A Practical Approach to Casing Wear Prediction, Modeling and Mitigation on Challenging ERD Wells
- Weifeng Dai (ConocoPhillips Alaska, Inc) | Brian Noel (ConocoPhillips Alaska, Inc) | Chip Alvord (ConocoPhillips Alaska, Inc) | Johnson Njoku (ConocoPhillips Alaska, Inc) | Joey Hopper (WWT International) | Lee Smith (Alaskan Energy Resources, Inc)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 24-26 September, Dallas, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 7.2.1 Risk, Uncertainty and Risk Assessment, 1.7.2 Managed Pressure Drilling, 1.6.6 Directional Drilling, 7.2 Risk Management and Decision-Making, 1.6 Drilling Operations, 7 Management and Information, 1.7 Pressure Management, 1.10 Drilling Equipment
- analysis, ream-while-drilling RWD, casing wear, extended-reach wells, torque reduction
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- 487 since 2007
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Casing wear caused by rotating drill strings can lead to reduced well life, failed or burst casing strings, and expensive non-productive time (NPT) for remedial actions. In Alaska's Alpine Development field, where logistics are challenging, regulations are strict, and the operational window is small, drilling increasingly long laterals has vastly increased the cost and risk of casing wear, necessitating effective mitigation.
After detailed analyses of Alpine field wells, one operator successfully implemented a casing wear mitigation plan combining new tools, modeling techniques and analyses. The plan required strategic placement of Non-Rotating Protectors (NRPs) based on predicted casing wear, analyzed side forces, and lateral length. Additionally, the operations group wanted to simultaneously improve computer modeling for both casing wear and torque and drag (T&D) analysis.
One major challenge was predicting appropriate wear factors for casing wear modeling. Operational challenges included how to deploy the plan in managed pressure drilling (MPD) operations, where preventing premature wear on rotating control device (RCD) sealing elements had to be considered.
Implementing this casing wear mitigation plan allowed the operator to successfully drill extended reach multilateral wells to planned total depth while keeping wear below maximum allowable thresholds. The paper describes the challenges and approach to predict casing wear, as well as successful mitigation strategies and lessons learned from an extensive offset database. Included are comparisons to field results from casing logs, and several wells that deployed the casing wear mitigation plan, versus an offset well that was drilled without a plan.
The paper describes new techniques for predicting and modeling casing wear which, in combination with utilization of specific tools, results in a readily-applicable approach to wear mitigation in extended-reach drilling (ERD).
|File Size||1 MB||Number of Pages||12|
"Alaska operators start Alpine field, take more leases," Oil&Gas Journal, Vol.98, issue 49; https://www.ogj.com/articles/print/volume-98/issue-49/exploration-development/alaska-operators-start-alpine-field-take-more-leases.html; link accessed 04/2018.