Zonal isolation achieved with cement remains fundamental to well integrity for the full well life cycle. As I read through the abstracts and papers that have been presented in the past year, I notice several key themes: verification of cement placement, development of new materials as a barrier, development of new additives to improve the cement barrier, and enhancement of existing techniques. The fact that we are still studying and improving the cement barrier underscores how important it is as wells are pushed to new limits.
Cement-job-performance indicators are critical. From our surface observations, surface sensors, and equipment performance, we can anticipate where zonal isolation is expected. With a robust cementing process embedded in the drilling process, we can be confident in the placement of the barrier. Paper SPE 188295 includes a very complete case history.
Many efforts have been made relating to measurement of the outcome of cement jobs. New, more-powerful logging tools; better algorithms; and novel explanations are explored for each scenario that we can imagine. Paper SPE 188274 includes an excellent summary of today’s state of the art.
Our industry continues to challenge drillers to push to new limits, which requires cementing technology to reach those same limits so that annular isolation can be achieved in every well that is drilled. Extended-reach wells are reaching new lateral-reach records. Managed-pressure drilling is a technique that is spreading, which logically leads to the need for managed-pressure cementing (MPC). Paper OTC 28139 includes a case history of MPC in deep water.
Zonal isolation continues to be enhanced. The recommended additional reading provides an insight into a few of these enhancements, including abandonment practices, reverse cementing, and nanotechnology.
This Month's Technical Papers
Recommended Additional Reading
SPE 185938 Perforate, Wash, and Cement (PWC) Verification Process and an Industry Standard for Barrier-Acceptance Criteria by Laurent Delabroy, Aker BP, et al.
OTC 27864 Development and Validation of a Hydraulics Simulator for Estimating Subsurface Reverse-Cementing Placement Pressures by C. Wreden, Weatherford International, et al.
OTC 27893 Development of Nanotechnology Pipe Treatment To Improve Acoustic Cement Evaluation by James Heathman, Shell International Exploration and Production, et al.
Gunnar DeBruijn, SPE, Principal Instructor, Schlumberger
01 May 2018
Integrated Approach to Well-Leak Diagnostics Meets Success Offshore Timor Sea
This case study discusses the methodology that underlies the successful determination of the depths and the radial locations in the outer casing strings of multiple leaks in an offshore well.
Personnel Benefit From Advanced Drilling Simulators for Well-Control Training
This paper focuses on the preparation for, and implementation of, well-control training, while highlighting the integration of people skills into curricula and what advantages operators and drilling contractors have obtained.
Snubbing Unit Brings Middle East Well With Underground Blowout Under Control
This paper describes the mobilization of a snubbing unit and blowout preventer (BOP) stack in the Middle East that enabled a well with an underground blowout and surface broaching to be brought under control within a short time.
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16 January 2020
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