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Highly-permeable formations can be a challenge to properly cement and ensure zonal isolation. In Colombia, an operator encountered highly-permeable sand zones, increasing the chances of downhole losses and safety risks.

The key objectives were to assess the situation and provide recommendations prior to running the production liner on the next well in the field. The operator chose to consult with Baker Hughes, a GE company (BHGE), to provide a thorough assessment of previous jobs as well as run simulations to optimize cementing operations for improved performance and to achieve proper zonal isolation.

After reviewing cement evaluation logs on previous wells, it was determined that cementing was affected in front of a highly permeable formation. In addition, the review of a cement evaluation log in preparation for the production liner showed good cement just above and below the target zone. Based on these challenges, BHGE recommended the implementation of its newest cement spacer system, the SealBondTM Ultra.

BHGE’s SealBond portfolio of cement spacer systems has been an industryleading flagship technology for more than a decade. Its latest advancement, the SealBond Ultra cement spacer system is an ultralow invasion spacer technology designed to prevent losses while cementing. With nearly double the sealing ability of previous systems, SealBond Ultra mitigates permeable formations by sealing large natural fractures as large as 1 mm in order to effectively cement the well and provide effective zonal isolation.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Highly permeable sand zones and openhole washout sections
  • Efficient interaction time required between cement slurry and formation fluids
  • Historical cement quality issues experienced in previous wells near zones of interest

Results

  • Enabled effective zonal isolation against target zones, confirmed with cement evaluation log
  • Sealed highly permeable formation during cementing
  • Zero incidents associated with the application