Cementing Underground Gas Storage Wells

Well integrity in UGS wells

Long-term zonal isolation is critical to the success of underground gas storage (UGS) wells. UGS wells are often close to urban areas, where strict environmental regulations require leak-free wells. Over a 2-year period, Schlumberger has successfully completed more than 10 UGS wells in Europe using advanced cementing technologies that protect against loss of well integrity.

Effective zonal isolation

UGS well cement sheath damage caused by changes in temperature and pressure—and other factors—can allow hydrocarbons to migrate to the surface. Increased sustained casing pressure (SCP) and unwanted gas migration can be dangerous and expose owners to fines and other penalties. Effective zonal isolation is critical to ensure efficiency and environmental protection with UGS wells. Our technology includes products designed to minimize the risk of leaks from UGS wells.

• Completed cementing operations in Totea Field in Romania 
  Achieved good bonding across gas intervals with no surface leaks detected.
• Maintained long-term zonal isolation in UGS wells in Italy 
  Contained leaks to protect the environment and the investment made in gas storage.
• Reduced the risk of service interruption with UGS wells in urban Italy
  Eliminated the costs related to remedial cementing operations and lost inventory.
• Drilled and completed leak-free UGS well in Berlin
  Combined cementing technologies to effectively seal the well.

Optimized cement systems for UGS wells

Schlumberger offers advanced cementing technologies to reduce the risk of unwanted gas migration. The following technologies can be used separately or together for an integrated solution.

• FUTUR Self-Healing Cement self-heals from the time it is placed until the end of the well’s operational life and into abandonment.
• FlexSTONE Advanced Flexible Cement withstands pressure and temperature fluctuations during injection and production phases.
• CemNET Advanced Fiber Cement helps improve cement returns by controlling lost circulation.

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