During the past several years, lean philosophies, methods, and techniques have been applied steadily and increasingly within the upstream segment of the oil and gas industry. Perhaps one of the more notable areas for this growth has been in unconventional well completions and field development with references to such endeavors as the “well factory.” In part, this has been focused on optimizing well and pad construction to establish a uniformity of processes and equipment. This allows a greater focus on elimination of the various forms of waste, as defined in lean concepts, to drive various efficiency gains.
However, applying these concepts to well interventions proves challenging. The coiled-tubing (CT) industry, like other well-intervention segments, has applied lean philosophies to some aspects of its management, operations, processes, and equipment. When it comes to CT application to specific in-well operations, no two wells are the same. Even though the operations may be nominally similar, well variables such as temperature, pressure, depth, and fluids can make it difficult to understand the cause and effect. The continued high activity level in the unconventional and shale well segments in the US has provided a unique opportunity to apply the scientific method to CT interventions because of a reduced number of variables and the fact that the plan/do/check/adjust cycle can be applied. Paper SPE 191689 exemplifies the use of the scientific method for in-well CT operations.
Another way to bring efficiency to operations is through the sharing or compounding of data to increase the sample group. Conflicts of interest or fair-competition concerns can make this approach difficult. One paper in the recommended additional reading list, SPE 194277, may offer a practical solution.
Part of the operational challenges for CT in unconventional wells is the lateral length that must be accessed. Paper SPE 194300 also shows that these challenges are being encountered similarly offshore and how they are being addressed. Additionally, the continued development of high-performance CT steels and work-string designs (paper SPE 194255) drives these significant enabling technologies in meeting the challenges.
The continuing general trend to operate with larger-diameter CT at higher tensile loads brings other operational issues, such as avoiding imparting mechanical damage to the CT’s surface by handling the equipment. Examining how the CT injector might be optimized by design, or by usage, from a finite-element-analysis and a mathematical perspective is discussed in paper SPE 194254 and introduces an interesting factor to the discussion. I am sure that there will be diverse opinions on this work.
This Month's Technical Papers
Recommended Additional Reading
SPE 194300 Highly Engineered 2.375-in. Coiled Tubing Provides Effective and Reliable Interventions on 30,000-ft Megareach Wells Offshore Abu Dhabi by Irma Galvan, Global Tubing, et al.
SPE 194277 Remote Monitoring and Modeling of Coiled-Tubing Operations in Real Time by Paul Brown, CoilData, et al.
SPE 192000 Rigless Intervention To Secure Internal Blowout Monitoring Gas Wells Offshore Brunei by Axemi Leong, Halliburton, et al.
|Alex Crabtree, SPE, is a principal engineer with Oceaneering International based in Houston. He has more than 36 years of experience in the upstream oil and gas industry. Crabtree holds a BS degree in mechanical engineering. He has worked in Southeast Asia, the Middle East, Europe, North America, and South America, both onshore and offshore. Crabtree previously worked with an exploration and production operating company and within the oilfield-services-company sector, holding various engineering and management posts in research and development, field operations, downhole-tool design, and technology implementation. He has authored several SPE papers and is a past program-committee chairperson for various SPE conferences and SPE Applied Technology Workshops. Crabtree is the chairperson for the SPE Well Integrity Technical Section, was an SPE Distinguished Lecturer in 2001–02, and is a member of the JPT Editorial Committee.|
Alex Crabtree, SPE, Principal Engineer, Oceaneering International
01 June 2019
Big Data vs. Diverse Data: Confidential Databases Lack Performance Benchmarks
A study by a real-time monitoring company showed that many coiled-tubing strings are retired with a lot of life left in them. It suggested companies could lower costs by using pipe for a longer time and could benefit from multicompany studies showing how their decisions compare to the competition.
In-Line Quench-and-Temper Technology Applied to CT Improves Safety and Reliability
This paper discusses the advantages of the in-line quench-and-temper (Q&T) process, which enhances overall CT life and reliability by producing tubing with more-uniform microstructure throughout its entire length, increased material strength, and improved bend-fatigue performance.
Study Explores Mechanisms of Surface Damage on Coiled Tubing
In this paper, the authors study the stress status of CT string held by gripper blocks, the axial force distribution of gripper blocks, and the longitudinal resonance of CT strings in vertical wells.
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