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Oil reserves in salt caverns

  • Published
    5th Jun, 2023

Recently, a Government-owned engineering consultancy firm Engineers India (EIL) is studying the prospects and feasibility of developing salt cavern-based strategic oil reserves in Rajasthan, in line with the government’s objective of increasing the country’s strategic oil storage capacity.

India’s Strategic Oil reserves:

  • A strategic reserve is the reserve of a commodity or items that is held back from normal use by governments, in pursuance of a particular strategy or to cope with unexpected events.
  • Countries keep strategic reserves of crude oil to meet the immediate demand in times of crisis or unexpected events.
  • India, the world’s third-largest consumer of crude, depends on imports for more than 85% of its requirement.
  • Government of India through Indian Strategic Petroleum Reserve Ltd. (ISPRL) under Phase–1 has setup Strategic Petroleum Reserves (SPR) at three locations with a capacity of 5.33 MMT (million metric ton) –
    • Vishakhapatnam (1.33 MMT),
    • Mangaluru (1.50 MMT) and
    • Padur (2.5 MMT)

About Salt Cavern-based oil reserves:
  • Underground storage caverns are used to store very large quantities of unrefined petroleum and natural gas.
  • These underground caverns are cavities that have been “mined” out of naturally occurring salt domes.
  • Approximately 7% of total underground natural gas storage capacity is in Salt Caverns.
  • Salt caverns are developed by the process of solution mining, which involves pumping water into geological formations with large salt deposits to dissolve the salt.

Salt Cavern-based Storage v/s Rock Cavern-based Storage:

  • Rock caverns are large man-made spaces in the rock and are considered the safest means of storing hydrocarbons.
  • In comparison to rock caverns, salt caverns are considered cheaper and less labour- and cost-intensive.
  • Salt cavern-based oil storage facilities are also naturally well-sealed, and engineered for rapid injection and extraction of oil.
  • This makes them a more attractive option than storing oil in other geological formations.
  • The entire strategic petroleum reserve programme of the United States has so far been based on salt cavern-based storage facilities.
  • In comparison, India’s all 3 strategic petroleum reserves are made up of excavated rock caverns.

India’s Potential:

  • Rajasthan, which has the bulk of requisite salt formations in India, is seen as the most conducive for developing salt cavern-based strategic storage facilities.
  • A refinery is coming up in Barmer, and Rajasthan has crude pipelines as well; such infrastructure is conducive for building strategic oil reserves.
  • However, no Indian company, including EIL, had the requisite technical know-how to build salt cavern-based strategic hydrocarbon storage.
  • This gap in access to technology has been bridged by EIL’s recent partnership with Germany’s DEEP.KBB GmbH — a company that specialises in cavern storage and solution mining technology.
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