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A customer operating in the Clearwater area of Alberta, Canada was preparing to complete an extended-reach well in the Cardium formation. With a lateral length of 9,925 ft (3,025 m), the well offered considerable reservoir access, and would require a multistage completion solution that could deliver the right balance of reliability and reservoir contact. Additionally, the customer wanted to keep costs low, and needed the solution to be economical, without sacrificing performance.

Based on these requirements, Baker Hughes, a GE company (BHGE), recommended the BLITZ™ coiled tubing (CT) frac sleeve system. Comprised of a new generation sleeve design and a rugged, resettable BLITZ annular frac packer, the system is more robust and reliable than other CT systems, and enables treatment of nearly an unlimited number of stages. These benefits would be key in completing the almost 10,000-ft (3,048-m) lateral which had four known doglegs with severity greater than 10°/100 ft (10°/30 m).

The completion design called for a BLITZ single-shift CT sleeve to be installed every two joints of casing, for a total of 134 sleeves across the lateral section. Once the sleeves were installed and cemented into place, the BLITZ packer bottomhole assembly (BHA)—which included a disconnect, blast joints, a perforator with a customized nozzle flow area, and pressure/temperature gauges—was run to the toe of the well without issue. Because the packer BHA can withstand annular flow rates up to 70 ft3 /min (2 m3 /min), it is ideal for extended-reach applications where tools may need to be pumped down to bottom.

During fracturing operations, the packer was moved from one sleeve to the next with efficiency and ease. Unlike any other CT fracturing solution, the BLITZ packer BHA includes a collet locating system that provides a positive weight indication when each sleeve has been engaged, as well as when it has been shifted. This allowed the BHGE team to manipulate the downhole the tools with precision, ensuring proper BHA spacing and depth throughout operations. In the toe section, the sleeve-to-sleeve move time averaged 9.5 minutes, and shortened to 6.5 minutes towards the heel, with the fastest move time clocked at only 4.5 minutes.

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Challenges & Results
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challenges

  • Extended-reach lateral section measuring 9,925 ft
  • Multiple doglegs with severity greater than 10°/100 ft
  • Tight formation requiring aggressive treatment rates and pressures
  • Customer needed a fast, economic solution to stimulate more than 100 stages

Results

  • Delivered treatments to 134 stages in only 151.5 hours
  • Deployed the tools to TD and shifted all sleeves with zero NPT
  • Achieved an average stage-to-stage move time of 8 minutes
  • Ensured proper BHA spacing and depth throughout operations
  • Recovered quickly from five screenouts
  • Enabled aggressive pump rates and pressures to maximize treatment effectiveness