Selecting a lower completion method is often difficult to evaluate because the true time/cost savings is unknown. This is usually due to the lack of an “apples to apples” comparison. Five (5) wells and four (4) different lower completion types were performed in the Longhorn development (All were performed in the same pressure/temperature regime, similar depths and utilized the same rig). This paper will review the lower completion case histories of this development. The completion types included a conventional single (2 trips), a 1 trip system, a conventional stacked pack (2 zones) and a multizone single trip system (2 zones).

This paper will review, compare and document four (4) different lower completion types. Application of the results should help every completion engineer; answer the question “What lower completion method should I use?” The following time savings, normalized with no non-productive time, were as follows:

  • One trip savings was 1½ days less than a conventional single (2 trips).

  • Multizone Single Trip Systems (MST1 ) (two zone) was only 0.5 day longer than a conventional single (1 zone) which is equivalent to the second zone pumping time.

  • MST time savings was four (4) days less than a conventional stacked pack (two zones).

Choosing the correct completion technique is the primary objective of every completion engineer. Understanding the risks and costs associated with each completion type is essential in performing this task.

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