SPE Drilling & Completion
Volume 25, Number 2, June 2010, pp. 199-209

SPE-116541-PA

Challenges in Completing Long Horizontal Wells Selectively

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DOI  More information 10.2118/116541-PA http://dx.doi.org/10.2118/116541-PA

Citation

  • Abbasy, I., Ritchie, B., Pitts, M., White, B., and Jaafar, M.R. 2010. Challenges in Completing Long Horizontal Wells Selectively. SPE Drill & Compl 25 (2): 199-209. SPE-116541-PA. doi: 10.2118/116541-PA.

Discipline Categories

  • 1.5 Completion Planning, Design and Installation
  • 1.4 Drilling Equipment and Operations
  • 1.3 Wellbore Design/Construction
  • 1.6 Intelligent Completions

Keywords

  • selective, completion, horizontal, surface-controlled, Q-CAJ

Summary

Although drilling technology is now able to deliver ultra long horizontal wells (LHWs), completion technology has been slower to evolve. Running long liners, effective stimulation, and completions are some of the areas that require more attention. This paper discusses some of the challenges in the development of the Al Shaheen reservoirs offshore Qatar and how they were overcome. Some of these wells have a stepout in excess of 30,000 ft with a total vertical depth of 3,100 to 3,500 ft, and thus, they offer some unique challenges. Running and cementing liners to these depths is difficult, and some of the methods to achieve this effectively are discussed. Perforating guidelines are presented that allow sand control without having to resort to conventional sand-control practices. Stimulation of such long reservoir sections is a particular challenge, and a fine balance must be struck between acid coverage and cost, both for barefoot and perforated intervals. The so-called Q-CAJ technique of acid distribution, which has allowed acceptable stimulation despite these conditions, is presented. The technique also offers opportunities to stimulate long horizontal boreholes more effectively and at lower cost. Some of the wells are completed with multizone selective completions, which push the design limit of equipment. A number of such intelligent wells have been completed successfully, and more aggressive wells are planned. To optimize the development cost, dual-lateral wells have also been drilled with complete control over each lateral. Discussed are some of the underlying completion techniques such as running completion in stages, use of mechanical latches, hydraulic-control-line wet connects, interval control valves, and limitations imposed by control lines. The paper concludes with some of the challenges that have yet to be overcome.

© 2010. Society of Petroleum Engineers

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History

  • Original manuscript received: 15 July 2008
  • Meeting paper published: 20 October 2008
  • Revised manuscript received: 7 May 2009
  • Manuscript approved: 25 September 2009
  • Published online: 25 February 2010
  • Version of record: 14 June 2010