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As fields mature, permeable formations can become depleted, leading to differential sticking, wellbore instability, and whole mud losses. If one or more of these were to occur, it could significantly add to the cost of any drilling program in terms of contingency liners, fishing or sidetracking, nonproductive time (NPT), or even having to abandon the well.

In a highly-reactive shale environment in Abu Rudeis, an operator used a conventional polymer system in their first year of drilling in attempt to address these issues. This resulted in low ROP and considerable fluid losses.

The operator contacted Baker Hughes, a GE company (BHGE), to provide fluid engineering support at the end of the first year of drilling. After a comprehensive analysis of the well, loss history,and potential trouble zones, BHGE recommended the MAX-BRIDGE™ advanced bridging solution to mitigate the challenges.

The MAX-BRIDGE customized bridging package meets multiple challenges in wells where a fine line exists between wellbore stability, differential sticking, and mud losses.

The MAX-BRIDGE system comprises a patented deformable sealing polymer in conjunction with highly resilient graphite additives to reduce pore pressure transmission and seal and plug microfractures in shale and low-porosity sands.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Reduce losses in highly depleted shale formation
  • Improve wellbore instability
  • Provide an alternative to conventional polymer system

Results

  • Increased ROP
  • Eliminated downhole losses
  • Improved hole cleaning
  • Enabled use of rotary steerable system due to improved wellbore stability
  • Reduced overall drilling NPT and casing requirements