SPE Drilling & Completion
Volume 25, Number 2, June 2010, pp. 248-252

SPE-110040-PA

Different Methods To Avoid Annular Pressure Buildup by Appropriate Engineered Sealant and Applying Best Practices (Cementing and Drilling)

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DOI  More information 10.2118/110040-PA http://dx.doi.org/10.2118/110040-PA

Citation

  • Tahmourpour, F., Hashki, K., and Hassan, H. 2010. Different Methods To Avoid Annular Pressure Buildup by Appropriate Engineered Sealant and Applying Best Practices (Cementing and Drilling). SPE Drill & Compl  25 (2): 248-252. SPE-110040-PA. doi: 10.2118/110040-PA.

Discipline Categories

  • 1 Drilling and Completions
  • 1.5 Completion Planning, Design and Installation
  • 1.5.1 Formation Isolation

Keywords

  • sand control, openhole gravel pack, horizontal well, synthetic fluid, field application

Summary

Many wells that have been successfully cemented initially are showing annulus pressure buildup because of damaged cement-sheath integrity by post-cementing operations/conditions. This has been a concern by many operators where wellbores may be exposed to severe conditions and/or production regimes over a period of time. Sometimes this problem can be temporarily dealt with by releasing the annulus pressure, if environmental conditions and well type will allow. However, this method of annular gas production relief is not a long-term solution to the problem. In addition, it is not always possible to reduce the annulus pressure by releasing the trapped pressure into the environment on a regular basis, even if all other conditions permit this operation. An engineered cement-slurry system can save the operator from facing this situation by applying a lifetime zonal isolation remedy through the proper cement job design.

Gas injection in specific areas in the UAE is performed to help maximize the production from these development fields. This paper will discuss the process of engineering a cementing system for these gas-injection wells and the development of a solution that has successfully protected wellbores in gas-injection areas where high pressures are applied to the wellbore. By treating the cement under defined wellbore conditions and studying the mechanical behavior of the cement sheath, it was possible to design a cement-slurry system that could withstand the high pressures applied through gas-injection operations. The mechanical behavior was evaluated using 3D finite element analysis (FEA) that considers mechanical properties such as Young’s modulus, Poisson’s ratio, and tensile strength in addition to confined compressive strength. The importance of complete zonal isolation is of high order. Elastic cement designs have provided a resilient nonfoamed, or conventional, system that successfully isolated the wellbores for more than a dozen gas-injection wells.

© 2009. Society of Petroleum Engineers

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History

  • Original manuscript received: 10 August 2007
  • Meeting paper published: 11 November 2007
  • Revised manuscript received: 19 January 2009
  • Manuscript approved: 10 February 2009
  • Published online: 17 September 2009
  • Version of record: 14 June 2010