Wed, March 26, 2014

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“…It is not enough to rely solely on a purchase specification to control pipe properties or to merely continue with normal operating practices. A complete system has evolved, and continues to evolve, from the experience gained by MacArthur et al, 1 and through the continual monitoring of the in-service strings. The management system currently adopted consists of the following five main parts.…”

Section: Sour Service-management Systemmentioning

confidence: 99%

“…Parts of these requirements are outlined by MacArthur et al 1 The Alberta Energy and Utilities Board (AEUB) began to extend the concepts noted in the above paper when considering approvals for the underbalanced drilling of critical sour wells. Work was jointly undertaken by several industry experts to develop an industry recommended practice (IRP) under the auspices of the Drilling and Completions Committee (DACC).…”

Section: Introductionmentioning

confidence: 99%

Coiled Tubing in Sour Environments: Theory and Practice

Crabtree¹,

Gavin²

2005

SPE Drilling &Amp; Completion

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Carbon steel coiled-tubing (CT) strings have been used in sour wellbore environments for many years. The use of CT in sour service has increased by job number, job complexity, pipe size, and the stresses to which the pipe is subjected. A number of papers have been written on the steel chemistry and low-cycle fatigue behavior. These papers have been based on both theoretical and laboratory work. Great progress has been made in understanding the chemical and physical interaction of CT and H 2 S, but little information is available from "real-world" situations in which the pipe has been worked in a variety of job types (e.g., acidizing, gas lifting, and drilling) and in which a large number of other factors may come into play (e.g., injector damage, well-stimulation chemicals, sour inhibitor application techniques, erosion of inhibitors, CO 2 , and high-chloride water production).This paper discusses the application of a CT technical specification (based on theoretical and laboratory work) in the operational world. Comparisons will be made between theoretical expectation and practical observation for 70-and 80-grade CTs with regard to low-cycle fatigue, pipe life, and damage in sour environments.

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“…The initial plan was to build robots that would carry non-destructive evaluation (NDE) sensors through small-diameter tubing and inspect them from the inside. It was thought that the coiled tubulars (1) might represent a relatively easy initial challenge, and then robots could be developed to go around tight bends, and crawl through valves, etc.…”

Section: Introductionmentioning

confidence: 98%